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ATxmega_I2C_LCD.jpg
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ATxmega_I2C_LCD.jpg
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ATxmega_I2C_LCD_SHT2x.jpg
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ATxmega_I2C_LCD_SHT2x.jpg
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I2C LCD interface.pdf
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I2C LCD interface.pdf
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I2C_SHT2x.c
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I2C_SHT2x.c
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/*!
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* \file I2C_SHT2x.c
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* \author Patrick Taling (not the original author from the original code of SENSIRION AG)
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* \date 31/03/2017
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* \version 1.0
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*
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* \brief Simple I2C SHT2x library to measure relative humidity and temperature and write it to an I2C LCD with the ATxmega256a3u.
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*
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* \details The file I2C_SHT2x.c is the library for the SHT2x humidity and temperature sensor
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*
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* The library needs the i2c library from w.e.dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
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* For i2c.c use code 21.8 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
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* For i2c.h use code 21.9 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
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*
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* The libraby needs some parts of the the SHT2x library from SENIRION from https://www.sensirion.com/en/products/humidity-sensors/humidity-temperature-sensor-sht2x-digital-i2c-accurate/
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* The libraby can be download from: https://www.sensirion.com/en/products/all-documents-of-sensirions-humidity-sensors-for-download/
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* Go to SHT2x/ Sample Code SHT21 and download the zip file Sensirion_Humidity_Sensors_SHT21_Sample_Code_C-file
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*
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* \note the following files aren't fully used. Most parts are used in other .c of .h files or disabled.
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* DisplayDip204.C, DisplayDip204.h,
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* I2C_HAL.c, I2C_HAL.h,
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* System.c, System.h and
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* io70f3740.h.
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* \note for the use of two SHT2X you should use different IOs for SDA or additional hardware such as I2C multiplexer.
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* The adress of the SHT2x can’t be changed.
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*
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*
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* \ORIGINAL AUTHOR INFORMATION
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* ==============================================================================
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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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*
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*
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* \verbatim
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#include <I2C_SHT2x.h>
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#include <i2c.h>
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#include <Typedefs.h>
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\endverbatim
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* \par
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*
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* \note An AVR-project can use multiple I2C's. One shoud take care that
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* in different source files there are no multiple I2C
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* definitions for the same I2C.
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*/
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#define F_CPU 2000000UL
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#include "I2C_SHT2x.h"
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#include "i2c.h"
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#include "Typedefs.h"
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#include <util/delay.h>
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#include <assert.h>
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#include <math.h>
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//==============================================================================
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uint8_t i2c_SHT2x_CheckCrc(uint8_t data[], uint8_t nbrOfBytes, uint8_t checksum)
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//==============================================================================
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{
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uint8_t crc = 0;
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uint8_t 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 (uint8_t 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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uint8_t i2c_SHT2x_ReadUserRegister(uint8_t *pRegisterValue)
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//===========================================================================
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{
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uint8_t checksum;
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uint8_t error=0;
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 0);
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error |= i2c_write(&TWIE, USER_REG_R);
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i2c_stop(&TWIE);
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 1);
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*pRegisterValue = i2c_read(&TWIE, I2C_ACK);
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checksum=i2c_read(&TWIE, I2C_NACK);
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error |= i2c_SHT2x_CheckCrc (pRegisterValue,1,checksum);
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i2c_stop(&TWIE);
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return error;
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}
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//===========================================================================
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uint8_t i2c_SHT2x_WriteUserRegister(uint8_t *pRegisterValue)
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//===========================================================================
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{
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uint8_t error=0;
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_delay_ms(2000);
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 0);
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error |= i2c_write(&TWIE, USER_REG_W);
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error |= i2c_write(&TWIE, *pRegisterValue);
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i2c_stop(&TWIE);
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return error;
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}
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//===========================================================================
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uint8_t i2c_SHT2x_MeasureHM(etSHT2xMeasureType eSHT2xMeasureType, nt16 *pMeasurand)
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//===========================================================================
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{
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uint8_t checksum;
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uint8_t data[2];
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uint8_t error=0;
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//-- write I2C sensor address and command --
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 0);
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switch(eSHT2xMeasureType)
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{ case HUMIDITY: error |= i2c_write(&TWIE, TRIG_RH_MEASUREMENT_HM); break;
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case TEMP: error |= i2c_write(&TWIE, TRIG_T_MEASUREMENT_HM); break;
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default: assert(0);
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}
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i2c_stop(&TWIE);
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//-- wait until hold master is released --
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 1);
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//-- read two data bytes and one checksum byte --
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pMeasurand->s16.u8H = data[0] = i2c_read(&TWIE, I2C_ACK);
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pMeasurand->s16.u8L = data[1] = i2c_read(&TWIE, I2C_ACK);
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checksum= i2c_read(&TWIE, I2C_NACK);
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//-- verify checksum --
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error |= i2c_SHT2x_CheckCrc (data,2,checksum);
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i2c_stop(&TWIE);
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return error;
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}
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//===========================================================================
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uint8_t i2c_SHT2x_MeasurePoll(etSHT2xMeasureType eSHT2xMeasureType, nt16 *pMeasurand)
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//--- Disabled due to error in TEMP ---
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//--- measuring TEMP doesn't work after the do while loop ---
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//===========================================================================
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{
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uint8_t checksum;
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uint8_t data[2];
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uint8_t error=0;
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uint16_t i=0;
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//-- write I2C sensor address and command --
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 0); // I2C Adr
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switch(eSHT2xMeasureType)
