温湿度传感器驱动SHT85 单片机STM32 HAL库
2024-06-01 10:08:24
- 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：
- 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。
- 调试时可适当加长延时时间。
- 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驱动.7z
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
#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 numberCMD_READ_STATUS = 0xF32D, // read status registerCMD_CLEAR_STATUS = 0x3041, // clear status registerCMD_HEATER_ENABLE = 0x306D, // enabled heaterCMD_HEATER_DISABLE = 0x3066, // disable heaterCMD_SOFT_RESET = 0x30A2, // soft resetCMD_MEAS_SINGLE_H = 0x2400, // single meas., high repeatabilityCMD_MEAS_SINGLE_M = 0x240B, // single meas., medium repeatabilityCMD_MEAS_SINGLE_L = 0x2416, // single meas., low repeatabilityCMD_MEAS_PERI_05_H = 0x2032, // periodic meas. 0.5 mps, high repeatabilityCMD_MEAS_PERI_05_M = 0x2024, // periodic meas. 0.5 mps, medium repeatabilityCMD_MEAS_PERI_05_L = 0x202F, // periodic meas. 0.5 mps, low repeatabilityCMD_MEAS_PERI_1_H = 0x2130, // periodic meas. 1 mps, high repeatabilityCMD_MEAS_PERI_1_M = 0x2126, // periodic meas. 1 mps, medium repeatabilityCMD_MEAS_PERI_1_L = 0x212D, // periodic meas. 1 mps, low repeatabilityCMD_MEAS_PERI_2_H = 0x2236, // periodic meas. 2 mps, high repeatabilityCMD_MEAS_PERI_2_M = 0x2220, // periodic meas. 2 mps, medium repeatabilityCMD_MEAS_PERI_2_L = 0x222B, // periodic meas. 2 mps, low repeatabilityCMD_MEAS_PERI_4_H = 0x2334, // periodic meas. 4 mps, high repeatabilityCMD_MEAS_PERI_4_M = 0x2322, // periodic meas. 4 mps, medium repeatabilityCMD_MEAS_PERI_4_L = 0x2329, // periodic meas. 4 mps, low repeatabilityCMD_MEAS_PERI_10_H = 0x2737, // periodic meas. 10 mps, high repeatabilityCMD_MEAS_PERI_10_M = 0x2721, // periodic meas. 10 mps, medium repeatabilityCMD_MEAS_PERI_10_L = 0x272A, // periodic meas. 10 mps, low repeatabilityCMD_FETCH_DATA = 0xE000, // readout measurements for periodic modeCMD_BREAK = 0x3093, // stop periodic measurement
}etCommands;// Single Shot Measurement Repeatability
typedef enum {SINGLE_MEAS_LOW = CMD_MEAS_SINGLE_L, // low repeatabilitySINGLE_MEAS_MEDIUM = CMD_MEAS_SINGLE_M, // medium repeatabilitySINGLE_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**************************//*****************************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**************************/
TH_Class_t TH_Class_SHT85 = {.SerialNumber = 0,.Temperature = 0.0f,.Humidity = 0.0f,.H2O = 0.0f,.init = SHT85_Init,.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);DelayUs(3);
}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) SHT85_SDA(0); //masking txByte, write bit to SDA-Lineelse SHT85_SDA(1);DelayUs(1); //data hold time(t_HD;DAT)SHT85_SCL(1); //generate clock pulse on SCLDelayUs(1); //data set-up time (t_SU;DAT)SHT85_SCL(0);DelayUs(1); //SCL high time (t_HIGH)}error = IS_SHT85_SDA(); //release SDA-lineSHT85_SCL(1); //clk #9 for ackDelayUs(1); //data set-up time (t_SU;DAT)error = IS_SHT85_SDA();SHT85_SCL(0);DelayUs(3); //wait time to see byte package on scopereturn error; //return error code
}static uint8_t I2c_ReadByte(etI2cAck ack)
{uint8_t mask,rxByte=0,i,rxb;SHT85_SDA(1);rxb = IS_SHT85_SDA(); //release SDA-linefor(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-lineDelayUs(2); //data set-up time (t_SU;DAT)rxb = IS_SHT85_SDA();if(rxb) rxByte=(rxByte | mask); //read bitSHT85_SCL(0);DelayUs(2); //data hold time(t_HD;DAT)}if(ack == ACK)SHT85_SDA(0);elseSHT85_SDA(1);DelayUs(2); //data set-up time (t_SU;DAT)SHT85_SCL(1); //clk #9 for ackDelayUs(5); //SCL high time (t_HIGH)SHT85_SCL(0);//SHT85_SDA(1); //release SDA-lineDelayUs(2); //wait time to see byte package on scopereturn rxByte; //return error code
}u8 I2c_GeneralCallReset(void)
