mirror of
https://github.com/DarkFlippers/unleashed-firmware
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106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/*
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Unitemp - Universal temperature reader
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Copyright (C) 2022 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 "AM2320.h"
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#include "../interfaces/I2CSensor.h"
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const SensorType AM2320_I2C = {
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.typename = "AM2320_I2C",
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.altname = "AM2320 (I2C)",
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.interface = &I2C,
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.datatype = UT_TEMPERATURE | UT_HUMIDITY,
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.pollingInterval = 2000,
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.allocator = unitemp_AM2320_I2C_alloc,
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.mem_releaser = unitemp_AM2320_I2C_free,
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.initializer = unitemp_AM2320_init,
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.deinitializer = unitemp_AM2320_I2C_deinit,
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.updater = unitemp_AM2320_I2C_update};
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static uint16_t AM2320_calc_CRC(uint8_t* ptr, uint8_t len) {
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uint16_t crc = 0xFFFF;
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uint8_t i;
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while(len--) {
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crc ^= *ptr++;
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for(i = 0; i < 8; i++) {
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if(crc & 0x01) {
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crc >>= 1;
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crc ^= 0xA001;
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} else {
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crc >>= 1;
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}
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}
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}
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return crc;
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}
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bool unitemp_AM2320_I2C_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 = 0x5C << 1;
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i2c_sensor->maxI2CAdr = 0x5C << 1;
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return true;
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}
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bool unitemp_AM2320_I2C_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_AM2320_init(Sensor* sensor) {
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//Нечего инициализировать
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UNUSED(sensor);
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return true;
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}
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bool unitemp_AM2320_I2C_deinit(Sensor* sensor) {
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//Нечего деинициализировать
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UNUSED(sensor);
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return true;
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}
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UnitempStatus unitemp_AM2320_I2C_update(Sensor* sensor) {
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I2CSensor* i2c_sensor = (I2CSensor*)sensor->instance;
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uint8_t data[8] = {0x03, 0x00, 0x04};
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//Wake up
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unitemp_i2c_isDeviceReady(i2c_sensor);
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furi_delay_ms(1);
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//Запрос
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if(!unitemp_i2c_writeArray(i2c_sensor, 3, data)) return UT_SENSORSTATUS_TIMEOUT;
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furi_delay_ms(2);
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//Ответ
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if(!unitemp_i2c_readArray(i2c_sensor, 8, data)) return UT_SENSORSTATUS_TIMEOUT;
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if(AM2320_calc_CRC(data, 6) != ((data[7] << 8) | data[6])) {
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return UT_SENSORSTATUS_BADCRC;
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}
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sensor->hum = (float)(((uint16_t)data[2] << 8) | data[3]) / 10;
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//Проверка на отрицательность температуры
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if(!(data[4] & (1 << 7))) {
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sensor->temp = (float)(((uint16_t)data[4] << 8) | data[5]) / 10;
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} else {
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data[4] &= ~(1 << 7);
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sensor->temp = (float)(((uint16_t)data[4] << 8) | data[5]) / -10;
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}
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return UT_SENSORSTATUS_OK;
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}
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