使用标准库用定时器6定时点亮led的代码

以下是使用定时器6定时点亮LED的代码：

#include "stm32f10x.h"

void TIM6_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM6, TIM_IT_Update) != RESET)
    {
        GPIO_WriteBit(GPIOA, GPIO_Pin_5, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOA, GPIO_Pin_5)));
        TIM_ClearITPendingBit(TIM6, TIM_IT_Update);
    }
}

int main(void)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);

    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
    TIM_TimeBaseInitStruct.TIM_Period = 999; // 定时器周期为 1000
    TIM_TimeBaseInitStruct.TIM_Prescaler = 7199; // 预分频器为 7200
    TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM6, &TIM_TimeBaseInitStruct);

    NVIC_InitTypeDef NVIC_InitStruct;
    NVIC_InitStruct.NVIC_IRQChannel = TIM6_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);

    TIM_ITConfig(TIM6, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM6, ENABLE);

    GPIO_InitTypeDef GPIO_InitStruct;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    while (1);
}

这段代码使用了定时器6来定时点亮PA5引脚上的LED。定时器的时钟频率为72MHz，预分频器为7200，计数器周期为1000，所以定时时间为1s。每次定时器溢出时，会触发TIM6_IRQHandler中断，并翻转PA5引脚的电平。同时需要注意，在main函数中添加了一个死循环，以保证程序不会退出。