From 495b54aa8c118dea299c6d4561c0c73829262221 Mon Sep 17 00:00:00 2001
From: Gabriel Lima <gabrielmartinslima@gmail.com>
Date: Sat, 21 May 2022 16:52:49 -0300
Subject: [PATCH] Sawtooth wave on left channel

---
 .cproject                            |   4 +-
 .settings/language.settings.xml      |   4 +-
 .settings/stm32cubeide.project.prefs |   2 +-
 Core/Inc/stm32f4xx_it.h              |   1 +
 Core/Src/Components/AUDIO.c          | 691 +++++++++++++++++++++++++++
 Core/Src/Components/AUDIO.h          | 174 +++++++
 Core/Src/Components/AUDIO_LINK.c     | 267 +++++++++++
 Core/Src/Components/AUDIO_LINK.h     | 114 +++++
 Core/Src/Components/Start.cpp        |  14 +-
 Core/Src/Components/cs43l22.c        | 493 +++++++++++++++++++
 Core/Src/Components/cs43l22.h        | 228 +++++++++
 Core/Src/main.c                      |  35 +-
 Core/Src/stm32f4xx_hal_msp.c         |  25 +
 Core/Src/stm32f4xx_it.c              |  15 +
 F411-DMA-Audio Debug.launch          |  80 ++++
 F411-DMA-Audio.ioc                   |  60 ++-
 16 files changed, 2171 insertions(+), 36 deletions(-)
 create mode 100644 Core/Src/Components/AUDIO.c
 create mode 100644 Core/Src/Components/AUDIO.h
 create mode 100644 Core/Src/Components/AUDIO_LINK.c
 create mode 100644 Core/Src/Components/AUDIO_LINK.h
 create mode 100644 Core/Src/Components/cs43l22.c
 create mode 100644 Core/Src/Components/cs43l22.h
 create mode 100644 F411-DMA-Audio Debug.launch

diff --git a/.cproject b/.cproject
index 1412dcc..ef9c13c 100644
--- a/.cproject
+++ b/.cproject
@@ -23,7 +23,7 @@
 							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.1794174173" name="Floating-point unit" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu" useByScannerDiscovery="true" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.value.fpv4-sp-d16" valueType="enumerated"/>
 							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.369857510" name="Floating-point ABI" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi" useByScannerDiscovery="true" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.value.hard" valueType="enumerated"/>
 							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board.1721672077" name="Board" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board" useByScannerDiscovery="false" value="STM32F411E-DISCO" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.1992663669" name="Defaults" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" useByScannerDiscovery="false" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.5 || Debug || true || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.option.toolchain.value.workspace || STM32F411E-DISCO || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../Drivers/CMSIS/Include | ../Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../FATFS/Target | ../FATFS/App | ../USB_DEVICE/App | ../USB_DEVICE/Target | ../Middlewares/Third_Party/FatFs/src | ../Middlewares/ST/STM32_USB_Device_Library/Core/Inc | ../Middlewares/ST/STM32_USB_Device_Library/Class/AUDIO/Inc ||  ||  || USE_HAL_DRIVER | STM32F411xE ||  || Drivers | Core/Startup | Middlewares | Core | FATFS | USB_DEVICE ||  ||  || ${workspace_loc:/${ProjName}/STM32F411VETX_FLASH.ld} || true || NonSecure ||  || secure_nsclib.o ||  || None || " valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.1992663669" name="Defaults" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" useByScannerDiscovery="false" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.5 || Debug || true || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.option.toolchain.value.workspace || STM32F411E-DISCO || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../FATFS/App | ../USB_DEVICE/Target | ../Drivers/CMSIS/Include | ../Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../USB_DEVICE/App | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../FATFS/Target | ../Middlewares/ST/STM32_USB_Device_Library/Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../Middlewares/Third_Party/FatFs/src | ../Middlewares/ST/STM32_USB_Device_Library/Class/AUDIO/Inc ||  ||  || USE_HAL_DRIVER | STM32F411xE ||  || Drivers | Core/Startup | Middlewares | Core | FATFS | USB_DEVICE ||  ||  || ${workspace_loc:/${ProjName}/STM32F411VETX_FLASH.ld} || true || NonSecure ||  || secure_nsclib.o ||  || None || " valueType="string"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform.975091300" isAbstract="false" osList="all" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform"/>
 							<builder buildPath="${workspace_loc:/F411-DMA-Audio}/Debug" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder.1669640011" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder"/>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.1364992464" name="MCU GCC Assembler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler">
@@ -132,7 +132,7 @@
 							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.1475300684" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu" useByScannerDiscovery="true" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.fpu.value.fpv4-sp-d16" valueType="enumerated"/>
 							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.1239165760" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi" useByScannerDiscovery="true" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.floatabi.value.hard" valueType="enumerated"/>
 							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board.492356982" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.target_board" useByScannerDiscovery="false" value="STM32F411E-DISCO" valueType="string"/>
-							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.1474171759" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" useByScannerDiscovery="false" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.5 || Release || false || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.option.toolchain.value.workspace || STM32F411E-DISCO || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../Drivers/CMSIS/Include | ../Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../FATFS/Target | ../FATFS/App | ../USB_DEVICE/App | ../USB_DEVICE/Target | ../Middlewares/Third_Party/FatFs/src | ../Middlewares/ST/STM32_USB_Device_Library/Core/Inc | ../Middlewares/ST/STM32_USB_Device_Library/Class/AUDIO/Inc ||  ||  || USE_HAL_DRIVER | STM32F411xE ||  || Drivers | Core/Startup | Middlewares | Core | FATFS | USB_DEVICE ||  ||  || ${workspace_loc:/${ProjName}/STM32F411VETX_FLASH.ld} || true || NonSecure ||  || secure_nsclib.o ||  || None || " valueType="string"/>
+							<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults.1474171759" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.option.defaults" useByScannerDiscovery="false" value="com.st.stm32cube.ide.common.services.build.inputs.revA.1.0.5 || Release || false || Executable || com.st.stm32cube.ide.mcu.gnu.managedbuild.option.toolchain.value.workspace || STM32F411E-DISCO || 0 || 0 || arm-none-eabi- || ${gnu_tools_for_stm32_compiler_path} || ../FATFS/App | ../USB_DEVICE/Target | ../Drivers/CMSIS/Include | ../Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc | ../USB_DEVICE/App | ../Drivers/CMSIS/Device/ST/STM32F4xx/Include | ../FATFS/Target | ../Middlewares/ST/STM32_USB_Device_Library/Core/Inc | ../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy | ../Middlewares/Third_Party/FatFs/src | ../Middlewares/ST/STM32_USB_Device_Library/Class/AUDIO/Inc ||  ||  || USE_HAL_DRIVER | STM32F411xE ||  || Drivers | Core/Startup | Middlewares | Core | FATFS | USB_DEVICE ||  ||  || ${workspace_loc:/${ProjName}/STM32F411VETX_FLASH.ld} || true || NonSecure ||  || secure_nsclib.o ||  || None || " valueType="string"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform.195172514" isAbstract="false" osList="all" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.targetplatform"/>
 							<builder buildPath="${workspace_loc:/F411-DMA-Audio}/Release" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder.1978478044" managedBuildOn="true" name="Gnu Make Builder.Release" parallelBuildOn="true" parallelizationNumber="optimal" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.builder"/>
 							<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler.1392129692" name="MCU GCC Assembler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.assembler">
diff --git a/.settings/language.settings.xml b/.settings/language.settings.xml
index 9b39483..5bc2f65 100644
--- a/.settings/language.settings.xml
+++ b/.settings/language.settings.xml
@@ -6,7 +6,7 @@
 			<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
 			<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
 			<provider copy-of="extension" id="org.eclipse.cdt.managedbuilder.core.GCCBuildCommandParser"/>
-			<provider class="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" console="false" env-hash="141237957491136193" id="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" keep-relative-paths="false" name="MCU ARM GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
+			<provider class="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" console="false" env-hash="-321882623712562213" id="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" keep-relative-paths="false" name="MCU ARM GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
 				<language-scope id="org.eclipse.cdt.core.gcc"/>
 				<language-scope id="org.eclipse.cdt.core.g++"/>
 			</provider>
@@ -18,7 +18,7 @@
 			<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
 			<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
 			<provider copy-of="extension" id="org.eclipse.cdt.managedbuilder.core.GCCBuildCommandParser"/>
-			<provider class="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" console="false" env-hash="141237957491136193" id="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" keep-relative-paths="false" name="MCU ARM GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
+			<provider class="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" console="false" env-hash="-321882623712562213" id="com.st.stm32cube.ide.mcu.toolchain.armnone.setup.CrossBuiltinSpecsDetector" keep-relative-paths="false" name="MCU ARM GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
 				<language-scope id="org.eclipse.cdt.core.gcc"/>
 				<language-scope id="org.eclipse.cdt.core.g++"/>
 			</provider>
diff --git a/.settings/stm32cubeide.project.prefs b/.settings/stm32cubeide.project.prefs
index 2f51fb5..9631d28 100644
--- a/.settings/stm32cubeide.project.prefs
+++ b/.settings/stm32cubeide.project.prefs
@@ -1,5 +1,5 @@
 635E684B79701B039C64EA45C3F84D30=786B3C9175F8FD59BE24144A9C2C0972
 66BE74F758C12D739921AEA421D593D3=0
-8DF89ED150041C4CBC7CB9A9CAA90856=A7836624F0B1F62198526376ABF87601
+8DF89ED150041C4CBC7CB9A9CAA90856=AB300AAF2E04A330B7C06C41BF25F205
 DC22A860405A8BF2F2C095E5B6529F12=AB300AAF2E04A330B7C06C41BF25F205
 eclipse.preferences.version=1
diff --git a/Core/Inc/stm32f4xx_it.h b/Core/Inc/stm32f4xx_it.h
index e5c6f7c..34939c5 100644
--- a/Core/Inc/stm32f4xx_it.h
+++ b/Core/Inc/stm32f4xx_it.h
@@ -55,6 +55,7 @@ void SVC_Handler(void);
 void DebugMon_Handler(void);
 void PendSV_Handler(void);
 void SysTick_Handler(void);
+void DMA1_Stream5_IRQHandler(void);
 void OTG_FS_IRQHandler(void);
 /* USER CODE BEGIN EFP */
 
