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温湿度传感器驱动SHT85单片机STM32HAL库

温湿度传感器驱动SHT85单⽚机STM32HAL库功能介绍：读取传感器SHT85数据，转换成温度、湿度、饱和⽔蒸⽓含量。

注意事项：

1. SDA脚设置为开漏输出，外部上拉电阻10k。或者设置成推挽，软件切换SDA输⼊输出。

2. 调试时可适当加长延时时间。

3. 在while(1)循环之前调⽤ TH_Class_SHT85.init()，每隔1S调⽤⼀次TH_Class_SHT85.loop()。

代码

SHT85.h

#ifndef __SHT85_H__

#define __SHT85_H__

#include "main.h"

#define CRC_POLYNOMIAL 0x131 // P(x) = x^8 + x^5 + x^4 + 1 = 100110001

#define I2C_ADDR 0x44 //SHT85地址

/****************************错误码***************************/

#define NO_ERROR 0x00

#define ACK_ERROR 0x01

#define CHECKSUM_ERROR 0x02

易熔塞

#define TIMEOUT_ERROR 0x04

/****************************IIC错误码***************************/

typedef enum{

ACK = 0,

NO_ACK = 1,

}etI2cAck;

****************************CMD定义***************************/

typedef enum {

CMD_READ_SERIALNBR = 0x3780, // read serial number

CMD_READ_STATUS = 0xF32D, // read status register

CMD_CLEAR_STATUS = 0x3041, // clear status register

CMD_HEATER_ENABLE = 0x306D, // enabled heater

CMD_HEATER_DISABLE = 0x3066, // disable heater

CMD_SOFT_RESET = 0x30A2, // soft reset

CMD_MEAS_SINGLE_H = 0x2400, // single meas., high repeatability

CMD_MEAS_SINGLE_M = 0x240B, // single meas., medium repeatability

CMD_MEAS_SINGLE_L = 0x2416, // single meas., low repeatability

CMD_MEAS_PERI_05_H = 0x2032, // periodic meas. 0.5 mps, high repeatability

CMD_MEAS_PERI_05_M = 0x2024, // periodic meas. 0.5 mps, medium repeatability

CMD_MEAS_PERI_05_L = 0x202F, // periodic meas. 0.5 mps, low repeatability

CMD_MEAS_PERI_1_H = 0x2130, // periodic meas. 1 mps, high repeatability

CMD_MEAS_PERI_1_M = 0x2126, // periodic meas. 1 mps, medium repeatability

CMD_MEAS_PERI_1_L = 0x212D, // periodic meas. 1 mps, low repeatability

CMD_MEAS_PERI_2_H = 0x2236, // periodic meas. 2 mps, high repeatability

CMD_MEAS_PERI_2_M = 0x2220, // periodic meas. 2 mps, medium repeatability

CMD_MEAS_PERI_2_L = 0x222B, // periodic meas. 2 mps, low repeatability

CMD_MEAS_PERI_4_H = 0x2334, // periodic meas. 4 mps, high repeatability

CMD_MEAS_PERI_4_M = 0x2322, // periodic meas. 4 mps, medium repeatability

CMD_MEAS_PERI_4_L = 0x2329, // periodic meas. 4 mps, low repeatability

CMD_MEAS_PERI_10_H = 0x2737, // periodic meas. 10 mps, high repeatability

CMD_MEAS_PERI_10_M = 0x2721, // periodic meas. 10 mps, medium repeatability

CMD_MEAS_PERI_10_L = 0x272A, // periodic meas. 10 mps, low repeatability

CMD_FETCH_DATA = 0xE000, // readout measurements for periodic mode

CMD_BREAK = 0x3093, // stop periodic measurement

}etCommands;

// Single Shot Measurement Repeatability

typedef enum {

SINGLE_MEAS_LOW = CMD_MEAS_SINGLE_L, // low repeatability

SINGLE_MEAS_MEDIUM = CMD_MEAS_SINGLE_M, // medium repeatability

SINGLE_MEAS_HIGH = CMD_MEAS_SINGLE_H // high repeatability

}etSingleMeasureModes;

