51 单片机 max30102 驱动代码

以下是基于STM32的MAX30102传感器驱动代码供参考：

#include "max30102.h"
#include "i2c.h"
#include "main.h"

#define MAX30102_ADDR 0xAE
#define I2C_TIMEOUT 1000

uint8_t MAX30102_Init(void)
{
	uint8_t ret = 0;
	uint8_t temp;
	
	temp = 0x40; //reset
	ret = MAX30102_WriteReg(REG_MODE_CONFIG, &temp, 1);
	
	HAL_Delay(100); //wait for reset complete
	
	temp = 0x03; //mode config, SpO2 mode, 400sps
	ret = MAX30102_WriteReg(REG_MODE_CONFIG, &temp, 1);
	
	temp = 0x27; //sp02 config, 16-bit resolution, 4000hz
	ret = MAX30102_WriteReg(REG_SPO2_CONFIG, &temp, 1);
	
	temp = 0x07; //led pulse amplitude, 0-255
	ret = MAX30102_WriteReg(REG_LED1_PA, &temp, 1);
	ret = MAX30102_WriteReg(REG_LED2_PA, &temp, 1);
	
	temp = 0x1F; //fifo config, sample avg = 1, fifo rollover on overflow
	ret = MAX30102_WriteReg(REG_FIFO_CONFIG, &temp, 1);
	
	temp = 0x02; //enable both red and ir led
	ret = MAX30102_WriteReg(REG_LED_CONFIG, &temp, 1);
	
	temp = 0x05; //sp02 adc range = 4096
	ret = MAX30102_WriteReg(REG_SPO2_ADC_RANGE, &temp, 1);
	
	temp = 0x00; //interrupt enable, no sample ready
	ret = MAX30102_WriteReg(REG_INT_ENABLE, &temp, 1);
	
	return ret;
}

uint8_t MAX30102_WriteReg(uint8_t reg, uint8_t *buf, uint8_t len)
{
	uint8_t ret;
	
	//send register address
	ret = HAL_I2C_Master_Transmit(&hi2c1, MAX30102_ADDR, &reg, 1, I2C_TIMEOUT);
	if(ret != HAL_OK) return ret;
	
	//send data
	ret = HAL_I2C_Master_Transmit(&hi2c1, MAX30102_ADDR, buf, len, I2C_TIMEOUT);
	if(ret != HAL_OK) return ret;
	
	return HAL_OK;
}

uint8_t MAX30102_ReadReg(uint8_t reg, uint8_t *buf, uint8_t len)
{
	uint8_t ret;
	
	//send register address
	ret = HAL_I2C_Master_Transmit(&hi2c1, MAX30102_ADDR, &reg, 1, I2C_TIMEOUT);
	if(ret != HAL_OK) return ret;
	
	//read data
	ret = HAL_I2C_Master_Receive(&hi2c1, MAX30102_ADDR, buf, len, I2C_TIMEOUT);
	if(ret != HAL_OK) return ret;
	
	return HAL_OK;
}

uint8_t MAX30102_ReadFIFO(uint32_t *red, uint32_t *ir)
{
	uint8_t ret;
	uint8_t buf[6];
	
	//read fifo data
	ret = MAX30102_ReadReg(REG_FIFO_DATA, buf, 6);
	if(ret != HAL_OK) return ret;
	
	//parse fifo data
	*red = ((uint32_t)buf[0] << 16) | ((uint32_t)buf[1] << 8) | buf[2];
	*ir = ((uint32_t)buf[3] << 16) | ((uint32_t)buf[4] << 8) | buf[5];
	
	return HAL_OK;
}

其中，`MAX30102_Init` 函数初始化了 MAX30102 传感器的各种配置寄存器，`MAX30102_WriteReg` 和 `MAX30102_ReadReg` 分别用于写入和读取寄存器值，`MAX30102_ReadFIFO` 用于读取 FIFO 数据。需要注意的是，这里使用的是 STM32 的 HAL 库函数，如果使用其他平台需要做相应修改。