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{ case HUMIDITY: error |= i2c_write(&TWIE, TRIG_RH_MEASUREMENT_POLL); break;
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case TEMP: error |= i2c_write(&TWIE, TRIG_T_MEASUREMENT_POLL); break;
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default: assert(0);
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}
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_delay_us(20);
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i2c_stop(&TWIE);
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//-- poll every 10ms for measurement ready. Timeout after 20 retries (200ms)--
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do
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{
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_delay_us(10000); //delay 10ms Max delay is 0.2s (20*10ms = 200ms)
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if(i++ >= 20) break;
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} while(i2c_start(&TWIE, I2C_SHT2x_ADR, 1) == ACK_ERROR);
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if (i>=20) 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_read(&TWIE, I2C_ACK);
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pMeasurand->s16.u8L = data[1] = i2c_read(&TWIE, I2C_ACK);
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checksum= i2c_read(&TWIE, I2C_NACK);
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//-- verify checksum --
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error |= i2c_SHT2x_CheckCrc (data,2,checksum);
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i2c_stop(&TWIE);
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return error;
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}
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//===========================================================================
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uint8_t i2c_SHT2x_SoftReset()
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//===========================================================================
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{
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uint8_t error=0;
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 0);
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error |= i2c_write(&TWIE, SOFT_RESET);
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i2c_stop(&TWIE);
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_delay_ms(15);
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return error;
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}
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//==============================================================================
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float i2c_SHT2x_CalcRH(uint16_t sRH)
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// --- The original formula from SENSIRION is wrong! ---
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//==============================================================================
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{
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float humidityRH;
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sRH &= ~0x0003;
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//-- calculate relative humidity [%RH] --
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humidityRH = (float)sRH / RESOLUTION_16; //RH = -6 + 125 * sRH/2^16;
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humidityRH = humidityRH * CONSTANT_125;
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humidityRH = humidityRH - CONSTANT_6;
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return humidityRH;
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}
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//==============================================================================
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float i2c_SHT2x_CalcTemperatureC(uint16_t sT)
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// --- The original formula from SENSIRION is wrong! ---
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//==============================================================================
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{
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float temperatureC;
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sT &= ~0x0003;
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//-- calculate temperature [°C] --
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temperatureC = (float)sT / RESOLUTION_16; //T= -46.85 + 175.72 * ST/2^16
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temperatureC = temperatureC * CONSTANT_175_72;
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temperatureC = temperatureC - CONSTANT_46_85;
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return temperatureC;
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}
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//==============================================================================
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uint8_t i2c_SHT2x_GetSerialNumber(uint8_t SerialNumber[])
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//==============================================================================
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{
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uint8_t error=0; //error variable
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//Read from memory location 1
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 0); //I2C address
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error |= i2c_write(&TWIE, CMD_CHIP_MEMORY_LOC_1); //Command for readout on-chip memory
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error |= i2c_write(&TWIE, ADR_CHIP_MEMORY_LOC_1); //on-chip memory address
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i2c_stop(&TWIE);
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 1); //I2C read address
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SerialNumber[5] = i2c_read(&TWIE, I2C_ACK); //Read SNB_3
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i2c_read(&TWIE, I2C_ACK); //Read CRC SNB_3 (CRC is not analyzed)
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SerialNumber[4] = i2c_read(&TWIE, I2C_ACK); //Read SNB_2
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i2c_read(&TWIE, I2C_ACK); //Read CRC SNB_2 (CRC is not analyzed)
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SerialNumber[3] = i2c_read(&TWIE, I2C_ACK); //Read SNB_1
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i2c_read(&TWIE, I2C_ACK);; //Read CRC SNB_1 (CRC is not analyzed)
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SerialNumber[2] = i2c_read(&TWIE, I2C_ACK); //Read SNB_0
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i2c_read(&TWIE, I2C_NACK); //Read CRC SNB_0 (CRC is not analyzed)
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i2c_stop(&TWIE);
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//Read from memory location 2
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 0); //I2C address
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error |= i2c_write(&TWIE, CMD_CHIP_MEMORY_LOC_2); //Command for readout on-chip memory
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error |= i2c_write(&TWIE, ADR_CHIP_MEMORY_LOC_2); //on-chip memory address
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i2c_stop(&TWIE);
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error |= i2c_start(&TWIE, I2C_SHT2x_ADR, 1); //I2C address
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SerialNumber[1] = i2c_read(&TWIE, I2C_ACK); //Read SNC_1
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SerialNumber[0] = i2c_read(&TWIE, I2C_ACK); //Read SNC_0
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i2c_read(&TWIE, I2C_ACK); //Read CRC SNC0/1 (CRC is not analyzed)
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SerialNumber[7] = i2c_read(&TWIE, I2C_ACK); //Read SNA_1
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SerialNumber[6] = i2c_read(&TWIE, I2C_ACK); //Read SNA_0
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i2c_read(&TWIE, I2C_NACK); //Read CRC SNA0/1 (CRC is not analyzed)
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i2c_stop(&TWIE);
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return error;
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}
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127
I2C_SHT2x.h
Normal file
127
I2C_SHT2x.h
Normal file
@ -0,0 +1,127 @@
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/*!
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* \file I2C_SHT2x.h
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* \author Patrick Taling (not the original author from the original code of SENSIRION AG)
|
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* \date 31/03/2017
|
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* \version 1.0
|
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*
|
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* \brief Simple I2C SHT2x library to measure relative humidity and temperature and write it to an I2C LCD with the ATxmega256a3u.
|
||||
*
|
||||
* \details The file I2C_SHT2x.h is the library for the SHT2x humidity and temperature sensor
|
||||
*
|
||||
* The library needs the i2c library from w.e.dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
|
||||
* For i2c.c use code 21.8 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
* For i2c.h use code 21.9 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
*
|
||||
* The libraby needs some parts of the the SHT2x library from SENIRION from https://www.sensirion.com/en/products/humidity-sensors/humidity-temperature-sensor-sht2x-digital-i2c-accurate/
|
||||
* The libraby can be download from: https://www.sensirion.com/en/products/all-documents-of-sensirions-humidity-sensors-for-download/
|
||||
* Go to SHT2x/ Sample Code SHT21 and download the zip file Sensirion_Humidity_Sensors_SHT21_Sample_Code_C-file
|
||||
*
|
||||
* \note the following files aren't fully used. Most parts are used in other .c of .h files or disabled.
|
||||
* DisplayDip204.C, DisplayDip204.h,
|
||||
* I2C_HAL.c, I2C_HAL.h,
|
||||
* System.c, System.h and
|
||||
* io70f3740.h.
|
||||
* \note for the use of two SHT2X you should use different IOs for SDA or additional hardware such as I2C multiplexer.
|
||||
* The adress of the SHT2x can’t be changed.
|
||||
*
|
||||
*
|
||||
* \ORIGINAL AUTHOR INFORMATION
|
||||
* ==============================================================================
|
||||
* S E N S I R I O N AG, Laubisruetistr. 50, CH-8712 Staefa, Switzerland
|
||||
* ==============================================================================
|
||||
* Project : SHT2x Sample Code (V1.2)
|
||||
* File : SHT2x.c
|
||||
* Author : MST
|
||||
* Controller: NEC V850/SG3 (uPD70F3740)
|
||||
* Compiler : IAR compiler for V850 (3.50A)
|
||||
* Brief : Sensor layer. Functions for sensor access
|
||||
* ==============================================================================
|
||||
*
|
||||
*
|
||||
* \verbatim
|
||||
#include <I2C_SHT2x.h>
|
||||
#include <i2c.h>
|
||||
#include <Typedefs.h>
|
||||
\endverbatim
|
||||
* \par
|
||||
*
|
||||
* \note An AVR-project can use multiple I2C's. One shoud take care that
|
||||
* in different source files there are no multiple I2C
|
||||
* definitions for the same I2C.