diff --git a/Core/Src/Components/AUDIO.c b/Core/Src/Components/AUDIO.c
new file mode 100644
index 0000000..259c114
--- /dev/null
+++ b/Core/Src/Components/AUDIO.c
@@ -0,0 +1,691 @@
+/**
+  ******************************************************************************
+  * @file    stm32f411e_discovery_audio.c
+  * @author  MCD Application Team
+  * @brief   This file provides the Audio driver for the STM32F411E-Discovery 
+  *          board.  
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */ 
+
+/*==============================================================================
+                                             User NOTES
+1. How To use this driver:
+--------------------------
+   - This driver supports STM32F411xx devices on STM32F411E-Discovery Kit:
+        a) to play an audio file (all functions names start by BSP_AUDIO_OUT_xxx)
+        b) to record an audio file through MP45DT02, ST MEMS (all functions names start by AUDIO_IN_xxx)
+
+a) PLAY A FILE:
+==============
+   + Call the function BSP_AUDIO_OUT_Init(
+                                    OutputDevice: physical output mode (OUTPUT_DEVICE_SPEAKER, 
+                                                 OUTPUT_DEVICE_HEADPHONE, OUTPUT_DEVICE_AUTO or 
+                                                 OUTPUT_DEVICE_BOTH)
+                                    Volume: initial volume to be set (0 is min (mute), 100 is max (100%)
+                                    AudioFreq: Audio frequency in Hz (8000, 16000, 22500, 32000 ...)
+                                    this parameter is relative to the audio file/stream type.
+                                   )
+      This function configures all the hardware required for the audio application (codec, I2C, I2S, 
+      GPIOs, DMA and interrupt if needed). This function returns 0 if configuration is OK.
+      If the returned value is different from 0 or the function is stuck then the communication with
+      the codec (try to un-plug the power or reset device in this case).
+      - OUTPUT_DEVICE_SPEAKER: only speaker will be set as output for the audio stream.
+      - OUTPUT_DEVICE_HEADPHONE: only headphones will be set as output for the audio stream.
+      - OUTPUT_DEVICE_AUTO: Selection of output device is made through external switch (implemented 
+         into the audio jack on the discovery board). When the Headphone is connected it is used
+         as output. When the headphone is disconnected from the audio jack, the output is
+         automatically switched to Speaker.
+      - OUTPUT_DEVICE_BOTH: both Speaker and Headphone are used as outputs for the audio stream
+         at the same time.
+   + Call the function BSP_AUDIO_OUT_Play(
+                                  pBuffer: pointer to the audio data file address
+                                  Size: size of the buffer to be sent in Bytes
+                                 )
+      to start playing (for the first time) from the audio file/stream.
+   + Call the function BSP_AUDIO_OUT_Pause() to pause playing 
+   + Call the function BSP_AUDIO_OUT_Resume() to resume playing.
+       Note. After calling BSP_AUDIO_OUT_Pause() function for pause, only BSP_AUDIO_OUT_Resume() should be called
+          for resume (it is not allowed to call BSP_AUDIO_OUT_Play() in this case).
+       Note. This function should be called only when the audio file is played or paused (not stopped).
+   + For each mode, you may need to implement the relative callback functions into your code.
+      The Callback functions are named BSP_AUDIO_OUT_XXXCallBack() and only their prototypes are declared in 
+      the stm32f411e_discovery_audio.h file. (refer to the example for more details on the callbacks implementations)
+   + To Stop playing, to modify the volume level, the frequency or to mute, use the functions
+       BSP_AUDIO_OUT_Stop(), BSP_AUDIO_OUT_SetVolume(), AUDIO_OUT_SetFrequency() BSP_AUDIO_OUT_SetOutputMode and BSP_AUDIO_OUT_SetMute().
+   + The driver API and the callback functions are at the end of the stm32f411e_discovery_audio.h file.
+   
+Driver architecture:
+--------------------
+   + This driver provide the High Audio Layer: consists of the function API exported in the stm32f411e_discovery_audio.h file
+       (BSP_AUDIO_OUT_Init(), BSP_AUDIO_OUT_Play() ...)
+   + This driver provide also the Media Access Layer (MAL): which consists of functions allowing to access the media containing/
+       providing the audio file/stream. These functions are also included as local functions into
+       the stm32f411e_discovery_audio.c file (I2S3_Init()...)
+
+Known Limitations:
+-------------------
+   1- When using the Speaker, if the audio file quality is not high enough, the speaker output
+      may produce high and uncomfortable noise level. To avoid this issue, to use speaker
+      output properly, try to increase audio file sampling rate (typically higher than 48KHz).
+      This operation will lead to larger file size.
+   2- Communication with the audio codec (through I2C) may be corrupted if it is interrupted by some
+      user interrupt routines (in this case, interrupts could be disabled just before the start of 
+      communication then re-enabled when it is over). Note that this communication is only done at
+      the configuration phase (BSP_AUDIO_OUT_Init() or BSP_AUDIO_OUT_Stop()) and when Volume control modification is 
+      performed (BSP_AUDIO_OUT_SetVolume() or BSP_AUDIO_OUT_SetMute()or BSP_AUDIO_OUT_SetOutputMode()). 
+      When the audio data is played, no communication is required with the audio codec.
+   3- Parsing of audio file is not implemented (in order to determine audio file properties: Mono/Stereo, Data size, 
+      File size, Audio Frequency, Audio Data header size ...). The configuration is fixed for the given audio file.
+   4- Supports only Stereo audio streaming. To play mono audio streams, each data should be sent twice 
+      on the I2S or should be duplicated on the source buffer. Or convert the stream in stereo before playing.
+   5- Supports only 16-bits audio data size.
+
+b) RECORD A FILE:
+================
+   + Call the function BSP_AUDIO_IN_Init(
+                                    AudioFreq: Audio frequency in Hz (8000, 16000, 22500, 32000 ...)
+                                    )
+      This function configures all the hardware required for the audio application (I2S, 
+      GPIOs, DMA and interrupt if needed). This function returns 0 if configuration is OK.
+
+   + Call the function BSP_AUDIO_IN_Record(
+                            pbuf Main buffer pointer for the recorded data storing  
+                            size Current size of the recorded buffer
+                            )
+      to start recording from the microphone.
+
+   + User needs to implement user callbacks to retrieve data saved in the record buffer
+      (AUDIO_IN_RxHalfCpltCallback/BSP_AUDIO_IN_ReceiveComplete_CallBack)
+
+   + Call the function AUDIO_IN_STOP() to stop recording 
+
+==============================================================================*/
+
+
+/**
+  ***************************************************************************************************************
+  ***************************************************************************************************************
+  ***************************************************************************************************************
+
+  File:		  AUDIO.c
+  Modifier:   ControllersTech.com
+  Updated:    10th JAN 2021
+
+  ***************************************************************************************************************
+  Copyright (C) 2017 ControllersTech.com
+
+  This is a free software under the GNU license, you can redistribute it and/or modify it under the terms
+  of the GNU General Public License version 3 as published by the Free Software Foundation.
+  This software library is shared with public for educational purposes, without WARRANTY and Author is not liable for any damages caused directly
+  or indirectly by this software, read more about this on the GNU General Public License.
+
+  ***************************************************************************************************************
+*/
+
+/* Includes ------------------------------------------------------------------*/
+#include "AUDIO.h"
+
+/* These PLL parameters are valid when the f(VCO clock) = 1Mhz */
+const uint32_t I2SFreq[8] = {8000, 11025, 16000, 22050, 32000, 44100, 48000, 96000};
+const uint32_t I2SPLLN[8] = {256, 429, 213, 429, 426, 271, 258, 344};
+const uint32_t I2SPLLR[8] = {5, 4, 4, 4, 4, 6, 3, 1};
+
+/*##### PLAY #####*/
+static AUDIO_DrvTypeDef           *pAudioDrv;
+I2S_HandleTypeDef                 hAudioOutI2s;
+
+static uint8_t I2S3_Init(uint32_t AudioFreq);
+extern AUDIO_DrvTypeDef cs43l22_drv;
+
+
+/**
+  * @brief  Configures the audio peripherals.
+  * @param  OutputDevice: OUTPUT_DEVICE_SPEAKER, OUTPUT_DEVICE_HEADPHONE,
+  *                       OUTPUT_DEVICE_BOTH or OUTPUT_DEVICE_AUTO .
+  * @param  Volume: Initial volume level (from 0 (Mute) to 100 (Max))
+  * @param  AudioFreq: Audio frequency used to play the audio stream.
+  * @retval AUDIO_OK if correct communication, else wrong communication
+  */
+uint8_t AUDIO_OUT_Init(uint16_t OutputDevice, uint8_t Volume, uint32_t AudioFreq)
+{    
+  uint8_t ret = AUDIO_OK;
+  
+  /* PLL clock is set depending by the AudioFreq (44.1khz vs 48khz groups) */ 
+  AUDIO_OUT_ClockConfig(&hAudioOutI2s, AudioFreq, NULL);
+  
+  /* I2S data transfer preparation:
+  Prepare the Media to be used for the audio transfer from memory to I2S peripheral */
+  hAudioOutI2s.Instance = I2S3;
+  if(HAL_I2S_GetState(&hAudioOutI2s) == HAL_I2S_STATE_RESET)
+  {
+    /* Init the I2S MSP: this __weak function can be redefined by the application*/
+    AUDIO_OUT_MspInit(&hAudioOutI2s, NULL);
+  }
+
+  /* I2S data transfer preparation:
+  Prepare the Media to be used for the audio transfer from memory to I2S peripheral */
+  /* Configure the I2S peripheral */
+  if(I2S3_Init(AudioFreq) != AUDIO_OK)
+  {
+    ret = AUDIO_ERROR;
+  }
+
+  if(ret == AUDIO_OK)
+  {
+    /* Retieve audio codec identifier */
+    if(((cs43l22_drv.ReadID(AUDIO_I2C_ADDRESS)) & CS43L22_ID_MASK) == CS43L22_ID)
+    {  
+      /* Initialize the audio driver structure */
+      pAudioDrv = &cs43l22_drv; 
+    }
+    else
+    {
+      ret = AUDIO_ERROR;
+    }
+  }
+  
+  if(ret == AUDIO_OK)
+  {
+    pAudioDrv->Init(AUDIO_I2C_ADDRESS, OutputDevice, Volume, AudioFreq);
+  }
+  
+  return ret;
+}
+
+/**
+  * @brief  Starts playing audio stream from a data buffer for a determined size. 
+  * @param  pBuffer: Pointer to the buffer 
+  * @param  Size: Number of audio data BYTES.
+  * @retval AUDIO_OK if correct communication, else wrong communication
+  */
+uint8_t AUDIO_OUT_Play(uint16_t* pBuffer, uint32_t Size)
+{
+  /* Call the audio Codec Play function */
+  if(pAudioDrv->Play(AUDIO_I2C_ADDRESS, pBuffer, Size) != 0)
+  {
+    return AUDIO_ERROR;
+  }
+  else 
+  {
+    /* Update the Media layer and enable it for play */  