// Periodic Measurement Configurations

typedef enum {

PERI_MEAS_LOW_05_HZ = CMD_MEAS_PERI_05_L,

PERI_MEAS_LOW_1_HZ = CMD_MEAS_PERI_1_L,

PERI_MEAS_LOW_2_HZ = CMD_MEAS_PERI_2_L,

PERI_MEAS_LOW_4_HZ = CMD_MEAS_PERI_4_L,

PERI_MEAS_LOW_10_HZ = CMD_MEAS_PERI_10_L,

PERI_MEAS_MEDIUM_05_HZ = CMD_MEAS_PERI_05_M,

PERI_MEAS_MEDIUM_1_HZ = CMD_MEAS_PERI_1_M,

PERI_MEAS_MEDIUM_2_HZ = CMD_MEAS_PERI_2_M,

PERI_MEAS_MEDIUM_4_HZ = CMD_MEAS_PERI_4_M,

PERI_MEAS_MEDIUM_10_HZ = CMD_MEAS_PERI_10_M,

PERI_MEAS_HIGH_05_HZ = CMD_MEAS_PERI_05_H,

PERI_MEAS_HIGH_1_HZ = CMD_MEAS_PERI_1_H,

PERI_MEAS_HIGH_2_HZ = CMD_MEAS_PERI_2_H,

PERI_MEAS_HIGH_4_HZ = CMD_MEAS_PERI_4_H,

PERI_MEAS_HIGH_10_HZ = CMD_MEAS_PERI_10_H,

}etPeriodicMeasureModes;

/****************************温湿度传感器结构体定义**************************/

typedef struct _TH_Class{

u32 SerialNumber;//传感器SN号

float Temperature;//温度

float Humidity;//相对湿度

float H2O;//绝对湿度

void (*init)(void);//初始化函数指针

void (*loop)(void);//loop函数指针，循环读取温湿度，周期:1S

}TH_Class_t;

extern TH_Class_t TH_Class_SHT85;

#endif

SHT85.c

/********************************************

*Filename: SHT85.c

*Revised: Date: 06-22 14:42

*Author: SYMBEL

*Description: SHT85驱动

*********************************************/

#include "SHT85.h"

#include <stdbool.h>

/****************************IIC引脚定义**************************/

#define SHT85_SCL(x) HAL_GPIO_WritePin(SHT85_SCK_GPIO_Port, SHT85_SCK_Pin, x?GPIO_PIN_SET:GPIO_PIN_RESET) #define SHT85_SDA(x) HAL_GPIO_WritePin(SHT85_SDA_GPIO_Port, SHT85_SDA_Pin, x?GPIO_PIN_SET:GPIO_PIN_RESET) #define IS_SHT85_SDA() HAL_GPIO_ReadPin(SHT85_SDA_GPIO_Port, SHT85_SDA_Pin) //读取SDA脚电平

/****************************IIC引脚定义**************************/

落叶的忧伤/*****************************函数声明***************************/

static u8 StartWriteAccess(void);

static u8 StartReadAccess(void);

static void StopAccess(void);

static u8 WriteCommand(etCommands command);

static u8 Read2BytesAndCrc(uint16_t* data, bool finAck, uint8_t timeout); static uint8_t CalcCrc(uint8_t data[], uint8_t nbrOfBytes);

static u8 CheckCrc(uint8_t data[], uint8_t nbrOfBytes, uint8_t checksum); static float CalcTemperature(uint16_t rawValue);

static float CalcHumidity(uint16_t rawValue);

void SHT85_Init(void);

void SHT85_FSM(void);

/****************************结构体初始化**************************/娱乐之最强炮王系统

TH_Class_t TH_Class_SHT85 = {

.SerialNumber = 0,

.Temperature = 0.0f,

.Humidity = 0.0f,

.H2O = 0.0f,

.init = SHT85_Init,

newcom

.loop = SHT85_FSM,

};

/**********************************************************

*函数：DelayUs

*功能：延时1us

*参数：us：延时时间单位：us

*返回：⽆

*描述：⽆

**********************************************************/

static void DelayUs(u32 us)

{

for(int i=0; i<us; i++){

__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); __NOP();__NOP();__

NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); }

}

static void I2c_StartCondition(void)

{

SHT85_SDA(1);

SHT85_SCL(1);

DelayUs(3);

SHT85_SDA(0);

