mirror of https://github.com/arendst/Tasmota.git
325 lines
8.5 KiB
C++
325 lines
8.5 KiB
C++
/*
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xsns_65_hdc1080.ino - Texas Instruments HDC1080 temperature and humidity sensor support for Tasmota
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Copyright (C) 2021 Luis Teixeira
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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_HDC1080
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/*********************************************************************************************\
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* HDC1080 - Temperature and Humidity sensor
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*
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* Source: Luis Teixeira
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*
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* I2C Address: 0x40
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\*********************************************************************************************/
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#define XSNS_65 65
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#define XI2C_45 45 // See I2CDEVICES.md
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#define HDC1080_ADDR 0x40
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// Registers:
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#define HDC_REG_TEMP 0x00 // Temperature register
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#define HDC_REG_RH 0x01 // Humidity register
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#define HDC_REG_CONFIG 0x02 // Configuration register
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#define HDC_REG_SERIAL1 0xFB // First 2 bytes of the serial ID
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#define HDC_REG_SERIAL2 0xFC // Mid 2 bytes of the serial ID
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#define HDC_REG_SERIAL3 0xFD // Last bits of the serial ID
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#define HDC_REG_MAN_ID 0xFE // Manufacturer ID
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#define HDC_REG_DEV_ID 0xFF // Device ID
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// Expected constant values of some of the registers:
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#define HDC1080_MAN_ID 0x5449 // Manufacturer ID (Texas Instruments)
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#define HDC1080_DEV_ID 0x1050 // Device ID (valid for the HDC1080)
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// Possible values for the configuration register fields:
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#define HDC1080_RST_ON 0x8000
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#define HDC1080_HEAT_ON 0x2000
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#define HDC1080_MODE_ON 0x1000 // acquision mode (temperature + humidity)
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#define HDC1080_TRES_11 0x400
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#define HDC1080_HRES_11 0x100
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#define HDC1080_HRES_8 0x80
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// Constants:
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#define HDC1080_CONV_TIME 15 // Assume 6.50 + 6.35 ms + x of conversion delay for this device
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#define HDC1080_TEMP_MULT 0.0025177
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#define HDC1080_RH_MULT 0.0015258
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#define HDC1080_TEMP_OFFSET 40.0
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const char* hdc_type_name = "HDC1080";
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uint16_t hdc_manufacturer_id = 0;
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uint16_t hdc_device_id = 0;
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float hdc_temperature = 0.0;
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float hdc_humidity = 0.0;
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uint8_t hdc_valid = 0;
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bool is_reading = false;
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uint32_t hdc_next_read;
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/**
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* Reads the device ID register.
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*
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*/
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uint16_t HdcReadDeviceId(void) {
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return I2cRead16(HDC1080_ADDR, HDC_REG_DEV_ID);
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}
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/**
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* Reads the manufacturer ID register.
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*
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*/
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uint16_t HdcReadManufacturerId(void) {
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return I2cRead16(HDC1080_ADDR, HDC_REG_MAN_ID);
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}
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/**
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* Overwrites the configuration register with the provided config
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*/
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void HdcConfig(uint16_t config) {
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I2cWrite16(HDC1080_ADDR, HDC_REG_CONFIG, config);
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}
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/**
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* Performs a soft reset on the device.
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*
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* RST = 1 -> software reset
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*
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*/
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void HdcReset(void) {
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uint16_t current = I2cRead16(HDC1080_ADDR, HDC_REG_CONFIG);
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// bit 15 of the configuration register contains the RST flag
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// so we set it to 1:
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current |= 0x8000;
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I2cWrite16(HDC1080_ADDR, HDC_REG_CONFIG, current);
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delay(HDC1080_CONV_TIME); // Not sure how long it takes to reset. Assuming this value.
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}
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/**
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* Performs the write portion of the HDC1080 sensor transaction. This
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* action of writing to a register signals the beginning of the operation
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* (e.g. data acquisition).
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*
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* addr: the address of the I2C device we are talking to.
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* reg: the register where we are writing to.
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*
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* returns: 0 if the transmission was successfully completed, != 0 otherwise.
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*/
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int8_t HdcTransactionOpen(uint8_t addr, uint8_t reg) {
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Wire.beginTransmission((uint8_t) addr);
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Wire.write((uint8_t) reg);
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return Wire.endTransmission();
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}
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/**
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* Performs the read portion of the HDC1080 sensor transaction.
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*
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* addr: the address of the I2C device we are talking to.
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* reg_data: the pointer to the memory location where we will place the bytes that were read from the device
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* len: the number of bytes we expect to read
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*
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* returns: if the read operation was successful. != 0 otherwise.
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*/
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int8_t HdcTransactionClose(uint8_t addr, uint8_t *reg_data, uint16_t len) {
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if (len != Wire.requestFrom((uint8_t) addr, (uint8_t) len)) {
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return 1;
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}
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while (len--) {
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*reg_data = (uint8_t)Wire.read();
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reg_data++;
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}
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return 0;
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}
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/**
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* The various initialization steps for this sensor.