+    HAL_I2S_Transmit_DMA(&hAudioOutI2s, pBuffer, DMA_MAX(Size/AUDIODATA_SIZE)); 
+    
+    /* Return AUDIO_OK when all operations are correctly done */
+    return AUDIO_OK;
+  }
+}
+
+/**
+  * @brief  Sends n-Bytes on the I2S interface.
+  * @param  pData: Pointer to data address 
+  * @param  Size: Number of data to be written
+  */
+void AUDIO_OUT_ChangeBuffer(uint16_t *pData, uint16_t Size)
+{
+  HAL_I2S_Transmit_DMA(&hAudioOutI2s, pData, Size); 
+}
+
+/**
+  * @brief   Pauses the audio file stream. In case of using DMA, the DMA Pause
+  *          feature is used.
+  * WARNING: When calling BSP_AUDIO_OUT_Pause() function for pause, only the
+  *          BSP_AUDIO_OUT_Resume() function should be called for resume (use of BSP_AUDIO_OUT_Play() 
+  *          function for resume could lead to unexpected behavior).
+  * @retval  AUDIO_OK if correct communication, else wrong communication
+  */
+uint8_t AUDIO_OUT_Pause(void)
+{    
+  /* Call the Audio Codec Pause/Resume function */
+  if(pAudioDrv->Pause(AUDIO_I2C_ADDRESS) != 0)
+  {
+    return AUDIO_ERROR;
+  }
+  else
+  {
+    /* Call the Media layer pause function */
+    HAL_I2S_DMAPause(&hAudioOutI2s);
+    
+    /* Return AUDIO_OK when all operations are correctly done */
+    return AUDIO_OK;
+  }
+}
+
+/**
+  * @brief   Resumes the audio file streaming.  
+  * WARNING: When calling BSP_AUDIO_OUT_Pause() function for pause, only
+  *          BSP_AUDIO_OUT_Resume() function should be called for resume (use of BSP_AUDIO_OUT_Play() 
+  *          function for resume could lead to unexpected behavior).
+  * @retval  AUDIO_OK if correct communication, else wrong communication
+  */
+uint8_t AUDIO_OUT_Resume(void)
+{    
+  /* Call the Audio Codec Pause/Resume function */
+  if(pAudioDrv->Resume(AUDIO_I2C_ADDRESS) != 0)
+  {
+    return AUDIO_ERROR;
+  }
+  else
+  {
+    /* Call the Media layer resume function */
+    HAL_I2S_DMAResume(&hAudioOutI2s);
+    
+    /* Return AUDIO_OK when all operations are correctly done */
+    return AUDIO_OK;
+  }
+}
+
+/**
+  * @brief  Stops audio playing and Power down the Audio Codec. 
+  * @param  Option: could be one of the following parameters 
+  *           - CODEC_PDWN_HW: completely shut down the codec (physically). 
+  *                            Then need to reconfigure the Codec after power on.  
+  * @retval AUDIO_OK if correct communication, else wrong communication
+  */
+uint8_t AUDIO_OUT_Stop(uint32_t Option)
+{
+  /* Call DMA Stop to disable DMA stream before stopping codec */
+  HAL_I2S_DMAStop(&hAudioOutI2s);
+  
+  /* Call Audio Codec Stop function */
+  if(pAudioDrv->Stop(AUDIO_I2C_ADDRESS, Option) != 0)
+  {
+    return AUDIO_ERROR;
+  }
+  else
+  {
+    if(Option == CODEC_PDWN_HW)
+    { 
+      /* Wait at least 1ms */
+      HAL_Delay(1);
+      
+      /* Reset the pin */
+      HAL_GPIO_WritePin(AUDIO_RESET_GPIO, AUDIO_RESET_PIN, GPIO_PIN_RESET);
+    }
+    
+    /* Return AUDIO_OK when all operations are correctly done */
+    return AUDIO_OK;
+  }
+}
+
+/**
+  * @brief  Controls the current audio volume level. 
+  * @param  Volume: Volume level to be set in percentage from 0% to 100% (0 for 
+  *         Mute and 100 for Max volume level).
+  * @retval AUDIO_OK if correct communication, else wrong communication
+  */
+uint8_t AUDIO_OUT_SetVolume(uint8_t Volume)
+{
+  /* Call the codec volume control function with converted volume value */
+  if(pAudioDrv->SetVolume(AUDIO_I2C_ADDRESS, Volume) != 0)
+  {
+    return AUDIO_ERROR;
+  }
+  else
+  {
+    /* Return AUDIO_OK when all operations are correctly done */
+    return AUDIO_OK;
+  }
+}
+
+/**
+  * @brief  Enables or disables the MUTE mode by software 
+  * @param  Cmd: could be AUDIO_MUTE_ON to mute sound or AUDIO_MUTE_OFF to 
+  *         unmute the codec and restore previous volume level.
+  * @retval AUDIO_OK if correct communication, else wrong communication
+  */
+uint8_t AUDIO_OUT_SetMute(uint32_t Cmd)
+{ 
+  /* Call the Codec Mute function */
+  if(pAudioDrv->SetMute(AUDIO_I2C_ADDRESS, Cmd) != 0)
+  {
+    return AUDIO_ERROR;
+  }
+  else
+  {
+    /* Return AUDIO_OK when all operations are correctly done */
+    return AUDIO_OK;
+  }
+}
+
+/**
+  * @brief  Switch dynamically (while audio file is played) the output target 
+  *         (speaker or headphone).
+  * @note   This function modifies a global variable of the audio codec driver: OutputDev.
+  * @param  Output: specifies the audio output target: OUTPUT_DEVICE_SPEAKER,
+  *         OUTPUT_DEVICE_HEADPHONE, OUTPUT_DEVICE_BOTH or OUTPUT_DEVICE_AUTO 
+  * @retval AUDIO_OK if correct communication, else wrong communication
+  */
+uint8_t AUDIO_OUT_SetOutputMode(uint8_t Output)
+{
+  /* Call the Codec output Device function */
+  if(pAudioDrv->SetOutputMode(AUDIO_I2C_ADDRESS, Output) != 0)
+  {
+    return AUDIO_ERROR;
+  }
+  else
+  {
+    /* Return AUDIO_OK when all operations are correctly done */
+    return AUDIO_OK;
+  }
+}
+
+/**
+  * @brief  Update the audio frequency.
+  * @param  AudioFreq: Audio frequency used to play the audio stream.
+  * @note   This API should be called after the BSP_AUDIO_OUT_Init() to adjust the
+  *         audio frequency. 
+  */
+void AUDIO_OUT_SetFrequency(uint32_t AudioFreq)
+{ 
+  RCC_PeriphCLKInitTypeDef rccclkinit;
+  
+  /* Enable PLLI2S clock */
+  HAL_RCCEx_GetPeriphCLKConfig(&rccclkinit);
+  /* PLLI2S_VCO Input = HSE_VALUE/PLL_M = 1 Mhz */
+  if ((AudioFreq & 0x7) == 0)
+  {
+    /* Audio frequency multiple of 8 (8/16/32/48/96/192) */
+    /* PLLI2S_VCO Output = PLLI2S_VCO Input * PLLI2SN = 192 Mhz */
+    /* I2SCLK = PLLI2S_VCO Output/PLLI2SR = 192/6 = 32 Mhz */
+    rccclkinit.PeriphClockSelection = RCC_PERIPHCLK_I2S;
+    rccclkinit.PLLI2S.PLLI2SN = 192;
+    rccclkinit.PLLI2S.PLLI2SR = 6;
+    HAL_RCCEx_PeriphCLKConfig(&rccclkinit);
+  }
+  else
+  {
+    /* Other Frequency (11.025/22.500/44.100) */
+    /* PLLI2S_VCO Output = PLLI2S_VCO Input * PLLI2SN = 290 Mhz */
+    /* I2SCLK = PLLI2S_VCO Output/PLLI2SR = 290/2 = 145 Mhz */
+    rccclkinit.PeriphClockSelection = RCC_PERIPHCLK_I2S;
+    rccclkinit.PLLI2S.PLLI2SN = 290;
+    rccclkinit.PLLI2S.PLLI2SR = 2;
+    HAL_RCCEx_PeriphCLKConfig(&rccclkinit);
+  }
+  
+  /* Update the I2S audio frequency configuration */
+  I2S3_Init(AudioFreq);
+}
+
+/**
+  * @brief  Tx Transfer completed callbacks.
+  * @param  hi2s: I2S handle
+  */
+void HAL_I2S_TxCpltCallback(I2S_HandleTypeDef *hi2s)
+{
+  if(hi2s->Instance == I2S3)
+  {
+    /* Call the user function which will manage directly transfer complete */  
+    AUDIO_OUT_TransferComplete_CallBack();
+  }
+}
+
+/**
+  * @brief  Tx Half Transfer completed callbacks.
+  * @param  hi2s: I2S handle
+  */
+void HAL_I2S_TxHalfCpltCallback(I2S_HandleTypeDef *hi2s)
+{
+  if(hi2s->Instance == I2S3)
+  {
+    /* Manage the remaining file size and new address offset: This function should
+       be coded by user (its prototype is already declared in stm32f4_discovery_audio.h) */  
+    AUDIO_OUT_HalfTransfer_CallBack();
+  }
+}
+
+/**
+  * @brief  Clock Config.
+  * @param  hi2s: might be required to set audio peripheral predivider if any.
+  * @param  AudioFreq: Audio frequency used to play the audio stream.
+  * @note   This API is called by BSP_AUDIO_OUT_Init() and BSP_AUDIO_OUT_SetFrequency()
+  *         Being __weak it can be overwritten by the application     
+  * @param  Params : pointer on additional configuration parameters, can be NULL.
+  */
+__weak void AUDIO_OUT_ClockConfig(I2S_HandleTypeDef *hi2s, uint32_t AudioFreq, void *Params)
+{ 
+  RCC_PeriphCLKInitTypeDef rccclkinit;
+  uint8_t index = 0, freqindex = 0xFF;
+  
+  for(index = 0; index < 8; index++)
+  {
+    if(I2SFreq[index] == AudioFreq)
+    {
+      freqindex = index;
+    }
+  }
+  /* Enable PLLI2S clock */
+  HAL_RCCEx_GetPeriphCLKConfig(&rccclkinit);
+  /* PLLI2S_VCO Input = HSE_VALUE/PLL_M = 1 Mhz */
+  if ((freqindex & 0x7) == 0)
+  {
+    /* I2S clock config 
+    PLLI2S_VCO = f(VCO clock) = f(PLLI2S clock input) � (PLLI2SN/PLLM)
+    I2SCLK = f(PLLI2S clock output) = f(VCO clock) / PLLI2SR */
+    rccclkinit.PeriphClockSelection = RCC_PERIPHCLK_I2S;
+    rccclkinit.PLLI2S.PLLI2SM = 8;
+    rccclkinit.PLLI2S.PLLI2SN = I2SPLLN[freqindex];
+    rccclkinit.PLLI2S.PLLI2SR = I2SPLLR[freqindex];
+    HAL_RCCEx_PeriphCLKConfig(&rccclkinit);
+  }
+  else 
+  {
+    /* I2S clock config 
+    PLLI2S_VCO = f(VCO clock) = f(PLLI2S clock input) � (PLLI2SN/PLLM)
+    I2SCLK = f(PLLI2S clock output) = f(VCO clock) / PLLI2SR */
+    rccclkinit.PeriphClockSelection = RCC_PERIPHCLK_I2S;
+    rccclkinit.PLLI2S.PLLI2SM = 8;
+    rccclkinit.PLLI2S.PLLI2SN = 258;
+    rccclkinit.PLLI2S.PLLI2SR = 3;
+    HAL_RCCEx_PeriphCLKConfig(&rccclkinit);
+  }
+}
+
+/**
+  * @brief  AUDIO OUT I2S MSP Init.
+  * @param  hi2s: might be required to set audio peripheral predivider if any.
+  * @param  Params : pointer on additional configuration parameters, can be NULL.
+  */
+__weak void AUDIO_OUT_MspInit(I2S_HandleTypeDef *hi2s, void *Params)
+{
+  static DMA_HandleTypeDef hdma_i2sTx;
+  GPIO_InitTypeDef  GPIO_InitStruct;
+
+  /* Enable I2S3 clock */
+  I2S3_CLK_ENABLE();
+
+  /*** Configure the GPIOs ***/  
+  /* Enable I2S GPIO clocks */
+  I2S3_SCK_SD_CLK_ENABLE();
+  I2S3_WS_CLK_ENABLE();
+
+  /* I2S3 pins configuration: WS, SCK and SD pins ----------------------------*/
+  GPIO_InitStruct.Pin         = I2S3_SCK_PIN | I2S3_SD_PIN; 
+  GPIO_InitStruct.Mode        = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull        = GPIO_NOPULL;
+  GPIO_InitStruct.Speed       = GPIO_SPEED_FAST;
+  GPIO_InitStruct.Alternate   = I2S3_SCK_SD_WS_AF;
+  HAL_GPIO_Init(I2S3_SCK_SD_GPIO_PORT, &GPIO_InitStruct);
+  
+  GPIO_InitStruct.Pin         = I2S3_WS_PIN ;
+  HAL_GPIO_Init(I2S3_WS_GPIO_PORT, &GPIO_InitStruct); 
+
+  /* I2S3 pins configuration: MCK pin */
+  I2S3_MCK_CLK_ENABLE();
+  GPIO_InitStruct.Pin         = I2S3_MCK_PIN; 
+  HAL_GPIO_Init(I2S3_MCK_GPIO_PORT, &GPIO_InitStruct);   
+
+  /* Enable the I2S DMA clock */
+  I2S3_DMAx_CLK_ENABLE(); 
+  
+  if(hi2s->Instance == I2S3)
+  {
+    /* Configure the hdma_i2sTx handle parameters */   
+    hdma_i2sTx.Init.Channel             = I2S3_DMAx_CHANNEL;  
+    hdma_i2sTx.Init.Direction           = DMA_MEMORY_TO_PERIPH;
+    hdma_i2sTx.Init.PeriphInc           = DMA_PINC_DISABLE;
+    hdma_i2sTx.Init.MemInc              = DMA_MINC_ENABLE;
+    hdma_i2sTx.Init.PeriphDataAlignment = I2S3_DMAx_PERIPH_DATA_SIZE;
+    hdma_i2sTx.Init.MemDataAlignment    = I2S3_DMAx_MEM_DATA_SIZE;
+    hdma_i2sTx.Init.Mode                = DMA_NORMAL;
+    hdma_i2sTx.Init.Priority            = DMA_PRIORITY_HIGH;
+    hdma_i2sTx.Init.FIFOMode            = DMA_FIFOMODE_ENABLE;         
+    hdma_i2sTx.Init.FIFOThreshold       = DMA_FIFO_THRESHOLD_FULL;
+    hdma_i2sTx.Init.MemBurst            = DMA_MBURST_SINGLE;
+    hdma_i2sTx.Init.PeriphBurst         = DMA_PBURST_SINGLE; 
+
+    hdma_i2sTx.Instance                 = I2S3_DMAx_STREAM;
+
+    /* Associate the DMA handle */
+    __HAL_LINKDMA(hi2s, hdmatx, hdma_i2sTx);
+    
