I2S2 已经作为输出用了,现在需要I2S3作为输入连接ADC, 设置好后发现读出的数据都是0, 怀疑其没有工作,后来将I2S3设为输出并增加上中断,发现进不了中断,I2S2是工作正常的,I2S3就多了remap,有没有遇到类似问题的?多谢!
 
void I2S_In_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  I2S_InitTypeDef I2S_InitStructure;
   
  /* Enable GPIOA, GPIOC and AFIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC |
                         RCC_APB2Periph_AFIO, ENABLE);
  
  /* Enable I2S3 APB1 clock */
  //RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
 
  /* I2S3 MCLK,SD, SCLK pins configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_10 | GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  
  /* I2S2 WS LRCK pin configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
    /* remap */
  GPIO_PinRemapConfig(GPIO_Remap_SPI3, ENABLE);   
  /* Enable I2S2 APB1 clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
 
  /* Deinitialize SPI3 peripheral */
  SPI_I2S_DeInit(SPI3);
  /* I2S2 peripheral configuration */
  I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;
  I2S_InitStructure.I2S_Standard = I2S_Standard_Phillips;
  I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;
  I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Enable;
  I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_44k;
  I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
  I2S_Init(SPI3, &I2S_InitStructure);
  /* Enable the SPI3/I2S peripheral */
  I2S_Cmd(SPI3, ENABLE);
}
 
 
void I2S_In_DMA_Config(void)
{ 
  /* I2S3  DMA2 Channel Config */
  /* Peripheral control structures */
  DMA_InitTypeDef DMA_InitStructure;
  NVIC_InitTypeDef NVIC_DMA2_Channel2;
 
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)PCMBuffer1;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPI3_DR_Address;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 1;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
 
  NVIC_DMA2_Channel2.NVIC_IRQChannel = DMA2_Channel2_IRQn;
  NVIC_DMA2_Channel2.NVIC_IRQChannelPreemptionPriority = 0x01;
  NVIC_DMA2_Channel2.NVIC_IRQChannelSubPriority = 0x00;
  NVIC_DMA2_Channel2.NVIC_IRQChannelCmd = ENABLE;
 
  /* Initialize the DMA2 Channel2 to its default values */
  DMA_DeInit(DMA2_Channel2);
 
  /* Configure the DMA parameters */
  DMA_Init(DMA2_Channel2, (DMA_InitTypeDef *) &DMA_InitStructure);
 
  NVIC_Init((NVIC_InitTypeDef *)&NVIC_DMA2_Channel2);
 
  DMA_ClearFlag(DMA2_FLAG_GL2);
  DMA_ITConfig(DMA2_Channel2, DMA_IT_TC, ENABLE);
 
  /* Enable DMA2 Channel2 */
  DMA_Cmd(DMA2_Channel2, ENABLE);
 
  /* Enable I2S DMA request for TX */
  SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx, ENABLE);
}

 
 

忘记开启DMA的RCC了,结贴