Tasmota/tasmota/xsns_47_max31865.ino

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/*
xsns_39_MAX31865.ino - MAX31865 thermocouple sensor support for Tasmota
Copyright (C) 2019 Alberto Lopez Siemens
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_MAX31865
#ifndef USE_SPI
#error "MAX31865 requires USE_SPI enabled"
#endif
#include "Adafruit_MAX31865.h"
#define XSNS_47 47
#if MAX31865_PTD_WIRES == 4
#define PTD_WIRES MAX31865_4WIRE
#elif MAX31865_PTD_WIRES == 3
#define PTD_WIRES MAX31865_3WIRE
#else
#define PTD_WIRES MAX31865_2WIRE
#endif
int8_t init_status = 0;
Adafruit_MAX31865 max31865;
struct MAX31865_Result_Struct {
uint8_t ErrorCode;
uint16_t Rtd;
float PtdResistance;
float PtdTemp;
} MAX31865_Result;
void MAX31865_Init(void){
if(init_status)
return;
max31865.setPins(
pin[GPIO_SSPI_CS],
pin[GPIO_SSPI_MOSI],
pin[GPIO_SSPI_MISO],
pin[GPIO_SSPI_SCLK]
);
if(max31865.begin(PTD_WIRES))
init_status = 1;
else
init_status = -1;
}
/*
* MAX31865_GetResult(void)
* Acquires the raw data via SPI, checks for MAX31865 errors and fills result structure
*/
void MAX31865_GetResult(void){
uint16_t rtd;
rtd = max31865.readRTD();
MAX31865_Result.Rtd = rtd;
MAX31865_Result.PtdResistance = max31865.rtd_to_resistance(rtd, MAX31865_REF_RES);
MAX31865_Result.PtdTemp = max31865.rtd_to_temperature(rtd, MAX31865_PTD_RES, MAX31865_REF_RES) + MAX31865_PTD_BIAS;
}
void MAX31865_Show(bool Json){
char temperature[33];
char resistance[33];
dtostrfd(MAX31865_Result.PtdResistance, Settings.flag2.temperature_resolution, resistance);
dtostrfd(MAX31865_Result.PtdTemp, Settings.flag2.temperature_resolution, temperature);
if(Json){
ResponseAppend_P(PSTR(",\"MAX31865\":{\"" D_JSON_TEMPERATURE "\":%s,\"" D_JSON_RESISTANCE "\":%s,\"" D_JSON_ERROR "\":%d}"), \
temperature, resistance, MAX31865_Result.ErrorCode);
#ifdef USE_DOMOTICZ
if (0 == tele_period) {
DomoticzSensor(DZ_TEMP, temperature);
}
#endif // USE_DOMOTICZ
#ifdef USE_KNX
if (0 == tele_period) {
KnxSensor(KNX_TEMPERATURE, MAX31865_Result.PtdTemp);
}
#endif // USE_KNX
} else {
#ifdef USE_WEBSERVER
WSContentSend_PD(HTTP_SNS_TEMP, "MAX31865", temperature, TempUnit());
#endif // USE_WEBSERVER
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns47(uint8_t function)
{
bool result = false;
if((pin[GPIO_SSPI_MISO] < 99) && (pin[GPIO_SSPI_MOSI] < 99) &&
(pin[GPIO_SSPI_SCLK] < 99) && (pin[GPIO_SSPI_CS] < 99)) {
switch (function) {
case FUNC_INIT:
MAX31865_Init();
break;
case FUNC_EVERY_SECOND:
MAX31865_GetResult();
break;
case FUNC_JSON_APPEND:
MAX31865_Show(true);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
MAX31865_Show(false);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_MAX31865