+    /* Deinitialize the Stream for new transfer */
+    HAL_DMA_DeInit(&hdma_i2sTx);
+    
+    /* Configure the DMA Stream */
+    HAL_DMA_Init(&hdma_i2sTx);
+  }
+  
+  /* I2S DMA IRQ Channel configuration */
+  HAL_NVIC_SetPriority(I2S3_DMAx_IRQ, AUDIO_OUT_IRQ_PREPRIO, 0);
+  HAL_NVIC_EnableIRQ(I2S3_DMAx_IRQ);  
+}
+
+/**
+  * @brief  De-Initializes BSP_AUDIO_OUT MSP.
+  * @param  hi2s: might be required to set audio peripheral predivider if any.
+  * @param  Params : pointer on additional configuration parameters, can be NULL.
+  */
+__weak void AUDIO_OUT_MspDeInit(I2S_HandleTypeDef *hi2s, void *Params)
+{  
+  GPIO_InitTypeDef  GPIO_InitStruct;
+
+  /* I2S DMA IRQ Channel deactivation */
+  HAL_NVIC_DisableIRQ(I2S3_DMAx_IRQ); 
+  
+  if(hi2s->Instance == I2S3)
+  {
+    /* Deinitialize the Stream for new transfer */
+    HAL_DMA_DeInit(hi2s->hdmatx);
+  }
+
+ /* Disable I2S block */
+  __HAL_I2S_DISABLE(hi2s);
+
+  /* CODEC_I2S pins configuration: SCK and SD pins */
+  GPIO_InitStruct.Pin = I2S3_SCK_PIN | I2S3_SD_PIN;
+  HAL_GPIO_DeInit(I2S3_SCK_SD_GPIO_PORT, GPIO_InitStruct.Pin);
+  
+  /* CODEC_I2S pins configuration: WS pin */
+  GPIO_InitStruct.Pin = I2S3_WS_PIN;
+  HAL_GPIO_DeInit(I2S3_WS_GPIO_PORT, GPIO_InitStruct.Pin);
+  
+  /* CODEC_I2S pins configuration: MCK pin */
+  GPIO_InitStruct.Pin = I2S3_MCK_PIN;
+  HAL_GPIO_DeInit(I2S3_MCK_GPIO_PORT, GPIO_InitStruct.Pin); 
+
+  /* Disable I2S clock */
+  I2S3_CLK_DISABLE();
+
+  /* GPIO pins clock and DMA clock can be shut down in the applic 
+     by surcgarging this __weak function */   
+}
+
+/**
+  * @brief  Manages the DMA full Transfer complete event.
+  */
+__weak void AUDIO_OUT_TransferComplete_CallBack(void)
+{
+}
+
+/**
+  * @brief  Manages the DMA Half Transfer complete event.
+  */
+__weak void AUDIO_OUT_HalfTransfer_CallBack(void)
+{
+}
+
+/**
+  * @brief  Manages the DMA FIFO error event.
+  */
+__weak void AUDIO_OUT_Error_CallBack(void)
+{
+}
+
+/*******************************************************************************
+                            Static Functions
+*******************************************************************************/
+
+/**
+  * @brief  Initializes the Audio Codec audio interface (I2S).
+  * @param  AudioFreq: Audio frequency to be configured for the I2S peripheral. 
+  */
+static uint8_t I2S3_Init(uint32_t AudioFreq)
+{
+  /* Initialize the hAudioOutI2s Instance parameter */
+  hAudioOutI2s.Instance         = I2S3;
+  
+  /* Disable I2S block */
+  __HAL_I2S_DISABLE(&hAudioOutI2s);
+  
+  /* I2S3 peripheral configuration */
+  hAudioOutI2s.Init.AudioFreq   = AudioFreq;
+  hAudioOutI2s.Init.ClockSource = I2S_CLOCK_PLL;
+  hAudioOutI2s.Init.CPOL        = I2S_CPOL_LOW;
+  hAudioOutI2s.Init.DataFormat  = I2S_DATAFORMAT_16B;
+  hAudioOutI2s.Init.MCLKOutput  = I2S_MCLKOUTPUT_ENABLE;
+  hAudioOutI2s.Init.Mode        = I2S_MODE_MASTER_TX;
+  hAudioOutI2s.Init.Standard    = I2S_STANDARD;
+
+  /* Initialize the I2S peripheral with the structure above */
+  if(HAL_I2S_Init(&hAudioOutI2s) != HAL_OK)
+  {
+    return AUDIO_ERROR;
+  }
+  else
+  {
+    return AUDIO_OK;
+  }
+}
+/**
+  * @brief  I2S error callbacks.
+  * @param  hi2s: I2S handle
+  */
+void HAL_I2S_ErrorCallback(I2S_HandleTypeDef *hi2s)
+{
+  /* Manage the error generated on DMA FIFO: This function 
+     should be coded by user (its prototype is already declared in stm32f411e_discovery_audio.h) */ 
+  if(hi2s->Instance == I2S3)
+  {
+    AUDIO_OUT_Error_CallBack();
+  }
+}
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/Core/Src/Components/AUDIO.h b/Core/Src/Components/AUDIO.h
new file mode 100644
index 0000000..6bbf439
--- /dev/null
+++ b/Core/Src/Components/AUDIO.h
@@ -0,0 +1,174 @@
+/**
+  ******************************************************************************
+  * @file    stm32f411e_discovery_audio.h
+  * @author  MCD Application Team
+  * @brief   This file contains the common defines and functions prototypes for
+  *          stm32f411e_discovery_audio.c driver.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */ 
+
+/**
+  ***************************************************************************************************************
+  ***************************************************************************************************************
+  ***************************************************************************************************************
+
+  File:		  AUDIO.h
+  Modifier:   ControllersTech.com
+  Updated:    10th JAN 2021
+
+  ***************************************************************************************************************
+  Copyright (C) 2017 ControllersTech.com
+
+  This is a free software under the GNU license, you can redistribute it and/or modify it under the terms
+  of the GNU General Public License version 3 as published by the Free Software Foundation.
+  This software library is shared with public for educational purposes, without WARRANTY and Author is not liable for any damages caused directly
+  or indirectly by this software, read more about this on the GNU General Public License.
+
+  ***************************************************************************************************************
+*/
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __AUDIO_H
+#define __AUDIO_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif 
+
+
+#include "cs43l22.h"
+#include "AUDIO_LINK.h"
+//#include "pdm2pcm_glo.h"
+
+
+#define CODEC_STANDARD                0x04
+#define I2S_STANDARD                  I2S_STANDARD_PHILIPS
+
+
+ typedef struct
+ {
+   uint32_t  (*Init)(uint16_t, uint16_t, uint8_t, uint32_t);
+   void      (*DeInit)(void);
+   uint32_t  (*ReadID)(uint16_t);
+   uint32_t  (*Play)(uint16_t, uint16_t*, uint16_t);
+   uint32_t  (*Pause)(uint16_t);
+   uint32_t  (*Resume)(uint16_t);
+   uint32_t  (*Stop)(uint16_t, uint32_t);
+   uint32_t  (*SetFrequency)(uint16_t, uint32_t);
+   uint32_t  (*SetVolume)(uint16_t, uint8_t);
+   uint32_t  (*SetMute)(uint16_t, uint32_t);
+   uint32_t  (*SetOutputMode)(uint16_t, uint8_t);
+   uint32_t  (*Reset)(uint16_t);
+ }AUDIO_DrvTypeDef;
+
+/*------------------------------------------------------------------------------
+                          AUDIO OUT CONFIGURATION
+------------------------------------------------------------------------------*/
+
+/* I2S peripheral configuration defines */
+#define I2S3                            SPI3
+#define I2S3_CLK_ENABLE()               __HAL_RCC_SPI3_CLK_ENABLE()
+#define I2S3_CLK_DISABLE()              __HAL_RCC_SPI3_CLK_DISABLE()
+#define I2S3_SCK_SD_WS_AF               GPIO_AF6_SPI3
+#define I2S3_SCK_SD_CLK_ENABLE()        __HAL_RCC_GPIOC_CLK_ENABLE()
+#define I2S3_MCK_CLK_ENABLE()           __HAL_RCC_GPIOC_CLK_ENABLE()
+#define I2S3_WS_CLK_ENABLE()            __HAL_RCC_GPIOA_CLK_ENABLE()
+#define I2S3_WS_PIN                     GPIO_PIN_4
+#define I2S3_SCK_PIN                    GPIO_PIN_10
+#define I2S3_SD_PIN                     GPIO_PIN_12
+#define I2S3_MCK_PIN                    GPIO_PIN_7
+#define I2S3_SCK_SD_GPIO_PORT           GPIOC
+#define I2S3_WS_GPIO_PORT               GPIOA
+#define I2S3_MCK_GPIO_PORT              GPIOC
+
+/* I2S DMA Stream definitions */
+#define I2S3_DMAx_CLK_ENABLE()          __HAL_RCC_DMA1_CLK_ENABLE()
+#define I2S3_DMAx_CLK_DISABLE()         __HAL_RCC_DMA1_CLK_DISABLE()
+#define I2S3_DMAx_STREAM                DMA1_Stream7
+#define I2S3_DMAx_CHANNEL               DMA_CHANNEL_0
+#define I2S3_DMAx_IRQ                   DMA1_Stream7_IRQn
+#define I2S3_DMAx_PERIPH_DATA_SIZE      DMA_PDATAALIGN_HALFWORD
+#define I2S3_DMAx_MEM_DATA_SIZE         DMA_MDATAALIGN_HALFWORD
+#define DMA_MAX_SZE                     0xFFFF
+
+#define I2S3_IRQHandler                 DMA1_Stream7_IRQHandler
+
+/* Select the interrupt preemption priority and subpriority for the DMA interrupt */
+#define AUDIO_OUT_IRQ_PREPRIO           0x0E   /* Select the preemption priority level(0 is the highest) */
+
+/*------------------------------------------------------------------------------
+             CONFIGURATION: Audio Driver Configuration parameters
+------------------------------------------------------------------------------*/
+
+#define AUDIODATA_SIZE      2   /* 16-bits audio data size */
+
+/* Audio status definition */     
+#define AUDIO_OK                              0
+#define AUDIO_ERROR                           1
+#define AUDIO_TIMEOUT                         2
+
+#define DMA_MAX(_X_)                (((_X_) <= DMA_MAX_SZE)? (_X_):DMA_MAX_SZE)
+#define HTONS(A)  ((((uint16_t)(A) & 0xff00) >> 8) | (((uint16_t)(A) & 0x00ff) << 8))
+
+uint8_t AUDIO_OUT_Init(uint16_t OutputDevice, uint8_t Volume, uint32_t AudioFreq);
+uint8_t AUDIO_OUT_Play(uint16_t *pBuffer, uint32_t Size);
+void    AUDIO_OUT_ChangeBuffer(uint16_t *pData, uint16_t Size);
+uint8_t AUDIO_OUT_Pause(void);
+uint8_t AUDIO_OUT_Resume(void);
+uint8_t AUDIO_OUT_Stop(uint32_t Option);
+uint8_t AUDIO_OUT_SetVolume(uint8_t Volume);
+void    AUDIO_OUT_SetFrequency(uint32_t AudioFreq);
+uint8_t AUDIO_OUT_SetMute(uint32_t Cmd);
+uint8_t AUDIO_OUT_SetOutputMode(uint8_t Output);
+
+/* User Callbacks: user has to implement these functions in his code if they are needed. */
+/* This function is called when the requested data has been completely transferred. */
+void    AUDIO_OUT_TransferComplete_CallBack(void);
+
+/* This function is called when half of the requested buffer has been transferred. */
+void    AUDIO_OUT_HalfTransfer_CallBack(void);
+
+/* This function is called when an Interrupt due to transfer error on or peripheral
+   error occurs. */
+void    AUDIO_OUT_Error_CallBack(void);
+
+/* These function can be modified in case the current settings (e.g. DMA stream)
+   need to be changed for specific application needs */
+void  AUDIO_OUT_ClockConfig(I2S_HandleTypeDef *hi2s, uint32_t AudioFreq, void *Params);
+void  AUDIO_OUT_MspInit(I2S_HandleTypeDef *hi2s, void *Params);
+void  AUDIO_OUT_MspDeInit(I2S_HandleTypeDef *hi2s, void *Params);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AUDIO_H */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/Core/Src/Components/AUDIO_LINK.c b/Core/Src/Components/AUDIO_LINK.c
new file mode 100644
index 0000000..f23b0e0
--- /dev/null
+++ b/Core/Src/Components/AUDIO_LINK.c
@@ -0,0 +1,267 @@
+/**
+  ******************************************************************************
+  * @file    stm32f411e_discovery.c
+  * @author  MCD Application Team
+  * @brief   This file provides set of firmware functions to manage LEDs and
+  *          push-button available on STM32F411-Discovery Kit from STMicroelectronics.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */ 
+
+
+/**
+  ***************************************************************************************************************
+  ***************************************************************************************************************
+  ***************************************************************************************************************
+
+  File:		  AUDIO_LINK.c
+  Modifier:   ControllersTech.com
