stm32中使用pulsesensor传感器检测心率使用c语言，程序该怎么写

使用PulseSensor检测心率需要使用STM32的定时器和外部中断。以下是一份示例代码，可以供参考：

#include "stm32f10x.h"

#define PULSE_SENSOR_PIN GPIO_Pin_0
#define PULSE_SENSOR_PORT GPIOA
#define PULSE_SENSOR_EXTI_LINE EXTI_Line0
#define PULSE_TIMER TIM2

volatile uint16_t pulse_count = 0; // 脉冲计数器
volatile uint16_t last_bpm = 0; // 上一次计算得到的心率值

void init_gpio(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // 使能GPIOA时钟

    GPIO_InitStructure.GPIO_Pin = PULSE_SENSOR_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(PULSE_SENSOR_PORT, &GPIO_InitStructure);
}

void init_timer(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); // 使能TIM2时钟

    TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
    TIM_TimeBaseStructure.TIM_Prescaler = 71; // 分频器，使定时器频率为1MHz
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(PULSE_TIMER, &TIM_TimeBaseStructure);

    TIM_ClearFlag(PULSE_TIMER, TIM_FLAG_Update); // 清除更新标志位
    TIM_ITConfig(PULSE_TIMER, TIM_IT_Update, ENABLE); // 使能更新中断
}

void init_exti(void)
{
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0); // 关联GPIOA.0和外部中断线0

    EXTI_InitStructure.EXTI_Line = PULSE_SENSOR_EXTI_LINE;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling; // 上升沿和下降沿都触发中断
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void EXTI0_IRQHandler(void)
{
    if (EXTI_GetITStatus(PULSE_SENSOR_EXTI_LINE) != RESET) {
        pulse_count++; // 脉冲计数器加1
        EXTI_ClearITPendingBit(PULSE_SENSOR_EXTI_LINE); // 清除中断标志位
    }
}

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(PULSE_TIMER, TIM_IT_Update) != RESET) {
        uint16_t bpm;

        TIM_ClearITPendingBit(PULSE_TIMER, TIM_FLAG_Update); // 清除更新标志位

        bpm = pulse_count * 60 / 2; // 计算心率值
        last_bpm = bpm;
        pulse_count = 0; // 清零脉冲计数器
    }
}

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

    TIM_Cmd(PULSE_TIMER, ENABLE); // 启动定时器

    while (1) {
        // 这里可以进行其他的操作
    }
}

在这个例子中，我们使用PA0作为PulseSensor的输入引脚，并将其连接到外部中断线0。使用TIM2作为定时器，计算脉冲的数量，并在定时器中断处理程序中计算心率值。注意，定时器的频率应该足够高，以便精确计算心率值。