STM32103fx单片机使用定时器TIM3实现灯一秒亮一次程序问题 -

//主函数

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void TIM3_Config(void)
{
/*1表示亮灯 0表示不亮*/
/* TIM_TimeBaseInitTypeDef结构体在stm32f10x_tim.h中定义 */
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
TIM_DeInit(TIM3);
/* 计数10000次 */
TIM_TimeBaseStructure.TIM_Period = (10000-1);
/* 预分频系数，7200，因为系统时钟72MHZ */
TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
//TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
/* 根据设定的参数设置TIM1 */
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);//使能或者失能指定的TIM中断TIM3,
TIM_Cmd(TIM3, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, DISABLE);
}
void GPIO_Config(void)
{
/* 定义GPIO_InitTypeDef结构体，在stm32f10x_gpio.h中定义 */
GPIO_InitTypeDef GPIO_InitStructure;
/* 使能 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; /*驱动LED*/
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void NVIC_Config(void){
NVIC_InitTypeDef NVIC_InitStructure;
// 设置中断组为0
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
// 设置中断来源
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn ;
// 设置主优先级为 0
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
// 设置抢占优先级为3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

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//服务子函数

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int main(void)
{
void GPIO_Config();
void TIM3_Config();
void NVIC_Config();
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
while(1){
if(time==1000){
time=0;
led=~led;
if(led ==1)
GPIO_SetBits(GPIOA, GPIO_Pin_5);
else
GPIO_ResetBits(GPIOA, GPIO_Pin_5);
}
}
}

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void TIM3_IRQHandler(void) //TIM3中断
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) == SET) //检查指定的TIM中断发生与否:TIM 中断源
{TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
time++;
TIM_ClearITPendingBit(TIM3, TIM_IT_Update); //清除TIMx的中断待处理位:TIM 中断源
}
}

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