+  Updated:    10th JAN 2021
+
+  ***************************************************************************************************************
+  Copyright (C) 2017 ControllersTech.com
+
+  This is a free software under the GNU license, you can redistribute it and/or modify it under the terms
+  of the GNU General Public License version 3 as published by the Free Software Foundation.
+  This software library is shared with public for educational purposes, without WARRANTY and Author is not liable for any damages caused directly
+  or indirectly by this software, read more about this on the GNU General Public License.
+
+  ***************************************************************************************************************
+*/
+  
+/* Includes ------------------------------------------------------------------*/
+#include "AUDIO_LINK.h"
+
+uint32_t I2cxTimeout = I2Cx_TIMEOUT_MAX;    /*<! Value of Timeout when I2C communication fails */
+
+static I2C_HandleTypeDef I2cHandle;
+
+/* I2Cx bus function */
+static void    I2Cx_Init(void);
+static void    I2Cx_WriteData(uint16_t Addr, uint8_t Reg, uint8_t Value);
+static uint8_t I2Cx_ReadData(uint16_t Addr, uint8_t Reg);
+static void    I2Cx_Error (void);
+static void    I2Cx_MspInit(I2C_HandleTypeDef *hi2c);
+
+/* Link functions for AUDIO */
+void    AUDIO_IO_Init(void);
+void    AUDIO_IO_DeInit(void);
+void    AUDIO_IO_Write(uint8_t Addr, uint8_t Reg, uint8_t Value);
+uint8_t AUDIO_IO_Read(uint8_t Addr, uint8_t Reg);
+
+/*******************************************************************************
+                            BUS OPERATIONS
+*******************************************************************************/
+
+/******************************* I2C Routines *********************************/
+
+/**
+  * @brief  I2Cx Bus initialization.
+  */
+static void I2Cx_Init(void)
+{
+  if(HAL_I2C_GetState(&I2cHandle) == HAL_I2C_STATE_RESET)
+  {
+    I2cHandle.Instance = AUDIO_I2Cx;
+    I2cHandle.Init.OwnAddress1 =  0x43;
+    I2cHandle.Init.ClockSpeed = I2Cx_MAX_COMMUNICATION_FREQ;
+    I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
+    I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
+    I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
+    I2cHandle.Init.OwnAddress2 = 0x00;
+    I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
+    I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
+
+    /* Init the I2C */
+    I2Cx_MspInit(&I2cHandle);
+    HAL_I2C_Init(&I2cHandle);
+  }
+}
+
+/**
+  * @brief  Writes a value in a register of the device through BUS.
+  * @param  Addr: Device address on BUS Bus.  
+  * @param  Reg: The target register address to write
+  * @param  Value: The target register value to be written 
+  */
+static void I2Cx_WriteData(uint16_t Addr, uint8_t Reg, uint8_t Value)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+  
+  status = HAL_I2C_Mem_Write(&I2cHandle, Addr, (uint16_t)Reg, I2C_MEMADD_SIZE_8BIT, &Value, 1, I2cxTimeout);
+  
+  /* Check the communication status */
+  if(status != HAL_OK)
+  {
+    /* Execute user timeout callback */
+    I2Cx_Error();
+  }
+}
+
+/**
+  * @brief  Reads a register of the device through BUS.
+  * @param  Addr: Device address on BUS Bus.  
+  * @param  Reg: The target register address to write
+  * @retval Data read at register address
+  */
+static uint8_t I2Cx_ReadData(uint16_t Addr, uint8_t Reg)
+{
+  HAL_StatusTypeDef status = HAL_OK;
+  uint8_t value = 0;
+  
+  status = HAL_I2C_Mem_Read(&I2cHandle, Addr, Reg, I2C_MEMADD_SIZE_8BIT, &value, 1, I2cxTimeout);
+  
+  /* Check the communication status */
+  if(status != HAL_OK)
+  {
+    /* Execute user timeout callback */
+    I2Cx_Error();
+  }
+  return value;
+}
+
+/**
+  * @brief  I2Cx error treatment function.
+  */
+static void I2Cx_Error(void)
+{
+  /* De-initialize the I2C comunication BUS */
+  HAL_I2C_DeInit(&I2cHandle);
+  
+  /* Re- Initiaize the I2C comunication BUS */
+  I2Cx_Init();
+}
+
+/**
+  * @brief  I2Cx MSP Init.
+  * @param  hi2c: I2C handle
+  */
+static void I2Cx_MspInit(I2C_HandleTypeDef *hi2c)
+{
+  GPIO_InitTypeDef GPIO_InitStructure;
+
+  /* Enable the I2C peripheral */
+  AUDIO_I2Cx_CLOCK_ENABLE();
+
+  /* Enable SCK and SDA GPIO clocks */
+  AUDIO_I2Cx_GPIO_CLK_ENABLE();
+
+  /* I2Cx SD1 & SCK pin configuration */
+  GPIO_InitStructure.Pin = AUDIO_I2Cx_SDA_PIN | AUDIO_I2Cx_SCL_PIN;
+  GPIO_InitStructure.Mode = GPIO_MODE_AF_OD;
+  GPIO_InitStructure.Pull = GPIO_NOPULL;
+  GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
+  GPIO_InitStructure.Alternate = AUDIO_I2Cx_AF;
+
+  HAL_GPIO_Init(AUDIO_I2Cx_GPIO_PORT, &GPIO_InitStructure);
+
+  /* Force the I2C peripheral clock reset */
+  AUDIO_I2Cx_FORCE_RESET();
+
+  /* Release the I2C peripheral clock reset */
+  AUDIO_I2Cx_RELEASE_RESET();
+
+  /* Enable and set I2Cx Interrupt to the lowest priority */
+  HAL_NVIC_SetPriority(AUDIO_I2Cx_EV_IRQn, 0x0F, 0);
+  HAL_NVIC_EnableIRQ(AUDIO_I2Cx_EV_IRQn);
+
+  /* Enable and set I2Cx Interrupt to the lowest priority */
+  HAL_NVIC_SetPriority(AUDIO_I2Cx_ER_IRQn, 0x0F, 0);
+  HAL_NVIC_EnableIRQ(AUDIO_I2Cx_ER_IRQn);
+}
+
+/*******************************************************************************
+                            LINK OPERATIONS
+*******************************************************************************/
+
+
+/********************************* LINK AUDIO *********************************/
+
+/**
+  * @brief  Initializes Audio low level.
+  */
+void AUDIO_IO_Init(void) 
+{
+  GPIO_InitTypeDef  GPIO_InitStruct;
+  
+  /* Enable Reset GPIO Clock */
+  AUDIO_RESET_GPIO_CLK_ENABLE();
+  
+  /* Audio reset pin configuration -------------------------------------------*/
+  GPIO_InitStruct.Pin = AUDIO_RESET_PIN;
+  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
+  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
+  GPIO_InitStruct.Pull  = GPIO_NOPULL;
+  HAL_GPIO_Init(AUDIO_RESET_GPIO, &GPIO_InitStruct);
+  
+  I2Cx_Init();
+  
+  /* Power Down the codec */
+  CODEC_AUDIO_POWER_OFF();
+  
+  /* Wait for a delay to insure registers erasing */
+  HAL_Delay(5); 
+  
+  /* Power on the codec */
+  CODEC_AUDIO_POWER_ON();
+  
+  /* Wait for a delay to insure registers erasing */
+  HAL_Delay(5); 
+}
+
+/**
+  * @brief  DeInitializes Audio low level.
+  */
+void AUDIO_IO_DeInit(void) 
+{
+  
+}
+
+/**
+  * @brief  Writes a single data.
+  * @param  Addr: I2C address
+  * @param  Reg: Reg address 
+  * @param  Value: Data to be written
+  */
+void AUDIO_IO_Write (uint8_t Addr, uint8_t Reg, uint8_t Value)
+{
+  I2Cx_WriteData(Addr, Reg, Value);
+}
+
+/**
+  * @brief  Reads a single data.
+  * @param  Addr: I2C address
+  * @param  Reg: Reg address 
+  * @retval Data to be read
+  */
+uint8_t AUDIO_IO_Read (uint8_t Addr, uint8_t Reg)
+{
+  return I2Cx_ReadData(Addr, Reg);
+}
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/Core/Src/Components/AUDIO_LINK.h b/Core/Src/Components/AUDIO_LINK.h
new file mode 100644
index 0000000..81e0ba0
--- /dev/null
+++ b/Core/Src/Components/AUDIO_LINK.h
@@ -0,0 +1,114 @@
+/** 
+  ******************************************************************************
+  * @file    stm32f411e_discovery.h
+  * @author  MCD Application Team
+  * @brief   This file contains definitions for STM32F401-Discovery Kit's Leds and 
+  *          push-button hardware resources.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************  
+  */ 
+  
+
+/**
+  ***************************************************************************************************************
+  ***************************************************************************************************************
+  ***************************************************************************************************************
+
+  File:		  AUDIO_LINK.h
+  Modifier:   ControllersTech.com
+  Updated:    10th JAN 2021
+
+  ***************************************************************************************************************
+  Copyright (C) 2017 ControllersTech.com
+
+  This is a free software under the GNU license, you can redistribute it and/or modify it under the terms
+  of the GNU General Public License version 3 as published by the Free Software Foundation.
+  This software library is shared with public for educational purposes, without WARRANTY and Author is not liable for any damages caused directly
+  or indirectly by this software, read more about this on the GNU General Public License.
+
+  ***************************************************************************************************************
+*/
+
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __AUDIO_LINK_H
+#define __AUDIO_LINK_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+                                              
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f4xx_hal.h"
+
+/*############################### I2Cx #######################################*/
+#define AUDIO_I2Cx                          I2C1
+#define AUDIO_I2Cx_CLOCK_ENABLE()           __HAL_RCC_I2C1_CLK_ENABLE()
+#define AUDIO_I2Cx_GPIO_PORT                GPIOB                       /* GPIOB */
+#define AUDIO_I2Cx_SCL_PIN                  GPIO_PIN_6                  /* PB.06 */
+#define AUDIO_I2Cx_SDA_PIN                  GPIO_PIN_9                  /* PB.09 */
+#define AUDIO_I2Cx_GPIO_CLK_ENABLE()        __HAL_RCC_GPIOB_CLK_ENABLE()
+#define AUDIO_I2Cx_GPIO_CLK_DISABLE()       __HAL_RCC_GPIOB_CLK_DISABLE()
+#define AUDIO_I2Cx_AF                       GPIO_AF4_I2C1
+
+#define AUDIO_I2Cx_FORCE_RESET()            __HAL_RCC_I2C1_FORCE_RESET()
+#define AUDIO_I2Cx_RELEASE_RESET()          __HAL_RCC_I2C1_RELEASE_RESET()
+
+/* I2C interrupt requests */
+#define AUDIO_I2Cx_EV_IRQn                  I2C1_EV_IRQn
+#define AUDIO_I2Cx_ER_IRQn                  I2C1_ER_IRQn
+
+/* I2C speed and timeout max */
+#define I2Cx_TIMEOUT_MAX                        0xA000 /*<! The value of the maximal timeout for I2C waiting loops */
+#define I2Cx_MAX_COMMUNICATION_FREQ             ((uint32_t) 100000)
+
+
+/*################################### AUDIO ##################################*/
+/**
+  * @brief  AUDIO I2C Interface pins
+  */
+/* Device I2C address */
+#define AUDIO_I2C_ADDRESS                       0x94
+
+/* Audio codec power on/off macro definition */
+#define CODEC_AUDIO_POWER_OFF()      HAL_GPIO_WritePin(AUDIO_RESET_GPIO, AUDIO_RESET_PIN, GPIO_PIN_RESET)
+#define CODEC_AUDIO_POWER_ON()       HAL_GPIO_WritePin(AUDIO_RESET_GPIO, AUDIO_RESET_PIN, GPIO_PIN_SET)
+
+/* Audio Reset Pin definition */
+#define AUDIO_RESET_GPIO_CLK_ENABLE()           __HAL_RCC_GPIOD_CLK_ENABLE()
+#define AUDIO_RESET_PIN                         GPIO_PIN_4
+#define AUDIO_RESET_GPIO                        GPIOD
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AUDIO_LINK_H */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/Core/Src/Components/Start.cpp b/Core/Src/Components/Start.cpp
index 19e87c0..a63a517 100644
--- a/Core/Src/Components/Start.cpp
+++ b/Core/Src/Components/Start.cpp
@@ -8,6 +8,18 @@
 #include "main.h"
 #include "Start.hpp"
 