{u8 error;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 codeuint16_t serialNumWords[2];error = StartWriteAccess();// write "read serial number" commandif(error == NO_ERROR) {error = WriteCommand(CMD_READ_SERIALNBR);}// if no error, start read accessif(error == NO_ERROR) {error = StartReadAccess();}// if no error, read first serial number wordif(error == NO_ERROR) {error = Read2BytesAndCrc(&serialNumWords[0], true, 100);}// if no error, read second serial number wordif(error == NO_ERROR) {error = Read2BytesAndCrc(&serialNumWords[1], false, 0);}StopAccess();// if no error, calc serial number as 32-bit integerif(error == NO_ERROR) {*serialNumber = (serialNumWords[0] << 16) | serialNumWords[1];}return error;
}u8 SHT85_ReadStatus(uint16_t* status)
{u8 error; // error codeerror = StartWriteAccess();// if no error, write "read status" commandif(error == NO_ERROR) {error = WriteCommand(CMD_READ_STATUS);}// if no error, start read accessif(error == NO_ERROR) {error = StartReadAccess();}// if no error, read statusif(error == NO_ERROR) {error = Read2BytesAndCrc(status, false, 0);}StopAccess();return error;
}u8 SHT85_ClearAllAlertFlags(void)
{u8 error; // error codeerror = StartWriteAccess();// if no error, write clear status register commandif(error == NO_ERROR) {error = WriteCommand(CMD_CLEAR_STATUS);}StopAccess();return error;
}u8 SHT85_SingleMeasurment(float* temperature, float* humidity, etSingleMeasureModes measureMode, uint8_t timeout)
{u8 error; // error codeuint16_t rawValueTemp; // temperature raw value from sensoruint16_t rawValueHumi; // humidity raw value from sensorerror = StartWriteAccess();// if no errorif(error == NO_ERROR) {// start measurementerror = WriteCommand((etCommands)measureMode);}// if no error, wait until measurement readyif(error == NO_ERROR) {// poll every 1ms for measurement ready until timeoutwhile(timeout--) {// check if the measurement has finishederror = StartReadAccess();// if measurement has finished -> exit loopif(error == NO_ERROR) break;// delay 1msDelayUs(1000);}// check for timeout errorif(timeout == 0) {error = TIMEOUT_ERROR;}}// if no error, read temperature and humidity raw valuesif(error == NO_ERROR) {error |= Read2BytesAndCrc(&rawValueTemp, true, 0);error |= Read2BytesAndCrc(&rawValueHumi, false, 0);}StopAccess();// if no error, calculate temperature in °C and humidity in %RHif(error == NO_ERROR) {*temperature = CalcTemperature(rawValueTemp);*humidity = CalcHumidity(rawValueHumi);}return error;
}u8 SHT85_StartPeriodicMeasurment(etPeriodicMeasureModes measureMode)
{u8 error; // error codeerror = StartWriteAccess();// if no error, start periodic measurement if(error == NO_ERROR) {error = WriteCommand((etCommands)measureMode);}StopAccess();return error;
}u8 SHT85_StopPeriodicMeasurment(void)
{u8 error; // error codeerror = StartWriteAccess();// if no error, write breake commandif(error == NO_ERROR) {error = WriteCommand(CMD_BREAK);}StopAccess();return error;
}u8 SHT85_ReadMeasurementBuffer(float* temperature, float* humidity)
{u8 error; // error codeuint16_t rawValueTemp; // raw temperature from sensoruint16_t rawValueHumi; // raw humidity from sensorerror = StartWriteAccess();// if no error, read measurementsif(error == NO_ERROR) {error = WriteCommand(CMD_FETCH_DATA);}if(error == NO_ERROR) {error = StartReadAccess(); }if(error == NO_ERROR) {error = Read2BytesAndCrc(&rawValueTemp, true, 0);}if(error == NO_ERROR) {error = Read2BytesAndCrc(&rawValueHumi, false, 0);}// if no error, calculate temperature in °C and humidity in %RHif(error == NO_ERROR) {*temperature = CalcTemperature(rawValueTemp);*humidity = CalcHumidity(rawValueHumi);}StopAccess();return error;
}u8 SHT85_EnableHeater(void)
{u8 error; // error codeerror = StartWriteAccess();// if no error, write heater enable commandif(error == NO_ERROR) {error = WriteCommand(CMD_HEATER_ENABLE);}StopAccess();return error;
}u8 SHT85_DisableHeater(void)
{u8 error; // error codeerror = StartWriteAccess();// if no error, write heater disable commandif(error == NO_ERROR) {error = WriteCommand(CMD_HEATER_DISABLE);}StopAccess();return error;
}u8 SHT85_SoftReset(void)
{u8 error; // error codeerror = StartWriteAccess();// write reset commandif(error == NO_ERROR) {error = WriteCommand(CMD_SOFT_RESET);}StopAccess();// if no error, wait 50 ms after resetif(error == NO_ERROR) {DelayUs(50000);}return error;
