如何启动DMA

1万 · 2013-2-28 21:11

TMS320F28335的PERINTFRC如何启动DMA?

1万 · 2013-2-28 21:11

#pragma DATA_SECTION(DMABuf1,"DMARAML4");
#pragma DATA_SECTION(DMABuf2,"DMARAML5");

volatile Uint16 DMABuf1[1024];
volatile Uint16 DMABuf2[1024];

volatile Uint16 *DMADest;
volatile Uint16 *DMASource;
Uint16 i,j;
//interrupt void local_DINTCH1_ISR(void);

void main(void)
{
Uint16 i;
      InitSysCtrl();
InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
IER = 0x0000;
IFR = 0x0000;

      DMAInitialize();

      // Initialize Tables
for (i=0; i<BUF_SIZE; i++)
{
   DMABuf1[i] = 0;
      DMABuf2[i] = i;
}


// Configure DMA Channel
DMADest = &DMABuf1[0];
      DMASource = &DMABuf2[0];
         DMACH1AddrConfig(DMADest,DMASource);
      DMACH1BurstConfig(31,2,2);       //Will set up to use 32-bit datasize, pointers are based on 16-bit words
      DMACH1TransferConfig(31,2,2);    //so need to increment by 2 to grab the correct location
      DMACH1WrapConfig(0xFFFF,0,0xFFFF,0);

// DMACH1ModeConfig(0,PERINT_ENABLE,ONESHOT_ENABLE,CONT_DISABLE,SYNC_DISABLE,SYNC_SRC,OVRFLOW_DISABLE,THIRTYTWO_BIT,CHINT_END,0);

DmaRegs.CH1.MODE.bit.ONESHOT=1;
      DmaRegs.CH1.MODE.bit.DATASIZE=1;


DmaRegs.CH1.MODE.bit.PERINTSEL=0;
DmaRegs.CH1.CONTROL.bit.PERINTFRC=1;
      DmaRegs.CH1.MODE.bit.PERINTE=1;
// Clear any spurious flags:
      DmaRegs.CH1.CONTROL.bit.PERINTCLR = 1;                // Clear any spurious interrupt flags
      DmaRegs.CH1.CONTROL.bit.SYNCCLR = 1;                   // Clear any spurious sync flags
      DmaRegs.CH1.CONTROL.bit.ERRCLR = 1;

      StartDMACH1();


while(1)
      {

                  DmaRegs.CH1.CONTROL.bit.PERINTFRC = 1;
                     j = 0;
               if(DmaRegs.CH1.CONTROL.bit.PERINT标志寄存器==1)
                     j = 1;

                     for(i=0;i<1000;i++);
                     i=0;

      }

}

我设置了PERINTFRC = 1，但是始终也没检测到PERINT标志寄存器=1的情况。

1万 · 2013-2-28 21:13

楼主详细说说

1万 · 2013-2-28 21:13

就是说虽然给定了PERINTFRC =1，但是PERINTFRC =1事件并没有让PERINT标志寄存器=1，从而没有启动DMA.

1万 · 2013-2-28 21:15

感觉你的初始化程序是哪儿没设置好

1万 · 2013-2-28 21:15

这个对我这个菜鸟来说有点高难度，帮你顶上去吧。

2万 · 2013-2-28 21:35

我也不太懂，不过PERINTFRC是受保护的--
你这样试试，或许能行：
EALLOW;
DmaRegs.CH1.CONTROL.bit.PERINTFRC=1;
EDIS;

1万 · 2013-2-28 21:35

试一下楼上说的

1万 · 2013-2-28 21:38

好的，结贴了

1万 · 2013-2-28 21:38

多谢大家啊

如何启动DMA

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