mirror of https://github.com/arendst/Tasmota.git
150 lines
4.4 KiB
C++
150 lines
4.4 KiB
C++
/*
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xsns_39_MAX31865.ino - MAX31865 thermocouple sensor support for Tasmota
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Copyright (C) 2021 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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/*********************************************************************************************\
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* MAX31865 - Thermocouple
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\*********************************************************************************************/
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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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#include "Adafruit_MAX31865.h"
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int8_t max31865_init_status = 0;
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uint8_t max31865_pins_used = 0; //used as a bit array
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Adafruit_MAX31865 max31865[MAX_MAX31865S];
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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[MAX_MAX31865S];
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void MAX31865_Init(void) {
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if (max31865_init_status) { return; }
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max31865_init_status = 1;
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for (uint32_t i = 0; i < MAX_MAX31865S; i++) {
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if (PinUsed(GPIO_SSPI_MAX31865_CS1, i)) {
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max31865_pins_used |= 1 << i; //set lowest bit
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max31865[i].setPins(
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Pin(GPIO_SSPI_MAX31865_CS1, i),
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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[i].begin(PTD_WIRES)) {
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max31865_init_status = -1;
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}
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}
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}
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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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for (uint32_t i = 0; i < MAX_MAX31865S; i++) {
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if (max31865_pins_used & (1 << i)) {
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uint16_t rtd;
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rtd = max31865[i].readRTD();
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MAX31865_Result[i].Rtd = rtd;
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MAX31865_Result[i].PtdResistance = max31865[i].rtd_to_resistance(rtd, MAX31865_REF_RES);
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MAX31865_Result[i].PtdTemp = ConvertTemp(max31865[i].rtd_to_temperature(rtd, MAX31865_PTD_RES, MAX31865_REF_RES) + MAX31865_PTD_BIAS);
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}
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}
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}
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void MAX31865_Show(bool Json) {
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uint8_t report_once = 0;
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for (uint32_t i = 0; i < MAX_MAX31865S; i++) {
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if (max31865_pins_used & (1 << i)) {
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if (Json) {
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ResponseAppend_P(PSTR(",\"MAX31865%c%d\":{\"" D_JSON_TEMPERATURE "\":%*_f,\"" D_JSON_RESISTANCE "\":%*_f,\"" D_JSON_ERROR "\":%d}"), \
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IndexSeparator(), i,
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Settings.flag2.temperature_resolution, &MAX31865_Result[i].PtdTemp,
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Settings.flag2.temperature_resolution, &MAX31865_Result[i].PtdResistance,
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MAX31865_Result[i].ErrorCode);
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if ((0 == TasmotaGlobal.tele_period) && (!report_once)) {
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#ifdef USE_DOMOTICZ
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DomoticzFloatSensor(DZ_TEMP, MAX31865_Result[i].PtdTemp);
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#endif // USE_DOMOTICZ
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#ifdef USE_KNX
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KnxSensor(KNX_TEMPERATURE, MAX31865_Result[i].PtdTemp);
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#endif // USE_KNX
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report_once++;
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}
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#ifdef USE_WEBSERVER
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} else {
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char sensorname[33];
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sprintf(sensorname, "MAX31865%c%d", IndexSeparator(), i);
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WSContentSend_Temp(sensorname, MAX31865_Result[i].PtdTemp);
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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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/*********************************************************************************************\
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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 (PinUsed(GPIO_SSPI_MAX31865_CS1, GPIO_ANY) && PinUsed(GPIO_SSPI_MISO) && PinUsed(GPIO_SSPI_MOSI) && PinUsed(GPIO_SSPI_SCLK)) {
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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(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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MAX31865_Show(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_MAX31865
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