使用STM32f103的hal库编写MAX30100传感器代码

以下是使用STM32f103的HAL库编写MAX30100传感器代码的示例：

#include "stm32f1xx_hal.h"
#include "MAX30100.h"

// Define the I2C address of the MAX30100 sensor
#define MAX30100_ADDRESS 0xAE

// Define the I2C handle and buffer
I2C_HandleTypeDef hi2c1;
uint8_t i2c_read_buffer[4];

// Define the PulseOximeter object
PulseOximeter pox;

// Define the reporting period in milliseconds
#define REPORTING_PERIOD_MS 1000

// Define the timestamp of the last report
uint32_t tsLastReport = 0;

// Function to initialize the I2C interface
void I2C_Init(void)
{
  hi2c1.Instance = I2C1;
  hi2c1.Init.ClockSpeed = 100000;
  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    Error_Handler();
  }
}

// Function to read data from the MAX30100 sensor
void MAX30100_Read(uint8_t reg, uint8_t *data, uint16_t size)
{
  HAL_I2C_Master_Transmit(&hi2c1, MAX30100_ADDRESS, &reg, 1, 1000);
  HAL_I2C_Master_Receive(&hi2c1, MAX30100_ADDRESS, data, size, 1000);
}

// Function to write data to the MAX30100 sensor
void MAX30100_Write(uint8_t reg, uint8_t *data, uint16_t size)
{
  uint8_t buffer[size + 1];
  buffer[0] = reg;
  memcpy(buffer + 1, data, size);
  HAL_I2C_Master_Transmit(&hi2c1, MAX30100_ADDRESS, buffer, size + 1, 1000);
}

// Callback function to process heart beat detection
void onBeatDetected()
{
  printf("Beat!\r\n");
}

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  I2C_Init();

  // Initialize the MAX30100 sensor
  MAX30100_Init(MAX30100_Read, MAX30100_Write);
  if (!pox.begin()) {
    printf("Failed to initialize pulse oximeter!\r\n");
    while (1);
  }

  // Set the beat detection callback function
  pox.setOnBeatDetectedCallback(onBeatDetected);

  // Main loop
  while (1)
  {
    // Update the pulse oximeter data
    pox.update();

    // Report the heart rate and SpO2 values every REPORTING_PERIOD_MS milliseconds
    if (HAL_GetTick() - tsLastReport > REPORTING_PERIOD_MS) {
      printf("Heart rate: %d bpm / SpO2: %d %%\r\n", pox.getHeartRate(), pox.getSpO2());
      tsLastReport = HAL_GetTick();
    }
  }
}

此代码使用STM32 HAL库来初始化I2C接口并读取MAX30100传感器数据。在onBeatDetected()中，处理心跳检测回调函数。在main()中，初始化MAX30100传感器并设置心跳检测回调函数。在主循环中，通过调用pox.update()来更新传感器数据，并在REPORTING_PERIOD_MS时间间隔内报告心率和SpO2值。