dma.c

基于cc2430的无限通信实例

/******************************************************************************
Filename:     dma.c
Target:       cc2430
Revised:      16/12-2005
Revision:     1.0

Description:
    This example shows how to set up a DMA transfer between two RAM locations.
    See also other examples for DMA setup (e.g. AES, ADC_SERIES, FLASH).

******************************************************************************/
#include <string.h>
#include "RF04EB.h"
#include "app_ex.h"
#include "menu.h"
#include "lcd128_64.h"
#include "hal.h"

// Prototypes
void initDma(void);
void dma_main(void);


/******************************************************************************
* @fn  initDma
*
* @brief
*      Initializes components for the DMA transfer application example.
*
* Parameters:
*
* @param  void
*
* @return void
*
******************************************************************************/
void initDma(void)
{
   SET_MAIN_CLOCK_SOURCE(CRYSTAL);
   INIT_GLED();
   INIT_YLED();
}


/******************************************************************************
* @fn  dma_main
*
* @brief
*      Sets up the DMA to transfer data between to RAM locations, trigged by
*      external interrupt generated by button S1. Checks validity of data
*      after transfer.
*
* Parameters:
*
* @param  void
*
* @return void
*
******************************************************************************/
#ifdef COMPLETE_APPLICATION
void dma_main(void){
#else
void main(void){
#endif
   DMA_DESC dmaChannel;
   char sourceString[56] = "This is a test string used to demonstrate DMA transfer."; //56 bytes
   char destString[56];
   INT8 i;
   INT8 errors = 0;


   initDma();

   ClearScreen();
   Print(0,5,"---DMA TEST---",1);
   Rectangle(2 , 2 , 108 , 5);

   //Clearing the destination
   memset(destString,0,sizeof(destString));

     // Setting up the DMA channel.
   SET_WORD(dmaChannel.SRCADDRH, dmaChannel.SRCADDRL,   &sourceString); // The start address of the data to be transmitted
   SET_WORD(dmaChannel.DESTADDRH, dmaChannel.DESTADDRL, &destString);   // The start address of the destination.
   SET_WORD(dmaChannel.LENH, dmaChannel.LENL, sizeof(sourceString));    // Setting the number of bytes to transfer.
   dmaChannel.VLEN      = VLEN_USE_LEN;  // Using the length field to determine how many bytes to transfer.
   dmaChannel.PRIORITY  = PRI_HIGH;      // High priority.
   dmaChannel.M8        = M8_USE_8_BITS; // Irrelevant since length is determined by the LENH and LENL.
   dmaChannel.IRQMASK   = FALSE;         // The DMA shall not issue an IRQ upon completion.
   dmaChannel.DESTINC   = DESTINC_1;     // The destination address is to be incremented by 1 after each transfer.
   dmaChannel.SRCINC    = SRCINC_1;      // The source address inremented by 1 byte after each transfer.
   dmaChannel.TRIG      = DMATRIG_NONE;  // The DMA channel will be started manually.
   dmaChannel.TMODE     = TMODE_BLOCK;   // The number of bytes specified by LENH and LENL is transferred.
   dmaChannel.WORDSIZE  = WORDSIZE_BYTE; // One byte is transferred each time.


   // Using DMA channel 0.
   // Setting where the DMA channel is to read the desciptor and arming the DMA channel.
   DMA_SET_ADDR_DESC0(&dmaChannel);
   DMA_ABORT_CHANNEL(0);
   DMA_ARM_CHANNEL(0);

   //Waiting for the user to start the transfer.
   if(LanguageSel == 1)
   {
       Print6(3,35, "Press OK",1);
       Print6(4,20, "to start DMA.",1);
   }
   else
   {
     Print(3,4,"按OK键开始:",1);
   }
 //  lcdUpdate((char*)"Press S1",(char*)"to start DMA.");
   while(K_OK != ScanKey());
   while(ScanKey() != 0Xff);
   halWait(5);

   // Clearing all DMA complete flags and starting the transfer.
   DMAIRQ = 0x00;
   DMA_START_CHANNEL(0);

   // Waiting for the DMA to finish.
//   while(K_OK != ScanKey());
   if(LanguageSel == 1)
   {
       Print(3,8, "  Waiting...  ",1);
   }
   else
   {
       Print(3,4,"请稍等...",1);
   }
   while(!(DMAIRQ & DMA_CHANNEL_0));
   if(LanguageSel == 1)
   {
       Print6(3,20, "  Press UP  ",1);
       Print6(4,20, "to continue...",1);
   }
   else
   {
       Print(3,4,"按UP键继续...",1);
   }
   while(K_UP != ScanKey());
   while(ScanKey() != 0Xff);
   halWait(5);
   // Verifying that data is transferred correctly
   for(i=0;i<sizeof(sourceString);i++)
   {
     if(sourceString[i] != destString[i])
         errors++;
   }


   //Displaying the result
   if(errors == 0)
   {
       if(LanguageSel == 1)
       {
           Print6(3,20, "Dma transfer",1);
           Print6(4,20, "correct!       ",1);
       }
       else
       {
           Print(3,4,"   DMA正确!  ",1);
       }
   }
   else
   {
       if(LanguageSel == 1)
       {
           Print6(3,20, "Error in DMA",1);
           Print6(4,20, "   Transfer    ",1);
       }
       else
       {
           Print(3,4,"   DMA错误!  ",1);
       }
   }
   Print6(7,13,"<CANCEL TO ESC>",1);
   while (K_CANCEL != ScanKey());
   while(ScanKey() != 0Xff);
   halWait(5);
   return;
}