主函数标志位的值如何传入中断函数里？

折腾无止境 · 发表于 2018-1-7 16:18:41

void  main(void)
{
  if(key_down(key_port,key_pin)==0)
  {
// led1_open();
flag++;
if(flag == 3)
{
   flag = 0;
}
while(key_down(key_port,key_pin)==0);
  }
  else
  {
// led_close();
// led1_close();
  }

INTERRUPT_HANDLER(TIM4_UPD_OVF_IRQHandler, 23)
{
  /* In order to detect unexpected events during development,
   it is recommended to set a breakpoint on the following instruction.
  */
TIM4_ClearITPendingBit(TIM4_IT_UPDATE);
//led_reset();
switch(flag)
{
   case 0:
         led_close();
         break;
   case 1:
         led_open();
         break;
   case 2:
         led_reset();
         break;
   default:
         break;
}
}