stm32756g_eval_audio.c File Reference

This file provides the Audio driver for the STM32756G-EVAL and STM32746G_EVAL evaluation board. More...

#include "stm32756g_eval_audio.h"

Go to the source code of this file.

Functions
static void	CODEC_Reset (void)
	Resets the audio codec.
static void	SAIx_Init (uint32_t AudioFreq)
	Initializes the Audio Codec audio interface (SAI).
static void	SAIx_DeInit (void)
	Deinitializes the Audio Codec audio interface (SAI).
static void	I2Sx_Init (uint32_t AudioFreq)
	Initializes the Audio Codec audio interface (I2S)
static void	I2Sx_DeInit (void)
	Deinitializes the Audio Codec audio interface (I2S).
static void	TIMx_IC_MspInit (TIM_HandleTypeDef *htim)
	Initializes the TIM INput Capture MSP.
static void	TIMx_IC_MspDeInit (TIM_HandleTypeDef *htim)
	Initializes the TIM INput Capture MSP.
static void	TIMx_Init (void)
	Configure TIM as a clock divider by 2.
static void	TIMx_DeInit (void)
	Configure TIM as a clock divider by 2.
static void	PDMDecoder_Init (uint32_t AudioFreq, uint32_t ChnlNbr)
	Initializes the PDM library.
uint8_t	BSP_AUDIO_OUT_Init (uint16_t OutputDevice, uint8_t Volume, uint32_t AudioFreq)
	Configures the audio peripherals.
uint8_t	BSP_AUDIO_OUT_Play (uint16_t *pBuffer, uint32_t Size)
	Starts playing audio stream from a data buffer for a determined size.
void	BSP_AUDIO_OUT_ChangeBuffer (uint16_t *pData, uint16_t Size)
	Sends n-Bytes on the SAI interface.
uint8_t	BSP_AUDIO_OUT_Pause (void)
	This function Pauses the audio file stream.
uint8_t	BSP_AUDIO_OUT_Resume (void)
	This function Resumes the audio file stream.
uint8_t	BSP_AUDIO_OUT_Stop (uint32_t Option)
	Stops audio playing and Power down the Audio Codec.
uint8_t	BSP_AUDIO_OUT_SetVolume (uint8_t Volume)
	Controls the current audio volume level.
uint8_t	BSP_AUDIO_OUT_SetMute (uint32_t Cmd)
	Enables or disables the MUTE mode by software.
uint8_t	BSP_AUDIO_OUT_SetOutputMode (uint8_t Output)
	Switch dynamically (while audio file is played) the output target (speaker or headphone).
void	BSP_AUDIO_OUT_SetFrequency (uint32_t AudioFreq)
	Updates the audio frequency.
void	BSP_AUDIO_OUT_SetAudioFrameSlot (uint32_t AudioFrameSlot)
	Updates the Audio frame slot configuration.
void	BSP_AUDIO_OUT_DeInit (void)
	Deinit the audio peripherals.
void	HAL_SAI_TxCpltCallback (SAI_HandleTypeDef *hsai)
	Tx Transfer completed callbacks.
void	HAL_SAI_TxHalfCpltCallback (SAI_HandleTypeDef *hsai)
	Tx Half Transfer completed callbacks.
void	HAL_SAI_ErrorCallback (SAI_HandleTypeDef *hsai)
	SAI error callbacks.
__weak void	BSP_AUDIO_OUT_TransferComplete_CallBack (void)
	Manages the DMA full Transfer complete event.
__weak void	BSP_AUDIO_OUT_HalfTransfer_CallBack (void)
	Manages the DMA Half Transfer complete event.
__weak void	BSP_AUDIO_OUT_Error_CallBack (void)
	Manages the DMA FIFO error event.
__weak void	BSP_AUDIO_OUT_MspInit (SAI_HandleTypeDef *hsai, void *Params)
	Initializes BSP_AUDIO_OUT MSP.
__weak void	BSP_AUDIO_OUT_MspDeInit (SAI_HandleTypeDef *hsai, void *Params)
	Deinitializes SAI MSP.
__weak void	BSP_AUDIO_OUT_ClockConfig (SAI_HandleTypeDef *hsai, uint32_t AudioFreq, void *Params)
	Clock Config.
uint8_t	BSP_AUDIO_IN_Init (uint32_t AudioFreq, uint32_t BitRes, uint32_t ChnlNbr)
	Initializes wave recording.
uint8_t	BSP_AUDIO_IN_Record (uint16_t *pbuf, uint32_t size)
	Starts audio recording.
uint8_t	BSP_AUDIO_IN_Stop (void)
	Stops audio recording.
uint8_t	BSP_AUDIO_IN_Pause (void)
	Pauses the audio file stream.
uint8_t	BSP_AUDIO_IN_Resume (void)
	Resumes the audio file stream.
uint8_t	BSP_AUDIO_IN_SetVolume (uint8_t Volume)
	Controls the audio in volume level.
void	BSP_AUDIO_IN_DeInit (void)
	Deinit the audio IN peripherals.
uint8_t	BSP_AUDIO_IN_PDMToPCM (uint16_t *PDMBuf, uint16_t *PCMBuf)
	Converts audio format from PDM to PCM.
void	HAL_I2S_RxCpltCallback (I2S_HandleTypeDef *hi2s)
	Rx Transfer completed callbacks.
void	HAL_I2S_RxHalfCpltCallback (I2S_HandleTypeDef *hi2s)
	Rx Half Transfer completed callbacks.
void	HAL_I2S_ErrorCallback (I2S_HandleTypeDef *hi2s)
	I2S error callbacks.
__weak void	BSP_AUDIO_IN_TransferComplete_CallBack (void)
	User callback when record buffer is filled.
__weak void	BSP_AUDIO_IN_HalfTransfer_CallBack (void)
	Manages the DMA Half Transfer complete event.
__weak void	BSP_AUDIO_IN_Error_Callback (void)
	Audio IN Error callback function.
__weak void	BSP_AUDIO_IN_MspInit (I2S_HandleTypeDef *hi2s, void *Params)
	Initializes BSP_AUDIO_IN MSP.
__weak void	BSP_AUDIO_IN_MspDeInit (I2S_HandleTypeDef *hi2s, void *Params)
	DeInitializes BSP_AUDIO_IN MSP.
Variables
AUDIO_DrvTypeDef *	audio_drv
SAI_HandleTypeDef	haudio_out_sai
I2S_HandleTypeDef	haudio_in_i2s
TIM_HandleTypeDef	haudio_tim
PDMFilter_InitStruct	Filter [2]
uint8_t	Channel_Demux [128]
uint16_t __IO	AudioInVolume = DEFAULT_AUDIO_IN_VOLUME