-void Start(){
+#include "AUDIO.h"
 
+uint16_t pBuffer[200];
+
+void Start(){
+	for(uint32_t i = 0; i<100; i++){
+			pBuffer[2*i] = i*655;
+			pBuffer[(2*i)+1] = 32768;
+	}
+	AUDIO_OUT_Init(2, 35, 96000);
+	AUDIO_OUT_Play(pBuffer, 400);
+	while(1){
+
+	}
 }
diff --git a/Core/Src/Components/cs43l22.c b/Core/Src/Components/cs43l22.c
new file mode 100644
index 0000000..3949418
--- /dev/null
+++ b/Core/Src/Components/cs43l22.c
@@ -0,0 +1,493 @@
+/**
+  ******************************************************************************
+  * @file    cs43l22.c
+  * @author  MCD Application Team
+  * @brief   This file provides the CS43L22 Audio Codec driver.   
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "cs43l22.h"
+
+/** @addtogroup BSP
+  * @{
+  */
+  
+/** @addtogroup Components
+  * @{
+  */ 
+
+/** @addtogroup CS43L22
+  * @brief     This file provides a set of functions needed to drive the 
+  *            CS43L22 audio codec.
+  * @{
+  */
+
+/** @defgroup CS43L22_Private_Types
+  * @{
+  */
+
+/**
+  * @}
+  */ 
+  
+/** @defgroup CS43L22_Private_Defines
+  * @{
+  */
+#define VOLUME_CONVERT(Volume)    (((Volume) > 100)? 255:((uint8_t)(((Volume) * 255) / 100)))  
+/* Uncomment this line to enable verifying data sent to codec after each write 
+   operation (for debug purpose) */
+#if !defined (VERIFY_WRITTENDATA)  
+/* #define VERIFY_WRITTENDATA */
+#endif /* VERIFY_WRITTENDATA */
+/**
+  * @}
+  */ 
+
+/** @defgroup CS43L22_Private_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */ 
+  
+/** @defgroup CS43L22_Private_Variables
+  * @{
+  */
+
+/* Audio codec driver structure initialization */  
+AUDIO_DrvTypeDef cs43l22_drv = 
+{
+  cs43l22_Init,
+  cs43l22_DeInit,
+  cs43l22_ReadID,
+
+  cs43l22_Play,
+  cs43l22_Pause,
+  cs43l22_Resume,
+  cs43l22_Stop,  
+  
+  cs43l22_SetFrequency,  
+  cs43l22_SetVolume,
+  cs43l22_SetMute,  
+  cs43l22_SetOutputMode,
+  cs43l22_Reset,
+};
+
+static uint8_t Is_cs43l22_Stop = 1;
+
+volatile uint8_t OutputDev = 0;
+
+/**
+  * @}
+  */ 
+
+/** @defgroup CS43L22_Function_Prototypes
+  * @{
+  */
+static uint8_t CODEC_IO_Write(uint8_t Addr, uint8_t Reg, uint8_t Value);
+/**
+  * @}
+  */ 
+
+/** @defgroup CS43L22_Private_Functions
+  * @{
+  */ 
+
+/**
+  * @brief Initializes the audio codec and the control interface.
+  * @param DeviceAddr: Device address on communication Bus.   
+  * @param OutputDevice: can be OUTPUT_DEVICE_SPEAKER, OUTPUT_DEVICE_HEADPHONE,
+  *                       OUTPUT_DEVICE_BOTH or OUTPUT_DEVICE_AUTO .
+  * @param Volume: Initial volume level (from 0 (Mute) to 100 (Max))
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_Init(uint16_t DeviceAddr, uint16_t OutputDevice, uint8_t Volume, uint32_t AudioFreq)
+{
+  uint32_t counter = 0;
+  
+  /* Initialize the Control interface of the Audio Codec */
+  AUDIO_IO_Init();     
+    
+  /* Keep Codec powered OFF */
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL1, 0x01);  
+  
+  /*Save Output device for mute ON/OFF procedure*/
+  switch (OutputDevice)
+  {
+  case OUTPUT_DEVICE_SPEAKER:
+    OutputDev = 0xFA;
+    break;
+    
+  case OUTPUT_DEVICE_HEADPHONE:
+    OutputDev = 0xAF;
+    break;
+    
+  case OUTPUT_DEVICE_BOTH:
+    OutputDev = 0xAA;
+    break;
+    
+  case OUTPUT_DEVICE_AUTO:
+    OutputDev = 0x05;
+    break;    
+    
+  default:
+    OutputDev = 0x05;
+    break;    
+  }
+  
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL2, OutputDev);
+  
+  /* Clock configuration: Auto detection */  
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_CLOCKING_CTL, 0x81);
+  
+  /* Set the Slave Mode and the audio Standard */  
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_INTERFACE_CTL1, CODEC_STANDARD);
+  
+  /* Set the Master volume */
+  counter += cs43l22_SetVolume(DeviceAddr, Volume);
+  
+  /* If the Speaker is enabled, set the Mono mode and volume attenuation level */
+  if(OutputDevice != OUTPUT_DEVICE_HEADPHONE)
+  {
+    /* Set the Speaker Mono mode */  
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_PLAYBACK_CTL2, 0x06);
+    
+    /* Set the Speaker attenuation level */  
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_SPEAKER_A_VOL, 0x00);
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_SPEAKER_B_VOL, 0x00);
+  }
+  
+  /* Additional configuration for the CODEC. These configurations are done to reduce
+  the time needed for the Codec to power off. If these configurations are removed, 
+  then a long delay should be added between powering off the Codec and switching 
+  off the I2S peripheral MCLK clock (which is the operating clock for Codec).
+  If this delay is not inserted, then the codec will not shut down properly and
+  it results in high noise after shut down. */
+  
+  /* Disable the analog soft ramp */
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_ANALOG_ZC_SR_SETT, 0x00);
+  /* Disable the digital soft ramp */
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_MISC_CTL, 0x04);
+  /* Disable the limiter attack level */
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_LIMIT_CTL1, 0x00);
+  /* Adjust Bass and Treble levels */
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_TONE_CTL, 0x0F);
+  /* Adjust PCM volume level */
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_PCMA_VOL, 0x0A);
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_PCMB_VOL, 0x0A);
+  
+  /* Return communication control value */
+  return counter;  
+}
+
+/**
+  * @brief  Deinitializes the audio codec.
+  * @param  None
+  * @retval  None
+  */
+void cs43l22_DeInit(void)
+{
+  /* Deinitialize Audio Codec interface */
+  AUDIO_IO_DeInit();
+}
+
+/**
+  * @brief  Get the CS43L22 ID.
+  * @param DeviceAddr: Device address on communication Bus.   
+  * @retval The CS43L22 ID 
+  */
+uint32_t cs43l22_ReadID(uint16_t DeviceAddr)
+{
+  uint8_t Value;
+  /* Initialize the Control interface of the Audio Codec */
+  AUDIO_IO_Init(); 
+  
+  Value = AUDIO_IO_Read(DeviceAddr, CS43L22_CHIPID_ADDR);
+  Value = (Value & CS43L22_ID_MASK);
+  
+  return((uint32_t) Value);
+}
+
+/**
+  * @brief Start the audio Codec play feature.
+  * @note For this codec no Play options are required.
+  * @param DeviceAddr: Device address on communication Bus.   
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_Play(uint16_t DeviceAddr, uint16_t* pBuffer, uint16_t Size)
+{
+  uint32_t counter = 0;
+  
+  if(Is_cs43l22_Stop == 1)
+  {
+    /* Enable the digital soft ramp */
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_MISC_CTL, 0x06);
+  
+    /* Enable Output device */  
+    counter += cs43l22_SetMute(DeviceAddr, AUDIO_MUTE_OFF);
+    
+    /* Power on the Codec */
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL1, 0x9E);  
+    Is_cs43l22_Stop = 0;
+  }
+  
+  /* Return communication control value */
+  return counter;  
+}
+
+/**
+  * @brief Pauses playing on the audio codec.
+  * @param DeviceAddr: Device address on communication Bus. 
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_Pause(uint16_t DeviceAddr)
+{  
+  uint32_t counter = 0;
+ 
+  /* Pause the audio file playing */
+  /* Mute the output first */
+  counter += cs43l22_SetMute(DeviceAddr, AUDIO_MUTE_ON);
+  
+  /* Put the Codec in Power save mode */    
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL1, 0x01);
+ 
+  return counter;
+}
+
+/**
+  * @brief Resumes playing on the audio codec.
+  * @param DeviceAddr: Device address on communication Bus. 
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_Resume(uint16_t DeviceAddr)
+{
+  uint32_t counter = 0;
+  volatile uint32_t index = 0x00;
+  /* Resumes the audio file playing */  
+  /* Unmute the output first */
+  counter += cs43l22_SetMute(DeviceAddr, AUDIO_MUTE_OFF);
+
+  for(index = 0x00; index < 0xFF; index++);
+  
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL2, OutputDev);
+
+  /* Exit the Power save mode */
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL1, 0x9E); 
+  
+  return counter;
+}
+
+/**
+  * @brief Stops audio Codec playing. It powers down the codec.
+  * @param DeviceAddr: Device address on communication Bus. 
+  * @param CodecPdwnMode: selects the  power down mode.
+  *          - CODEC_PDWN_HW: Physically power down the codec. When resuming from this
+  *                           mode, the codec is set to default configuration 
+  *                           (user should re-Initialize the codec in order to 
+  *                            play again the audio stream).
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_Stop(uint16_t DeviceAddr, uint32_t CodecPdwnMode)
+{
+  uint32_t counter = 0;
+  
+  /* Mute the output first */
+  counter += cs43l22_SetMute(DeviceAddr, AUDIO_MUTE_ON);
+
+  /* Disable the digital soft ramp */
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_MISC_CTL, 0x04);
+  
+  /* Power down the DAC and the speaker (PMDAC and PMSPK bits)*/
+  counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL1, 0x9F);
+  
+  Is_cs43l22_Stop = 1;
+  return counter;    
+}
+
+/**
+  * @brief Sets higher or lower the codec volume level.
+  * @param DeviceAddr: Device address on communication Bus.   
+  * @param Volume: a byte value from 0 to 255 (refer to codec registers 
+  *                description for more details).
+  *         
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_SetVolume(uint16_t DeviceAddr, uint8_t Volume)
+{
+  uint32_t counter = 0;
+  uint8_t convertedvol = VOLUME_CONVERT(Volume);
+
+  if(convertedvol > 0xE6)
+  {
+    /* Set the Master volume */
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_MASTER_A_VOL, convertedvol - 0xE7); 
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_MASTER_B_VOL, convertedvol - 0xE7);     
+  }
+  else
+  {
+    /* Set the Master volume */
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_MASTER_A_VOL, convertedvol + 0x19); 
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_MASTER_B_VOL, convertedvol + 0x19); 
+  }
+
+  return counter;
+}
+
+/**
+  * @brief Sets new frequency.
+  * @param DeviceAddr: Device address on communication Bus.   
+  * @param AudioFreq: Audio frequency used to play the audio stream.
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_SetFrequency(uint16_t DeviceAddr, uint32_t AudioFreq)
+{
+  return 0;
+}
+
+/**
+  * @brief Enables or disables the mute feature on the audio codec.
+  * @param DeviceAddr: Device address on communication Bus.   
+  * @param Cmd: AUDIO_MUTE_ON to enable the mute or AUDIO_MUTE_OFF to disable the
+  *             mute mode.
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_SetMute(uint16_t DeviceAddr, uint32_t Cmd)
+{
+  uint32_t counter = 0;
+  
+  /* Set the Mute mode */
+  if(Cmd == AUDIO_MUTE_ON)
+  {
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL2, 0xFF);
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_HEADPHONE_A_VOL, 0x01);
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_HEADPHONE_B_VOL, 0x01);
+  }
+  else /* AUDIO_MUTE_OFF Disable the Mute */
+  {
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_HEADPHONE_A_VOL, 0x00);
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_HEADPHONE_B_VOL, 0x00);
+    counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL2, OutputDev);
+  }
+  return counter;
+}
+
+/**
+  * @brief Switch dynamically (while audio file is played) the output target 
+  *         (speaker or headphone).
+  * @note This function modifies a global variable of the audio codec driver: OutputDev.
+  * @param DeviceAddr: Device address on communication Bus.
+  * @param Output: specifies the audio output target: OUTPUT_DEVICE_SPEAKER,
+  *         OUTPUT_DEVICE_HEADPHONE, OUTPUT_DEVICE_BOTH or OUTPUT_DEVICE_AUTO 
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_SetOutputMode(uint16_t DeviceAddr, uint8_t Output)
+{
+  uint32_t counter = 0; 
+  
+  switch (Output) 
+  {
+    case OUTPUT_DEVICE_SPEAKER:
+      counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL2, 0xFA); /* SPK always ON & HP always OFF */
+      OutputDev = 0xFA;
+      break;
+      
+    case OUTPUT_DEVICE_HEADPHONE:
+      counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL2, 0xAF); /* SPK always OFF & HP always ON */
+      OutputDev = 0xAF;
+      break;
+      
+    case OUTPUT_DEVICE_BOTH:
+      counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL2, 0xAA); /* SPK always ON & HP always ON */
+      OutputDev = 0xAA;
+      break;
+      
+    case OUTPUT_DEVICE_AUTO:
+      counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL2, 0x05); /* Detect the HP or the SPK automatically */
+      OutputDev = 0x05;
+      break;    
+      
+    default:
+      counter += CODEC_IO_Write(DeviceAddr, CS43L22_REG_POWER_CTL2, 0x05); /* Detect the HP or the SPK automatically */
+      OutputDev = 0x05;
+      break;
+  }  
+  return counter;
+}
+
+/**
+  * @brief Resets cs43l22 registers.
+  * @param DeviceAddr: Device address on communication Bus. 
+  * @retval 0 if correct communication, else wrong communication
+  */
+uint32_t cs43l22_Reset(uint16_t DeviceAddr)
+{
+  return 0;
+}
+
+/**
+  * @brief  Writes/Read a single data.
+  * @param  Addr: I2C address
+  * @param  Reg: Reg address 
+  * @param  Value: Data to be written
+  * @retval None
+  */
+static uint8_t CODEC_IO_Write(uint8_t Addr, uint8_t Reg, uint8_t Value)
+{
+  uint32_t result = 0;
+  
+  AUDIO_IO_Write(Addr, Reg, Value);
+  
+#ifdef VERIFY_WRITTENDATA
+  /* Verify that the data has been correctly written */  
+  result = (AUDIO_IO_Read(Addr, Reg) == Value)? 0:1;
+#endif /* VERIFY_WRITTENDATA */
+  
+  return result;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/Core/Src/Components/cs43l22.h b/Core/Src/Components/cs43l22.h
new file mode 100644
index 0000000..385692f
--- /dev/null
+++ b/Core/Src/Components/cs43l22.h
@@ -0,0 +1,228 @@
+/**
+  ******************************************************************************
+  * @file    cs43l22.h
+  * @author  MCD Application Team
+  * @brief   This file contains all the functions prototypes for the cs43l22.c driver.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __CS43L22_H
+#define __CS43L22_H
+
+/* Includes ------------------------------------------------------------------*/
+#include "AUDIO.h"
+#include <stdint.h>
+
+/** @addtogroup BSP
+  * @{
+  */ 
+
+/** @addtogroup Component
+  * @{
+  */ 
+  
+/** @addtogroup CS43L22
+  * @{
+  */
+
+/** @defgroup CS43L22_Exported_Types
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @defgroup CS43L22_Exported_Constants
+  * @{
+  */ 
+
+/******************************************************************************/
+/***************************  Codec User defines ******************************/
+/******************************************************************************/
+/* Codec output DEVICE */
+#define OUTPUT_DEVICE_SPEAKER         1
+#define OUTPUT_DEVICE_HEADPHONE       2
+#define OUTPUT_DEVICE_BOTH            3
+#define OUTPUT_DEVICE_AUTO            4
+
+/* Volume Levels values */
+#define DEFAULT_VOLMIN                0x00
+#define DEFAULT_VOLMAX                0xFF
+#define DEFAULT_VOLSTEP               0x04
+
+#define AUDIO_PAUSE                   0
+#define AUDIO_RESUME                  1
+
+/* Codec POWER DOWN modes */
+#define CODEC_PDWN_HW                 1
+#define CODEC_PDWN_SW                 2
+
+/* MUTE commands */
+#define AUDIO_MUTE_ON                 1
+#define AUDIO_MUTE_OFF                0
+
+/* AUDIO FREQUENCY */
+#define AUDIO_FREQUENCY_192K          ((uint32_t)192000)
+#define AUDIO_FREQUENCY_96K           ((uint32_t)96000)
+#define AUDIO_FREQUENCY_48K           ((uint32_t)48000)
+#define AUDIO_FREQUENCY_44K           ((uint32_t)44100)
+#define AUDIO_FREQUENCY_32K           ((uint32_t)32000)
+#define AUDIO_FREQUENCY_22K           ((uint32_t)22050)
+#define AUDIO_FREQUENCY_16K           ((uint32_t)16000)
+#define AUDIO_FREQUENCY_11K           ((uint32_t)11025)
+#define AUDIO_FREQUENCY_8K            ((uint32_t)8000)  
+
+/** CS43l22 Registers  ***/
+#define   CS43L22_REG_ID                  0x01
+#define   CS43L22_REG_POWER_CTL1          0x02
+#define   CS43L22_REG_POWER_CTL2          0x04
+#define   CS43L22_REG_CLOCKING_CTL        0x05
+#define   CS43L22_REG_INTERFACE_CTL1      0x06
+#define   CS43L22_REG_INTERFACE_CTL2      0x07
+#define   CS43L22_REG_PASSTHR_A_SELECT    0x08
+#define   CS43L22_REG_PASSTHR_B_SELECT    0x09
+#define   CS43L22_REG_ANALOG_ZC_SR_SETT   0x0A
+#define   CS43L22_REG_PASSTHR_GANG_CTL    0x0C
+#define   CS43L22_REG_PLAYBACK_CTL1       0x0D
+#define   CS43L22_REG_MISC_CTL            0x0E
+#define   CS43L22_REG_PLAYBACK_CTL2       0x0F
+#define   CS43L22_REG_PASSTHR_A_VOL       0x14
+#define   CS43L22_REG_PASSTHR_B_VOL       0x15
+#define   CS43L22_REG_PCMA_VOL            0x1A
+#define   CS43L22_REG_PCMB_VOL            0x1B
+#define   CS43L22_REG_BEEP_FREQ_ON_TIME   0x1C
+#define   CS43L22_REG_BEEP_VOL_OFF_TIME   0x1D
+#define   CS43L22_REG_BEEP_TONE_CFG       0x1E
+#define   CS43L22_REG_TONE_CTL            0x1F
+#define   CS43L22_REG_MASTER_A_VOL        0x20
+#define   CS43L22_REG_MASTER_B_VOL        0x21
+#define   CS43L22_REG_HEADPHONE_A_VOL     0x22
+#define   CS43L22_REG_HEADPHONE_B_VOL     0x23
+#define   CS43L22_REG_SPEAKER_A_VOL       0x24
+#define   CS43L22_REG_SPEAKER_B_VOL       0x25
+#define   CS43L22_REG_CH_MIXER_SWAP       0x26
+#define   CS43L22_REG_LIMIT_CTL1          0x27
+#define   CS43L22_REG_LIMIT_CTL2          0x28
+#define   CS43L22_REG_LIMIT_ATTACK_RATE   0x29
+#define   CS43L22_REG_OVF_CLK_STATUS      0x2E
+#define   CS43L22_REG_BATT_COMPENSATION   0x2F
+#define   CS43L22_REG_VP_BATTERY_LEVEL    0x30
+#define   CS43L22_REG_SPEAKER_STATUS      0x31
+#define   CS43L22_REG_TEMPMONITOR_CTL     0x32
+#define   CS43L22_REG_THERMAL_FOLDBACK    0x33
+#define   CS43L22_REG_CHARGE_PUMP_FREQ    0x34
+
+/******************************************************************************/
+/****************************** REGISTER MAPPING ******************************/
+/******************************************************************************/
+/** 
+  * @brief  CS43L22 ID  
+  */  
+#define  CS43L22_ID            0xE0
+#define  CS43L22_ID_MASK       0xF8
+/**
+  * @brief Chip ID Register: Chip I.D. and Revision Register
+  *  Read only register
+  *  Default value: 0x01
+  *  [7:3] CHIPID[4:0]: I.D. code for the CS43L22.
+  *        Default value: 11100b
+  *  [2:0] REVID[2:0]: CS43L22 revision level.
+  *        Default value: 
+  *        000 - Rev A0
+  *        001 - Rev A1
+  *        010 - Rev B0
+  *        011 - Rev B1
+  */
+#define CS43L22_CHIPID_ADDR    0x01
+
+/**
+  * @}
+  */ 
+
+/** @defgroup CS43L22_Exported_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */ 
+
+/** @defgroup CS43L22_Exported_Functions
+  * @{
+  */
+    
+/*------------------------------------------------------------------------------
+                           Audio Codec functions 
+------------------------------------------------------------------------------*/
+/* High Layer codec functions */
+uint32_t cs43l22_Init(uint16_t DeviceAddr, uint16_t OutputDevice, uint8_t Volume, uint32_t AudioFreq);
+void     cs43l22_DeInit(void);
+uint32_t cs43l22_ReadID(uint16_t DeviceAddr);
+uint32_t cs43l22_Play(uint16_t DeviceAddr, uint16_t* pBuffer, uint16_t Size);
+uint32_t cs43l22_Pause(uint16_t DeviceAddr);
+uint32_t cs43l22_Resume(uint16_t DeviceAddr);
+uint32_t cs43l22_Stop(uint16_t DeviceAddr, uint32_t Cmd);
+uint32_t cs43l22_SetVolume(uint16_t DeviceAddr, uint8_t Volume);
+uint32_t cs43l22_SetFrequency(uint16_t DeviceAddr, uint32_t AudioFreq);
+uint32_t cs43l22_SetMute(uint16_t DeviceAddr, uint32_t Cmd);
+uint32_t cs43l22_SetOutputMode(uint16_t DeviceAddr, uint8_t Output);
+uint32_t cs43l22_Reset(uint16_t DeviceAddr);
+
+/* AUDIO IO functions */
+void      AUDIO_IO_Init(void);
+void      AUDIO_IO_DeInit(void);
+void      AUDIO_IO_Write(uint8_t Addr, uint8_t Reg, uint8_t Value);
+uint8_t   AUDIO_IO_Read(uint8_t Addr, uint8_t Reg);
+
+/* Audio driver structure */
+
+//extern AUDIO_DrvTypeDef cs43l22_drv;
+
+#endif /* __CS43L22_H */
+
+/**
+  * @}
+  */ 
+
+/**
+  * @}
+  */ 
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */ 
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 50eb7f4..0caaa6c 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -24,6 +24,7 @@
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
 #include "Components/Start.hpp"
+
 /* USER CODE END Includes */
 