|
||||
*/
|
||||
|
||||
#ifndef SHT2x_H
|
||||
#define SHT2x_H
|
||||
|
||||
#include "i2c.h"
|
||||
#include "Typedefs.h"
|
||||
|
||||
// CRC
|
||||
#define POLYNOMIAL 0x131; //P(x)=x^8+x^5+x^4+1 = 100110001
|
||||
|
||||
#define TRIG_T_MEASUREMENT_HM 0xE3 // command trig. temp meas. hold master
|
||||
#define TRIG_RH_MEASUREMENT_HM 0xE5 // command trig. humidity meas. hold master
|
||||
#define TRIG_T_MEASUREMENT_POLL 0xF3 // command trig. temp meas. no hold master
|
||||
#define TRIG_RH_MEASUREMENT_POLL 0xF5 // command trig. humidity meas. no hold master
|
||||
#define USER_REG_W 0xE6 // command writing user register
|
||||
#define USER_REG_R 0xE7 // command reading user register
|
||||
#define SOFT_RESET 0xFE // command soft reset
|
||||
|
||||
#define SHT2x_RES_12_14BIT 0x00 // RH=12bit, T=14bit
|
||||
#define SHT2x_RES_8_12BIT 0x01 // RH= 8bit, T=12bit
|
||||
#define SHT2x_RES_10_13BIT 0x80 // RH=10bit, T=13bit
|
||||
#define SHT2x_RES_11_11BIT 0x81 // RH=11bit, T=11bit
|
||||
#define SHT2x_RES_MASK 0x81 // Mask for res. bits (7,0) in user reg.
|
||||
|
||||
#define SHT2x_EOB_ON 0x40 // end of battery
|
||||
#define SHT2x_EOB_MASK 0x40 // Mask for EOB bit(6) in user reg.
|
||||
|
||||
#define SHT2x_HEATER_ON 0x04 // heater on
|
||||
#define SHT2x_HEATER_OFF 0x00 // heater off
|
||||
#define SHT2x_HEATER_MASK 0x04 // Mask for Heater bit(2) in user reg.
|
||||
|
||||
#define LOW 0
|
||||
#define HIGH 1
|
||||
|
||||
#define TRUE 1
|
||||
#define FALSE 0
|
||||
|
||||
#define CONSTANT_6 6
|
||||
#define CONSTANT_125 125
|
||||
#define CONSTANT_46_85 46.85
|
||||
#define CONSTANT_175_72 175.72
|
||||
#define RESOLUTION_16 65536 //2^16
|
||||
|
||||
#define ACK_ERROR 0x01
|
||||
#define TIME_OUT_ERROR 0x02
|
||||
#define CHECKSUM_ERROR 0x04
|
||||
#define UNIT_ERROR 0x08
|
||||
|
||||
#define CMD_CHIP_MEMORY_LOC_1 0xFA
|
||||
#define ADR_CHIP_MEMORY_LOC_1 0x0F
|
||||
#define CMD_CHIP_MEMORY_LOC_2 0xFC
|
||||
#define ADR_CHIP_MEMORY_LOC_2 0xC9
|
||||
|
||||
// #define ACK 0 in i2c.h
|
||||
// #define NO_ACK 1 in i2c.h
|
||||
|
||||
typedef enum{
|
||||
HUMIDITY,
|
||||
TEMP
|
||||
}etSHT2xMeasureType;
|
||||
|
||||
#define I2C_SHT2x_ADR 0x40 // 0x80 -> 128 sensor I2C address + write bit 0x81 -> 129 sensor I2C address + read bit
|
||||
// Watch out for bit shifting with the I2C (TWI) protocol in i2c.c
|
||||
#define I2C_SHT2x_ADR_W 0x80
|
||||
#define I2C_SHT2x_ADR_R 0x81
|
||||
|
||||
uint8_t i2c_SHT2x_CheckCrc(uint8_t data[], uint8_t nbrOfBytes, uint8_t checksum);
|
||||
uint8_t i2c_SHT2x_ReadUserRegister(uint8_t *pRegisterValue);
|
||||
uint8_t i2c_SHT2x_WriteUserRegister(uint8_t *pRegisterValue);
|
||||
uint8_t i2c_SHT2x_MeasurePoll(etSHT2xMeasureType eSHT2xMeasureType, nt16 *pMeasurand);
|
||||
uint8_t i2c_SHT2x_MeasureHM(etSHT2xMeasureType eSHT2xMeasureType, nt16 *pMeasurand);
|
||||
uint8_t i2c_SHT2x_SoftReset();
|
||||
float i2c_SHT2x_CalcRH(uint16_t sRH);
|
||||
float i2c_SHT2x_CalcTemperatureC(uint16_t sT);
|
||||
uint8_t i2c_SHT2x_GetSerialNumber(uint8_t SerialNumber[]);
|
||||
#endif
|
||||
BIN
Sensirion_Humidity_Sensors_SHT21_Datasheet_V4.pdf
Normal file
BIN
Sensirion_Humidity_Sensors_SHT21_Datasheet_V4.pdf
Normal file
Binary file not shown.
BIN
Sensirion_Humidity_Sensors_SHT21_Sample_Code_V1.2.pdf
Normal file
BIN
Sensirion_Humidity_Sensors_SHT21_Sample_Code_V1.2.pdf
Normal file
Binary file not shown.
59
Typedefs.h
Normal file
59
Typedefs.h
Normal file
@ -0,0 +1,59 @@
|
||||
#ifndef TYPEDEFS_H
|
||||
#define TYPEDEFS_H
|
||||
//==============================================================================
|
||||
// S E N S I R I O N AG, Laubisruetistr. 50, CH-8712 Staefa, Switzerland
|
||||
//==============================================================================
|
||||
// Project : SHT2x Sample Code (V1.2)
|
||||
// File : typedefs.h
|
||||
// Author : MST
|
||||
// Controller: NEC V850/SG3 (uPD70F3740)
|
||||
// Compiler : IAR compiler for V850 (3.50A)
|
||||
// Brief : Definitions of typedefs for good readability and portability
|
||||
//==============================================================================
|
||||
//---------- Defines -----------------------------------------------------------
|
||||
//Processor endian system
|
||||
//#define BIG ENDIAN //e.g. Motorola (not tested at this time)
|
||||
#define LITTLE_ENDIAN //e.g. PIC, 8051, NEC V850
|
||||
//==============================================================================
|
||||
// basic types: making the size of types clear
|
||||
//==============================================================================
|
||||
typedef unsigned char u8t; ///< range: 0 .. 255
|
||||
typedef signed char i8t; ///< range: -128 .. +127
|
||||
typedef unsigned short u16t; ///< range: 0 .. 65535
|
||||
typedef signed short i16t; ///< range: -32768 .. +32767
|
||||
typedef unsigned long u32t; ///< range: 0 .. 4'294'967'295
|
||||
typedef signed long i32t; ///< range: -2'147'483'648 .. +2'147'483'647
|
||||
typedef float ft; ///< range: +-1.18E-38 .. +-3.39E+38
|
||||
typedef double dt; ///< range: .. +-1.79E+308
|
||||
|
||||
// #########################################################################
|
||||
// --- BOOLEAN DELETED, AND DEFINE AS TRUE = 1, FALSE = 0 in I2C_SHT2x.h---
|
||||
// #########################################################################
|
||||
|
||||
typedef union {
|
||||
u16t u16; // element specifier for accessing whole u16
|
||||
i16t i16; // element specifier for accessing whole i16
|
||||
struct {
|
||||
#ifdef LITTLE_ENDIAN // Byte-order is little endian
|
||||
u8t u8L; // element specifier for accessing low u8
|
||||
u8t u8H; // element specifier for accessing high u8
|
||||
#else // Byte-order is big endian
|
||||
u8t u8H; // element specifier for accessing low u8
|
||||
u8t u8L; // element specifier for accessing high u8
|
||||
#endif
|
||||
} s16; // element spec. for acc. struct with low or high u8
|
||||
} nt16;
|
||||
typedef union {
|
||||
u32t u32; // element specifier for accessing whole u32
|
||||
i32t i32; // element specifier for accessing whole i32
|
||||
struct {
|
||||
#ifdef LITTLE_ENDIAN // Byte-order is little endian
|
||||
u16t u16L; // element specifier for accessing low u16
|
||||
u16t u16H; // element specifier for accessing high u16
|
||||
#else // Byte-order is big endian
|
||||
u16t u16H; // element specifier for accessing low u16
|
||||
u16t u16L; // element specifier for accessing high u16
|
||||
#endif
|
||||
} s32; // element spec. for acc. struct with low or high u16
|
||||
} nt32;
|
||||
#endif
|
||||
94
i2c.c
Normal file
94
i2c.c
Normal file
@ -0,0 +1,94 @@
|
||||
/*!
