hello_led.c

nios的dma操作。片上存储器间的数据传输

#include <stdio.h>
#include "system.h"
#include "altera_avalon_pio_regs.h"
//#inclede "altera_avalon_uart_regs.h"
#include "alt_types.h"
#include "altera_avalon_dma.h"
#include "sys/alt_irq.h"
void init_dma(void);  //0x02121000 0x01000000
static void dma_interrupts(void* context,alt_u32 id)
{
  alt_u32 div;
  div=IORD(DMA_BASE,0X0);   
  if((div&0x1)!=0)
  {
    div=0;
  }   
}
void delay(void);
int main (void)
{
  //FILE *uart=NULL;
  unsigned int i;
  unsigned char *tr_data,*wr_data;
  
  tr_data=SDRAM_BASE;               //SDRAM_BASE 0x01000000
  wr_data=ONCHIP_RAM_64_KBYTES_BASE;//ONCHIP_RAM_64_KBYTES_BASE 0x02100000
  for(i=0;i<1024;i++)
   *(wr_data+i)=i; 
  //for(i=0;i<1024;i++)
 //  *(tr_data+i)='e'; 
  delay();   
  init_dma();
  while(1)
  {    
    /*i=IORD(DMA_BASE,0X0);   
    if((i&0x1)!=0)
    {
      i=0;
    } */      
  } 
}
void delay(void)
{
  int i;
  for(i=0;i<1000;i++);
}
void init_dma(void)
{
  alt_u32 context=0;
  IOWR(DMA_BASE,0X0,0X00); //STATUS      
  IOWR(DMA_BASE,0X6,0x0);//control  
  IOWR(DMA_BASE,0X1,ONCHIP_RAM_64_KBYTES_BASE);//读主控端开始地址
  IOWR(DMA_BASE,0X2,(ONCHIP_RAM_64_KBYTES_BASE+1024));//写主控端开始地址
  IOWR(DMA_BASE,0X3,1024);
                      //0010011001
  IOWR(DMA_BASE,0X6,0x099);//control
 
  alt_irq_register(DMA_IRQ,context,dma_interrupts);    
}