mirror of https://github.com/arendst/Tasmota.git
280 lines
7.6 KiB
C++
280 lines
7.6 KiB
C++
/*
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xsns_06_dht.ino - DHTxx, AM23xx and SI7021 temperature and humidity sensor support for Tasmota
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Copyright (C) 2020 Theo Arends
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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 <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_DHT
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/*********************************************************************************************\
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* DHT11, AM2301 (DHT21, DHT22, AM2302, AM2321), SI7021 - Temperature and Humidy
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*
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* Reading temperature or humidity takes about 250 milliseconds!
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* Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
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* Source: Adafruit Industries https://github.com/adafruit/DHT-sensor-library
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\*********************************************************************************************/
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#define XSNS_06 6
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#define DHT_MAX_SENSORS 4
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#define DHT_MAX_RETRY 8
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uint32_t dht_max_cycles;
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uint8_t dht_data[5];
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uint8_t dht_sensors = 0;
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bool dht_active = true; // DHT configured
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struct DHTSTRUCT {
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uint8_t pin;
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uint8_t type;
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char stype[12];
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uint32_t lastreadtime;
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uint8_t lastresult;
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float t = NAN;
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float h = NAN;
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} Dht[DHT_MAX_SENSORS];
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void DhtReadPrep(void)
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{
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for (uint32_t i = 0; i < dht_sensors; i++) {
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digitalWrite(Dht[i].pin, HIGH);
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}
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}
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int32_t DhtExpectPulse(uint8_t sensor, bool level)
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{
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int32_t count = 0;
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while (digitalRead(Dht[sensor].pin) == level) {
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if (count++ >= (int32_t)dht_max_cycles) {
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return -1; // Timeout
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}
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}
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return count;
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}
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bool DhtRead(uint8_t sensor)
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{
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int32_t cycles[80];
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uint8_t error = 0;
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dht_data[0] = dht_data[1] = dht_data[2] = dht_data[3] = dht_data[4] = 0;
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// digitalWrite(Dht[sensor].pin, HIGH);
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// delay(250);
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if (Dht[sensor].lastresult > DHT_MAX_RETRY) {
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Dht[sensor].lastresult = 0;
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digitalWrite(Dht[sensor].pin, HIGH); // Retry read prep
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delay(250);
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}
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pinMode(Dht[sensor].pin, OUTPUT);
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digitalWrite(Dht[sensor].pin, LOW);
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if (GPIO_SI7021 == Dht[sensor].type) {
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delayMicroseconds(500);
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} else {
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delay(20);
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}
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noInterrupts();
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digitalWrite(Dht[sensor].pin, HIGH);
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delayMicroseconds(40);
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pinMode(Dht[sensor].pin, INPUT_PULLUP);
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delayMicroseconds(10);
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if (-1 == DhtExpectPulse(sensor, LOW)) {
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AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " " D_START_SIGNAL_LOW " " D_PULSE));
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error = 1;
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}
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else if (-1 == DhtExpectPulse(sensor, HIGH)) {
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AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " " D_START_SIGNAL_HIGH " " D_PULSE));
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error = 1;
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}
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else {
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for (uint32_t i = 0; i < 80; i += 2) {
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cycles[i] = DhtExpectPulse(sensor, LOW);
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cycles[i+1] = DhtExpectPulse(sensor, HIGH);
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}
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}
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interrupts();
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if (error) { return false; }
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for (uint32_t i = 0; i < 40; ++i) {
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int32_t lowCycles = cycles[2*i];
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int32_t highCycles = cycles[2*i+1];
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if ((-1 == lowCycles) || (-1 == highCycles)) {
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AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " " D_PULSE));
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return false;
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}
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dht_data[i/8] <<= 1;
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if (highCycles > lowCycles) {
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dht_data[i / 8] |= 1;
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}
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}
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uint8_t checksum = (dht_data[0] + dht_data[1] + dht_data[2] + dht_data[3]) & 0xFF;
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if (dht_data[4] != checksum) {
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char hex_char[15];
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AddLog_P2(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_CHECKSUM_FAILURE " %s =? %02X"),
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ToHex_P(dht_data, 5, hex_char, sizeof(hex_char), ' '), checksum);
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return false;
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}
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return true;
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}
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void DhtReadTempHum(uint8_t sensor)
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{
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if ((NAN == Dht[sensor].h) || (Dht[sensor].lastresult > DHT_MAX_RETRY)) { // Reset after 8 misses
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Dht[sensor].t = NAN;
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Dht[sensor].h = NAN;
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}
