I would like to integrate the library for the MAX31865 sensor in Matlab to measure my temperature like in Arduino IDE. For this I need a corresponding header file and a corresponding Matlab class.
Here is the code I have programmed for the header file and the Matlab class. When I try to initialise the Arduino, I get the message that the board cannot be programmed. Where is my error?
a = arduino('COM6', 'Mega2560', 'Libraries', 'Adafruit/MAX31865');
Unable to create a communication link with the serial port. Please check the input argument PORT and verify that a device
is connected.
Header File
**
* @file MAX31865Base.h
*
* Class definition for MAX31865Base class that wraps APIs of Adafruit MAX31865 library
*
* @copyright Copyright 2023
*
*/
#include "LibraryBase.h"
#include "Adafruit_MAX31865.h"
#include "BusIO_Register"
#define MAX_SENSORS 4
Adafruit_MAX31865 *max31865Sensors[MAX_SENSORS];
// Arduino trace commands
const char MSG_MAX31865_CREATE_SENSOR[] PROGMEM = "Adafruit::max31865Sensors[%d] = new Adafruit_MAX31865(%d, %d, %d, %d);\n";
const char MSG_MAX31865_DELETE_SENSOR[] PROGMEM = "Adafruit::delete max31865Sensors[%d];\n";
const char MSG_MAX31865_READ_TEMPERATURE[] PROGMEM = "Adafruit::max31865Sensors[%d]->temperature(%f, %f);\n";
#define CREATE_SENSOR 0x00
#define DELETE_SENSOR 0x01
#define READ_TEMPERATURE 0x02
class AdafruitMAX31865Trace {
public:
static void createSensor(byte sensorNum, int8_t cs, int8_t mosi, int8_t miso, int8_t clk) {
if(sensorNum < MAX_SENSORS){
if (NULL != max31865Sensors[sensorNum]) {
delete(max31865Sensors[sensorNum]);
max31865Sensors[sensorNum] = NULL;
}
max31865Sensors[sensorNum] = new Adafruit_MAX31865(cs, mosi, miso, clk);
max31865Sensors[sensorNum]->begin();
debugPrint(MSG_MAX31865_CREATE_SENSOR, sensorNum, cs, mosi, miso, clk);
}
}
static void deleteSensor(byte sensorNum) {
if(sensorNum < MAX_SENSORS){
delete max31865Sensors[sensorNum];
max31865Sensors[sensorNum] = NULL;
debugPrint(MSG_MAX31865_DELETE_SENSOR, sensorNum);
}
}
static float readTemperature(byte sensorNum, float RTDnominal, float refResistor) {
if(sensorNum < MAX_SENSORS && max31865Sensors[sensorNum] != NULL){
float temp = max31865Sensors[sensorNum]->temperature(RTDnominal, refResistor);
debugPrint(MSG_MAX31865_READ_TEMPERATURE, sensorNum, RTDnominal, refResistor);
return temp;
}
return NAN;
}
};
class MAX31865Base : public LibraryBase
{
public:
MAX31865Base(MWArduinoClass& a)
{
libName = "Adafruit/MAX31865";
a.registerLibrary(this);
}
void setup(){
for (int i = 0; i < MAX_SENSORS; ++i) {
max31865Sensors[i] = NULL;
}
}
// Implementation of LibraryBase
//
public:
void commandHandler(byte cmdID, byte* dataIn, unsigned int payloadSize)
{
switch (cmdID){
case CREATE_SENSOR:{
byte sensorNum = dataIn[0];
int8_t cs = dataIn[1];
int8_t mosi = dataIn[2];
int8_t miso = dataIn[3];
int8_t clk = dataIn[4];
AdafruitMAX31865Trace::createSensor(sensorNum, cs, mosi, miso, clk);
sendResponseMsg(cmdID, 0, 0);
break;
}
case DELETE_SENSOR:{
byte sensorNum = dataIn[0];
AdafruitMAX31865Trace::deleteSensor(sensorNum);
sendResponseMsg(cmdID, 0, 0);
break;
}
case READ_TEMPERATURE:{
byte sensorNum = dataIn[0];
float RTDnominal = *(float*)(dataIn + 1);
float refResistor = *(float*)(dataIn + 5);
float temperature = AdafruitMAX31865Trace::readTemperature(sensorNum, RTDnominal, refResistor);
sendResponseMsg(cmdID, (byte*)&temperature, sizeof(temperature));
break;
}
default:
break;
}
}
};
Matlab Class
classdef MAX31865 < matlabshared.addon.LibraryBase & matlab.mixin.CustomDisplay
properties(Access = private, Constant = true)
CREATE_SENSOR = hex2dec('00');
DELETE_SENSOR = hex2dec('01');
READ_TEMPERATURE = hex2dec('02');
end
properties(Access = protected, Constant = true)
LibraryName = 'Adafruit/MAX31865'
DependentLibraries = {'Servo', 'I2C'}
LibraryHeaderFiles = {'Adafruit_MAX31865/Adafruit_MAX31865'};
CppHeaderFile = fullfile(arduinoio.FilePath(mfilename('fullpath')), 'src', 'MAX31865Base.h')
CppClassName = 'MAX31865Base'
end
properties(Access = public)
SensorNum
end
methods(Access = public)
function obj = MAX31865(parentObj, sensorNum, cs, mosi, miso, clk)
obj.Parent = parentObj;
obj.SensorNum = sensorNum;
% Create the sensor
cmdID = obj.CREATE_SENSOR;
inputs = [sensorNum, cs, mosi, miso, clk];
sendCommand(obj, cmdID, inputs);
end
function temperature = readTemperature(obj, RTDnominal, refResistor)
% Read the temperature from the sensor
cmdID = obj.READ_TEMPERATURE;
inputs = [obj.SensorNum, typecast(single(RTDnominal), 'uint8'), typecast(single(refResistor), 'uint8')];
output = sendCommand(obj, cmdID, inputs);
temperature = typecast(output, 'single');
end
end
end
