STM8L152C6 TIM4只能进一次中断

只看该作者 · 2013-12-31 16:57

用的库，应该说中断过程就这么简单，但就是不知道为什么只能进一次中断，各位有时间的路过的看下，随便帮个忙找找问题？
#include "stm8l15x.h"
////////////延时函数
void delay(int i)
{ int  j;
  for(j=0;j<i;j++)
{;}
}
void CLK_Init(void)
{
CLK_DeInit();
/* High speed internal clock prescaler: 1 */
  CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);
  /* Enable TIM4 CLK */
  CLK_PeripheralClockConfig(CLK_Peripheral_TIM4, ENABLE);
}
void IO_Init(void)
{
GPIO_DeInit(GPIOE);
GPIO_Init(GPIOE, GPIO_Pin_7, GPIO_Mode_Out_PP_Low_Fast);
GPIO_Write(GPIOE,0xf0);
}
void TIM4_Config(void)
{

TIM4_TimeBaseInit(TIM4_Prescaler_128, 0x7c);
  /* Clear TIM4 update flag */
  TIM4_ClearFlag(TIM4_FLAG_Update);
  /* Enable update interrupt */
  TIM4_ITConfig(TIM4_IT_Update, ENABLE);
  /* Enable TIM4 */
  TIM4_Cmd(ENABLE);
}
void main()
{
IO_Init();
CLK_Init();
TIM4_Config();
  /* enable interrupts */
  enableInterrupts();
while (1)
{
  ;
}
}

这是中断函数：
INTERRUPT_HANDLER(TIM4_UPD_OVF_TRG_IRQHandler,25)
{
/* In order to detect unexpected events during development,
   it is recommended to set a breakpoint on the following instruction.
*/
  u16 count=0 ;
// GPIO_Write(GPIOE,0x00);
  TIM4_ClearITPendingBit(TIM4_IT_Update);
  count++;
  if(count>1000)
  {
GPIO_ToggleBits(GPIOE,GPIO_Pin_7);
count=0;
  }

}