|
||||
* \file i2c.c
|
||||
* \author Wim Dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
|
||||
* \date 11-12-2015
|
||||
* \version 1.0
|
||||
*
|
||||
* \brief Simple I2C function for ATxmega256a3u
|
||||
*
|
||||
* \details The files i2c.c and i2c.h are from w.e.dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
|
||||
* For i2c.c code 21.8 is used from: "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
* For i2c.h code 21.9 is used from: "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
*
|
||||
* \verbatim
|
||||
#include <i2c.h>
|
||||
\endverbatim
|
||||
* \par
|
||||
*
|
||||
* \note An AVR-project can use multiple I2C's. One shoud take care that
|
||||
* in different source files there are no multiple i2c_init
|
||||
* definitions for the same I2C.
|
||||
*/
|
||||
|
||||
#include "i2c.h"
|
||||
|
||||
void i2c_init(TWI_t *twi, uint8_t baudRateRegisterSetting)
|
||||
{
|
||||
twi->MASTER.BAUD = baudRateRegisterSetting;
|
||||
twi->MASTER.CTRLC = 0;
|
||||
twi->MASTER.CTRLA = TWI_MASTER_ENABLE_bm;
|
||||
twi->MASTER.STATUS = TWI_MASTER_BUSSTATE_IDLE_gc;
|
||||
}
|
||||
|
||||
uint8_t i2c_start(TWI_t *twi, uint8_t address, uint8_t rw)
|
||||
{
|
||||
if ( (twi->MASTER.STATUS & TWI_MASTER_BUSSTATE_gm) != // if bus available
|
||||
TWI_MASTER_BUSSTATE_IDLE_gc ) return I2C_STATUS_BUSY; //
|
||||
twi->MASTER.ADDR = (address << 1) | rw; // send slave address
|
||||
while( ! (twi->MASTER.STATUS & (TWI_MASTER_WIF_bm << rw)) ); // wait until sent
|
||||
|
||||
if ( twi->MASTER.STATUS & TWI_MASTER_RXACK_bm ) { // if no ack
|
||||
twi->MASTER.CTRLC = TWI_MASTER_CMD_STOP_gc;
|
||||
return I2C_STATUS_NO_ACK;
|
||||
}
|
||||
|
||||
return I2C_STATUS_OK;
|
||||
}
|
||||
|
||||
uint8_t i2c_restart(TWI_t *twi, uint8_t address, uint8_t rw)
|
||||
{
|
||||
twi->MASTER.ADDR = (address << 1) | rw; // send slave address
|
||||
while( ! (twi->MASTER.STATUS & (TWI_MASTER_WIF_bm << rw)) ); // wait until sent
|
||||
|
||||
if ( twi->MASTER.STATUS & TWI_MASTER_RXACK_bm ) { // if no ack
|
||||
twi->MASTER.CTRLC = TWI_MASTER_CMD_STOP_gc;
|
||||
return I2C_STATUS_NO_ACK;
|
||||
}
|
||||
|
||||
return I2C_STATUS_OK;
|
||||
}
|
||||
|
||||
void i2c_stop(TWI_t *twi)
|
||||
{
|
||||
twi->MASTER.CTRLC = TWI_MASTER_CMD_STOP_gc;
|
||||
twi->MASTER.STATUS = TWI_MASTER_BUSSTATE_IDLE_gc;
|
||||
}
|
||||
|
||||
uint8_t i2c_write(TWI_t *twi, uint8_t data)
|
||||
{
|
||||
twi->MASTER.DATA = data; // send data
|
||||
while( ! (twi->MASTER.STATUS & TWI_MASTER_WIF_bm) ); // wait until sent
|
||||
|
||||
if ( twi->MASTER.STATUS & TWI_MASTER_RXACK_bm ) { // if no ack
|
||||
twi->MASTER.CTRLC = TWI_MASTER_CMD_STOP_gc;
|
||||
return I2C_STATUS_NO_ACK;
|
||||
}
|
||||
|
||||
return I2C_STATUS_OK;
|
||||
}
|
||||
|
||||
uint8_t i2c_read(TWI_t *twi, uint8_t ack)
|
||||
{
|
||||
uint8_t data;
|
||||
|
||||
while( ! (twi->MASTER.STATUS & TWI_MASTER_RIF_bm) ); // wait until received
|
||||
data = twi->MASTER.DATA; // read data
|
||||
twi->MASTER.CTRLC = ((ack==I2C_ACK) ? TWI_MASTER_CMD_RECVTRANS_gc : // send ack (go on) or
|
||||
TWI_MASTER_ACKACT_bm|TWI_MASTER_CMD_STOP_gc); // nack (and stop)
|
||||
|
||||
if ( ack == I2C_NACK ) {
|
||||
while( ! (twi->MASTER.STATUS & TWI_MASTER_BUSSTATE_IDLE_gc) );
|
||||
}
|
||||
|
||||
return data;
|
||||
}
|
||||
41
i2c.h
Normal file
41
i2c.h
Normal file
@ -0,0 +1,41 @@
|
||||
/*!
