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+/*
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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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+
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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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+
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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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+
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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 "DHT20.h"
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+#include "../interfaces/I2CSensor.h"
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+
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+const SensorType DHT20 = {
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+ .typename = "DHT20",
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+ .altname = "DHT20/AM2108/AHT20",
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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_DHT20_I2C_alloc,
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+ .mem_releaser = unitemp_DHT20_I2C_free,
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+ .initializer = unitemp_DHT20_init,
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+ .deinitializer = unitemp_DHT20_I2C_deinit,
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+ .updater = unitemp_DHT20_I2C_update};
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+
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+static uint8_t DHT20_get_status(I2CSensor* i2c_sensor) {
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+ uint8_t status[1] = {0};
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+ unitemp_i2c_readArray(i2c_sensor, 1, status);
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+ return status[0];
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+}
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+
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+static uint8_t DHT20_calc_CRC8(uint8_t* message, uint8_t Num) {
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+ uint8_t i;
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+ uint8_t byte;
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+ uint8_t crc = 0xFF;
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+ for(byte = 0; byte < Num; byte++) {
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+ crc ^= (message[byte]);
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+ for(i = 8; i > 0; --i) {
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+ if(crc & 0x80)
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+ crc = (crc << 1) ^ 0x31;
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+ else
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+ crc = (crc << 1);
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+ }
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+ }
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+ return crc;
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+}
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+
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+static void DHT20_reset_reg(I2CSensor* i2c_sensor, uint8_t addr) {
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+ uint8_t data[3] = {addr, 0x00, 0x00};
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+
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+ unitemp_i2c_writeArray(i2c_sensor, 3, data);
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+
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+ furi_delay_ms(5);
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+
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+ unitemp_i2c_readArray(i2c_sensor, 3, data);
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+
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+ furi_delay_ms(10);
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+
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+ data[0] = 0xB0 | addr;
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+ unitemp_i2c_writeArray(i2c_sensor, 3, data);
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+}
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+
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+bool unitemp_DHT20_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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+
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+ //Адреса на шине I2C (7 бит)
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+ i2c_sensor->minI2CAdr = 0x38 << 1;
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+ i2c_sensor->maxI2CAdr = 0x38 << 1;
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+ return true;
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+}
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+
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+bool unitemp_DHT20_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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+
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+bool unitemp_DHT20_init(Sensor* sensor) {
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+ I2CSensor* i2c_sensor = (I2CSensor*)sensor->instance;
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+
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+ uint8_t data[3] = {0xA8, 0x00, 0x00};
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+ if(!unitemp_i2c_writeArray(i2c_sensor, 3, data)) return false;
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+ furi_delay_ms(10);
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+ data[0] = 0xBE;
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+ data[1] = 0x08;
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+ if(!unitemp_i2c_writeArray(i2c_sensor, 3, data)) return false;
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+ furi_delay_ms(10);
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+
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+ return true;
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+}
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+
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+bool unitemp_DHT20_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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+
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+UnitempStatus unitemp_DHT20_I2C_update(Sensor* sensor) {
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+ I2CSensor* i2c_sensor = (I2CSensor*)sensor->instance;
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+
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+ if(DHT20_get_status(i2c_sensor) != 0x18) {
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+ DHT20_reset_reg(i2c_sensor, 0x1B);
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+ DHT20_reset_reg(i2c_sensor, 0x1C);
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+ DHT20_reset_reg(i2c_sensor, 0x1E);
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+ }
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+ furi_delay_ms(10);
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+
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+ uint8_t data[7] = {0xAC, 0x33, 0x00};
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+ if(!unitemp_i2c_writeArray(i2c_sensor, 3, data)) return UT_SENSORSTATUS_TIMEOUT;
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+ furi_delay_ms(80);
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+ uint32_t t = furi_get_tick();
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+ while(DHT20_get_status(i2c_sensor) == 0x80) {
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+ if(furi_get_tick() - t > 10) return UT_SENSORSTATUS_TIMEOUT;
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+ }
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+
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+ if(!unitemp_i2c_readArray(i2c_sensor, 7, data)) return UT_SENSORSTATUS_TIMEOUT;
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+
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+ if(DHT20_calc_CRC8(data, 6) != data[6]) {
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+ return UT_SENSORSTATUS_BADCRC;
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+ }
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+ uint32_t RetuData = 0;
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+ RetuData = (RetuData | data[1]) << 8;
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+ RetuData = (RetuData | data[2]) << 8;
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+ RetuData = (RetuData | data[3]);
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+ RetuData = RetuData >> 4;
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+ sensor->hum = RetuData * 100 * 10 / 1024.0f / 1024.0f / 10.0f;
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+
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+ RetuData = 0;
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+ RetuData = (RetuData | data[3]) << 8;
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+ RetuData = (RetuData | data[4]) << 8;
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+ RetuData = (RetuData | data[5]);
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+ RetuData = RetuData & 0xfffff;
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+ sensor->temp = (RetuData * 200 * 10.0f / 1024.0f / 1024.0f - 500) / 10.0f;
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+
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+ return UT_SENSORSTATUS_OK;
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+}
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Victor