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if (DhtRead(sensor)) {
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switch (Dht[sensor].type) {
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case GPIO_DHT11:
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Dht[sensor].h = dht_data[0];
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Dht[sensor].t = dht_data[2] + ((float)dht_data[3] * 0.1f); // Issue #3164
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break;
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case GPIO_DHT22:
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case GPIO_SI7021:
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Dht[sensor].h = ((dht_data[0] << 8) | dht_data[1]) * 0.1;
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Dht[sensor].t = (((dht_data[2] & 0x7F) << 8 ) | dht_data[3]) * 0.1;
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if (dht_data[2] & 0x80) {
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Dht[sensor].t *= -1;
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}
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break;
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}
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Dht[sensor].t = ConvertTemp(Dht[sensor].t);
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Dht[sensor].h = ConvertHumidity(Dht[sensor].h);
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Dht[sensor].lastresult = 0;
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} else {
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Dht[sensor].lastresult++;
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}
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}
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/********************************************************************************************/
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bool DhtPinState()
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{
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if ((XdrvMailbox.index >= GPIO_DHT11) && (XdrvMailbox.index <= GPIO_SI7021)) {
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if (dht_sensors < DHT_MAX_SENSORS) {
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Dht[dht_sensors].pin = XdrvMailbox.payload;
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Dht[dht_sensors].type = XdrvMailbox.index;
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dht_sensors++;
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XdrvMailbox.index = GPIO_DHT11;
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} else {
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XdrvMailbox.index = 0;
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}
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return true;
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}
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return false;
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}
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void DhtInit(void)
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{
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if (dht_sensors) {
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dht_max_cycles = microsecondsToClockCycles(1000); // 1 millisecond timeout for reading pulses from DHT sensor.
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for (uint32_t i = 0; i < dht_sensors; i++) {
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pinMode(Dht[i].pin, INPUT_PULLUP);
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Dht[i].lastreadtime = 0;
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Dht[i].lastresult = 0;
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GetTextIndexed(Dht[i].stype, sizeof(Dht[i].stype), Dht[i].type, kSensorNames);
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if (dht_sensors > 1) {
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snprintf_P(Dht[i].stype, sizeof(Dht[i].stype), PSTR("%s%c%02d"), Dht[i].stype, IndexSeparator(), Dht[i].pin);
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}
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}
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} else {
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dht_active = false;
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}
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}
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void DhtEverySecond(void)
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{
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if (uptime &1) {
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// <1mS
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DhtReadPrep();
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} else {
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for (uint32_t i = 0; i < dht_sensors; i++) {
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// DHT11 and AM2301 25mS per sensor, SI7021 5mS per sensor
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DhtReadTempHum(i);
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}
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}
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}
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void DhtShow(bool json)
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{
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for (uint32_t i = 0; i < dht_sensors; i++) {
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char temperature[33];
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dtostrfd(Dht[i].t, Settings.flag2.temperature_resolution, temperature);
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char humidity[33];
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dtostrfd(Dht[i].h, Settings.flag2.humidity_resolution, humidity);
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if (json) {
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ResponseAppend_P(JSON_SNS_TEMPHUM, Dht[i].stype, temperature, humidity);
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#ifdef USE_DOMOTICZ
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if ((0 == tele_period) && (0 == i)) {
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DomoticzTempHumSensor(temperature, humidity);
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}
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#endif // USE_DOMOTICZ
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#ifdef USE_KNX
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if ((0 == tele_period) && (0 == i)) {
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KnxSensor(KNX_TEMPERATURE, Dht[i].t);
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KnxSensor(KNX_HUMIDITY, Dht[i].h);
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}
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#endif // USE_KNX
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#ifdef USE_WEBSERVER
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} else {
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WSContentSend_PD(HTTP_SNS_TEMP, Dht[i].stype, temperature, TempUnit());
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WSContentSend_PD(HTTP_SNS_HUM, Dht[i].stype, humidity);
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#endif // USE_WEBSERVER
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}
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns06(uint8_t function)
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{
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bool result = false;
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if (dht_active) {
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switch (function) {
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case FUNC_EVERY_SECOND:
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DhtEverySecond();
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break;
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case FUNC_JSON_APPEND:
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DhtShow(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
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DhtShow(0);
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break;
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#endif // USE_WEBSERVER
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case FUNC_INIT:
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DhtInit();
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break;
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case FUNC_PIN_STATE:
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result = DhtPinState();
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break;
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}
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}
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return result;
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}
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#endif // USE_DHT
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