147 lines
4.6 KiB
C++
147 lines
4.6 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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#ifndef LM75AD_MAX_SENSORS
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#define LM75AD_MAX_SENSORS 8
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#endif
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#define LM75AD_ADDRESS 0x48 // Start address
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#define LM75AD_COUNT 8 // Number of sequential addresses
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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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struct {
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uint8_t address[LM75AD_MAX_SENSORS];
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uint8_t bus[LM75AD_MAX_SENSORS];
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uint8_t count;
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} Lm75;
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void LM75ADDetect(void) {
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if ((LM75AD_MAX_SENSORS < 1) || (LM75AD_MAX_SENSORS > 16)) { return; } // Safeguard user changed LM75AD_MAX_SENSORS out of bounds
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for (uint32_t bus = 0; bus < 2; bus++) {
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for (uint32_t address = LM75AD_ADDRESS; address < LM75AD_ADDRESS + LM75AD_COUNT; address++) {
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if (!I2cSetDevice(address, bus)) { 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, address, LM75_THYST_REGISTER, bus)) {
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if (buffer == 0x4B00) {
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I2cSetActiveFound(address, "LM75AD", bus);
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Lm75.address[Lm75.count] = address;
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Lm75.bus[Lm75.count] = bus;
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Lm75.count++;
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if (LM75AD_MAX_SENSORS == Lm75.count) { return; }
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}
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}
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}
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}
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}
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float LM75ADGetTemp(uint32_t sensor) {
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uint16_t t;
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if (I2cValidRead16(&t, Lm75.address[sensor], LM75_TEMP_REGISTER, Lm75.bus[sensor])) {
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int16_t sign = 1;
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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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return NAN; // Will be changed to "null" by ext_vsprintf_P()
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}
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void LM75ADShow(bool json) {
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bool dual_bus_use = (Lm75.bus[0] != Lm75.bus[Lm75.count -1]);
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for (uint32_t sensor = 0; sensor < Lm75.count; sensor++) {
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// Takes 2ms / LM75
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float t = LM75ADGetTemp(sensor);
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char name[16];
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strlcpy(name, "LM75AD", sizeof(name)); // LM75AD
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if (Lm75.count > 1) {
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snprintf_P(name, sizeof(name), PSTR("%s%c%02X"), name, IndexSeparator(), Lm75.address[sensor]); // LM75AD-49
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#ifdef USE_I2C_BUS2
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if (TasmotaGlobal.i2c_enabled[1] && dual_bus_use) { // Different busses
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snprintf_P(name, sizeof(name), PSTR("%s%c%d"), name, IndexSeparator(), Lm75.bus[sensor] +1); // LM75AD-49-1
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}
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#endif // USE_I2C_BUS2
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}
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if (json) {
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ResponseAppend_P(JSON_SNS_F_TEMP, name, Settings->flag2.temperature_resolution, &t);
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#ifdef USE_DOMOTICZ
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if ((0 == TasmotaGlobal.tele_period) && (0 == sensor)) {
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DomoticzFloatSensor(DZ_TEMP, t);
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}
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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(name, t);
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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 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 (Lm75.count) {
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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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