开发环境
单片机:STM32F103C8T6
光照度传感器:BH1750
IDE:KEIL+STM32CUBEMX
单片机配置
1、STM32CUBEMX
BH1750代码
1、头文件
/*
*************************************************
BH1750光照数据计算(LUX)
LUX = 读取数据/1.2
例如:
读取值为0x56,0x78
LUX = 0X5678 / 1.2 = 22136/1.2 = 18447*************************************************
*/#ifndef __BH1750_H
#define __BH1750_H#include "main.h"#define BH1750_PORT hi2c2 /*使用端口*/#define BH1750_ADDRESS 0x46 /*ADDRESS引脚接地时地址为0x46,接电源时地址为0xB8*/#define BH1750_POW_OFF 0X00
#define BH1750_POW_ON 0X01
#define BH1750_POW_RST 0X07
#define BH1750_CONT_HI_RSLT_1 0X10 /*连续测量,1lx精度开始测量,周期120ms*/
#define BH1750_CONT_HI_RSLT_2 0X11 /*连续测量,0.5lx精度开始测量,周期120ms*/
#define BH1750_CONT_LOW_RSLT 0X13 /*连续测量,4lx精度开始测量,周期16ms*/
#define BH1750_ONE_HI_RSLT_1 0X20 /*一次测量,1lx精度开始测量,周期120ms,测量完后自动进入POWER DOWN*/
#define BH1750_ONE_HI_RSLT_2 0X21 /*一次测量,0.5lx精度开始测量,周期120ms,测量完后自动进入POWER DOWN*/
#define BH1750_ONE_LOW_RSLT 0X23 /*一次测量,4lx精度开始测量,周期16ms,测量完后自动进入POWER DOWN*/HAL_StatusTypeDef BH1750_Init(void);HAL_StatusTypeDef BH1750_WriteOpecode(uint8_t* pData, uint16_t size);
HAL_StatusTypeDef BH1750_ReadData(uint8_t* pData, uint16_t size);#endif
2、C文件
#include "bh1750.h"
#include "i2c.h"HAL_StatusTypeDef BH1750_Init(void)
{uint8_t opecode = 0x01;return (BH1750_WriteOpecode(&opecode, 1));
}/*
*************************************************
功能:写BH1750操作码到芯片,控制模式
*************************************************
*/
HAL_StatusTypeDef BH1750_WriteOpecode(uint8_t* pData, uint16_t size)
{HAL_StatusTypeDef status = HAL_OK;status = HAL_I2C_Master_Transmit(&BH1750_PORT, BH1750_ADDRESS,pData, size, 1);return status;
}
/*
*************************************************
功能:读取BH1750的数据,存放到pData中
*************************************************
*/HAL_StatusTypeDef BH1750_ReadData(uint8_t* pData, uint16_t size)
{HAL_StatusTypeDef status = HAL_OK;status = HAL_I2C_Master_Receive(&BH1750_PORT, BH1750_ADDRESS+1,pData, size, 1);return status;
}
3、主函数操作BH1750
/* USER CODE BEGIN 2 */BH1750_Init(); /*初始化BH1750,上电*/opeCode= BH1750_CONT_HI_RSLT_1; /*配置工作模式为连续高分辨率转换,1lx精度,120ms转换周期*/BH1750_WriteOpecode(&opeCode,1);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */HAL_Delay(200);BH1750_ReadData(g_ucaDataBuff,2);/*获取照度数据*/ftmp = (g_ucaDataBuff[0]<<8 | g_ucaDataBuff[1]) / 1.2f + 0.5f;/*转换照度数据*/g_usLux = (uint16_t)ftmp;HAL_Delay(500);}/* USER CODE END 3 */