|
||||
* \file i2c.c
|
||||
* \author Wim Dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
|
||||
* \date 11-12-2015
|
||||
* \version 1.0
|
||||
*
|
||||
* \brief Simple I2C function for ATxmega256a3u
|
||||
*
|
||||
* \details The files i2c.c and i2c.h are from w.e.dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
|
||||
* For i2c.c code 21.8 is used from: "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
* For i2c.h code 21.9 is used from: "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
*
|
||||
* \verbatim
|
||||
#include <i2c.h>
|
||||
\endverbatim
|
||||
* \par
|
||||
*
|
||||
* \note An AVR-project can use multiple I2C's. One shoud take care that
|
||||
* in different source files there are no multiple i2c_init
|
||||
* definitions for the same I2C.
|
||||
*/
|
||||
|
||||
#include <avr/io.h>
|
||||
|
||||
#define TWI_BAUD(F_SYS, F_TWI) ((F_SYS / (2 * F_TWI)) - 5)
|
||||
|
||||
#define I2C_ACK 0
|
||||
#define I2C_NACK 1
|
||||
#define I2C_READ 1
|
||||
#define I2C_WRITE 0
|
||||
|
||||
#define I2C_STATUS_OK 0
|
||||
#define I2C_STATUS_BUSY 1
|
||||
#define I2C_STATUS_NO_ACK 2
|
||||
|
||||
void i2c_init(TWI_t *twi, uint8_t baudRateRegisterSetting);
|
||||
uint8_t i2c_start(TWI_t *twi, uint8_t address, uint8_t rw);
|
||||
uint8_t i2c_restart(TWI_t *twi, uint8_t address, uint8_t rw);
|
||||
void i2c_stop(TWI_t *twi);
|
||||
uint8_t i2c_write(TWI_t *twi, uint8_t data);
|
||||
uint8_t i2c_read(TWI_t *twi, uint8_t ack);
|
||||
191
i2c_lcd.c
Normal file
191
i2c_lcd.c
Normal file
@ -0,0 +1,191 @@
|
||||
/*!
|
||||
* \file i2c_lcd.c
|
||||
* \author Patrick Taling (not the original author)
|
||||
* \date 20/02/2017
|
||||
* \version 1.0
|
||||
*
|
||||
* \brief Simple I2C LCD library to write text to a I2C lcd (PCF8574T adress 0x27) with the ATxmega256a3u.
|
||||
*
|
||||
* \details The file i2c_lcd.c is the library for a I2C lcd (PCF8574T adress 0x27)
|
||||
|
||||
* The library needs some parts of the i2c_lcd library from Noel200 from http://www.elektroda.pl/rtvforum/topic2756081.html.
|
||||
* The library can be downloaded from: http://www.elektroda.pl/rtvforum/login.php?redirect=download.php&id=670533.
|
||||
* Go to LCD_PCF8574T/lcd_pcf/ and use i2c_lcd.c and i2c_lcd.h from the pakkage
|
||||
*
|
||||
* The library needs the i2c library from w.e.dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
|
||||
* For i2c.c use code 21.8 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
* For i2c.h use code 21.9 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
*
|
||||
*
|
||||
* ## Original author information ##
|
||||
|
||||
Obs³uga wyœwietlacza HD44780 po I2C za pomoc¹ PCF8574T.
|
||||
2015-01-DASEJ , dasej(at)wp.pl
|
||||
|
||||
AVR Studio 4.18, programator AVR PROG MKII,
|
||||
Procesor Atmega328P 16 MHz, +5V.
|
||||
|
||||
|
||||
* ####
|
||||
*
|
||||
*
|
||||
* \verbatim
|
||||
#include <i2c_lcd.h>
|
||||
\endverbatim
|
||||
* \par
|
||||
*
|
||||
* \note An AVR-project can use multiple I2C's. One shoud take care that
|
||||
* in different source files there are no multiple I2C
|
||||
* definitions for the same I2C.
|
||||
*/
|
||||
|
||||
#define F_CPU 2000000UL
|
||||
|
||||
#include "i2c_lcd.h"
|
||||
#include <util/delay.h>
|
||||
|
||||
char i2c_lcd_status = 0X00;
|
||||
volatile uint8_t lcd_line = 0;
|
||||
|
||||
void i2c_lcd_write_status(void)
|
||||
{
|
||||
i2c_start(&TWIE, i2c_lcd_ADDR, 0);
|
||||
i2c_write(&TWIE, i2c_lcd_status);
|
||||
i2c_stop(&TWIE);
|
||||
}
|
||||
|
||||
void i2c_lcd_data_part(char data_part)
|
||||
{
|
||||
i2c_lcd_status &= ~i2c_lcd_DB4 & ~i2c_lcd_DB5 & ~i2c_lcd_DB6 & ~i2c_lcd_DB7;
|
||||
if(data_part & 0x01) i2c_lcd_status |= i2c_lcd_DB4;
|
||||
if(data_part & 0x02) i2c_lcd_status |= i2c_lcd_DB5;
|
||||
if(data_part & 0x04) i2c_lcd_status |= i2c_lcd_DB6;
|
||||
if(data_part & 0x08) i2c_lcd_status |= i2c_lcd_DB7;
|
||||
}
|
||||
|
||||
void i2c_lcd_write(char data)
|
||||
{
|
||||
i2c_lcd_e_hi();
|
||||
i2c_lcd_data_part(data >> 4);
|
||||
i2c_lcd_write_status();
|
||||
i2c_lcd_e_lo();
|
||||
i2c_lcd_write_status();
|
||||
i2c_lcd_e_hi();
|
||||
i2c_lcd_data_part(data);
|
||||
i2c_lcd_write_status();
|
||||
i2c_lcd_e_lo();
|
||||
i2c_lcd_write_status();
|
||||
_delay_ms(2);
|
||||
}
|
||||
|
||||
void i2c_lcd_write_instruction(char instruction)
|
||||
{
|
||||
i2c_lcd_rw_lo();
|
||||
i2c_lcd_rs_lo();
|
||||
i2c_lcd_write(instruction);
|
||||
