mirror of https://github.com/arendst/Tasmota.git
140 lines
3.6 KiB
C++
140 lines
3.6 KiB
C++
/*
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xsns_39_MAX31865.ino - MAX31865 thermocouple sensor support for Sonoff-Tasmota
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Copyright (C) 2019 Alberto Lopez Siemens
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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_MAX31865
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#ifndef USE_SPI
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#error "MAX31865 requires USE_SPI enabled"
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#endif
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#include "Adafruit_MAX31865.h"
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#define XSNS_47 47
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#if MAX31865_PTD_WIRES == 4
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#define PTD_WIRES MAX31865_4WIRE
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#elif MAX31865_PTD_WIRES == 3
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#define PTD_WIRES MAX31865_3WIRE
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#else
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#define PTD_WIRES MAX31865_2WIRE
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#endif
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int8_t init_status = 0;
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Adafruit_MAX31865 max31865;
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struct MAX31865_Result_Struct {
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uint8_t ErrorCode;
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uint16_t Rtd;
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float PtdResistance;
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float PtdTemp;
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} MAX31865_Result;
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void MAX31865_Init(void){
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if(init_status)
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return;
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max31865.setPins(
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pin[GPIO_SSPI_CS],
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pin[GPIO_SSPI_MOSI],
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pin[GPIO_SSPI_MISO],
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pin[GPIO_SSPI_SCLK]
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);
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if(max31865.begin(PTD_WIRES))
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init_status = 1;
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else
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init_status = -1;
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}
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/*
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* MAX31865_GetResult(void)
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* Acquires the raw data via SPI, checks for MAX31865 errors and fills result structure
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*/
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void MAX31865_GetResult(void){
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uint16_t rtd;
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rtd = max31865.readRTD();
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MAX31865_Result.Rtd = rtd;
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MAX31865_Result.PtdResistance = max31865.rtd_to_resistance(rtd, MAX31865_REF_RES);
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MAX31865_Result.PtdTemp = max31865.rtd_to_temperature(rtd, MAX31865_PTD_RES, MAX31865_REF_RES) + MAX31865_PTD_BIAS;
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}
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void MAX31865_Show(bool Json){
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char temperature[33];
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char resistance[33];
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dtostrfd(MAX31865_Result.PtdResistance, Settings.flag2.temperature_resolution, resistance);
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dtostrfd(MAX31865_Result.PtdTemp, Settings.flag2.temperature_resolution, temperature);
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if(Json){
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ResponseAppend_P(PSTR(",\"MAX31865\":{\"" D_JSON_TEMPERATURE "\":%s,\"" D_JSON_RESISTANCE "\":%s,\"" D_JSON_ERROR "\":%d}"), \
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temperature, resistance, MAX31865_Result.ErrorCode);
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#ifdef USE_DOMOTICZ
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if (0 == tele_period) {
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DomoticzSensor(DZ_TEMP, temperature);
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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) {
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KnxSensor(KNX_TEMPERATURE, MAX31865_Result.PtdTemp);
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}
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#endif // USE_KNX
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} else {
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#ifdef USE_WEBSERVER
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WSContentSend_PD(HTTP_SNS_TEMP, "MAX31865", temperature, TempUnit());
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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 Xsns47(uint8_t function)
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{
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bool result = false;
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if((pin[GPIO_SSPI_MISO] < 99) && (pin[GPIO_SSPI_MOSI] < 99) &&
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(pin[GPIO_SSPI_SCLK] < 99) && (pin[GPIO_SSPI_CS] < 99)) {
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switch (function) {
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case FUNC_INIT:
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MAX31865_Init();
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break;
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case FUNC_EVERY_SECOND:
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MAX31865_GetResult();
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break;
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case FUNC_JSON_APPEND:
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MAX31865_Show(true);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
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MAX31865_Show(false);
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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_MAX31865
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