323 lines
9.5 KiB
C
323 lines
9.5 KiB
C
//==============================================================================
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// S E N S I R I O N AG, Laubisruetistr. 50, CH-8712 Staefa, Switzerland
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//==============================================================================
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// Project : SHT2x Sample Code (V1.2)
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// File : SHT2x.c
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// Author : MST
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// Controller: NEC V850/SG3 (uPD70F3740)
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// Compiler : IAR compiler for V850 (3.50A)
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// Brief : Sensor layer. Functions for sensor access
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//==============================================================================
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//---------- Includes ----------------------------------------------------------
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#include "SHT2x.h"
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#include "iot_i2c_api.h"
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#include "iot_io_api.h"
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extern void delay_sometime(void);
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extern int g_port;
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//==============================================================================
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u8t SHT2x_CheckCrc(u8t data[], u8t nbrOfBytes, u8t checksum)
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//==============================================================================
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{
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u8t crc = 0;
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u8t byteCtr;
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//calculates 8-Bit checksum with given polynomial
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for (byteCtr = 0; byteCtr < nbrOfBytes; ++byteCtr)
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{ crc ^= (data[byteCtr]);
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for (u8t bit = 8; bit > 0; --bit)
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{ if (crc & 0x80) crc = (crc << 1) ^ POLYNOMIAL;
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else crc = (crc << 1);
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}
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}
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if (crc != checksum) return CHECKSUM_ERROR;
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else return 0;
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}
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//===========================================================================
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u8t SHT2x_ReadUserRegister(u8t *pRegisterValue)
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//===========================================================================
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{
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u8t checksum; //variable for checksum byte
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u8t error=0; //variable for error code
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int ret ;
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char send_buf[6];
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send_buf[0] = USER_REG_R;
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//Read from memory location 1
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ret = iot_i2c_write(g_port,SHT2X_ADDR,(char *)send_buf, 1);
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if ( ret ) {
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iot_printf("write failed ret = %d.\n", ret);
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}
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if (iot_i2c_read(g_port, SHT2X_ADDR, send_buf, 2)) {
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iot_printf("read failed.\n");
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} else {
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for (int i = 0; i < 4; i++) {
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iot_printf("read[%d]=%02x\r\n", i, send_buf[i] & 0xff);
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}
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}
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*pRegisterValue = send_buf[0];
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checksum = send_buf[1];
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error |= SHT2x_CheckCrc (pRegisterValue, 1, checksum);
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if (error) {
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iot_printf("read user crc err\r\n");
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}
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return error;
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}
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//===========================================================================
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u8t SHT2x_WriteUserRegister(u8t *pRegisterValue)
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//===========================================================================
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{
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u8t error=0; //variable for error code
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int ret ;
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char send_buf[6];
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send_buf[0] = USER_REG_W;
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ret = iot_i2c_write(g_port,SHT2X_ADDR,(char *)send_buf, 1);
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if ( ret ) {
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iot_printf("write failed ret = %d.\n", ret);
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}
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return error;
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}
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#if 0
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//===========================================================================
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u8t SHT2x_MeasureHM(etSHT2xMeasureType eSHT2xMeasureType, nt16 *pMeasurand)
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//===========================================================================
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{
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u8t checksum; //checksum
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u8t data[2]; //data array for checksum verification
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u8t error=0; //error variable
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u16t i; //counting variable
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//-- write I2C sensor address and command --
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I2c_StartCondition();
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error |= I2c_WriteByte (I2C_ADR_W); // I2C Adr
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switch(eSHT2xMeasureType)
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{ case HUMIDITY: error |= I2c_WriteByte (TRIG_RH_MEASUREMENT_HM); break;
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case TEMP : error |= I2c_WriteByte (TRIG_T_MEASUREMENT_HM); break;
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default: break;
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}
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//-- wait until hold master is released --
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I2c_StartCondition();
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error |= I2c_WriteByte (I2C_ADR_R);
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SCL=HIGH; // set SCL I/O port as input
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for(i=0; i<1000; i++) // wait until master hold is released or
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{ DelayMicroSeconds(1000); // a timeout (~1s) is reached
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if (SCL_CONF==1) break;
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}
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//-- check for timeout --
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if(SCL_CONF==0) error |= TIME_OUT_ERROR;
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//-- read two data bytes and one checksum byte --
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pMeasurand->s16.u8H = data[0] = I2c_ReadByte(ACK);
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pMeasurand->s16.u8L = data[1] = I2c_ReadByte(ACK);
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checksum=I2c_ReadByte(NO_ACK);
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//-- verify checksum --
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error |= SHT2x_CheckCrc (data,2,checksum);
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I2c_StopCondition();
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return error;
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}
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#endif
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//===========================================================================
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u8t SHT2x_MeasurePoll(etSHT2xMeasureType eSHT2xMeasureType, nt16 *pMeasurand)
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//===========================================================================
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{
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u8t checksum; //checksum
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u8t error=0; //error variable
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//-- write I2C sensor address and command --
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int ret ;
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char send_buf[6];
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switch(eSHT2xMeasureType)
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{ case HUMIDITY: send_buf[0] = TRIG_RH_MEASUREMENT_POLL; break;