}
|
||||
|
||||
void i2c_lcd_write_data(char data)
|
||||
{
|
||||
i2c_lcd_rs_hi();
|
||||
|
||||
switch (data) {
|
||||
case '\f':
|
||||
i2c_lcd_clear();
|
||||
lcd_line = 0;
|
||||
break;
|
||||
case '\n':
|
||||
if (++lcd_line==LCD_LINES) lcd_line = 0;
|
||||
i2c_lcd_set_cursor(0, lcd_line);
|
||||
break;
|
||||
default:
|
||||
i2c_lcd_write(data);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void i2c_lcd_write_text(char *text)
|
||||
{
|
||||
while(*text) i2c_lcd_write_data(*text++);
|
||||
}
|
||||
|
||||
void i2c_lcd_clear(void)
|
||||
{
|
||||
lcd_line = 0;
|
||||
i2c_lcd_write_instruction(0x01);
|
||||
}
|
||||
|
||||
void i2c_lcd_set_cursor(char x, char y)
|
||||
{
|
||||
uint8_t address;
|
||||
|
||||
#if LCD_LINES==1
|
||||
address = LCD_START_LINE1;
|
||||
#elif LCD_LINES==2
|
||||
if ( y==0 ) {
|
||||
address = LCD_START_LINE1;
|
||||
} else {
|
||||
address = LCD_START_LINE2;
|
||||
}
|
||||
#else
|
||||
if ( y==0 ) {
|
||||
address = LCD_START_LINE1;
|
||||
} else if ( y==1) {
|
||||
address = LCD_START_LINE2;
|
||||
} else if ( y==2) {
|
||||
address = LCD_START_LINE3;
|
||||
} else {
|
||||
address = LCD_START_LINE4;
|
||||
}
|
||||
#endif
|
||||
|
||||
i2c_lcd_write_instruction(HD44780_DDRAM_SET | (x + (address * y)));
|
||||
}
|
||||
|
||||
void i2c_lcd_led_on(void)
|
||||
{
|
||||
i2c_lcd_led_hi();
|
||||
i2c_lcd_write_status();
|
||||
}
|
||||
|
||||
void i2c_lcd_led_off(void)
|
||||
{
|
||||
i2c_lcd_led_lo();
|
||||
i2c_lcd_write_status();
|
||||
}
|
||||
|
||||
void i2c_lcd_home(void)
|
||||
{
|
||||
lcd_line = 0;
|
||||
i2c_lcd_set_cursor(0,0);
|
||||
}
|
||||
|
||||
void i2c_lcd_init(void)
|
||||
{
|
||||
char i;
|
||||
_delay_ms(15);
|
||||
for(i = 0; i < 3; i++)
|
||||
{
|
||||
i2c_lcd_data_part(0x03);
|
||||
i2c_lcd_e_hi();
|
||||
i2c_lcd_write_status();
|
||||
|
||||
i2c_lcd_e_lo();
|
||||
i2c_lcd_write_status();
|
||||
_delay_ms(4);
|
||||
}
|
||||
i2c_lcd_data_part(0x02);
|
||||
i2c_lcd_e_hi();
|
||||
i2c_lcd_write_status();
|
||||
|
||||
i2c_lcd_e_lo();
|
||||
i2c_lcd_write_status();
|
||||
_delay_ms(1);
|
||||
|
||||
i2c_lcd_write_instruction(HD44780_FUNCTION_SET | HD44780_FONT5x10 | HD44780_TWO_LINE | HD44780_4_BIT); // interfejs 4-bity, 2-linie, znak 5x7
|
||||
i2c_lcd_write_instruction(HD44780_DISPLAY_ONOFF | HD44780_DISPLAY_OFF); // wy³¹czenie wyswietlacza
|
||||
i2c_lcd_write_instruction(HD44780_CLEAR); // czyszczenie zawartosæi pamieci DDRAM
|
||||
_delay_ms(2);
|
||||
i2c_lcd_write_instruction(HD44780_ENTRY_MODE | HD44780_EM_SHIFT_CURSOR | HD44780_EM_INCREMENT);// inkrementaja adresu i przesuwanie kursora
|
||||
i2c_lcd_write_instruction(HD44780_DISPLAY_ONOFF | HD44780_DISPLAY_ON | HD44780_CURSOR_OFF | HD44780_CURSOR_NOBLINK); // w³¹cz LCD, bez kursora i mrugania
|
||||
}
|
||||
133
i2c_lcd.h
Normal file
133
i2c_lcd.h
Normal file
@ -0,0 +1,133 @@
|
||||
/*!
|
||||
* \file i2c_lcd.h
|
||||
* \author Patrick Taling (not the original author)
|
||||
* \date 20/02/2017
|
||||
* \version 1.0
|
||||
*
|
||||
* \brief Simple I2C LCD library to write text to a I2C lcd (PCF8574T adress 0x27) with the ATxmega256a3u.
|
||||
*
|
||||
* \details The file i2c_lcd.h is the library for a I2C lcd (PCF8574T adress 0x27)
|
||||
* The library needs some parts of the i2c_lcd library from Noel200 from http://www.elektroda.pl/rtvforum/topic2756081.html.
|
||||
* The library can be downloaded from: http://www.elektroda.pl/rtvforum/login.php?redirect=download.php&id=670533.
|
||||
* Go to LCD_PCF8574T/lcd_pcf/ and use i2c_lcd.c and i2c_lcd.h from the pakkage
|
||||
*
|
||||
* The library needs the i2c library from w.e.dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
|
||||
* For i2c.c use code 21.8 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
* For i2c.h use code 21.9 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
*
|
||||
*
|
||||
* ## Original author information ##
|
||||
|
||||
Obs³uga wyœwietlacza HD44780 po I2C za pomoc¹ PCF8574T.
|
||||
2015-01-DASEJ , dasej(at)wp.pl
|
||||
|
||||
AVR Studio 4.18, programator AVR PROG MKII,
|
||||
Procesor Atmega328P 16 MHz, +5V.
|
||||
|
||||
|
||||
* ####
|
||||
*
|
||||
*
|
||||
* \verbatim
|
||||
#include <i2c.h>
|
||||
\endverbatim
|
||||
* \par
|
||||
*
|
||||
* \note An AVR-project can use multiple I2C's. One shoud take care that
|
||||
* in different source files there are no multiple I2C
|
||||
* definitions for the same I2C.
