dmainit.c

TI（德州仪器公司）的CC2430芯片的库函数以及一些应用

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Filename:     dmaInit.c
Target:       cc2430
Author:       EFU
Revised:      16/12-2005
Revision:     1.0
******************************************************************************/

#include <string.h>
#include "cul.h"

// Reserving space for a global DMA channel descriptor list
DMA_DESC dmaChannel1to4[4];

// Table for assigning DMA channels.
DMA_TABLE_ENTRY dmaTable[DMA_ADM_NUMBER_OF_CHANNELS];


//-----------------------------------------------------------------------------
// See cul.h for a description of this function.
//-----------------------------------------------------------------------------
void culDmaInit(void){

   // Clearing all channels
   memset((void*)dmaChannel1to4, 0, sizeof(dmaChannel1to4));

   // Clearing the DMA table
   memset((void*)dmaTable, 0, sizeof(dmaTable));

   // Clearing any arming of channels 1 to 4, but leaving staus of channel 0.
   DMAARM &= DMA_CHANNEL_0;

   // Clearing all starting of DMA channels 1 to 4, but leaving status of channel 0.
   DMAREQ &= DMA_CHANNEL_0;

   // Clearing all DMA interrupt flags of channels 1 to 4, but leaving status of channel 0.
   DMAIRQ &= DMA_CHANNEL_0;

   // Clearing the interrupt flag of the DMA and enabling DMA interrupt.
   INT_SETFLAG(INUM_DMA, INT_CLR);
   INT_ENABLE(INUM_DMA, INT_ON);

   // Setting the address of the DMA descriptors
   DMA_SET_ADDR_DESC1234(dmaChannel1to4);

} // ends culDmaInit()


//-----------------------------------------------------------------------------
// See cul.h for a description of this function.
//-----------------------------------------------------------------------------
void culSetDmaChannel0CallBack(FUNCTION* pCallBackFunction)
{
   dmaTable[0].assigned = TRUE;
   dmaTable[0].callBackFunction = pCallBackFunction;

   return;
}


//-----------------------------------------------------------------------------
// See cul.h for a description of this function.
//-----------------------------------------------------------------------------
void culClearDmaChannel0CallBack(void)
{
   dmaTable[0].assigned = FALSE;
   dmaTable[0].callBackFunction = NULL;

   return;
}



//-----------------------------------------------------------------------------
// dma_IRQ
//
//  Description:
//      This interrupt routine is run each time the DMA generates an interrupt.
//      According to the interrupt flag of the DMA channel, the corresponding
//      callBackFunction is called. The interrupt flags are cleared.
//-----------------------------------------------------------------------------
#pragma vector=DMA_VECTOR
__interrupt void dma_IRQ (void){

   INT_GLOBAL_ENABLE(INT_OFF);
   // Clearing the interrupt flag.
   DMAIF = 0;

   if(DMAIRQ & DMA_CHANNEL_0){
      // Clearing interrupt flag
      DMAIRQ &= ~DMA_CHANNEL_0;

      // Calling the callback function.
      if(dmaTable[0].callBackFunction){
         dmaTable[0].callBackFunction();
      }
   }
   if(DMAIRQ & DMA_CHANNEL_1){
      // Clearing interrupt flag
      DMAIRQ &= ~DMA_CHANNEL_1;

      // Calling the callback function.
      if(dmaTable[1].callBackFunction){
         dmaTable[1].callBackFunction();
      }
   }
   if(DMAIRQ & DMA_CHANNEL_2){
      // Clearing interrupt flag
      DMAIRQ &= ~DMA_CHANNEL_2;

      // Calling the callback function.
      if(dmaTable[2].callBackFunction){
         dmaTable[2].callBackFunction();
      }
   }
   if(DMAIRQ & DMA_CHANNEL_3){
      // Clearing interrupt flag
      DMAIRQ &= ~DMA_CHANNEL_3;

      // Calling the callback function.
      if(dmaTable[3].callBackFunction){
         dmaTable[3].callBackFunction();
      }
   }
   if(DMAIRQ & DMA_CHANNEL_4){
      // Clearing interrupt flag
      DMAIRQ &= ~DMA_CHANNEL_4;

      // Calling the callback function.
      if(dmaTable[4].callBackFunction){
         dmaTable[4].callBackFunction();
      }
   }

   INT_GLOBAL_ENABLE(INT_ON);
}