main.c

来自「ti公司dsp5402上实现定时功能,已通过测试.」· C语言 代码 · 共 53 行

#include "cpu_reg.h"

int ms,f;


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("  RSBX  INTM ");      /*开中断*/ 

     
     f=2;
     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++;
}