mirror of
https://github.com/DarkFlippers/unleashed-firmware.git
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108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/*
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Unitemp - Universal temperature reader
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Copyright (C) 2023 Victor Nikitchuk (https://github.com/quen0n)
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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 <https://www.gnu.org/licenses/>.
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*/
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#include "HTU21x.h"
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#include "../interfaces/I2CSensor.h"
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const SensorType HTU21x = {
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.typename = "HTU21x",
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.altname = "HTU21x/SI70xx/SHT2x",
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.interface = &I2C,
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.datatype = UT_DATA_TYPE_TEMP_HUM,
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.pollingInterval = 250,
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.allocator = unitemp_HTU21x_alloc,
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.mem_releaser = unitemp_HTU21x_free,
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.initializer = unitemp_HTU21x_init,
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.deinitializer = unitemp_HTU21x_deinit,
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.updater = unitemp_HTU21x_update};
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static uint8_t checkCRC(uint16_t data) {
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for(uint8_t i = 0; i < 16; i++) {
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if(data & 0x8000)
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data = (data << 1) ^ 0x13100;
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else
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data <<= 1;
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}
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return (data >> 8);
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}
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bool unitemp_HTU21x_alloc(Sensor* sensor, char* args) {
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UNUSED(args);
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I2CSensor* i2c_sensor = (I2CSensor*)sensor->instance;
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//Адреса на шине I2C (7 бит)
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i2c_sensor->minI2CAdr = 0x40 << 1;
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i2c_sensor->maxI2CAdr = 0x41 << 1;
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return true;
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}
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bool unitemp_HTU21x_free(Sensor* sensor) {
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//Нечего высвобождать, так как ничего не было выделено
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UNUSED(sensor);
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return true;
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}
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bool unitemp_HTU21x_init(Sensor* sensor) {
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I2CSensor* i2c_sensor = (I2CSensor*)sensor->instance;
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UNUSED(i2c_sensor);
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return true;
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}
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bool unitemp_HTU21x_deinit(Sensor* sensor) {
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I2CSensor* i2c_sensor = (I2CSensor*)sensor->instance;
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UNUSED(i2c_sensor);
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return true;
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}
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UnitempStatus unitemp_HTU21x_update(Sensor* sensor) {
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I2CSensor* i2c_sensor = (I2CSensor*)sensor->instance;
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//Датчик может быть всего один, так что норм
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static bool temp_hum = false;
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uint8_t data[3];
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if(sensor->status == UT_SENSORSTATUS_POLLING) {
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if(!unitemp_i2c_readArray(i2c_sensor, 3, data)) return UT_SENSORSTATUS_TIMEOUT;
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uint16_t raw = ((uint16_t)data[0] << 8) | data[1];
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if(checkCRC(raw) != data[2]) return UT_SENSORSTATUS_BADCRC;
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if(temp_hum) {
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sensor->temp = (0.002681f * raw - 46.85f);
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} else {
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sensor->hum = ((0.001907 * (raw ^ 0x02)) - 6);
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}
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temp_hum = !temp_hum;
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if(temp_hum) return UT_SENSORSTATUS_EARLYPOOL;
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return UT_SENSORSTATUS_OK;
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}
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if(temp_hum) {
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//Запрос температуры
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data[0] = 0xF3;
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if(!unitemp_i2c_writeArray(i2c_sensor, 1, data)) return UT_SENSORSTATUS_TIMEOUT;
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} else {
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//Запрос влажности
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data[0] = 0xF5;
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if(!unitemp_i2c_writeArray(i2c_sensor, 1, data)) return UT_SENSORSTATUS_TIMEOUT;
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}
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return UT_SENSORSTATUS_POLLING;
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}
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