 /* Private typedef -----------------------------------------------------------*/
@@ -45,6 +46,7 @@
 
 I2S_HandleTypeDef hi2s2;
 I2S_HandleTypeDef hi2s3;
+DMA_HandleTypeDef hdma_spi3_tx;
 
 SD_HandleTypeDef hsd;
 
@@ -63,6 +65,7 @@ static void MX_I2S2_Init(void);
 static void MX_I2S3_Init(void);
 static void MX_SPI1_Init(void);
 static void MX_SDIO_SD_Init(void);
+static void MX_DMA_Init(void);
 /* USER CODE BEGIN PFP */
 
 /* USER CODE END PFP */
@@ -108,8 +111,9 @@ int main(void)
   MX_I2S3_Init();
   MX_SPI1_Init();
   MX_SDIO_SD_Init();
-  MX_FATFS_Init();
+  MX_DMA_Init();
   MX_USB_DEVICE_Init();
+  MX_FATFS_Init();
   /* USER CODE BEGIN 2 */
   Start();
   /* USER CODE END 2 */
@@ -142,11 +146,12 @@ void SystemClock_Config(void)
   /** Initializes the RCC Oscillators according to the specified parameters
   * in the RCC_OscInitTypeDef structure.
   */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLM = 4;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
+  RCC_OscInitStruct.PLL.PLLM = 8;
   RCC_OscInitStruct.PLL.PLLN = 192;
   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
   RCC_OscInitStruct.PLL.PLLQ = 8;
@@ -161,7 +166,7 @@ void SystemClock_Config(void)
                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
@@ -182,7 +187,7 @@ void PeriphCommonClock_Config(void)
   */
   PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2S;
   PeriphClkInitStruct.PLLI2S.PLLI2SN = 200;
-  PeriphClkInitStruct.PLLI2S.PLLI2SM = 5;
+  PeriphClkInitStruct.PLLI2S.PLLI2SM = 10;
   PeriphClkInitStruct.PLLI2S.PLLI2SR = 2;
   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
   {
@@ -358,6 +363,22 @@ static void MX_SPI1_Init(void)
 
 }
 
+/**
+  * Enable DMA controller clock
+  */
+static void MX_DMA_Init(void)
+{
+
+  /* DMA controller clock enable */
+  __HAL_RCC_DMA1_CLK_ENABLE();
+
+  /* DMA interrupt init */
+  /* DMA1_Stream5_IRQn interrupt configuration */
+  HAL_NVIC_SetPriority(DMA1_Stream5_IRQn, 0, 0);
+  HAL_NVIC_EnableIRQ(DMA1_Stream5_IRQn);
+
+}
+
 /**
   * @brief GPIO Initialization Function
   * @param None
diff --git a/Core/Src/stm32f4xx_hal_msp.c b/Core/Src/stm32f4xx_hal_msp.c
index 7c89d41..6614842 100644
--- a/Core/Src/stm32f4xx_hal_msp.c
+++ b/Core/Src/stm32f4xx_hal_msp.c
@@ -23,6 +23,7 @@
 /* USER CODE BEGIN Includes */
 
 /* USER CODE END Includes */
+extern DMA_HandleTypeDef hdma_spi3_tx;
 
 /* Private typedef -----------------------------------------------------------*/
 /* USER CODE BEGIN TD */
@@ -225,6 +226,28 @@ void HAL_I2S_MspInit(I2S_HandleTypeDef* hi2s)
     GPIO_InitStruct.Alternate = GPIO_AF6_SPI3;
     HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
+    /* I2S3 DMA Init */
+    /* SPI3_TX Init */
+    hdma_spi3_tx.Instance = DMA1_Stream5;
+    hdma_spi3_tx.Init.Channel = DMA_CHANNEL_0;
+    hdma_spi3_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
+    hdma_spi3_tx.Init.PeriphInc = DMA_PINC_DISABLE;
+    hdma_spi3_tx.Init.MemInc = DMA_MINC_ENABLE;
+    hdma_spi3_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
+    hdma_spi3_tx.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
+    hdma_spi3_tx.Init.Mode = DMA_CIRCULAR;
+    hdma_spi3_tx.Init.Priority = DMA_PRIORITY_LOW;
+    hdma_spi3_tx.Init.FIFOMode = DMA_FIFOMODE_ENABLE;
+    hdma_spi3_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
+    hdma_spi3_tx.Init.MemBurst = DMA_MBURST_SINGLE;
+    hdma_spi3_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;
+    if (HAL_DMA_Init(&hdma_spi3_tx) != HAL_OK)
+    {
+      Error_Handler();
+    }
+
+    __HAL_LINKDMA(hi2s,hdmatx,hdma_spi3_tx);
+
   /* USER CODE BEGIN SPI3_MspInit 1 */
 
   /* USER CODE END SPI3_MspInit 1 */
@@ -280,6 +303,8 @@ void HAL_I2S_MspDeInit(I2S_HandleTypeDef* hi2s)
 
     HAL_GPIO_DeInit(GPIOC, I2S3_MCK_Pin|I2S3_SCK_Pin|I2S3_SD_Pin);
 
+    /* I2S3 DMA DeInit */
+    HAL_DMA_DeInit(hi2s->hdmatx);
   /* USER CODE BEGIN SPI3_MspDeInit 1 */
 
   /* USER CODE END SPI3_MspDeInit 1 */
diff --git a/Core/Src/stm32f4xx_it.c b/Core/Src/stm32f4xx_it.c
index 2352442..d25cb5c 100644
--- a/Core/Src/stm32f4xx_it.c
+++ b/Core/Src/stm32f4xx_it.c
@@ -56,6 +56,7 @@
 
 /* External variables --------------------------------------------------------*/
 extern PCD_HandleTypeDef hpcd_USB_OTG_FS;
+extern DMA_HandleTypeDef hdma_spi3_tx;
 /* USER CODE BEGIN EV */
 
 /* USER CODE END EV */
@@ -198,6 +199,20 @@ void SysTick_Handler(void)
 /* please refer to the startup file (startup_stm32f4xx.s).                    */
 /******************************************************************************/
 
