mirror of https://github.com/arendst/Tasmota.git
288 lines
7.7 KiB
C++
288 lines
7.7 KiB
C++
/*
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xsns_08_htu21.ino - HTU21 temperature and humidity sensor support for Tasmota
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Copyright (C) 2021 Heiko Krupp and Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_I2C
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#ifdef USE_HTU
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/*********************************************************************************************\
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* HTU21 - Temperature and Humidity
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*
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* Source: Heiko Krupp
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*
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* I2C Address: 0x40
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\*********************************************************************************************/
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#define XSNS_08 8
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#define XI2C_09 9 // See I2CDEVICES.md
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#define HTU21_ADDR 0x40
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#define SI7013_CHIPID 0x0D
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#define SI7020_CHIPID 0x14
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#define SI7021_CHIPID 0x15
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#define HTU21_CHIPID 0x32
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#define HTU21_READTEMP 0xE3
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#define HTU21_READHUM 0xE5
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#define HTU21_WRITEREG 0xE6
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#define HTU21_READREG 0xE7
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#define HTU21_RESET 0xFE
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#define HTU21_HEATER_WRITE 0x51
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#define HTU21_HEATER_READ 0x11
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#define HTU21_SERIAL2_READ1 0xFC /* Read 3rd two Serial bytes */
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#define HTU21_SERIAL2_READ2 0xC9 /* Read 4th two Serial bytes */
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#define HTU21_HEATER_ON 0x04
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#define HTU21_HEATER_OFF 0xFB
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#define HTU21_RES_RH12_T14 0x00 // Default
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#define HTU21_RES_RH8_T12 0x01
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#define HTU21_RES_RH10_T13 0x80
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#define HTU21_RES_RH11_T11 0x81
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#define HTU21_CRC8_POLYNOM 0x13100
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const char kHtuTypes[] PROGMEM = "HTU21|SI7013|SI7020|SI7021|T/RH?";
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struct {
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float temperature = 0;
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float humidity = 0;
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uint8_t address;
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uint8_t type = 0;
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uint8_t delay_temp;
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uint8_t delay_humidity = 50;
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uint8_t valid = 0;
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char types[7];
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} Htu;
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/*********************************************************************************************/
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uint8_t HtuCheckCrc8(uint16_t data)
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{
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for (uint32_t bit = 0; bit < 16; bit++) {
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if (data & 0x8000) {
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data = (data << 1) ^ HTU21_CRC8_POLYNOM;
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} else {
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data <<= 1;
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}
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}
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return data >>= 8;
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}
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uint8_t HtuReadDeviceId(void)
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{
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HtuReset(); // Fixes ESP32 sensor loss at restart
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uint16_t deviceID = 0;
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uint8_t checksum = 0;
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Wire.beginTransmission(HTU21_ADDR);
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Wire.write(HTU21_SERIAL2_READ1);
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Wire.write(HTU21_SERIAL2_READ2);
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Wire.endTransmission();
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Wire.requestFrom(HTU21_ADDR, 3);
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deviceID = Wire.read() << 8;
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deviceID |= Wire.read();
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checksum = Wire.read();
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if (HtuCheckCrc8(deviceID) == checksum) {
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deviceID = deviceID >> 8;
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} else {
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deviceID = 0;
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}
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return (uint8_t)deviceID;
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}
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void HtuSetResolution(uint8_t resolution)
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{
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uint8_t current = I2cRead8(HTU21_ADDR, HTU21_READREG);
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current &= 0x7E; // Replace current resolution bits with 0
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current |= resolution; // Add new resolution bits to register
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I2cWrite8(HTU21_ADDR, HTU21_WRITEREG, current);
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}
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void HtuReset(void)
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{
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Wire.beginTransmission(HTU21_ADDR);
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Wire.write(HTU21_RESET);
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Wire.endTransmission();
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delay(15); // Reset takes 15ms
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}
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void HtuHeater(uint8_t heater)
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{
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uint8_t current = I2cRead8(HTU21_ADDR, HTU21_READREG);
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switch(heater)
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{
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case HTU21_HEATER_ON : current |= heater;
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break;
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case HTU21_HEATER_OFF : current &= heater;
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break;
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default : current &= heater;
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break;
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}
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I2cWrite8(HTU21_ADDR, HTU21_WRITEREG, current);
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}
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void HtuInit(void)
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{
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HtuReset();
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HtuHeater(HTU21_HEATER_OFF);
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HtuSetResolution(HTU21_RES_RH12_T14);
