stm32f103利用AD8232采集的心电信号求心率具体程序

下面是一个基于STM32F103和AD8232的心电信号采集和心率计算的示例程序。请注意，这是一个简单的示例，可能需要根据具体硬件和应用进行调整。

#include "stm32f10x.h"
#include "stdio.h"

#define ADC1_DR_Address ((uint32_t)0x4001244C) // ADC1数据寄存器地址
#define SAMPLE_SIZE 500 // 采样点数
#define THRESHOLD 500 // 心电信号阈值，可根据实际情况调整

uint16_t ADCValue[SAMPLE_SIZE]; // ADC采样值数组
uint16_t heartRate = 0; // 心率变量

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void ADC_Configuration(void)
{
    ADC_InitTypeDef ADC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);

    ADC_Cmd(ADC1, ENABLE);

    ADC_ResetCalibration(ADC1);

    while (ADC_GetResetCalibrationStatus(ADC1))
        ;

    ADC_StartCalibration(ADC1);

    while (ADC_GetCalibrationStatus(ADC1))
        ;

    ADC_TempSensorVrefintCmd(ENABLE);
}

void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = 999; // 1ms中断一次
    TIM_TimeBaseStructure.TIM_Prescaler = 7199; // 72MHz计时器时钟分频7200
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    TIM_Cmd(TIM2, ENABLE);
}

void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void TIM2_IRQHandler(void)
{
    static uint16_t index = 0;
    static uint16_t lastValue = 0;
    uint16_t adcValue;

    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

        adcValue = ADC_GetConversionValue(ADC1); // 读取ADC采样值

        if (adcValue > THRESHOLD && lastValue <= THRESHOLD) // 心电信号上升沿
        {
            heartRate = 60000 / (index * 2); // 计算心率
            index = 0;
        }

        lastValue = adcValue;
        ADCValue[index++] = adcValue; // 存储采样值

        if (index >= SAMPLE_SIZE) // 采样完成
        {
            TIM_Cmd(TIM2, DISABLE); // 停止计时器
        }
    }
}

int main(void)
{
    GPIO_Configuration();
    ADC_Configuration();
    TIM_Configuration();
    NVIC_Configuration();

    while (1)
    {
        if (heartRate != 0)
        {
            printf("Heart rate: %d bpm\n", heartRate);
            heartRate = 0;
            TIM_Cmd(TIM2, ENABLE); // 重新启动计时器
        }
    }
}

该程序的核心部分是在TIM2中断中读取ADC采样值并计算心率。当心电信号上升沿被检测到时，根据采样点数和时间间隔计算出心率值。在计算心率过程中，也可以将采样值存储到数组中，用于后续的信号处理和分析。