使用307的I2S3连接CS43L22播放SD卡中的WAV，能正常3秒左右，后面就是杂音了。用调试器跟踪SD读取数据是正确的，现在找不到原因，
static void i2s3_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure={0};
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC, ENABLE);
GPIO_PinRemapConfig( GPIO_Remap_SWJ_JTAGDisable, ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_3 | GPIO_Pin_5;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void i2s_open(uint16_t *audio_buffer, uint16_t buffer_size,
uint32_t sample_rate, uint32_t frame_format) {
I2S_InitTypeDef I2S_InitStructure = { 0 };
DMA_InitTypeDef DMA_InitStructure = { 0 };
NVIC_InitTypeDef NVIC_InitStructure={0};
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA2, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Channel2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_DeInit(DMA2_Channel2);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &SPI3->DATAR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) audio_buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = buffer_size;
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_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA2_Channel2, &DMA_InitStructure);
DMA_ITConfig(DMA2_Channel2, DMA_IT_TC | DMA_IT_HT, ENABLE);
DMA_ClearFlag(DMA2_FLAG_TC2 | DMA2_FLAG_HT2);
I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;
I2S_InitStructure.I2S_Standard = I2S_Standard_Phillips;
I2S_InitStructure.I2S_DataFormat = frame_format;
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Enable;
I2S_InitStructure.I2S_AudioFreq = sample_rate;
I2S_InitStructure.I2S_CPOL = I2S_CPOL_High;
I2S_Init(SPI3, &I2S_InitStructure);
/* SPI DMA enable */
SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx, ENABLE);
I2S_Cmd(SPI3, ENABLE);
DMA_Cmd(DMA2_Channel2, ENABLE);
}
void DMA2_Channel2_IRQHandler(void) {
if (DMA_GetITStatus(DMA2_FLAG_TC2)) {
DMA_ClearFlag(DMA2_FLAG_TC2);
free_buffer = 1;
read_flag = 1;
}
if (DMA_GetITStatus(DMA2_FLAG_HT2)) {
DMA_ClearFlag(DMA2_FLAG_HT2);
free_buffer = 0;
read_flag = 1;
}
}