---

Detailed Description

This file provides the Audio driver for the STM32756G-EVAL and STM32746G_EVAL evaluation board.

Author:

MCD Application Team

Version:

V1.0.0

Date:

22-May-2015

  How To use this driver:
  -----------------------
   + This driver supports STM32F7xx devices on STM32756G-EVAL (MB1167) Evaluation boards.
   + Call the function BSP_AUDIO_OUT_Init(
                                    OutputDevice: physical output mode (OUTPUT_DEVICE_SPEAKER, 
                                                  OUTPUT_DEVICE_HEADPHONE 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, SAI, 
      GPIOs, DMA and interrupt if needed). This function returns AUDIO_OK if configuration is OK.
      If the returned value is different from AUDIO_OK or the function is stuck then the communication with
      the codec or the MFX has failed (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_BOTH     : both Speaker and Headphone are used as outputs for the audio stream
                                 at the same time.
      Note. On STM32756G-EVAL SAI_DMA is configured in CIRCULAR mode. Due to this the application
        does NOT need to call BSP_AUDIO_OUT_ChangeBuffer() to assure streaming.
   + Call the function BSP_EVAL_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 AUDIO_OUT_XXX_CallBack() and only their prototypes are declared in 
      the stm32756g_eval_audio.h file. (refer to the example for more details on the callbacks implementations)
   + To Stop playing, to modify the volume level, the frequency, the audio frame slot, 
      the device output mode the mute or the stop, use the functions: BSP_AUDIO_OUT_SetVolume(), 
      AUDIO_OUT_SetFrequency(), BSP_AUDIO_OUT_SetAudioFrameSlot(), BSP_AUDIO_OUT_SetOutputMode(),
      BSP_AUDIO_OUT_SetMute() and BSP_AUDIO_OUT_Stop().
   + The driver API and the callback functions are at the end of the stm32756g_eval_audio.h file.
 
  Driver architecture:
  --------------------
   + This driver provides the High Audio Layer: consists of the function API exported in the stm32756g_eval_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 stm32756g_eval_audio_codec.c file (I2Sx_Init(), I2Sx_DeInit(), SAIx_Init() and SAIx_DeInit())

  Known Limitations:
  ------------------
   1- If the TDM Format used to play in parallel 2 audio Stream (the first Stream is configured in codec SLOT0 and second 
      Stream in SLOT1) the Pause/Resume, volume and mute feature will control the both streams.
   2- 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.
   3- Supports only Stereo audio streaming.
   4- Supports only 16-bits audio data size.
  

Attention:

© COPYRIGHT(c) 2015 STMicroelectronics

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.

Definition in file stm32756g_eval_audio.c.