Tasmota/tasmota/xsns_47_max31865.ino

153 lines
4.5 KiB
C++

/*
xsns_39_MAX31865.ino - MAX31865 thermocouple sensor support for Tasmota
Copyright (C) 2020 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
/*********************************************************************************************\
* MAX31865 - Thermocouple
\*********************************************************************************************/
#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
#include "Adafruit_MAX31865.h"
int8_t max31865_init_status = 0;
uint8_t max31865_pins_used = 0; //used as a bit array
Adafruit_MAX31865 max31865[MAX_MAX31865S];
struct MAX31865_Result_Struct {
uint8_t ErrorCode;
uint16_t Rtd;
float PtdResistance;
float PtdTemp;
} MAX31865_Result[MAX_MAX31865S];
void MAX31865_Init(void) {
if (max31865_init_status) { return; }
max31865_init_status = 1;
for (uint32_t i = 0; i < MAX_MAX31865S; i++) {
if (PinUsed(GPIO_SSPI_MAX31865_CS1, i)) {
max31865_pins_used |= 1 << i; //set lowest bit
max31865[0].setPins(
Pin(GPIO_SSPI_MAX31865_CS1, i),
Pin(GPIO_SSPI_MOSI),
Pin(GPIO_SSPI_MISO),
Pin(GPIO_SSPI_SCLK)
);
if (!max31865[i].begin(PTD_WIRES)) {
max31865_init_status = -1;
}
}
}
}
/*
* MAX31865_GetResult(void)
* Acquires the raw data via SPI, checks for MAX31865 errors and fills result structure
*/
void MAX31865_GetResult(void) {
for (uint32_t i = 0; i < MAX_MAX31865S; i++) {
if (max31865_pins_used & (1 << i)) {
uint16_t rtd;
rtd = max31865[i].readRTD();
MAX31865_Result[i].Rtd = rtd;
MAX31865_Result[i].PtdResistance = max31865[i].rtd_to_resistance(rtd, MAX31865_REF_RES);
MAX31865_Result[i].PtdTemp = max31865[i].rtd_to_temperature(rtd, MAX31865_PTD_RES, MAX31865_REF_RES) + MAX31865_PTD_BIAS;
}
}
}
void MAX31865_Show(bool Json) {
uint8_t report_once = 0;
for (uint32_t i = 0; i < MAX_MAX31865S; i++) {
if (max31865_pins_used & (1 << i)) {
char temperature[33];
char resistance[33];
dtostrfd(MAX31865_Result[i].PtdResistance, Settings.flag2.temperature_resolution, resistance);
dtostrfd(MAX31865_Result[i].PtdTemp, Settings.flag2.temperature_resolution, temperature);
if (Json) {
ResponseAppend_P(PSTR(",\"MAX31865%c%d\":{\"" D_JSON_TEMPERATURE "\":%s,\"" D_JSON_RESISTANCE "\":%s,\"" D_JSON_ERROR "\":%d}"), \
IndexSeparator(), i, temperature, resistance, MAX31865_Result[i].ErrorCode);
if ((0 == TasmotaGlobal.tele_period) && (!report_once)) {
#ifdef USE_DOMOTICZ
DomoticzSensor(DZ_TEMP, temperature);
#endif // USE_DOMOTICZ
#ifdef USE_KNX
KnxSensor(KNX_TEMPERATURE, MAX31865_Result[i].PtdTemp);
#endif // USE_KNX
report_once++;
}
#ifdef USE_WEBSERVER
} else {
char sensorname[33];
sprintf(sensorname, "MAX31865%c%d", IndexSeparator(), i);
WSContentSend_PD(HTTP_SNS_TEMP, sensorname, temperature, TempUnit());
#endif // USE_WEBSERVER
}
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns47(uint8_t function)
{
bool result = false;
if (PinUsed(GPIO_SSPI_MAX31865_CS1, GPIO_ANY) && PinUsed(GPIO_SSPI_MISO) && PinUsed(GPIO_SSPI_MOSI) && PinUsed(GPIO_SSPI_SCLK)) {
switch (function) {
case FUNC_INIT:
MAX31865_Init();
break;
case FUNC_EVERY_SECOND:
MAX31865_GetResult();
break;
case FUNC_JSON_APPEND:
MAX31865_Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
MAX31865_Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_MAX31865