DMA问题

FSL_FAE_MIKE

简单的dma测试程序，但是与预想的结果不一样；
定义了两个数组
unsigned long dma_tx_buffer[260*10] = {0};
unsigned long dma_rx_buffer[260*10] = {0};
就是想正常的搬数；
void dma_init(void)
{
  unsigned char i;
  //打开DMA模块时钟
  SIM_SCGC7 |= SIM_SCGC7_DMA_MASK;                         
  SIM_SCGC6 |= SIM_SCGC6_DMAMUX_MASK;
 
  DMA_MUX0_CHCONFIG15 = 0x00;
  DMA_MUX0_CHCONFIG14 = 0x00;
  //DMA_MUX0_CHCONFIG13 = 0x00;
  //DMA_MUX0_CHCONFIG12 = 0x00;
     
  //EDMA_ERQL = 0x0000F000;  // Enable DMA request 15,14,13,12
  EDMA_ERQL = 0x00008000;  // Enable DMA request 15,14
  DMA_MUX0_CHCONFIG15 = 0x3A;
  i = 15;
  //源地址        
  EDMA_TCD_SADDR(i) = (unsigned long)dma_tx_buffer;
  //源数据传输大小为32bit,目标数据传输大小为32bit 
  EDMA_TCD_ATTR(i) = EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT ;
  //源地址偏移大小                               
  EDMA_TCD_SOFF(i) = 0x04;
  //字节传输数量 
  EDMA_TCD_NBYTES(i) = 4;
  //调整源地址值 
  EDMA_TCD_SLAST(i) = 0x0;
  //目标地址 
  //EDMA_TCD_DADDR(i) = (unsigned long)&SPI1_PUSHR;
  EDMA_TCD_DADDR(i) = (unsigned long)dma_rx_buffer;
  //当前主要循环计数 
  EDMA_TCD_CITER(i) = EDMA_TCD_CITER_CITER(10);
  //目标地址偏移大小                                       
  EDMA_TCD_DOFF(i) = 0x04;
  //调整目标地址值0-module-32-byte                                               
  EDMA_TCD_DLAST_SGA(i) = 0x0;
  //重新加载CITER值 
  EDMA_TCD_BITER(i) = EDMA_TCD_BITER_BITER(10);
  // 
  //EDMA_TCD_CSR(i) = DMA_CSR_DREQ_MASK | DMA_CSR_INTMAJOR_MASK;
  EDMA_TCD_CSR(i) = DMA_CSR_INTMAJOR_MASK;
  //DMA_MUX0_CHCONFIG15 |= 0x80;
}
只想让它搬运10个数；但是似乎搬了很多个数据，搞不太懂；

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安

我对M4的DMA也不是很熟悉，我研究一下，您别着急啊。