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*
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*/
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void HdcInit(void) {
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HdcReset();
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HdcConfig(HDC1080_MODE_ON);
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}
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/**
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* Triggers the single transaction read of the T/RH sensor.
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*
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*/
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bool HdcTriggerRead(void) {
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int8_t status = HdcTransactionOpen(HDC1080_ADDR, HDC_REG_TEMP);
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hdc_next_read = millis() + HDC1080_CONV_TIME;
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if(status) {
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AddLog_P(LOG_LEVEL_DEBUG, PSTR("HdcTriggerRead: failed to open the transaction for HDC_REG_TEMP. Status = %d"), status);
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return false;
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}
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is_reading = true;
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return true;
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}
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/**
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* Performs a temperature and humidity measurement, and calls
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* the conversion function providing the results in the correct
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* unit according to the device settings.
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*
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* returns: false if something failed during the read process.
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*
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*/
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bool HdcRead(void) {
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int8_t status = 0;
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uint8_t sensor_data[4];
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uint16_t temp_data = 0;
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uint16_t rh_data = 0;
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is_reading = false;
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status = HdcTransactionClose(HDC1080_ADDR, sensor_data, 4);
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if(status) {
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AddLog_P(LOG_LEVEL_DEBUG, PSTR("HdcRead: failed to read HDC_REG_TEMP. Status = %d"), status);
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return false;
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}
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temp_data = (uint16_t) ((sensor_data[0] << 8) | sensor_data[1]);
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rh_data = (uint16_t) ((sensor_data[2] << 8) | sensor_data[3]);
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AddLog_P(LOG_LEVEL_DEBUG, PSTR("HdcRead: temperature raw data: 0x%04x; humidity raw data: 0x%04x"), temp_data, rh_data);
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// read the temperature from the first 16 bits of the result
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hdc_temperature = ConvertTemp(HDC1080_TEMP_MULT * (float) (temp_data) - HDC1080_TEMP_OFFSET);
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hdc_humidity = HDC1080_RH_MULT * (float) (rh_data);
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if (hdc_humidity > 100) { hdc_humidity = 100.0; }
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if (hdc_humidity < 0) { hdc_humidity = 0.01; }
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hdc_humidity = ConvertHumidity(hdc_humidity);
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hdc_valid = SENSOR_MAX_MISS;
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return true;
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}
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/**
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* Performs the detection of the HTC1080 sensor.
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*
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*/
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void HdcDetect(void) {
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if (I2cActive(HDC1080_ADDR)) {
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// AddLog_P(LOG_LEVEL_DEBUG, PSTR("HdcDetect: Address = 0x%02X already in use."), HDC1080_ADDR);
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return;
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}
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hdc_manufacturer_id = HdcReadManufacturerId();
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hdc_device_id = HdcReadDeviceId();
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AddLog_P(LOG_LEVEL_DEBUG, PSTR("HdcDetect: detected device with manufacturerId = 0x%04X and deviceId = 0x%04X"), hdc_manufacturer_id, hdc_device_id);
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if (hdc_device_id == HDC1080_DEV_ID) {
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HdcInit();
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I2cSetActiveFound(HDC1080_ADDR, hdc_type_name);
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}
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}
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/**
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* As the name suggests, this function is called every second
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* for performing driver related logic.
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*
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*/
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void HdcEverySecond(void) {
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if (TasmotaGlobal.uptime &1) { // Every 2 seconds
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if (!HdcTriggerRead()) {
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AddLogMissed((char*) hdc_type_name, hdc_valid);
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}
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}
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}
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/**
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* Tasmota boilerplate for presenting the sensor data in the web UI, JSON for
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* the MQTT messages, and so on.
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*
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*/
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void HdcShow(bool json) {
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if (hdc_valid) {
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TempHumDewShow(json, (0 == TasmotaGlobal.tele_period), hdc_type_name, hdc_temperature, hdc_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 Xsns65(uint8_t function)
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{
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if (!I2cEnabled(XI2C_45)) {
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// AddLog_P(LOG_LEVEL_DEBUG, PSTR("Xsns65: I2C driver not enabled for this device."));
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return false;
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}
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bool result = false;
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if (FUNC_INIT == function) {
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HdcDetect();
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}
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else if (hdc_device_id) {
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switch (function) {
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case FUNC_EVERY_50_MSECOND:
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if(is_reading && TimeReached(hdc_next_read)) {
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if(!HdcRead()) {
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AddLogMissed((char*) hdc_type_name, hdc_valid);
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}
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}
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break;
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case FUNC_EVERY_SECOND:
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HdcEverySecond();
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break;
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case FUNC_JSON_APPEND:
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HdcShow(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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HdcShow(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_HDC1080
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#endif // USE_I2C
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