需求

需要用 stm32 来驱动 bh1750 的光照模块

解决

使用硬件 I2C 来驱动，很简单

#include "i2c.h"

#define BH1750_ADDRESS 0x23 //BH1750
#define BH1750_MODE_OTH 0x20

int32_t Bh1750GetValue()
{
      uint8_t cmd[] = {BH1750_MODE_OTH};
      uint8_t buf[2];
  buf[0] = 0x00;
  HAL_I2C_Master_Transmit(&hi2c1, BH1750_ADDRESS << 1, cmd, 1, 1000);
  HAL_I2C_Master_Receive(&hi2c1, BH1750_ADDRESS << 1, buf, 2, 1000);

  int32_t value = (buf[0] << 8) | buf[1];
  value = value/1.2;

      return value;
}

参考