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}
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bool HtuRead(void)
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{
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uint8_t checksum = 0;
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uint16_t sensorval = 0;
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if (Htu.valid) { Htu.valid--; }
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Wire.beginTransmission(HTU21_ADDR);
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Wire.write(HTU21_READTEMP);
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if (Wire.endTransmission() != 0) { return false; } // In case of error
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delay(Htu.delay_temp); // Sensor time at max resolution
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Wire.requestFrom(HTU21_ADDR, 3);
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if (3 == Wire.available()) {
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sensorval = Wire.read() << 8; // MSB
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sensorval |= Wire.read(); // LSB
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checksum = Wire.read();
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}
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if (HtuCheckCrc8(sensorval) != checksum) { return false; } // Checksum mismatch
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Htu.temperature = ConvertTemp(0.002681f * (float)sensorval - 46.85f);
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Wire.beginTransmission(HTU21_ADDR);
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Wire.write(HTU21_READHUM);
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if (Wire.endTransmission() != 0) { return false; } // In case of error
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delay(Htu.delay_humidity); // Sensor time at max resolution
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Wire.requestFrom(HTU21_ADDR, 3);
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if (3 <= Wire.available()) {
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sensorval = Wire.read() << 8; // MSB
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sensorval |= Wire.read(); // LSB
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checksum = Wire.read();
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}
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if (HtuCheckCrc8(sensorval) != checksum) { return false; } // Checksum mismatch
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sensorval ^= 0x02; // clear status bits
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Htu.humidity = 0.001907f * (float)sensorval - 6;
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if (Htu.humidity > 100) { Htu.humidity = 100.0f; }
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if (Htu.humidity < 0) { Htu.humidity = 0.01f; }
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if ((0.00f == Htu.humidity) && (0.00f == Htu.temperature)) {
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Htu.humidity = 0.0f;
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}
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if ((Htu.temperature > 0.00f) && (Htu.temperature < 80.00f)) {
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Htu.humidity = (-0.15f) * (25 - Htu.temperature) + Htu.humidity;
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}
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Htu.humidity = ConvertHumidity(Htu.humidity);
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Htu.valid = SENSOR_MAX_MISS;
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return true;
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}
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/********************************************************************************************/
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void HtuDetect(void)
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{
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Htu.address = HTU21_ADDR;
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if (!I2cSetDevice(Htu.address)) { return; }
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Htu.type = HtuReadDeviceId();
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if (Htu.type) {
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uint8_t index = 0;
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HtuInit();
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switch (Htu.type) {
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case HTU21_CHIPID:
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Htu.delay_temp = 50;
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Htu.delay_humidity = 16;
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break;
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case SI7021_CHIPID:
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index++; // 3
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case SI7020_CHIPID:
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index++; // 2
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case SI7013_CHIPID:
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index++; // 1
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Htu.delay_temp = 12;
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Htu.delay_humidity = 23;
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break;
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default:
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index = 4;
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Htu.delay_temp = 50;
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Htu.delay_humidity = 23;
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}
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GetTextIndexed(Htu.types, sizeof(Htu.types), index, kHtuTypes);
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I2cSetActiveFound(Htu.address, Htu.types);
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}
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}
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void HtuEverySecond(void)
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{
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if (TasmotaGlobal.uptime &1) { // Every 2 seconds
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// HTU21: 68mS, SI70xx: 37mS
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if (!HtuRead()) {
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AddLogMissed(Htu.types, Htu.valid);
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}
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}
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}
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void HtuShow(bool json)
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{
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if (Htu.valid) {
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TempHumDewShow(json, (0 == TasmotaGlobal.tele_period), Htu.types, Htu.temperature, Htu.humidity);
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns08(uint32_t function)
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{
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if (!I2cEnabled(XI2C_09)) { return false; }
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bool result = false;
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if (FUNC_INIT == function) {
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HtuDetect();
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}
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else if (Htu.type) {
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switch (function) {
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case FUNC_EVERY_SECOND:
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HtuEverySecond();
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break;
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case FUNC_JSON_APPEND:
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HtuShow(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
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HtuShow(0);
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break;
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#endif // USE_WEBSERVER
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}
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}
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return result;
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}
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#endif // USE_HTU
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#endif // USE_I2C
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