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https://github.com/UberGuidoZ/Flipper.git
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155 lines
4.8 KiB
C
155 lines
4.8 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 "DHT20.h"
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#include "../interfaces/I2CSensor.h"
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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 = 1000,
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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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const SensorType AHT10 = {
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.typename = "AHT10",
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.interface = &I2C,
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.datatype = UT_TEMPERATURE | UT_HUMIDITY,
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.pollingInterval = 1000,
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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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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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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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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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unitemp_i2c_writeArray(i2c_sensor, 3, data);
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furi_delay_ms(5);
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unitemp_i2c_readArray(i2c_sensor, 3, data);
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furi_delay_ms(10);
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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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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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//Адреса на шине I2C (7 бит)
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i2c_sensor->minI2CAdr = 0x38 << 1;
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i2c_sensor->maxI2CAdr = (sensor->type == &DHT20) ? (0x38 << 1) : (0x39 << 1);
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return true;
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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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bool unitemp_DHT20_init(Sensor* sensor) {
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I2CSensor* i2c_sensor = (I2CSensor*)sensor->instance;
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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] = (sensor->type == &DHT20) ? 0xBE : 0xE1;
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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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return true;
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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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UnitempStatus unitemp_DHT20_I2C_update(Sensor* sensor) {
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I2CSensor* i2c_sensor = (I2CSensor*)sensor->instance;
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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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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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if(!unitemp_i2c_readArray(i2c_sensor, 7, data)) return UT_SENSORSTATUS_TIMEOUT;
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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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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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return UT_SENSORSTATUS_OK;
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}
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