}static u8 StartWriteAccess(void)
{u8 error; // error code// write a start conditionI2c_StartCondition();// write the sensor I2C address with the write flagerror = I2c_WriteByte(I2C_ADDR << 1);return error;
}static u8 StartReadAccess(void)
{u8 error; // error code// write a start conditionI2c_StartCondition();// write the sensor I2C address with the read flagerror = I2c_WriteByte(I2C_ADDR << 1|0x01);return error;
}static void StopAccess(void)
{// write a stop conditionI2c_StopCondition();
}static u8 WriteCommand(etCommands command)
{u8 error; // error code// write the upper 8 bits of the command to the sensorerror = I2c_WriteByte(command >> 8);// write the lower 8 bits of the command to the sensorerror |= I2c_WriteByte(command & 0xFF);return error;
}static u8 Read2BytesAndCrc(uint16_t* data, bool finAck, uint8_t timeout)
{u8 error; // error codeuint8_t bytes[2]; // read data arrayuint8_t checksum; // checksum byte// read two data bytes and one checksum bytebytes[0] = I2c_ReadByte(ACK);bytes[1] = I2c_ReadByte(ACK);checksum = I2c_ReadByte(finAck ? ACK : NO_ACK);// verify checksumerror = CheckCrc(bytes, 2, checksum);// combine the two bytes to a 16-bit value*data = (bytes[0] << 8) | bytes[1];return error;
}static uint8_t CalcCrc(uint8_t data[], uint8_t nbrOfBytes)
{uint8_t bit; // bit maskuint8_t crc = 0xFF; // calculated checksumuint8_t byteCtr; // byte counter// calculates 8-Bit checksum with given polynomialfor(byteCtr = 0; byteCtr < nbrOfBytes; byteCtr++) {crc ^= (data[byteCtr]);for(bit = 8; bit > 0; --bit) {if(crc & 0x80) {crc = (crc << 1) ^ CRC_POLYNOMIAL;} else {crc = (crc << 1);}}}return crc;
}static u8 CheckCrc(uint8_t data[], uint8_t nbrOfBytes, uint8_t checksum)
{// calculates 8-Bit checksumuint8_t crc = CalcCrc(data, nbrOfBytes);// verify checksumreturn (crc != checksum) ? CHECKSUM_ERROR : NO_ERROR;
}/**********************************************************
*函数：CalcTemperature
*功能：温度转换
*参数：rawValue：温度采样值
*返回：温度，单位℃
*描述：
**********************************************************/
static float CalcTemperature(uint16_t rawValue)
{// calculate temperature [°C]// T = -45 + 175 * rawValue / (2^16-1)return 175.0f * (float)rawValue / 65535.0f - 45.0f;
}/**********************************************************
*函数：CalcHumidity
*功能：相对湿度转换
*参数：rawValue：相对湿度采样值
*返回：相对湿度，单位%
*描述：
**********************************************************/
static float CalcHumidity(uint16_t rawValue)
{// calculate relative humidity [%RH]// RH = rawValue / (2^16-1) * 100return 100.0f * (float)rawValue / 65535.0f;
}/**********************************************************
*函数：FnTandRHToH2O
*功能：饱和水蒸气含量计算
*参数：nInTemp：温度，单位℃
* nInRH： 相对湿度，单位%
*返回：饱和水蒸气含量，单位℃
*描述：
**********************************************************/
static float FnTandRHToH2O(float nInTemp, float nInRH)
{float fCnH2O; //H2O含量float fCnH2OMax;float fTemp; fTemp = nInTemp;fCnH2OMax = 0.0000008734* fTemp* fTemp* fTemp - 0.0000013617* fTemp* fTemp+ 0.0004784740* fTemp+ 0.0068091716;fCnH2O = nInRH*fCnH2OMax;return(fCnH2O);
}/**********************************************************
*函数：SHT85_Init
*功能：SHT85初始化
*参数：无
*返回：无
*描述：IIC引脚初始化，读取SN，配置测量频率。
**********************************************************/
void SHT85_Init(void)
{/*IIC引脚初始化。此程序使用STM32 HAL库，已在main()初始化*//*读取SN*/SHT85_ReadSerialNumber(&TH_Class_SHT85.SerialNumber);/*设置测量频率*/SHT85_StartPeriodicMeasurment(PERI_MEAS_MEDIUM_10_HZ);
}/**********************************************************
*函数：SHT85_FSM
*功能：SHT85 loop函数
*参数：无
*返回：无
*描述：读取温度、相对湿度、计算饱和水蒸气含量。建议执行频率1Hz。
**********************************************************/
void SHT85_FSM(void)
{/*读取温度、相对湿度*/SHT85_ReadMeasurementBuffer(&TH_Class_SHT85.Temperature, &TH_Class_SHT85.Humidity);/*计算饱和水蒸气含量*/TH_Class_SHT85.H2O = FnTandRHToH2O(TH_Class_SHT85.Temperature, TH_Class_SHT85.Humidity);
}
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