Tasmota/tasmota/xsns_65_hdc1080.ino

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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
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_I2C
#ifdef USE_HDC1080
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/*********************************************************************************************\
* HDC1080 - Temperature and Humidity sensor
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*
* Source: Luis Teixeira
*
* I2C Address: 0x40
\*********************************************************************************************/
#define XSNS_65 65
#define XI2C_45 45 // See I2CDEVICES.md
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#define HDC1080_ADDR 0x40
// Registers:
#define HDC_REG_TEMP 0x00 // Temperature register
#define HDC_REG_RH 0x01 // Humidity register
#define HDC_REG_CONFIG 0x02 // Configuration register
#define HDC_REG_SERIAL1 0xFB // First 2 bytes of the serial ID
#define HDC_REG_SERIAL2 0xFC // Mid 2 bytes of the serial ID
#define HDC_REG_SERIAL3 0xFD // Last bits of the serial ID
#define HDC_REG_MAN_ID 0xFE // Manufacturer ID
#define HDC_REG_DEV_ID 0xFF // Device ID
// Expected constant values of some of the registers:
#define HDC1080_MAN_ID 0x5449 // Manufacturer ID (Texas Instruments)
#define HDC1080_DEV_ID 0x1050 // Device ID (valid for the HDC1080)
// Possible values for the configuration register fields:
#define HDC1080_RST_ON 0x8000
#define HDC1080_HEAT_ON 0x2000
#define HDC1080_MODE_ON 0x1000 // acquision mode (temperature + humidity)
#define HDC1080_TRES_11 0x400
#define HDC1080_HRES_11 0x100
#define HDC1080_HRES_8 0x80
// Constants:
#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
#define HDC1080_RH_MULT 0.0015258
#define HDC1080_TEMP_OFFSET 40.0
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const char* hdc_type_name = "HDC1080";
uint16_t hdc_manufacturer_id = 0;
uint16_t hdc_device_id = 0;
float hdc_temperature = 0.0;
float hdc_humidity = 0.0;
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uint8_t hdc_valid = 0;
bool is_reading = false;
uint32_t hdc_next_read;
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/**
* Reads the device ID register.
*
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*/
uint16_t HdcReadDeviceId(void) {
return I2cRead16(HDC1080_ADDR, HDC_REG_DEV_ID);
}
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/**
* Reads the manufacturer ID register.
*
*/
uint16_t HdcReadManufacturerId(void) {
return I2cRead16(HDC1080_ADDR, HDC_REG_MAN_ID);
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}
/**
* Overwrites the configuration register with the provided config
*/
void HdcConfig(uint16_t config) {
I2cWrite16(HDC1080_ADDR, HDC_REG_CONFIG, config);
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}
/**
* Performs a soft reset on the device.
*
* RST = 1 -> software reset
*
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*/
void HdcReset(void) {
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uint16_t current = I2cRead16(HDC1080_ADDR, HDC_REG_CONFIG);
// bit 15 of the configuration register contains the RST flag
// so we set it to 1:
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current |= 0x8000;
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I2cWrite16(HDC1080_ADDR, HDC_REG_CONFIG, current);
delay(HDC1080_CONV_TIME); // Not sure how long it takes to reset. Assuming this value.
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}
/**
* Performs the write portion of the HDC1080 sensor transaction. This
* action of writing to a register signals the beginning of the operation
* (e.g. data acquisition).
*
* addr: the address of the I2C device we are talking to.
* reg: the register where we are writing to.
*
* returns: 0 if the transmission was successfully completed, != 0 otherwise.
*/
int8_t HdcTransactionOpen(uint8_t addr, uint8_t reg) {
Wire.beginTransmission((uint8_t) addr);
Wire.write((uint8_t) reg);
return Wire.endTransmission();
}
/**
* Performs the read portion of the HDC1080 sensor transaction.
*
* addr: the address of the I2C device we are talking to.
* reg_data: the pointer to the memory location where we will place the bytes that were read from the device
* len: the number of bytes we expect to read
*
* returns: if the read operation was successful. != 0 otherwise.
