SHT3X.zip_SHT STM32_SHT31 湿度测量_SHT3X_STM32 SHT_stm32 sht3x

//============================================================================== // S E N S I R I O N AG, Laubisruetistr. 44, CH-8712 Staefa, Switzerland //============================================================================== // Project : SHT3x Sample Code (V1.0) // File : sht3x.c (V1.0) // Author : RFU // Date : 16-Jun-2014 // Controller: STM32F100RB // IDE : 猩ision V4.71.2.0 // Compiler : Armcc // Brief : Sensor Layer: Implementation of functions for sensor access. //============================================================================== //-- Includes ------------------------------------------------------------------ #include "sht3x.h" #include "iic.h" //-- Defines ------------------------------------------------------------------- // CRC #define POLYNOMIAL 0x131 // P(x) = x^8 + x^5 + x^4 + 1 = 100110001 //------------------------------------------------------------------------------ // IO-Pins /* -- adapt the defines for your uC -- */ //------------------------------------------------------------------------------ // Reset on port B, bit 12 #define RESET_LOW() (GPIOB->BSRR = 0x10000000) // set Reset to low #define RESET_HIGH() (GPIOB->BSRR = 0x00001000) // set Reset to high // Alert on port B, bit 10 #define ALERT_READ (GPIOB->IDR & 0x0400) // read Alert //------------------------------------------------------------------------------ //-- Global variables ---------------------------------------------------------- u8t _i2cWriteHeader=0x88; u8t _i2cReadHeader=0x89; //============================================================================== void SHT3X_Init(u8t i2cAdr){ /* -- adapt the init for your uC -- */ //============================================================================== /* // init I/O-pins RCC->APB2ENR |= 0x00000008; // I/O port B clock enabled // Alert on port B, bit 10 GPIOB->CRH &= 0xFFFFF0FF; // set floating input for Alert-Pin GPIOB->CRH |= 0x00000400; // // Reset on port B, bit 12 GPIOB->CRH &= 0xFFF0FFFF; // set push-pull output for Reset pin GPIOB->CRH |= 0x00010000; // RESET_LOW(); */ // I2c_Init(); // init I2C SHT3X_SetI2cAdr(i2cAdr); // // release reset // RESET_HIGH(); } //============================================================================== void SHT3X_SetI2cAdr(u8t i2cAdr){ //============================================================================== _i2cWriteHeader = i2cAdr << 1; _i2cReadHeader = _i2cWriteHeader | 0x01; } //============================================================================== u8t SHT3x_ReadSerialNumber(u32t *serialNbr){ //============================================================================== u8t error; // error code u16t serialNumWords[2]; error = SHT3X_StartWriteAccess(); // write "read serial number" command error |= SHT3X_WriteCommand(CMD_READ_SERIALNBR); // if no error, start read access if(error == NO_ERROR) error = SHT3X_StartReadAccess(); // if no error, read first serial number word if(error == NO_ERROR) error = SHT3X_Read2BytesAndCrc(&serialNumWords[0], ACK, 100); // if no error, read second serial number word if(error == NO_ERROR) error = SHT3X_Read2BytesAndCrc(&serialNumWords[1], NACK, 0); SHT3X_StopAccess(); // if no error, calc serial number as 32-bit integer if(error == NO_ERROR) { *serialNbr = (serialNumWords[0] << 16) | serialNumWords[1]; } return error; } //============================================================================== u8t SHT3X_ReadStatus(u16t *status){ //============================================================================== u8t error; // error code error = SHT3X_StartWriteAccess(); // if no error, write "read status" command if(error == NO_ERROR) error = SHT3X_WriteCommand(CMD_READ_STATUS); // if no error, start read access if(error == NO_ERROR) error = SHT3X_StartReadAccess(); // if no error, read status if(error == NO_ERROR) error = SHT3X_Read2BytesAndCrc(status, NACK, 0); SHT3X_StopAccess(); return error; } //============================================================================== u8t SHT3X_ClearAllAlertFlags(void){ //============================================================================== u8t error; // error code error = SHT3X_StartWriteAccess(); // if no error, write clear status register command if(error == NO_ERROR) error = SHT3X_WriteCommand(CMD_CLEAR_STATUS); SHT3X_StopAccess(); return error; } //============================================================================== u8t SHT3X_GetTempAndHumi(ft *temp, ft *humi, etRepeatab repeatab, etMode mode, u8t timeout){ //============================================================================== u8t error; switch(mode) { case MODE_CLKSTRETCH: // get temperature with clock stretching mode error = SHT3X_GetTempAndHumiClkStretch(temp, humi, repeatab, timeout); break; case MODE_POLLING: // get temperature with polling mode error = SHT3X_GetTempAndHumiPolling(temp, humi, repeatab, timeout); break; default: error = PARM_ERROR; break; } return error; } //============================================================================== u8t SHT3X_GetTempAndHumiClkStretch(ft *temp, ft *humi, etRepeatab repeatab, u8t timeout){ //============================================================================== u8t error; // error code u16t rawValueTemp; // temperature raw value from sensor u16t rawValueHumi; // humidity raw value from sensor error = SHT3X_StartWriteAccess(); // if no error ... if(error == NO_ERROR) { // start measurement in clock stretching mode // use depending on the required repeatability, the corresponding command switch(repeatab) { case REPEATAB_LOW: error = SHT3X_WriteCommand(CMD_MEAS_CLOCKSTR_L); break; case REPEATAB_MEDIUM: error = SHT3X_WriteCommand(CMD_MEAS_CLOCKSTR_M); break; case REPEATAB_HIGH: error = SHT3X_WriteCommand(CMD_MEAS_CLOCKSTR_H); break; default: error = PARM_ERROR; break; } } // if no error, start read access if(error == NO_ERROR) error = SHT3X_StartReadAccess(); // if no error, read temperature raw values if(error == NO_ERROR) error = SHT3X_Read2BytesAndCrc(&rawValueTemp, ACK, timeout); // if no error, read humidity raw values if(error == NO_ERROR) error = SHT3X_Read2BytesAndCrc(&rawValueHumi, NACK, 0); SHT3X_StopAccess(); // if no error, calculate temperature in 蚓 and humidity in %RH if(error == NO_ERROR) { *temp = SHT3X_CalcTemperature(rawValueTemp); *humi = SHT3X_CalcHumidity(rawValueHumi); } return error; } //============================================================================== u8t SHT3X_GetTempAndHumiPolling(ft *temp, ft *humi, etRepeatab repeatab, u8t timeout){ //============================================================================== u8t error; // error code u16t rawValueTemp; // temperature raw value from sensor u16t rawValueHumi; // humidity raw value from sensor error = SHT3X_StartWriteAccess(); // if no error ... if(error == NO_ERROR) { // start measurement in polling mode // use