stm32开发板计数代码

以下是一个简单的STM32计数器代码，使用TIM2定时器和PA0引脚作为输入捕获通道：

#include "stm32f10x.h"

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)
    {
        static uint32_t last_count = 0;
        uint32_t current_count = TIM_GetCapture1(TIM2);
        uint32_t count_diff = current_count - last_count;
        last_count = current_count;
        // 处理计数值
        // ...
        TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
    }
}

int main(void)
{
    // 初始化GPIO和TIM2
    // ...
    // 配置TIM2为输入捕获模式
    TIM_ICInitTypeDef TIM_ICInitStructure;
    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICFilter = 0x0;    TIM_ICInit(TIM2, &TIM_ICInitStructure);
    // 使能TIM2中断
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);
    // 启动TIM2
    TIM_Cmd(TIM2, ENABLE);
    while (1)
    {
        // 主循环
        // ...
    }
}