+/**
+  * @brief This function handles DMA1 stream5 global interrupt.
+  */
+void DMA1_Stream5_IRQHandler(void)
+{
+  /* USER CODE BEGIN DMA1_Stream5_IRQn 0 */
+
+  /* USER CODE END DMA1_Stream5_IRQn 0 */
+  HAL_DMA_IRQHandler(&hdma_spi3_tx);
+  /* USER CODE BEGIN DMA1_Stream5_IRQn 1 */
+
+  /* USER CODE END DMA1_Stream5_IRQn 1 */
+}
+
 /**
   * @brief This function handles USB On The Go FS global interrupt.
   */
diff --git a/F411-DMA-Audio Debug.launch b/F411-DMA-Audio Debug.launch
new file mode 100644
index 0000000..8c9ad6a
--- /dev/null
+++ b/F411-DMA-Audio Debug.launch	
@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<launchConfiguration type="com.st.stm32cube.ide.mcu.debug.launch.launchConfigurationType">
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.launch.access_port_id" value="0"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.enable_live_expr" value="true"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.enable_swv" value="false"/>
+    <intAttribute key="com.st.stm32cube.ide.mcu.debug.launch.formatVersion" value="2"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.launch.ip_address_local" value="localhost"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.limit_swo_clock.enabled" value="false"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.launch.limit_swo_clock.value" value=""/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.launch.loadList" value="{&quot;fItems&quot;:[{&quot;fIsFromMainTab&quot;:true,&quot;fPath&quot;:&quot;Debug/F411-DMA-Audio.elf&quot;,&quot;fProjectName&quot;:&quot;F411-DMA-Audio&quot;,&quot;fPerformBuild&quot;:true,&quot;fDownload&quot;:true,&quot;fLoadSymbols&quot;:true}]}"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.launch.override_start_address_mode" value="default"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.launch.remoteCommand" value="target remote"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.startServer" value="true"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.startuptab.exception.divby0" value="true"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.startuptab.exception.unaligned" value="false"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.startuptab.haltonexception" value="true"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.swd_mode" value="true"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.launch.swv_port" value="61235"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.launch.swv_trace_hclk" value="16000000"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.useRemoteTarget" value="true"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.launch.vector_table" value=""/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.launch.verify_flash_download" value="true"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.cti_allow_halt" value="false"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.cti_signal_halt" value="false"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.enable_external_loader" value="false"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.enable_logging" value="false"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.enable_max_halt_delay" value="false"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.enable_shared_stlink" value="false"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.external_loader" value=""/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.external_loader_init" value="false"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.frequency" value="0"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.halt_all_on_reset" value="false"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.log_file" value="C:\Users\Gabriel\OneDrive\Documentos\TrabalhosPessoais\Playgrounds\F411-DMA-Audio\Debug\st-link_gdbserver_log.txt"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.low_power_debug" value="enable"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.max_halt_delay" value="2"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.reset_strategy" value="connect_under_reset"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.stlink_check_serial_number" value="false"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.stlink_txt_serial_number" value=""/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.stlink.watchdog_config" value="none"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.debug.stlinkenable_rtos" value="false"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.debug.stlinkrestart_configurations" value="{&quot;fVersion&quot;:1,&quot;fItems&quot;:[{&quot;fDisplayName&quot;:&quot;Reset&quot;,&quot;fIsSuppressible&quot;:false,&quot;fResetAttribute&quot;:&quot;Software system reset&quot;,&quot;fResetStrategies&quot;:[{&quot;fDisplayName&quot;:&quot;Software system reset&quot;,&quot;fLaunchAttribute&quot;:&quot;system_reset&quot;,&quot;fGdbCommands&quot;:[&quot;monitor reset\r\n&quot;],&quot;fCmdOptions&quot;:[&quot;-g&quot;]},{&quot;fDisplayName&quot;:&quot;Hardware reset&quot;,&quot;fLaunchAttribute&quot;:&quot;hardware_reset&quot;,&quot;fGdbCommands&quot;:[&quot;monitor reset hardware\r\n&quot;],&quot;fCmdOptions&quot;:[&quot;-g&quot;]},{&quot;fDisplayName&quot;:&quot;Core reset&quot;,&quot;fLaunchAttribute&quot;:&quot;core_reset&quot;,&quot;fGdbCommands&quot;:[&quot;monitor reset core\r\n&quot;],&quot;fCmdOptions&quot;:[&quot;-g&quot;]},{&quot;fDisplayName&quot;:&quot;None&quot;,&quot;fLaunchAttribute&quot;:&quot;no_reset&quot;,&quot;fGdbCommands&quot;:[],&quot;fCmdOptions&quot;:[&quot;-g&quot;]}],&quot;fGdbCommandGroup&quot;:{&quot;name&quot;:&quot;Additional commands&quot;,&quot;commands&quot;:[]},&quot;fStartApplication&quot;:true}]}"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.rtosproxy.enableRtosProxy" value="false"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.rtosproxy.rtosProxyCustomProperties" value=""/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.rtosproxy.rtosProxyDriver" value="threadx"/>
+    <booleanAttribute key="com.st.stm32cube.ide.mcu.rtosproxy.rtosProxyDriverAuto" value="false"/>
+    <stringAttribute key="com.st.stm32cube.ide.mcu.rtosproxy.rtosProxyDriverPort" value="cortex_m0"/>
+    <intAttribute key="com.st.stm32cube.ide.mcu.rtosproxy.rtosProxyPort" value="60000"/>
+    <booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.doHalt" value="false"/>
+    <booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.doReset" value="false"/>
+    <stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.initCommands" value=""/>
+    <stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.ipAddress" value="localhost"/>
+    <stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.jtagDeviceId" value="com.st.stm32cube.ide.mcu.debug.stlink"/>
+    <stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.pcRegister" value=""/>
+    <intAttribute key="org.eclipse.cdt.debug.gdbjtag.core.portNumber" value="61234"/>
+    <stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.runCommands" value=""/>
+    <booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.setPcRegister" value="false"/>
+    <booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.setResume" value="true"/>
+    <booleanAttribute key="org.eclipse.cdt.debug.gdbjtag.core.setStopAt" value="true"/>
+    <stringAttribute key="org.eclipse.cdt.debug.gdbjtag.core.stopAt" value="main"/>
+    <stringAttribute key="org.eclipse.cdt.dsf.gdb.DEBUG_NAME" value="arm-none-eabi-gdb"/>
+    <booleanAttribute key="org.eclipse.cdt.dsf.gdb.NON_STOP" value="false"/>
+    <booleanAttribute key="org.eclipse.cdt.dsf.gdb.UPDATE_THREADLIST_ON_SUSPEND" value="false"/>
+    <intAttribute key="org.eclipse.cdt.launch.ATTR_BUILD_BEFORE_LAUNCH_ATTR" value="2"/>
+    <stringAttribute key="org.eclipse.cdt.launch.COREFILE_PATH" value=""/>
+    <stringAttribute key="org.eclipse.cdt.launch.DEBUGGER_START_MODE" value="remote"/>
+    <booleanAttribute key="org.eclipse.cdt.launch.DEBUGGER_STOP_AT_MAIN" value="true"/>
+    <stringAttribute key="org.eclipse.cdt.launch.DEBUGGER_STOP_AT_MAIN_SYMBOL" value="main"/>
+    <stringAttribute key="org.eclipse.cdt.launch.PROGRAM_NAME" value="Debug/F411-DMA-Audio.elf"/>
+    <stringAttribute key="org.eclipse.cdt.launch.PROJECT_ATTR" value="F411-DMA-Audio"/>
+    <booleanAttribute key="org.eclipse.cdt.launch.PROJECT_BUILD_CONFIG_AUTO_ATTR" value="true"/>
+    <stringAttribute key="org.eclipse.cdt.launch.PROJECT_BUILD_CONFIG_ID_ATTR" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.config.exe.debug.986831023"/>
+    <listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_PATHS">
+        <listEntry value="/F411-DMA-Audio"/>
+    </listAttribute>
+    <listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_TYPES">
+        <listEntry value="4"/>
+    </listAttribute>
+    <stringAttribute key="org.eclipse.dsf.launch.MEMORY_BLOCKS" value="&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; standalone=&quot;no&quot;?&gt;&lt;memoryBlockExpressionList context=&quot;reserved-for-future-use&quot;/&gt;"/>
+    <stringAttribute key="process_factory_id" value="com.st.stm32cube.ide.mcu.debug.launch.HardwareDebugProcessFactory"/>
+</launchConfiguration>
diff --git a/F411-DMA-Audio.ioc b/F411-DMA-Audio.ioc
index 2dd61c0..ee0e2c2 100644
--- a/F411-DMA-Audio.ioc
+++ b/F411-DMA-Audio.ioc
@@ -1,4 +1,19 @@
 #MicroXplorer Configuration settings - do not modify
+Dma.Request0=SPI3_TX
+Dma.RequestsNb=1
+Dma.SPI3_TX.0.Direction=DMA_MEMORY_TO_PERIPH
+Dma.SPI3_TX.0.FIFOMode=DMA_FIFOMODE_ENABLE
+Dma.SPI3_TX.0.FIFOThreshold=DMA_FIFO_THRESHOLD_FULL
+Dma.SPI3_TX.0.Instance=DMA1_Stream5
+Dma.SPI3_TX.0.MemBurst=DMA_MBURST_SINGLE
+Dma.SPI3_TX.0.MemDataAlignment=DMA_MDATAALIGN_HALFWORD
+Dma.SPI3_TX.0.MemInc=DMA_MINC_ENABLE
+Dma.SPI3_TX.0.Mode=DMA_CIRCULAR
+Dma.SPI3_TX.0.PeriphBurst=DMA_PBURST_SINGLE
+Dma.SPI3_TX.0.PeriphDataAlignment=DMA_PDATAALIGN_HALFWORD
+Dma.SPI3_TX.0.PeriphInc=DMA_PINC_DISABLE
+Dma.SPI3_TX.0.Priority=DMA_PRIORITY_LOW
+Dma.SPI3_TX.0.RequestParameters=Instance,Direction,PeriphInc,MemInc,PeriphDataAlignment,MemDataAlignment,Mode,Priority,FIFOMode,FIFOThreshold,MemBurst,PeriphBurst
 FATFS.BSP.number=1
 FATFS0.BSP.STBoard=false
 FATFS0.BSP.api=Unknown
@@ -30,18 +45,19 @@ I2S3.VirtualMode=I2S_MODE_MASTER
 KeepUserPlacement=false
 Mcu.CPN=STM32F411VET6
 Mcu.Family=STM32F4
-Mcu.IP0=FATFS
-Mcu.IP1=I2C1
-Mcu.IP10=USB_OTG_FS
-Mcu.IP2=I2S2
-Mcu.IP3=I2S3
-Mcu.IP4=NVIC
-Mcu.IP5=RCC
-Mcu.IP6=SDIO
-Mcu.IP7=SPI1
-Mcu.IP8=SYS
-Mcu.IP9=USB_DEVICE
-Mcu.IPNb=11
+Mcu.IP0=DMA
+Mcu.IP1=FATFS
+Mcu.IP10=USB_DEVICE
+Mcu.IP11=USB_OTG_FS
+Mcu.IP2=I2C1
+Mcu.IP3=I2S2
+Mcu.IP4=I2S3
+Mcu.IP5=NVIC
+Mcu.IP6=RCC
+Mcu.IP7=SDIO
+Mcu.IP8=SPI1
+Mcu.IP9=SYS
+Mcu.IPNb=12
 Mcu.Name=STM32F411V(C-E)Tx
 Mcu.Package=LQFP100
 Mcu.Pin0=PE2
@@ -93,6 +109,7 @@ Mcu.UserName=STM32F411VETx
 MxCube.Version=6.5.0
 MxDb.Version=DB.6.0.50
 NVIC.BusFault_IRQn=true\:0\:0\:false\:false\:true\:true\:false\:true
+NVIC.DMA1_Stream5_IRQn=true\:0\:0\:false\:false\:true\:false\:true\:true
 NVIC.DebugMonitor_IRQn=true\:0\:0\:false\:false\:true\:true\:false\:true
 NVIC.ForceEnableDMAVector=true
 NVIC.HardFault_IRQn=true\:0\:0\:false\:false\:true\:true\:false\:true
@@ -214,12 +231,10 @@ PC12.Signal=I2S3_SD
 PC14-OSC32_IN.GPIOParameters=GPIO_Label
 PC14-OSC32_IN.GPIO_Label=PC14-OSC32_IN
 PC14-OSC32_IN.Locked=true
-PC14-OSC32_IN.Mode=LSE-External-Oscillator
 PC14-OSC32_IN.Signal=RCC_OSC32_IN
 PC15-OSC32_OUT.GPIOParameters=GPIO_Label
 PC15-OSC32_OUT.GPIO_Label=PC15-OSC32_OUT
 PC15-OSC32_OUT.Locked=true
-PC15-OSC32_OUT.Mode=LSE-External-Oscillator
 PC15-OSC32_OUT.Signal=RCC_OSC32_OUT
 PC2.Mode=Full_Duplex_Master
 PC2.Signal=I2S2_ext_SD
@@ -294,12 +309,10 @@ PE5.Signal=GPXTI5
 PH0\ -\ OSC_IN.GPIOParameters=GPIO_Label
 PH0\ -\ OSC_IN.GPIO_Label=PH0-OSC_IN
 PH0\ -\ OSC_IN.Locked=true
-PH0\ -\ OSC_IN.Mode=HSE-External-Clock-Source
 PH0\ -\ OSC_IN.Signal=RCC_OSC_IN
 PH1\ -\ OSC_OUT.GPIOParameters=GPIO_Label
 PH1\ -\ OSC_OUT.GPIO_Label=PH1-OSC_OUT
 PH1\ -\ OSC_OUT.Locked=true
-PH1\ -\ OSC_OUT.Mode=HSE-External-Clock-Source
 PH1\ -\ OSC_OUT.Signal=RCC_OSC_OUT
 PinOutPanel.RotationAngle=0
 ProjectManager.AskForMigrate=true
@@ -329,12 +342,12 @@ ProjectManager.StackSize=0x400
 ProjectManager.TargetToolchain=STM32CubeIDE
 ProjectManager.ToolChainLocation=
 ProjectManager.UnderRoot=true
-ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_I2C1_Init-I2C1-false-HAL-true,4-MX_I2S2_Init-I2S2-false-HAL-true,5-MX_I2S3_Init-I2S3-false-HAL-true,6-MX_SPI1_Init-SPI1-false-HAL-true,7-MX_USB_HOST_Init-USB_HOST-false-HAL-false
+ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_I2C1_Init-I2C1-false-HAL-true,4-MX_I2S2_Init-I2S2-false-HAL-true,5-MX_I2S3_Init-I2S3-false-HAL-true,6-MX_SPI1_Init-SPI1-false-HAL-true,7-MX_SDIO_SD_Init-SDIO-false-HAL-true,8-MX_DMA_Init-DMA-false-HAL-true,9-MX_USB_DEVICE_Init-USB_DEVICE-false-HAL-false,10-MX_FATFS_Init-FATFS-false-HAL-false
 RCC.48MHZClocksFreq_Value=48000000
 RCC.AHBFreq_Value=96000000
-RCC.APB1CLKDivider=RCC_HCLK_DIV4
-RCC.APB1Freq_Value=24000000
-RCC.APB1TimFreq_Value=48000000
+RCC.APB1CLKDivider=RCC_HCLK_DIV2
+RCC.APB1Freq_Value=48000000
+RCC.APB1TimFreq_Value=96000000
 RCC.APB2Freq_Value=96000000
 RCC.APB2TimFreq_Value=96000000
 RCC.CortexFreq_Value=96000000
@@ -345,16 +358,17 @@ RCC.HCLKFreq_Value=96000000
 RCC.HSE_VALUE=8000000
 RCC.HSI_VALUE=16000000
 RCC.I2SClocksFreq_Value=160000000
-RCC.IPParameters=48MHZClocksFreq_Value,AHBFreq_Value,APB1CLKDivider,APB1Freq_Value,APB1TimFreq_Value,APB2Freq_Value,APB2TimFreq_Value,CortexFreq_Value,EthernetFreq_Value,FCLKCortexFreq_Value,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI_VALUE,I2SClocksFreq_Value,LSI_VALUE,MCO2PinFreq_Value,PLLCLKFreq_Value,PLLI2SM,PLLI2SN,PLLM,PLLP,PLLQ,PLLQCLKFreq_Value,RTCFreq_Value,RTCHSEDivFreq_Value,SYSCLKFreq_VALUE,SYSCLKSource,VCOI2SOutputFreq_Value,VCOInputFreq_Value,VCOInputMFreq_Value,VCOOutputFreq_Value,VcooutputI2S
+RCC.IPParameters=48MHZClocksFreq_Value,AHBFreq_Value,APB1CLKDivider,APB1Freq_Value,APB1TimFreq_Value,APB2Freq_Value,APB2TimFreq_Value,CortexFreq_Value,EthernetFreq_Value,FCLKCortexFreq_Value,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI_VALUE,I2SClocksFreq_Value,LSI_VALUE,MCO2PinFreq_Value,PLLCLKFreq_Value,PLLI2SM,PLLI2SN,PLLM,PLLP,PLLQ,PLLQCLKFreq_Value,PLLSourceVirtualString,RTCFreq_Value,RTCHSEDivFreq_Value,SYSCLKFreq_VALUE,SYSCLKSource,VCOI2SOutputFreq_Value,VCOInputFreq_Value,VCOInputMFreq_Value,VCOOutputFreq_Value,VcooutputI2S
 RCC.LSI_VALUE=32000
 RCC.MCO2PinFreq_Value=96000000
 RCC.PLLCLKFreq_Value=96000000
-RCC.PLLI2SM=5
+RCC.PLLI2SM=10
 RCC.PLLI2SN=200
-RCC.PLLM=4
+RCC.PLLM=8
 RCC.PLLP=RCC_PLLP_DIV4
 RCC.PLLQ=8
 RCC.PLLQCLKFreq_Value=48000000
+RCC.PLLSourceVirtualString=RCC_PLLSOURCE_HSI
 RCC.RTCFreq_Value=32000
 RCC.RTCHSEDivFreq_Value=4000000
 RCC.SYSCLKFreq_VALUE=96000000