stm32 驱动max30102心率计算的算法实现

以下是基于STM32的MAX30102心率计算的算法实现，采用峰值检测法：

#include "stm32f1xx.h"
#include "MAX30102.h"
#include "heartRate.h"

MAX30102 particleSensor;

#define MAX_BRIGHTNESS 255
#define SAMPLE_RATE 100 //采样率
#define LED_POWER_LEVEL 0x1F //LED功率
#define PULSE_WIDTH 0x02 //脉冲宽度
#define IR_LED_CURRENT 0x1F //红外LED电流
#define RED_LED_CURRENT 0x1F //可见光LED电流

uint32_t irBuffer[SAMPLE_RATE]; //红外光信号缓存
uint32_t redBuffer[SAMPLE_RATE]; //可见光信号缓存

void GPIO_Config(void);
void I2C_Config(void);
void MAX30102_Config(void);
void MAX30102_ReadData(void);
uint8_t getHeartRate(uint32_t* irBuffer, uint32_t* redBuffer, uint32_t bufferSize);

int main(void) {
  SystemInit();

  GPIO_Config();
  I2C_Config();
  MAX30102_Config();

  while (1) {
    MAX30102_ReadData();
    uint8_t heartRate = getHeartRate(irBuffer, redBuffer, SAMPLE_RATE);
    printf("心率：%d\n", heartRate);
    HAL_Delay(1000);
  }
}

//GPIO配置
void GPIO_Config(void) {
  GPIO_InitTypeDef GPIO_InitStruct;

  __HAL_RCC_GPIOB_CLK_ENABLE();

  GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF1_I2C1;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}

//I2C配置
void I2C_Config(void) {
  I2C_HandleTypeDef hi2c;

  __HAL_RCC_I2C1_CLK_ENABLE();

  hi2c.Instance = I2C1;
  hi2c.Init.ClockSpeed = 400000;
  hi2c.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c.Init.OwnAddress1 = 0;
  hi2c.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c.Init.OwnAddress2 = 0;
  hi2c.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  HAL_I2C_Init(&hi2c);
}

//MAX30102配置
void MAX30102_Config(void) {
  particleSensor.setLEDs(LED_POWER_LEVEL, LED_POWER_LEVEL); //设置LED功率
  particleSensor.setPulseAmplitudeIR(IR_LED_CURRENT); //设置红外LED电流
  particleSensor.setPulseAmplitudeRed(RED_LED_CURRENT); //设置可见光LED电流
  particleSensor.setPulseWidth(PULSE_WIDTH); //设置脉冲宽度
  particleSensor.setup(); //设置传感器
}

//读取MAX30102数据
void MAX30102_ReadData(void) {
  uint32_t irIndex = 0;
  uint32_t redIndex = 0;

  while (particleSensor.available()) {
    uint32_t irValue = 0;
    uint32_t redValue = 0;
    particleSensor.check(); //检查传感器状态
    particleSensor.getFIFO(irBuffer + irIndex, redBuffer + redIndex); //获取FIFO数据
    irIndex += 1;
    redIndex += 1;
    irIndex %= SAMPLE_RATE;
    redIndex %= SAMPLE_RATE;
  }
}

//峰值检测法计算心率
uint8_t getHeartRate(uint32_t* irBuffer, uint32_t* redBuffer, uint32_t bufferSize) {
  uint8_t heartRate = 0;
  uint32_t average = 0;
  uint32_t beatCount = 0;
  uint32_t lastBeat = 0;
  uint32_t threshold = 0x2000;
  bool isBeat = false;

  for (uint32_t i = 0; i < bufferSize; i++) {
    uint32_t sample = irBuffer[i];
    average += sample;
    if (sample < threshold && !isBeat && i - lastBeat > 200) {
      isBeat = true;
      beatCount++;
      lastBeat = i;
    }
    if (sample > threshold && isBeat) {
      isBeat = false;
    }
  }

  average /= bufferSize;
  heartRate = beatCount * 60 / ((lastBeat / SAMPLE_RATE) - 1);
  return heartRate;
}

该算法首先配置了STM32的GPIO和I2C，然后对MAX30102传感器进行初始化和设置，最后在主循环中循环读取红外光信号和可见光信号，并调用`getHeartRate()`函数计算心率。`getHeartRate()`函数采用峰值检测法来计算心率，具体实现过程与Arduino版类似。

需要注意的是，该算法中的阈值、采样率、LED功率、电流等参数需要根据实际情况进行调整。同时，需要根据实际情况配置STM32的时钟等参数。