PDMA

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mfkihc|

楼主 | 2013-9-9 11:19 | 只看该作者回帖奖励

|倒序浏览 |阅读模式

pd, DMA, UART, UART0, se

哪位大虾帮我看下这个初始化程序，串口发送数据后由DMA自动填入内存中，DMA每重载一次地址时都会固定的丢掉两个字节的数据，初始化程序如下void LinUart0_Init(void)

{

      STR_PDMA_T sPDMA;

      unsigned short a;

      /* Select UART Clock Source From 12Mhz*/

      SYS_SelectIPClockSource_1(CLK_CLKSEL1_UART_MASK, CLK_CLKSEL1_UART_HXT);

      MFP_UART0_TO_PORTB();// PB4-Rx1 PB5-Tx1

      CLK->APBCLK |= CLK_APBCLK_UART0_EN; /* Enable UART0 clock */

      CLK->CLKDIV0 &= ~CLK_CLKDIV0_UART_MASK;

      CLK->CLKSEL1 = (CLK->CLKSEL1 & ~CLK_CLKSEL1_UART_MASK) | CLK_CLKSEL1_UART_HXT;  /* Select 12 Mhz XTAL */

      UART0->BAUD =15;                   /* Baud Rate:230400  OSC:12MHz */

      UART0->TLCTL = 0x03;                /* Character len is 8 bits */

#if 1

      /* CH3: Uart0 RX */

      PDMA_EnableChannelClock(PDMAGCR_CSR_CLK3);/* Enable Channel 2 Clock */

      sPDMA.SrcAddr  = (uint32_t)&(UART0->RBR);

sPDMA.DestAddr = (uint32_t)&RecPlayBuff[0];

      sPDMA.SrcCtrl  = PDMA_CSR_SAD_FIX; //源地址固定

      sPDMA.DestCtrl = PDMA_CSR_DAD_WRAP;

   sPDMA.TransWidth = PDMA_CSR_APB_TWS_8BIT;

      sPDMA.Mode = PDMA_CSR_IP2MEM;

      //共接收的字节数

      sPDMA.ByteCnt  = 5120;

      sPDMA.IsTimeOutEnable = 0;

      PDMA_Open(PDMA3, &sPDMA);

      PDMA_UART0_RX_TO_CH3();

      UART_EnablePDMA(UART0);

      PDMA_CHEnableTransfer(PDMA3);

#endif

}

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