keil平台基于stm32的AD8232心电采集求心率程序简单的

以下是基于Keil平台和STM32的AD8232心电采集求心率的简单程序示例：

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

#define SAMPLE_RATE 500 //采样频率
#define BUFFER_SIZE 100 //数据缓存区大小

int16_t buffer[BUFFER_SIZE]; //数据缓存区
uint16_t buffer_index = 0; //当前采样位置
uint32_t last_beat_time = 0; //上次心跳时间
uint16_t heart_rate = 0; //心率

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

        int16_t adc_value = ADC1->DR; //读取ADC采样值
        buffer[buffer_index] = adc_value; //将采样值存入缓存区

        if (++buffer_index >= BUFFER_SIZE) //缓存区已满
        {
            buffer_index = 0;

            uint32_t current_time = TIM2->CNT; //获取当前时间
            uint32_t interval = current_time - last_beat_time; //计算距上次心跳时间间隔

            if (interval > SAMPLE_RATE) //达到一定时间间隔
            {
                last_beat_time = current_time; //更新上次心跳时间

                //计算心率
                uint16_t beats = 0;
                for (int i = 0; i < BUFFER_SIZE; i++)
                {
                    if (buffer[i] > 0 && buffer[i + 1] <= 0)
                    {
                        beats++;
                    }
                }
                heart_rate = (beats * 60) / (interval / SAMPLE_RATE);

                //打印心率
                printf("Heart rate: %d bpm\n", heart_rate);
            }
        }
    }
}

void ADC1_Init(void)
{
    ADC_InitTypeDef adc_init;
    GPIO_InitTypeDef gpio_init;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1, ENABLE);

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

    ADC_StructInit(&adc_init);
    adc_init.ADC_ContinuousConvMode = ENABLE;
    adc_init.ADC_DataAlign = ADC_DataAlign_Right;
    adc_init.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
    adc_init.ADC_Mode = ADC_Mode_Independent;
    adc_init.ADC_NbrOfChannel = 1;
    adc_init.ADC_ScanConvMode = DISABLE;
    ADC_Init(ADC1, &adc_init);

    ADC_Cmd(ADC1, ENABLE);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    ADC_ExternalTrigConvCmd(ADC1, ENABLE);

    TIM_Cmd(TIM2, ENABLE);
}

int main(void)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    TIM_TimeBaseInitTypeDef tim_init;
    TIM_TimeBaseStructInit(&tim_init);
    tim_init.TIM_Prescaler = SystemCoreClock / SAMPLE_RATE - 1;
    tim_init.TIM_Period = 1;
    TIM_TimeBaseInit(TIM2, &tim_init);

    NVIC_EnableIRQ(TIM2_IRQn);

    ADC1_Init();

    printf("Heart rate monitor started\n");

    while (1)
    {
    }
}

注意：这只是一个简单的示例程序，实际应用中还需要进行更多的优化和改进，比如滤波、增加心跳检测的准确性等。