智能车制作

标题: 定时器 [打印本页]

作者: xbhan_06 时间: 2009-3-27 15:58
标题: 定时器
int tim0 = 0,timer_num0 = 0,timer_num = 0;
byte stop_sign = 0,power_sign = 0;
#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt MDC_USE(void)    //定时器中断函数
{
  MCCNT = 40;
  MCFLG = 0x80;
  tim0++;
  if(tim0==20000)
  {
tim0=0;
PORTB_BIT0=~PORTB_BIT0;
  }

  timer_num0++;
  if(timer_num0==2000)
   PORTB = 0X80;
  if(!stop_sign)
  {
if(timer_num==0)       // OPEN THE photoelectric cell
{
      PORTB = 0X40;
}
timer_num++;
if(timer_num==21)
{
      timer_num=0;
      PORTB = 0X20;
}
  }
  else
  {

  }
}
#pragma CODE_SEG DEFAULT
void MDCInit(void)
{
  MCCTL = MCCTL&0Xfb;
  MCCTL = 0Xe1;
  MCCTL = MCCTL|0X04;
  MCCNT = 40;
  MCCTL = MCCTL|0X08  ;
}

void main(void)
{
  DDRB = 0XFF;
  MDCInit();
  EnableInterrupts;
  for(;;)
  {} /* wait forever */
  /* please make sure that you never leave this funct
定时器跑不起来，有没有高手解决一下？

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