multidspwelcome.c

dsp用于测试外部sram

// ********************************************
// Sample DSP application used to showcase GEL 
// components controlling DSP code
// ********************************************

#include <stdio.h>
#include "VC5402.h"
//#include <VC5402.h>
#define TRUE 1
unsigned  	int  *ExRamStart = (unsigned  int *)0x8000;
int counterValue = 0;
int change = 0;
int y=0;
int i=0;
int j=0;
int ms=0;
void main()
{

     asm("  STM #0000h,CLKMD ");  
     while(*CLKMD & 0x01 );
     asm("  STM #40C7h,CLKMD ");  //设置CPU运行频率＝100M
/*  40C7h:5*clkin  =100M
    30c7h:4*clkin  =80M
    20c7h:3*clkin  =60M
    10C7h:2*clkin  =40M
*/
     asm("  stm   #4240h, SWWSR ");
     //2 wait except for on-chip program 1
     asm("  stm   #00A0h, PMST  "); //MP/MC = 0, IPTR = 001,ovly=1,  
     asm("  stm   #0802h, BSCR  "); 
     asm("  STM #0h,IMR ");
     
     asm("  STM #0010h,TCR  "); //关定时器
     asm("  STM #0186ah,PRD  ");//1ms
     asm("  STM #0C2fh,TCR  "); //TCR=最后四位
     asm("  STM #0008h,IFR  ");//开timer0中断

	j=0;
    for(j=0;j<5;j++)
	{
      *(ExRamStart + 2*j) = 0xAAAA;
	}
    j=0;
	for(j=0;j<5;j++)
	{
      *(ExRamStart + 2*j) = 0x5555;
	}

    
//      printf("Welcome to the World of DSP. %d\n",i) ;
			if(*(ExRamStart + 0) == 0x5555)
				{
				printf("DSP address is error. %d\n",*(ExRamStart+i));
				}
     
     
	
}

interrupt void  timer0()
{
     asm("  STM #0008h,IFR  ");//clear timer0 interrupt flag
     ms++;
	 if(ms==1000)
	 {
      ms=0;
      printf("Timer0 is OK.") ;
	 }
     
}