用定时器精确延时

只看该作者 · 2014-10-12 12:09

我看过很多例程，精确延时貌似只是把定时器开了，并没有关断定时器，可能表达不清楚，我上代码
#include "stm8s.h"
#include "sysclock.h"

uint32_t  X;
/* Private defines -----------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
void Delay(uint32_t Y)
{
X=Y;
TIM1_Cmd(ENABLE);
while(X!=0);

}

int main(void)
{

  /* 设置外部24M晶振为系统时钟 */
  //SystemClock_Init(HSE_Clock);
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
GPIO_Init(GPIOD, GPIO_PIN_4 ,GPIO_MODE_OUT_PP_LOW_FAST);
   TIM1_TimeBaseInit(16, TIM1_COUNTERMODE_UP, 1000, 0x00);
   TIM1_ITConfig(TIM1_IT_UPDATE, ENABLE);
   TIM1_ARRPreloadConfig(ENABLE);

__enable_interrupt();
  while (1)
  {
/*放置你的代码*/

GPIO_WriteReverse(GPIOD, GPIO_PIN_4);

  Delay(100);
  }

}
下面是中断程序，我是这么写的，我的意思是其实每次程序都进来中断的，只不过我们利用了他计数而已
INTERRUPT_HANDLER(TIM1_UPD_OVF_TRG_BRK_IRQHandler, 11)
{
  /* In order to detect unexpected events during development,
   it is recommended to set a breakpoint on the following instruction.
  */
  if(X!=0)
  {
X--;
TIM1_ClearITPendingBit(TIM1_IT_UPDATE);
  }

}
大多数例程是这样的，这样是不是很浪费？
INTERRUPT_HANDLER(TIM1_UPD_OVF_TRG_BRK_IRQHandler, 11)
{
  /* In order to detect unexpected events during development,
   it is recommended to set a breakpoint on the following instruction.
  */
  if(X!=0)
  {
X--;

  }
   TIM1_ClearITPendingBit(TIM1_IT_UPDATE);
}

由此想到了stm32的滴答计时器，貌似很多例程也是只见看不见关，但是我上面贴的stm8的代码（我自己写的那个）个人感觉不会重复进入，发帖的目的就是想知道，stm32滴答他没关断会不会重复进入中断？我感觉是会的。。。如果会，那些例程是不是不够严谨。--------菜鸟求教