*/
int8_t HdcTransactionClose(uint8_t addr, uint8_t *reg_data, uint16_t len) {
if (len != Wire.requestFrom((uint8_t) addr, (uint8_t) len)) {
return 1;
}
while (len--) {
*reg_data = (uint8_t)Wire.read();
reg_data++;
}
return 0;
}
/**
* The various initialization steps for this sensor.
*
*/
void HdcInit(void) {
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HdcReset();
HdcConfig(HDC1080_MODE_ON);
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}
/**
* Triggers the single transaction read of the T/RH sensor.
*
*/
bool HdcTriggerRead(void) {
int8_t status = HdcTransactionOpen(HDC1080_ADDR, HDC_REG_TEMP);
hdc_next_read = millis() + HDC1080_CONV_TIME;
if(status) {
AddLog_P(LOG_LEVEL_DEBUG, PSTR("HdcTriggerRead: failed to open the transaction for HDC_REG_TEMP. Status = %d"), status);
return false;
}
is_reading = true;
return true;
}
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/**
* Performs a temperature and humidity measurement, and calls
* the conversion function providing the results in the correct
* unit according to the device settings.
*
* returns: false if something failed during the read process.
*
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*/
bool HdcRead(void) {
int8_t status = 0;
uint8_t sensor_data[4];
uint16_t temp_data = 0;
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) {
AddLog_P(LOG_LEVEL_DEBUG, PSTR("HdcRead: failed to read HDC_REG_TEMP. Status = %d"), status);
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return false;
}
temp_data = (uint16_t) ((sensor_data[0] << 8) | sensor_data[1]);
rh_data = (uint16_t) ((sensor_data[2] << 8) | sensor_data[3]);
AddLog_P(LOG_LEVEL_DEBUG, PSTR("HdcRead: temperature raw data: 0x%04x; humidity raw data: 0x%04x"), temp_data, rh_data);
// 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);
hdc_humidity = HDC1080_RH_MULT * (float) (rh_data);
if (hdc_humidity > 100) { hdc_humidity = 100.0; }
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if (hdc_humidity < 0) { hdc_humidity = 0.01; }
hdc_humidity = ConvertHumidity(hdc_humidity);
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hdc_valid = SENSOR_MAX_MISS;
return true;
}
/**
* Performs the detection of the HTC1080 sensor.
*
*/
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void HdcDetect(void) {
if (I2cActive(HDC1080_ADDR)) {
// AddLog_P(LOG_LEVEL_DEBUG, PSTR("HdcDetect: Address = 0x%02X already in use."), HDC1080_ADDR);
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return;
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}
hdc_manufacturer_id = HdcReadManufacturerId();
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();
I2cSetActiveFound(HDC1080_ADDR, hdc_type_name);
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}
}
/**
* As the name suggests, this function is called every second
* for performing driver related logic.
*
*/
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void HdcEverySecond(void) {
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if (TasmotaGlobal.uptime &1) { // Every 2 seconds
if (!HdcTriggerRead()) {
AddLogMissed((char*) hdc_type_name, hdc_valid);
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}
}
}
/**
* Tasmota boilerplate for presenting the sensor data in the web UI, JSON for
* the MQTT messages, and so on.
*
*/
void HdcShow(bool json) {
if (hdc_valid) {
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TempHumDewShow(json, (0 == TasmotaGlobal.tele_period), hdc_type_name, hdc_temperature, hdc_humidity);
}
}
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/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns65(uint8_t function)
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{
if (!I2cEnabled(XI2C_45)) {
// AddLog_P(LOG_LEVEL_DEBUG, PSTR("Xsns65: I2C driver not enabled for this device."));
return false;
}
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bool result = false;
if (FUNC_INIT == function) {
HdcDetect();
}
else if (hdc_device_id) {
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switch (function) {
case FUNC_EVERY_50_MSECOND:
if(is_reading && TimeReached(hdc_next_read)) {
if(!HdcRead()) {
AddLogMissed((char*) hdc_type_name, hdc_valid);
}
}
break;
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case FUNC_EVERY_SECOND:
HdcEverySecond();
break;
case FUNC_JSON_APPEND:
HdcShow(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
HdcShow(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_HDC1080
#endif // USE_I2C