|
||||
*/
|
||||
|
||||
#include <util/delay.h>
|
||||
|
||||
#include "i2c.h"
|
||||
|
||||
#define LCD_LINES 2 //!< Number of visible lines of the display
|
||||
#define LCD_DISP_LENGTH 16 //!< Visible characters per line of the display
|
||||
|
||||
#if LCD_DISP_LENGTH==16
|
||||
#define LCD_START_LINE1 0x00 //!< DDRAM address of first char of line 1
|
||||
#define LCD_START_LINE2 0x40 //!< DDRAM address of first char of line 2
|
||||
#define LCD_START_LINE3 0x10 //!< DDRAM address of first char of line 3
|
||||
#define LCD_START_LINE4 0x50 //!< DDRAM address of first char of line 4
|
||||
#else
|
||||
#define LCD_START_LINE1 0x00 //!< DDRAM address of first char of line 1
|
||||
#define LCD_START_LINE2 0x40 //!< DDRAM address of first char of line 2
|
||||
#define LCD_START_LINE3 0x14 //!< DDRAM address of first char of line 3
|
||||
#define LCD_START_LINE4 0x54 //!< DDRAM address of first char of line 4
|
||||
#endif
|
||||
|
||||
#define i2c_lcd_RS (1 << 0)
|
||||
#define i2c_lcd_RW (1 << 1)
|
||||
#define i2c_lcd_E (1 << 2)
|
||||
#define i2c_lcd_LED (1 << 3)
|
||||
#define i2c_lcd_DB4 (1 << 4)
|
||||
#define i2c_lcd_DB5 (1 << 5)
|
||||
#define i2c_lcd_DB6 (1 << 6)
|
||||
#define i2c_lcd_DB7 (1 << 7)
|
||||
|
||||
|
||||
|
||||
#define i2c_lcd_rs_lo() i2c_lcd_status &= ~i2c_lcd_RS
|
||||
#define i2c_lcd_rs_hi() i2c_lcd_status |= i2c_lcd_RS
|
||||
|
||||
#define i2c_lcd_rw_lo() i2c_lcd_status &= ~i2c_lcd_RW
|
||||
#define i2c_lcd_rw_hi() i2c_lcd_status |= i2c_lcd_RW
|
||||
|
||||
|
||||
#define i2c_lcd_e_lo() i2c_lcd_status &= ~i2c_lcd_E
|
||||
#define i2c_lcd_e_hi() i2c_lcd_status |= i2c_lcd_E
|
||||
|
||||
#define i2c_lcd_led_lo() i2c_lcd_status &= ~i2c_lcd_LED
|
||||
#define i2c_lcd_led_hi() i2c_lcd_status |= i2c_lcd_LED
|
||||
|
||||
|
||||
#define HD44780_ENTRY_MODE 0x04
|
||||
#define HD44780_EM_SHIFT_CURSOR 0
|
||||
#define HD44780_EM_SHIFT_DISPLAY 1
|
||||
#define HD44780_EM_DECREMENT 0
|
||||
#define HD44780_EM_INCREMENT 2
|
||||
|
||||
#define HD44780_DISPLAY_ONOFF 0x08
|
||||
#define HD44780_DISPLAY_OFF 0
|
||||
#define HD44780_DISPLAY_ON 4
|
||||
#define HD44780_CURSOR_OFF 0
|
||||
#define HD44780_CURSOR_ON 2
|
||||
#define HD44780_CURSOR_NOBLINK 0
|
||||
#define HD44780_CURSOR_BLINK 1
|
||||
|
||||
#define HD44780_DISPLAY_CURSOR_SHIFT 0x10
|
||||
#define HD44780_SHIFT_CURSOR 0
|
||||
#define HD44780_SHIFT_DISPLAY 8
|
||||
#define HD44780_SHIFT_LEFT 0
|
||||
#define HD44780_SHIFT_RIGHT 4
|
||||
|
||||
#define HD44780_FUNCTION_SET 0x20
|
||||
#define HD44780_FONT5x7 0
|
||||
#define HD44780_FONT5x10 4
|
||||
#define HD44780_ONE_LINE 0
|
||||
#define HD44780_TWO_LINE 8
|
||||
#define HD44780_4_BIT 0
|
||||
#define HD44780_8_BIT 16
|
||||
|
||||
#define HD44780_CGRAM_SET 0x40
|
||||
|
||||
#define HD44780_DDRAM_SET 0x80
|
||||
|
||||
#define HD44780_CLEAR 0x01
|
||||
|
||||
#define i2c_lcd_ADDR 0x27 //I2C LCD adres.
|
||||
|
||||
char i2c_lcd_status;
|
||||
|
||||
void i2c_lcd_write_status(void);
|
||||
void i2c_lcd_data_part(char data_part);
|
||||
void i2c_lcd_write(char data);
|
||||
void i2c_lcd_write_instruction(char instruction);
|
||||
void i2c_lcd_write_data(char data);
|
||||
void i2c_lcd_write_text(char *text);
|
||||
void i2c_lcd_clear(void);
|
||||
void i2c_lcd_set_cursor(char x, char y);
|
||||
void i2c_lcd_led_on(void);
|
||||
void i2c_lcd_led_off(void);
|
||||
void i2c_lcd_init(void);
|
||||
191
main.c
Normal file
191
main.c
Normal file
@ -0,0 +1,191 @@
|
||||
/*!
|
||||
* \file main.c
|
||||
* \author Patrick Taling
|
||||
* \date 31/03/2017
|
||||
* \version 1.0
|
||||
*
|
||||
* \brief
|
||||
* Simple I2C SHT2x library to measure relative humidity and temperature and write it to an I2C LCD with the ATxmega256a3u.
|
||||
* Rights are owned by the original authors (Atmel, w.e.dolman, Noel200 (Elektroda) and Sensirion)
|
||||
*
|
||||
* \Hardware
|
||||
* # 1602 I2c HD44780 LCD from HobbyElectronica https://www.hobbyelectronica.nl/product/1602-lcd-i2c-blauw-backlight/
|
||||
* # HvA Xmega-bord (ATxmega256a3u with programmer/ USB-RS232-interface ATxmega32a4u)
|
||||
* # 3.3V - 5V levelshifter with two BS170 N-channel MOSFET
|
||||
* # Humidity/ temperature sensor module (EBM016) https://www.elektor.nl/humidity-sensor-module-ebm016
|
||||
*
|
||||
* \development
|
||||
* # Atmel Studio 7 (version: 7.0.118)
|
||||
* # OS Version: Microsoft Windows NT 6.2.9200.0 (Platform: Win32NT)
|
||||
* # Atmel Gallary (7.8)
|
||||
*
|
||||
* \details
|
||||
* #The file main.c is the main to write text to a I2C lcd (PCF8574T adress 0x27) with the ATxmega256a3u.
|
||||
* #For the use of the main code you need the i2c library from w.e.dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
|
||||
* #For i2c.c use code 21.8 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
* #For i2c.h use code 21.9 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
|
||||
*
|
||||
* #The main code needs some parts of the i2c_lcd library from Noel200 from http://www.elektroda.pl/rtvforum/topic2756081.html.
|
||||
* #The library can be downloaded from: http://www.elektroda.pl/rtvforum/login.php?redirect=download.php&id=670533.
|
||||
* #Go to LCD_PCF8574T/lcd_pcf/ and use i2c_lcd.c and i2c_lcd.h from the pakkage
|
||||
*
|
||||
* #The libraby needs some parts of the the SHT2x library from SENIRION from https://www.sensirion.com/en/products/humidity-sensors/humidity-temperature-sensor-sht2x-digital-i2c-accurate/
|
||||
* #The libraby can be download from: https://www.sensirion.com/en/products/all-documents-of-sensirions-humidity-sensors-for-download/
|
||||
* # Go to SHT2x/ Sample Code SHT21 and download the zip file Sensirion_Humidity_Sensors_SHT21_Sample_Code_C-file
|
||||
* \note the following files aren't fully used. Most parts are used in other .c of .h files or disabled.
|
||||
* DisplayDip204.C, DisplayDip204.h,
|
||||
* I2C_HAL.c, I2C_HAL.h,
|
||||
* System.c, System.h and
|
||||
* io70f3740.h.