DelayUs(3);

SHT85_SCL(0);

DelayUs(3);

}

static void I2c_StopCondition(void)

{

SHT85_SDA(0);

SHT85_SCL(0);

DelayUs(2);

SHT85_SCL(1);

DelayUs(3);

SHT85_SDA(1);

static u8 I2c_WriteByte(uint8_t txByte)

{

uint8_t mask,error=0,i;

// SHT85_SDA(0);

for(i=1;i<20;i++);

for(mask=0x80; mask>0; mask>>=1)//shift bit for masking (8 times) {

if ((mask & txByte) == 0)

徐湘婷下载

SHT85_SDA(0); //masking txByte, write bit to SDA-Line

else

SHT85_SDA(1);

DelayUs(1); //data hold time(t_HD;DAT)

SHT85_SCL(1); //generate clock pulse on SCL

DelayUs(1); //data set-up time (t_SU;DAT)

SHT85_SCL(0);

DelayUs(1); //SCL high time (t_HIGH)

}

error = IS_SHT85_SDA(); //release SDA-line

SHT85_SCL(1); //clk #9 for ack

DelayUs(1); //data set-up time (t_SU;DAT)

error = IS_SHT85_SDA();

SHT85_SCL(0);

DelayUs(3); //wait time to see byte package on scope

return error; //return error code

}

2014福建高考理综static uint8_t I2c_ReadByte(etI2cAck ack)

{

uint8_t mask,rxByte=0,i,rxb;

SHT85_SDA(1);

rxb = IS_SHT85_SDA(); //release SDA-line

for(i=1;i<20;i++);

for(mask=0x80; mask>0; mask>>=1)//shift bit for masking (8 times) {

SHT85_SCL(1); //start clock on SCL-line

DelayUs(2); //data set-up time (t_SU;DAT)

rxb = IS_SHT85_SDA();

if(rxb)

rxByte=(rxByte | mask); //read bit

SHT85_SCL(0);

DelayUs(2); //data hold time(t_HD;DAT)

}

if(ack == ACK)

SHT85_SDA(0);

else

SHT85_SDA(1);

DelayUs(2); //data set-up time (t_SU;DAT)

SHT85_SCL(1); //clk #9 for ack

DelayUs(5); //SCL high time (t_HIGH)

SHT85_SCL(0);

//SHT85_SDA(1); //release SDA-line

DelayUs(2); //wait time to see byte package on scope

return rxByte; //return error code

}

u8 I2c_GeneralCallReset(void)

{

I2c_StartCondition();

error = I2c_WriteByte(0x00);

if(error == NO_ERROR) {

error = I2c_WriteByte(0x06);

}

return error;

}

u8 SHT85_ReadSerialNumber(uint32_t* serialNumber)

{

u8 error; // error code

uint16_t serialNumWords[2];

error = StartWriteAccess();

/ write "read serial number" command

if(error == NO_ERROR) {

error = WriteCommand(CMD_READ_SERIALNBR);

}

// if no error, start read access

if(error == NO_ERROR) {

error = StartReadAccess();

}

// if no error, read first serial number word

if(error == NO_ERROR) {

error = Read2BytesAndCrc(&serialNumWords[0], true, 100);

}

// if no error, read second serial number word

if(error == NO_ERROR) {

error = Read2BytesAndCrc(&serialNumWords[1], false, 0);

}

StopAccess();

// if no error, calc serial number as 32-bit integer

if(error == NO_ERROR) {

*serialNumber = (serialNumWords[0] << 16) | serialNumWords[1]; }

return error;

}

u8 SHT85_ReadStatus(uint16_t* status)

{

u8 error; // error code

error = StartWriteAccess();

// if no error, write "read status" command

if(error == NO_ERROR) {

error = WriteCommand(CMD_READ_STATUS);

}

// if no error, start read access

if(error == NO_ERROR) {

error = StartReadAccess();

}

// if no error, read status

if(error == NO_ERROR) {

error = Read2BytesAndCrc(status, false, 0);

}

StopAccess();

return error;

}

u8 SHT85_ClearAllAlertFlags(void)

{

u8 error; // error code

error = StartWriteAccess();

// if no error, write clear status register command

if(error == NO_ERROR) {

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