stm32的心率算法公式双阀值的程序
时间: 2024-05-10 13:16:41 浏览: 10
以下是一个基于STM32的心率算法双阀值的程序,使用的是基于光电传感器的心率检测方法:
```
#include "stm32f10x.h"
#define THRESHOLD_LOW 50
#define THRESHOLD_HIGH 120
uint16_t adc_value = 0;
uint16_t heart_rate = 0;
uint16_t last_heart_rate = 0;
int main(void) {
// 初始化GPIO和ADC
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_InitTypeDef ADC_InitStructure;
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);
// 初始化定时器和中断
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 999;
TIM_TimeBaseStructure.TIM_Prescaler = 7199;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
while(1) {
if (adc_value > THRESHOLD_HIGH && last_heart_rate == 0) {
last_heart_rate = heart_rate;
heart_rate = 60000 / TIM2->CNT;
TIM2->CNT = 0;
} else if (adc_value < THRESHOLD_LOW && last_heart_rate != 0) {
last_heart_rate = 0;
}
}
}
void TIM2_IRQHandler(void) {
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) {
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
adc_value = ADC_GetConversionValue(ADC1);
}
}
```
此程序使用定时器和ADC读取传感器的值,在每次定时器中断时检查传感器的值是否超过设定的两个阀值。如果传感器的值超过了高阀值,并且上一个心率值为0,则计算当前心率,并将计时器复位。如果传感器的值低于低阀值,并且上一个心率值不为0,则将上一个心率值清零。
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