STM32CubeIDE Audio播放音频，DAC + TIM + DMA

/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  Start wave playing

  * @param  None

  * @retval None

  */

uint8_t WavePlayerMenu_Start(uint8_t *DirName, uint8_t *FileName, uint32_t *FileLen)

{

  DAC_InitTypeDef            DAC_InitStructure;

  DMA_InitTypeDef            DMA_InitStructure;

  uint32_t var;

  uint8_t tmp, KeyState = NOKEY;

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

 

  WaveFileStatus = Unvalid_RIFF_ID;

 

  /* TIM6 Configuration */

  TIM_DeInit(TIM6);

 

  /* DMA1 channel3 configuration */

  DMA_DeInit(DMA1_Channel3);

  DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHLCD_REG_8LCD_REG_1_ADDRESS;

  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) & Wavebuffer;

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;

  DMA_InitStructure.DMA_BufferSize = 512;

  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;

  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;

  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;

  DMA_InitStructure.DMA_Priority = DMA_Priority_High;

  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

  DMA_Init(DMA1_Channel3, &DMA_InitStructure);

 

  /* Enable DMA1 Channel3 */

  DMA_Cmd(DMA1_Channel3, ENABLE);

 

  /* DAC deinitialize */

  DAC_DeInit();

  DAC_StructInit(&DAC_InitStructure);

 

  /* Fill DAC InitStructure */

  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;

  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;

  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;

 

/* DAC Channel1: 8bit right---------------------------------------------------*/

  /* DAC Channel1 Init */

  DAC_Init(DAC_Channel_1, &DAC_InitStructure);

  /* Enable DAC Channel1: Once the DAC channel1 is enabled, PA.04 is

     automatically connected to the DAC converter. */

  DAC_Cmd(DAC_Channel_1, ENABLE);

  /* Enable DMA for DAC Channel1 */

  DAC_DMACmd(DAC_Channel_1, ENABLE);

 

  /* Read the Speech wave file status */

  WaveFileStatus = WavePlayer_WaveParsing(DirName, FileName, &wavelen);

 

  /* TIM6 TRGO selection */

  TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);

  TIM_SetAutoreload(TIM6, TIM6ARRValue);

 

  if (WaveFileStatus == Valid_WAVE_File)  /* the .WAV file is valid */

  {

    /* Set WaveDataLenght to the Speech wave length */

    WaveDataLength = WAVE_Format.DataSize;

  }

  else

  {

    return NOKEY;

  }

  

  /* Start TIM6 */

  TIM_Cmd(TIM6, ENABLE);

 

  LCD_SetTextColor(LCD_COLOR_MAGENTA);

  /* Set the Back Color */

  LCD_SetBackColor(LCD_COLOR_BLUE);

  LCD_DrawRect(LCD_LINE_7, 310, 16, 300);

 

  while (WaveDataLength)

  {

    DFS_ReadFile(&fiwave, sector, Wavebuffer2, &var, SECTOR_SIZE);

    if (WaveDataLength) WaveDataLength -= 512;

    if (WaveDataLength < 512) WaveDataLength = 0;

    while (DMA_GetFlagStatus(DMA1_FLAG_TC3) == RESET)

    {

    }

    DMA1->IFCR = DMA1_FLAG_TC3;

    DMA1_Channel3->CCR = 0x0;

 

    DMA1_Channel3->CNDTR = 0x200;

    DMA1_Channel3->CPAR = 0x40007410;

    DMA1_Channel3->CMAR = (uint32_t) & Wavebuffer2;

    DMA1_Channel3->CCR = 0x2091;

 

    DFS_ReadFile(&fiwave, sector, Wavebuffer, &var, SECTOR_SIZE);

    if (WaveDataLength) WaveDataLength -= 512;

    if (WaveDataLength < 512) WaveDataLength = 0;

    

    while (DMA_GetFlagStatus(DMA1_FLAG_TC3) == RESET)

    {

    }

    DMA1->IFCR = DMA1_FLAG_TC3;

    DMA1_Channel3->CCR = 0x0;

 

    DMA1_Channel3->CNDTR = 0x200;

    DMA1_Channel3->CPAR = 0x40007410;

    DMA1_Channel3->CMAR = (uint32_t) & Wavebuffer;

    DMA1_Channel3->CCR = 0x2091;

  }

  DMA1_Channel3->CCR = 0x0;

  

  /* Disable TIM6 */

  TIM_Cmd(TIM6, DISABLE);

  WaveDataLength = 0;

  

  return NOKEY;

}