stm32 标准库 定时灯代码

以下是使用 STM32 标准库实现的定时灯代码：

#include "stm32f10x.h"

#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOC

void init_timer(void);
void init_gpio(void);

int main(void) {
    init_gpio();
    init_timer();

    while(1) {
    }

    return 0;
}

void init_gpio(void) {
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

    GPIO_InitTypeDef GPIO_InitStruct;
    GPIO_InitStruct.GPIO_Pin = LED_PIN;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStruct);
}

void init_timer(void) {
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
    TIM_TimeBaseInitStruct.TIM_Prescaler = 7200 - 1;
    TIM_TimeBaseInitStruct.TIM_Period = 1000 - 1;
    TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);

    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);

    NVIC_InitTypeDef NVIC_InitStruct;
    NVIC_InitStruct.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);

    TIM_Cmd(TIM3, ENABLE);
}

void TIM3_IRQHandler(void) {
    if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) {
        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);

        GPIO_WriteBit(LED_PORT, LED_PIN, !GPIO_ReadOutputDataBit(LED_PORT, LED_PIN));
    }
}

代码中使用 TIM3 定时器来实现定时闪烁 LED，定时器的时钟频率为 72 MHz，预分频值为 7200 - 1，计数器周期为 1000 - 1，即每 1 秒触发一次定时器中断。在定时器中断中翻转 LED 灯的状态。