mirror of https://github.com/arendst/Tasmota.git
129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
/*
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xsns_26_lm75ad.ino - Support for I2C LM75AD Temperature Sensor
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Copyright (C) 2021 Andre Thomas and 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_I2C
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#ifdef USE_LM75AD
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/*********************************************************************************************\
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* LM75AD - Temperature
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*
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* Docs at https://www.nxp.com/docs/en/data-sheet/LM75A.pdf
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*
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* I2C Address: 0x48 - 0x4F
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\*********************************************************************************************/
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#define XSNS_26 26
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#define XI2C_20 20 // See I2CDEVICES.md
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#define LM75AD_ADDRESS1 0x48
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#define LM75AD_ADDRESS2 0x49
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#define LM75AD_ADDRESS3 0x4A
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#define LM75AD_ADDRESS4 0x4B
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#define LM75AD_ADDRESS5 0x4C
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#define LM75AD_ADDRESS6 0x4D
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#define LM75AD_ADDRESS7 0x4E
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#define LM75AD_ADDRESS8 0x4F
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#define LM75_TEMP_REGISTER 0x00
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#define LM75_CONF_REGISTER 0x01
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#define LM75_THYST_REGISTER 0x02
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#define LM75_TOS_REGISTER 0x03
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bool lm75ad_type = false;
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uint8_t lm75ad_address;
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uint8_t lm75ad_addresses[] = { LM75AD_ADDRESS1, LM75AD_ADDRESS2, LM75AD_ADDRESS3, LM75AD_ADDRESS4, LM75AD_ADDRESS5, LM75AD_ADDRESS6, LM75AD_ADDRESS7, LM75AD_ADDRESS8 };
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void LM75ADDetect(void)
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{
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for (uint32_t i = 0; i < sizeof(lm75ad_addresses); i++) {
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lm75ad_address = lm75ad_addresses[i];
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if (!I2cSetDevice(lm75ad_address)) {
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continue; // do not make the next step without a confirmed device on the bus
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}
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uint16_t buffer;
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if (I2cValidRead16(&buffer, lm75ad_address, LM75_THYST_REGISTER)) {
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if (buffer == 0x4B00) {
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lm75ad_type = true;
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I2cSetActiveFound(lm75ad_address, "LM75AD");
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break;
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}
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}
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}
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}
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float LM75ADGetTemp(void)
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{
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int16_t sign = 1;
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uint16_t t = I2cRead16(lm75ad_address, LM75_TEMP_REGISTER);
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if (t & 0x8000) { // we are getting a negative temperature value
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t = (~t) +0x20;
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sign = -1;
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}
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t = t >> 5; // shift value into place (5 LSB not used)
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return ConvertTemp(sign * t * 0.125f);
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}
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void LM75ADShow(bool json)
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{
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float t = LM75ADGetTemp();
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if (json) {
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ResponseAppend_P(JSON_SNS_F_TEMP, "LM75AD", Settings->flag2.temperature_resolution, &t);
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#ifdef USE_DOMOTICZ
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if (0 == TasmotaGlobal.tele_period) DomoticzFloatSensor(DZ_TEMP, t);
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#endif // USE_DOMOTICZ
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#ifdef USE_WEBSERVER
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} else {
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WSContentSend_Temp("LM75AD", t);
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#endif // USE_WEBSERVER
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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 Xsns26(uint32_t function)
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{
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if (!I2cEnabled(XI2C_20)) { return false; }
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bool result = false;
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if (FUNC_INIT == function) {
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LM75ADDetect();
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}
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else if (lm75ad_type) {
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switch (function) {
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case FUNC_JSON_APPEND:
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LM75ADShow(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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LM75ADShow(0);
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break;
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#endif // USE_WEBSERVER
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}
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}
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return result;
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}
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#endif // USE_LM75AD
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#endif // USE_I2C
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