main.c

DSP5402 开发板原理图 很详细 仅共参看

#include "cpu_reg.h"

int ms,f;
Uint16	Temp;

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=0  
     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  ");
     asm("  ORM #0008h,*(IMR) ");/*开时间中断*/
     asm("  ORM #0100h,*(IMR) ");/*开INT3中断*/
     asm("  SSBX  XF ");       

     asm("  RSBX  INTM ");      /*开中断*/ 

     
     f=1;
     ms=0;
     while(1)
     {
       while(ms<500/f);     //LED_flash
       ms=0;
       asm("  RSBX  XF ");       
       while(ms<500/f);
       ms=0;
       asm("  SSBX  XF ");       
     }

}
	  
interrupt void  timer0()
{
     ms++;
}

interrupt	void	int3()
{
	f++;
	if (f>5)	f=1;
}