86 lines
1.5 KiB
C
86 lines
1.5 KiB
C
/**
|
|
* @file bh1750.c
|
|
* @author Myth
|
|
* @version 0.1
|
|
* @date 2021.10.14
|
|
* @brief BH1750 驱动
|
|
*/
|
|
|
|
#include "systick.h"
|
|
|
|
#include "softi2c.h"
|
|
|
|
#include "bh1750.h"
|
|
|
|
#define SLAVE_ADDR_WR 0x46
|
|
#define SLAVE_ADDR_RD 0x47
|
|
|
|
#define I2C_Start SoftI2C_Start(&bh1750_i2c)
|
|
#define I2C_Stop SoftI2C_Stop(&bh1750_i2c)
|
|
#define I2C_WriteByte(__byte__) SoftI2C_WriteByte(&bh1750_i2c, __byte__)
|
|
#define I2C_ReadByte SoftI2C_ReadByte(&bh1750_i2c)
|
|
#define I2C_Ack SoftI2C_Ack(&bh1750_i2c)
|
|
#define I2C_NAck SoftI2C_NAck(&bh1750_i2c)
|
|
#define I2C_WaitAck SoftI2C_WaitAck(&bh1750_i2c)
|
|
|
|
SoftI2C_TypeDef bh1750_i2c;
|
|
|
|
/**
|
|
* @brief 初始化 BH1750
|
|
*/
|
|
void BH1750_Init(void)
|
|
{
|
|
bh1750_i2c.SDA_GPIO = BH1750_GPIO;
|
|
bh1750_i2c.SDA_Pin = BH1750_SDA_PIN;
|
|
|
|
bh1750_i2c.SCL_GPIO = BH1750_GPIO;
|
|
bh1750_i2c.SCL_Pin = BH1750_SCL_PIN;
|
|
|
|
bh1750_i2c.Delay_Time = 5;
|
|
|
|
SoftI2C_Init(&bh1750_i2c);
|
|
|
|
Delay_ms(80);
|
|
|
|
I2C_Start;
|
|
I2C_WriteByte(SLAVE_ADDR_WR);
|
|
I2C_WaitAck;
|
|
I2C_WriteByte(0x01);
|
|
I2C_WaitAck;
|
|
I2C_Stop;
|
|
}
|
|
|
|
/**
|
|
* @brief 读取 BH1750 数据
|
|
* @retval 读数
|
|
*/
|
|
float BH1750_Read(void)
|
|
{
|
|
uint8_t i;
|
|
uint8_t byte1;
|
|
uint8_t byte2;
|
|
|
|
I2C_Start;
|
|
I2C_WriteByte(SLAVE_ADDR_WR);
|
|
I2C_WaitAck;
|
|
I2C_WriteByte(0x10);
|
|
I2C_WaitAck;
|
|
I2C_Stop;
|
|
|
|
Delay_ms(180);
|
|
|
|
I2C_Start;
|
|
I2C_WriteByte(SLAVE_ADDR_RD);
|
|
I2C_WaitAck;
|
|
|
|
byte1 = I2C_ReadByte;
|
|
I2C_Ack;
|
|
|
|
byte2 = I2C_ReadByte;
|
|
I2C_NAck;
|
|
|
|
I2C_Stop;
|
|
|
|
return (float)((byte1 << 8) + byte2) / 1.2;
|
|
}
|