|
||||
* \note for the use of two SHT2X you should use different IOs for SDA or additional hardware such as I2C multiplexer.
|
||||
* The adress of the SHT2x can’t be changed.
|
||||
*
|
||||
* \verbatim
|
||||
* #include <i2c_lcd.h>
|
||||
* #include <I2C_SHT2x.h>
|
||||
* #include <Typedefs.h>
|
||||
\endverbatim
|
||||
* \par
|
||||
*
|
||||
* \note An AVR-project can use multiple I2C's. One shoud take care that
|
||||
* in different source files there are no multiple i2c_init
|
||||
* definitions for the same I2C.
|
||||
*/
|
||||
|
||||
#define F_CPU 2000000UL
|
||||
#include <avr/io.h>
|
||||
#include <avr/interrupt.h>
|
||||
#include <util/delay.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
#define BAUD_100K 100000UL
|
||||
#include "I2C_SHT2x.h"
|
||||
#include "Typedefs.h"
|
||||
#include "i2c_lcd.h"
|
||||
|
||||
//==============================================================================
|
||||
int main()
|
||||
//==============================================================================
|
||||
{ // variables
|
||||
uint8_t error = 0;
|
||||
uint8_t userRegister;
|
||||
int endOfBattery;
|
||||
nt16 sRH;
|
||||
float humidityRH = 0;
|
||||
nt16 sT;
|
||||
float temperatureC = 0;
|
||||
uint8_t SerialNumber_SHT2x[8];
|
||||
|
||||
char buffer[20];
|
||||
uint16_t h;
|
||||
|
||||
i2c_init(&TWIE, TWI_BAUD(F_CPU, BAUD_100K));
|
||||
PORTE.DIRSET = PIN1_bm|PIN0_bm; //SDA 0 SCL 1
|
||||
|
||||
i2c_lcd_init();
|
||||
i2c_lcd_led_on();
|
||||
i2c_lcd_set_cursor(0,0);
|
||||
|
||||
_delay_ms(15); //initialization powerUp SHT2x (15ms)
|
||||
|
||||
i2c_lcd_clear();
|
||||
_delay_us(1500); //initialization powerUp LCD (1.5ms)
|
||||
|
||||
i2c_lcd_set_cursor(0,0);
|
||||
i2c_lcd_write_text("T :");
|
||||
i2c_lcd_write_text("--.-- C");
|
||||
|
||||
i2c_lcd_set_cursor(0,1);
|
||||
i2c_lcd_write_text("RH:");
|
||||
i2c_lcd_write_text("--.-- %");
|
||||
|
||||
while(1)
|
||||
{
|
||||
error = 0; // reset error status
|
||||
|
||||
//=====================================================
|
||||
// --- Reset sensor by command ---
|
||||
//=====================================================
|
||||
error |= i2c_SHT2x_SoftReset();
|
||||
|
||||
//=====================================================
|
||||
// --- Read the sensors serial number (64bit) ---
|
||||
//=====================================================
|
||||
error |= i2c_SHT2x_GetSerialNumber(SerialNumber_SHT2x);
|
||||
|
||||
//=====================================================
|
||||
// --- Set Resolution e.g. RH 10bit, Temp 13bit ---
|
||||
//=====================================================
|
||||
error |= i2c_SHT2x_ReadUserRegister(&userRegister);
|
||||
userRegister = (userRegister & ~SHT2x_RES_MASK) | SHT2x_RES_10_13BIT;
|
||||
error |= i2c_SHT2x_WriteUserRegister(&userRegister);
|
||||
|
||||
//=====================================================
|
||||
// --- measure humidity with "Hold Master Mode (HM)" ---
|
||||
//=====================================================
|
||||
error |= i2c_SHT2x_MeasureHM(TEMP, &sT);
|
||||
error |= i2c_SHT2x_MeasureHM(HUMIDITY, &sRH);
|
||||
|
||||
//=====================================================
|
||||
// --- measure temperature with "Polling Mode" (no hold master) ---
|
||||
// --- Disabled due to error in TEMP ----
|
||||
//=====================================================
|
||||
//error |= i2c_SHT2x_MeasurePoll(HUMIDITY, &sRH); //works fine
|
||||
//error |= i2c_SHT2x_MeasurePoll(TEMP, &sT); // Has an error in reading measuring
|
||||
|
||||
//=====================================================
|
||||
//-- calculate humidity and temperature --
|
||||
//=====================================================
|
||||
temperatureC = i2c_SHT2x_CalcTemperatureC(sT.u16);
|
||||
humidityRH = i2c_SHT2x_CalcRH(sRH.u16);
|
||||
|
||||
//=====================================================
|
||||
// --- check end of battery status (eob)---
|
||||
//=====================================================
|
||||
error |= i2c_SHT2x_ReadUserRegister(&userRegister); //get actual user reg
|
||||
if( (userRegister & SHT2x_EOB_MASK) == SHT2x_EOB_ON ) endOfBattery = TRUE;
|
||||
else endOfBattery = FALSE;
|
||||
|
||||
//=====================================================
|
||||
//-- write humidity, temperature or error values on LCD --
|
||||
//=====================================================
|
||||
if(error != 0){
|
||||
i2c_lcd_clear();
|
||||
_delay_us(1500);
|
||||
i2c_lcd_write_text("An ERROR");
|
||||
i2c_lcd_set_cursor(0,1);
|
||||
i2c_lcd_write_text("has occurred");
|
||||
}
|
||||
else if (endOfBattery){
|
||||
i2c_lcd_clear();
|
||||
_delay_us(1500);
|
||||
i2c_lcd_write_text("LOW BATTERY");
|
||||
}
|
||||
else{
|
||||
i2c_lcd_clear();
|
||||
_delay_us(1500);
|
||||
i2c_lcd_set_cursor(0,0);
|
||||
h= temperatureC;
|
||||
i2c_lcd_write_text("T :");
|
||||
utoa(temperatureC, buffer, 10);
|
||||
i2c_lcd_write_text(buffer);
|
||||
i2c_lcd_write_text(".");
|
||||
utoa((temperatureC-h)*100, buffer, 10);
|
||||
i2c_lcd_write_text(buffer);
|
||||
i2c_lcd_write_text(" C");
|
||||
|
||||
i2c_lcd_set_cursor(0,1);
|
||||
h= humidityRH;
|
||||
i2c_lcd_write_text("RH:");
|
||||
utoa(humidityRH, buffer, 10);
|
||||
i2c_lcd_write_text(buffer);
|
||||
i2c_lcd_write_text(".");
|
||||
utoa((humidityRH-h)*100, buffer, 10);
|
||||
i2c_lcd_write_text(buffer);
|
||||
i2c_lcd_write_text(" %");
|
||||
}
|
||||
|
||||
_delay_ms(300); // wait 3s for next measurement
|
||||
}
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user