stspearnet.c

来自「最新版IAR FOR ARM（EWARM）5.11中的代码例子」· C语言 代码 · 共 64 行

//-----------------------------------------------------------------------------
// SPEArNet DMA transfer example
//-----------------------------------------------------------------------------
#include "hal_map.h"
#include "hal_type.h"
#include "hal_dma.h"
#include "hal_ic.h"
#include "hal_gpio.h"


//-----------------------------------------------------------------------------
volatile void delay(int time)
{
  unsigned short i, j;
  for(j=0; j<time; j++){
  for(i=0; i<0xFFFF; i++);
  }
}

//-----------------------------------------------------------------------------
//name: MAIN_Dma()
//funcionality: Demonstrates the DMA data transfers. In this example a simple
//memory to memory transfer is demonstrated.
//-----------------------------------------------------------------------------
void MAIN_Dma(void){

  u32 addressSrc = 0x10000000;
  u32 addressDst = 0x10000020;

  //Clear Src and Dest addreses
  *(u32 *)addressSrc = 0x0;*(u32 *)(addressSrc+4) = 0x0;
  *(u32 *)addressDst = 0x0;*(u32 *)(addressDst+4) = 0x0;

  //Values for test purposes in external SDRAM
  *(u32 *)addressSrc = 0x12345678;
  *(u32 *)(addressSrc+4) = 0x89ABCDEF;

  //DMA controller settings
  DMA_SetSrcAddress(DMA_CH3,addressSrc);
  DMA_SetDstAddress(DMA_CH3,addressDst);
  DMA_Init(DMA_CH3, 2); //you can limit number of units to be copied only during the burst mode
  DMA_EnableInterrupt(DMA_CH3);

  GPIO_Init(GPIO_ALL_AS_OUTs);

  //Global interrupts
  IC_Clear ();
  IC_Global_OnOff (IC_IRQ,ENABLE);
  IC_Global_OnOff (IC_FIQ,DISABLE);
  IC_Int_Config (IC_DMA,IC_HIGH_LEVEL);
  IC_Int_OnOff (IC_DMA,ENABLE);

  DMA_Start(DMA_CH3); //Start the Mem to Mem transfer
}
//-----------------------------------------------------------------------------

int main()
{
MAIN_Dma();//

}
//-----------------------------------------------------------------------------