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case TEMP : send_buf[0] = TRIG_T_MEASUREMENT_POLL; break;
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default: break;
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}
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ret = iot_i2c_write(g_port,SHT2X_ADDR,(char *)send_buf, 1);
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if ( ret ) {
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iot_printf("write failed ret = %d.\n", ret);
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}
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delay_sometime();
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delay_sometime();
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delay_sometime();
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//-- read two data bytes and one checksum byte --
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if (iot_i2c_read(g_port, SHT2X_ADDR, send_buf, 3)) {
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iot_printf("read failed.\n");
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} else {
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//for (int i = 0; i < 3; i++) {
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//iot_printf("read[%d]=%02x\r\n", i, send_buf[i] & 0xff);
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//}
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}
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pMeasurand->s16.u8H = send_buf[0];
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pMeasurand->s16.u8L = send_buf[1];
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checksum = (u8t)send_buf[2];
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//-- verify checksum --
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error |= SHT2x_CheckCrc ((u8t *)send_buf, 2, checksum);
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if (error) {
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iot_printf("MeasurePoll crc err\r\n");
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}
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return error;
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}
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//===========================================================================
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u8t SHT2x_SoftReset()
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//===========================================================================
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{
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u8t error=0; //error variable
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int ret;
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char send_buf[1];
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send_buf[0] = SOFT_RESET;
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ret = iot_i2c_write(g_port,SHT2X_ADDR,(char *)send_buf, sizeof(send_buf));
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if ( ret ) {
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iot_printf("write failed ret = %d.\n", ret);
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}
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delay_sometime();
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return error;
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}
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//==============================================================================
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float SHT2x_CalcRH(u16t u16sRH)
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//==============================================================================
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{
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ft humidityRH; // variable for result
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u16sRH &= ~0x0003; // clear bits [1..0] (status bits)
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//-- calculate relative humidity [%RH] --
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humidityRH = -6.0 + 125.0/65536 * (ft)u16sRH; // RH= -6 + 125 * SRH/2^16
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return humidityRH;
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}
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//==============================================================================
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float SHT2x_CalcTemperatureC(u16t u16sT)
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//==============================================================================
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{
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ft temperatureC; // variable for result
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u16sT &= ~0x0003; // clear bits [1..0] (status bits)
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//-- calculate temperature [<5B>C] --
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temperatureC= -46.85 + 175.72/65536 *(ft)u16sT; //T= -46.85 + 175.72 * ST/2^16
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return temperatureC;
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}
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//==============================================================================
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u8t SHT2x_GetSerialNumber(u8t u8SerialNumber[])
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//==============================================================================
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{
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u8t error=0; //error variable
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int ret ;
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char send_buf[6];
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send_buf[0] = 0xFA;
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send_buf[1] = 0x0F;
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//Read from memory location 1
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ret = iot_i2c_write(g_port,SHT2X_ADDR,(char *)send_buf, 2);
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if ( ret ) {
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iot_printf("write failed ret = %d.\n", ret);
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}
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if (iot_i2c_read(g_port, SHT2X_ADDR, send_buf, 4)) {
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iot_printf("read failed.\n");
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} else {
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for (int i = 0; i < 4; i++) {
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iot_printf("read[%d]=%02x\r\n", i, send_buf[i] & 0xff);
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}
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}
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//Read from memory location 2
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send_buf[0] = 0xFC;
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send_buf[1] = 0xC9;
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//Read from memory location 1
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ret = iot_i2c_write(g_port,SHT2X_ADDR,(char *)send_buf, 2);
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if ( ret ) {
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iot_printf("write failed ret = %d.\n", ret);
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}
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if (iot_i2c_read(g_port, SHT2X_ADDR, send_buf, 6)) {
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iot_printf("read failed.\n");
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} else {
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for (int i = 0; i < 6; i++) {
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iot_printf("read[%d]=%02x\r\n", i, send_buf[i] & 0xff);
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}
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}
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return error;
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}
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void SHT2x_test_loop(void)
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{
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u8t error = 0; //variable for error code. For codes see system.h
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u8t userRegister; //variable for user register
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u8t serial_num[6] ;
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nt16 sT;
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nt16 sRH;
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ft temperatureC;
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ft humidityRH;
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SHT2x_SoftReset();
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SHT2x_GetSerialNumber(serial_num);
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// --- Set Resolution e.g. RH 10bit, Temp 13bit ---
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error |= SHT2x_ReadUserRegister(&userRegister); //get actual user reg
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userRegister = (userRegister & ~SHT2x_RES_MASK) | SHT2x_RES_10_13BIT;
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error |= SHT2x_WriteUserRegister(&userRegister); //write changed user reg
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while(1)
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{
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SHT2x_MeasurePoll(TEMP, &sT);
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//-- calculate humidity and temperature --
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temperatureC = SHT2x_CalcTemperatureC(sT.u16);
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delay_sometime();
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SHT2x_MeasurePoll(HUMIDITY, &sRH);
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humidityRH = SHT2x_CalcRH(sRH.u16);
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iot_printf("temp=%f, humidityRH=%f\r\n", temperatureC, humidityRH);
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delay_sometime();
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delay_sometime();
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delay_sometime();
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}
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}
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