基于stm32c8t6的心率检测代码

以下是基于STM32C8T6的心率检测的示例代码，仅供参考：

#include "stm32c8t6.h"
#include "stdio.h"

#define LED_PIN  GPIO_PIN_12

int heart_rate = 0;
int heart_beat_detected = 0;
int last_beat_time = 0;
int current_beat_time = 0;

void init_gpio()
{
    RCC->AHBENR |= RCC_AHBENR_GPIOBEN;  // Enable GPIOB clock

    GPIOB->MODER &= ~(3 << (LED_PIN * 2));  // Clear pin mode
    GPIOB->MODER |= (1 << (LED_PIN * 2));   // Set pin as output
    GPIOB->ODR &= ~(1 << LED_PIN);          // Turn off LED
}

void init_timer()
{
    RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;  // Enable TIM2 clock
    TIM2->PSC = SystemCoreClock / 1000 - 1;  // Set prescaler to 1000
    TIM2->ARR = 60000 - 1;  // Set auto-reload value to 60000
    TIM2->DIER = TIM_DIER_UIE;  // Enable update interrupt
    NVIC_EnableIRQ(TIM2_IRQn);  // Enable TIM2 interrupt
    TIM2->CR1 = TIM_CR1_CEN;  // Enable timer
}

void init_adc()
{
    RCC->APB2ENR |= RCC_APB2ENR_ADCEN;  // Enable ADC clock
    ADC1->CR |= ADC_CR_ADEN;  // Enable ADC
    while (!(ADC1->ISR & ADC_ISR_ADRDY));  // Wait for ADC to be ready
    ADC1->CFGR1 |= ADC_CFGR1_RES_1;  // Set ADC resolution to 10 bits
    ADC1->CHSELR |= ADC_CHSELR_CHSEL5;  // Select ADC channel 5
    ADC1->CR |= ADC_CR_ADSTART;  // Start ADC conversion
}

void TIM2_IRQHandler()
{
    if (TIM2->SR & TIM_SR_UIF)
    {
        GPIOB->ODR ^= (1 << LED_PIN);  // Toggle LED
        TIM2->SR &= ~TIM_SR_UIF;  // Clear interrupt flag
        current_beat_time++;
        if (current_beat_time - last_beat_time > 150 && heart_beat_detected)
        {
            heart_rate = 60000 / (current_beat_time - last_beat_time);
            last_beat_time = current_beat_time;
            heart_beat_detected = 0;
        }
    }
}

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

    while (1)
    {
        if (ADC1->ISR & ADC_ISR_EOC)
        {
            int adc_value = ADC1->DR & 0x3FF;  // Get ADC conversion result
            if (adc_value > 500 && !heart_beat_detected)
            {
                heart_beat_detected = 1;
            }
            ADC1->ISR |= ADC_ISR_EOC;  // Clear EOC flag
        }
    }
    return 0;
}

这段代码使用了定时器、GPIO和ADC模块，实现了心率检测的功能。其中，定时器用于计时和LED闪烁，ADC模块用于采集心率传感器信号，GPIO用于控制LED灯。在定时器中，通过计算相邻心跳周期的时间间隔，计算心率值，并保存到heart_rate变量中。在ADC中，通过检测心率传感器信号的上升沿来判断心跳是否发生，并将心跳检测结果保存到heart_beat_detected变量中。由于心率检测需要在一定时间内完成，因此在定时器中使用了中断机制，提高了代码的执行效率。