Tasmota/tasmota/xsns_26_lm75ad.ino

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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
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_I2C
#ifdef USE_LM75AD
/*********************************************************************************************\
* LM75AD - Temperature
*
* Docs at https://www.nxp.com/docs/en/data-sheet/LM75A.pdf
*
* I2C Address: 0x48 - 0x4F
\*********************************************************************************************/
#define XSNS_26 26
#define XI2C_20 20 // See I2CDEVICES.md
#define LM75AD_ADDRESS1 0x48
#define LM75AD_ADDRESS2 0x49
#define LM75AD_ADDRESS3 0x4A
#define LM75AD_ADDRESS4 0x4B
#define LM75AD_ADDRESS5 0x4C
#define LM75AD_ADDRESS6 0x4D
#define LM75AD_ADDRESS7 0x4E
#define LM75AD_ADDRESS8 0x4F
#define LM75_TEMP_REGISTER 0x00
#define LM75_CONF_REGISTER 0x01
#define LM75_THYST_REGISTER 0x02
#define LM75_TOS_REGISTER 0x03
bool lm75ad_type = false;
uint8_t lm75ad_address;
uint8_t lm75ad_addresses[] = { LM75AD_ADDRESS1, LM75AD_ADDRESS2, LM75AD_ADDRESS3, LM75AD_ADDRESS4, LM75AD_ADDRESS5, LM75AD_ADDRESS6, LM75AD_ADDRESS7, LM75AD_ADDRESS8 };
void LM75ADDetect(void)
{
for (uint32_t i = 0; i < sizeof(lm75ad_addresses); i++) {
lm75ad_address = lm75ad_addresses[i];
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if (I2cActive(lm75ad_address)) {
continue; }
if (!I2cSetDevice(lm75ad_address)) {
continue; // do not make the next step without a confirmed device on the bus
}
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uint16_t buffer;
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if (I2cValidRead16(&buffer, lm75ad_address, LM75_THYST_REGISTER)) {
if (buffer == 0x4B00) {
lm75ad_type = true;
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I2cSetActiveFound(lm75ad_address, "LM75AD");
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break;
}
}
}
}
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float LM75ADGetTemp(void)
{
int16_t sign = 1;
uint16_t t = I2cRead16(lm75ad_address, LM75_TEMP_REGISTER);
if (t & 0x8000) { // we are getting a negative temperature value
t = (~t) +0x20;
sign = -1;
}
t = t >> 5; // shift value into place (5 LSB not used)
return ConvertTemp(sign * t * 0.125);
}
void LM75ADShow(bool json)
{
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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);
#ifdef USE_DOMOTICZ
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if (0 == TasmotaGlobal.tele_period) DomoticzFloatSensor(DZ_TEMP, t);
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
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} else {
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WSContentSend_Temp("LM75AD", t);
#endif // USE_WEBSERVER
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns26(uint8_t function)
{
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if (!I2cEnabled(XI2C_20)) { return false; }
bool result = false;
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if (FUNC_INIT == function) {
LM75ADDetect();
}
else if (lm75ad_type) {
switch (function) {
case FUNC_JSON_APPEND:
LM75ADShow(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
LM75ADShow(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_LM75AD
#endif // USE_I2C