/**
* @brief Stops audio stream playing on the used Media.
* @param None.
* @retval None.
*/
void Audio_MAL_Stop(void)
{
/* Stop the Transfer on the I2S side: Stop and disable the DMA stream */
DMA_Cmd(AUDIO_MAL_DMA_CHANNEL, DISABLE);
/* Clear all the DMA flags for the next transfer */
DMA_ClearFlag(AUDIO_MAL_DMA_FLAG_ALL);
/* Stop the current DMA request by resetting the I2S cell */
Codec_AudioInterface_DeInit();
/* Re-configure the I2S interface for the next paly operation */
Codec_AudioInterface_Init(I2S_InitStructure.I2S_AudioFreq);
}
/**
* @brief Stops audio stream playing on the used Media.
* @param None.
* @retval None.
*/
void Audio_MAL_Stop(void)
{
/* Stop the Transfer on the I2S side: Stop and disable the DMA stream */
DMA_Cmd(AUDIO_MAL_DMA_STREAM, DISABLE);
/* Clear all the DMA flags for the next transfer */
DMA_ClearFlag(AUDIO_MAL_DMA_STREAM, AUDIO_MAL_DMA_FLAG_TC |AUDIO_MAL_DMA_FLAG_HT | \
AUDIO_MAL_DMA_FLAG_FE | AUDIO_MAL_DMA_FLAG_TE);
/* Wait the DMA Stream to be effectively disabled */
while (DMA_GetCmdStatus(AUDIO_MAL_DMA_STREAM) != DISABLE)
{}
/* Stop the current DMA request by resetting the I2S cell */
Codec_AudioInterface_DeInit();
/* Re-configure the I2S interface for the next paly operation */
Codec_AudioInterface_Init(I2S_InitStructure.I2S_AudioFreq);
}
/**
* @brief Restore the audio codec state to default state and free all used
* resources.
* @param None.
* @retval o if correct communication, else wrong communication
*/
uint32_t Codec_DeInit(void)
{
uint32_t counter = 0;
/* Reset the Codec Registers */
Codec_Reset();
/* Keep Codec powered OFF */
counter += Codec_WriteRegister(0x02, 0x01);
/* Deinitialize all use GPIOs */
Codec_GPIO_DeInit();
/* Disable the Codec control interface */
Codec_CtrlInterface_DeInit();
/* Deinitialize the Codec audio interface (I2S) */
Codec_AudioInterface_DeInit();
/* Return communication control value */
return counter;
}
/**
* @brief Pauses or Resumes the audio stream playing from the Media.
* @param Cmd: AUDIO_PAUSE (or 0) to pause, AUDIO_RESUME (or any value different
* from 0) to resume.
* @param Addr: Address from/at which the audio stream should resume/pause.
* @param Size: Number of data to be configured for next resume.
* @retval None.
*/
void Audio_MAL_PauseResume(uint32_t Cmd, uint32_t Addr, uint32_t Size)
{
/* Pause the audio file playing */
if (Cmd == AUDIO_PAUSE)
{
/* Stop the current DMA request by resetting the I2S cell */
Codec_AudioInterface_DeInit();
/* Re-configure the I2S interface for the next resume operation */
Codec_AudioInterface_Init(I2S_InitStructure.I2S_AudioFreq);
/* Disable the DMA Stream */
DMA_Cmd(AUDIO_MAL_DMA_CHANNEL, DISABLE);
/* Clear the Interrupt flag */
DMA_ClearFlag(AUDIO_MAL_DMA_FLAG_ALL);
}
else /* AUDIO_RESUME */
{
/* Configure the buffer address and size */
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Addr;
DMA_InitStructure.DMA_BufferSize = (uint32_t)(Size*2);
/* Configure the DMA Stream with the new parameters */
DMA_Init(AUDIO_MAL_DMA_CHANNEL, &DMA_InitStructure);
/* Enable the I2S DMA Stream*/
DMA_Cmd(AUDIO_MAL_DMA_CHANNEL, ENABLE);
/* If the I2S peripheral is still not enabled, enable it */
if ((CODEC_I2S->I2SCFGR & I2S_ENABLE_MASK) == 0)
{
I2S_Cmd(CODEC_I2S, ENABLE);
}
}
}
/**
* @brief Pauses or Resumes the audio stream playing from the Media.
* @param Cmd: AUDIO_PAUSE (or 0) to pause, AUDIO_RESUME (or any value different
* from 0) to resume.
* @param Addr: Address from/at which the audio stream should resume/pause.
* @param Size: Number of data to be configured for next resume.
* @retval None.
*/
void Audio_MAL_PauseResume(uint32_t Cmd, uint32_t Addr, uint32_t Size)
{
/* Pause the audio file playing */
if (Cmd == AUDIO_PAUSE)
{
#ifdef USE_DMA_PAUSE_FEATURE
/* Disable the I2S peripheral */
I2S_Cmd(CODEC_I2S, DISABLE);
/* Pause the I2S DMA Stream
Note. For the STM32F4xx devices, the DMA implements a pause feature,
by disabling the stream, all configuration is preserved and data
transfer is paused till the next enable of the stream.
This feature is not available on STM32F1xx devices. */
DMA_Cmd(AUDIO_MAL_DMA_STREAM, DISABLE);
#else /* #if !defined(USE_DMA_PAUSE_FEATURE) */
/* Stop the current DMA request by resetting the I2S cell */
Codec_AudioInterface_DeInit();
/* Re-configure the I2S interface for the next resume operation */
Codec_AudioInterface_Init(I2S_InitStructure.I2S_AudioFreq);
/* Disable the DMA Stream */
DMA_Cmd(AUDIO_MAL_DMA_STREAM, DISABLE);
/* Wait the DMA Stream to be effectively disabled */
while (DMA_GetCmdStatus(AUDIO_MAL_DMA_STREAM) != DISABLE)
{}
/* Clear the Interrupt flag */
DMA_ClearFlag(AUDIO_MAL_DMA_STREAM, AUDIO_MAL_DMA_FLAG_ALL);
#endif /* USE_DMA_PAUSE_FEATURE */
}
else /* AUDIO_RESUME */
{
#ifdef USE_DMA_PAUSE_FEATURE
/* Resume the I2S DMA Stream
Note. For the STM32F4xx devices, the DMA implements a pause feature,
by disabling the stream, all configuration is preserved and data
transfer is paused till the next enable of the stream.
This feature is not available on STM32F1xx devices. */
DMA_Cmd(AUDIO_MAL_DMA_STREAM, ENABLE);
#else
/* Configure the buffer address and size */
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Addr;
DMA_InitStructure.DMA_BufferSize = (uint32_t)(Size*2);
/* Configure the DMA Stream with the new parameters */
DMA_Init(AUDIO_MAL_DMA_STREAM, &DMA_InitStructure);
/* Enable the I2S DMA Stream*/
DMA_Cmd(AUDIO_MAL_DMA_STREAM, ENABLE);
#endif /* USE_DMA_PAUSE_FEATURE */
/* If the I2S peripheral is still not enabled, enable it */
if ((CODEC_I2S->I2SCFGR & I2S_ENABLE_MASK) == 0)
{
I2S_Cmd(CODEC_I2S, ENABLE);
}
}
}
