Start code

#include <SPI.h>
#include "Adafruit_MAX31855.h"
#include "HX8357_t3n.h"
#include <math.h>
#include <stdio.h>
#include <elapsedMillis.h>
#include <ButtonEvents.h>
#include <ADC.h>
#include <Encoder.h>
#include <PID_v1.h>


// Default connection is using software SPI, but comment and uncomment one of
// the two examples below to switch between software SPI and hardware SPI:

// Example creating a thermocouple instance with software SPI on any three
// digital IO pins.
#define C_BLACK       0x0000
#define C_BLUE        0x001F
#define C_RED         0xF800
#define C_GREEN       0x07E0
#define C_CYAN        0x07FF
#define C_MAGENTA     0xF81F
#define C_YELLOW      0xFFE0
#define C_WHITE       0xFFFF


#define TFT_CS     10
#define TFT_RST    -1
#define TFT_DC      9
#define MAXMISO    12
#define MAXCLK     13 //max31855 nothing else.

#define MAX31855_1 14
#define MAX31855_2 15
#define MAX31855_3 16
#define MAX31855_4 17

SPISettings settingsTFT(25000000, MSBFIRST, SPI_MODE3);
SPISettings SettingsA(5000000, MSBFIRST, SPI_MODE0);

// initialize the Thermocouple
Adafruit_MAX31855 TH1(MAXCLK, MAX31855_1, MAXMISO);

//constructors for TFT without flickering
HX8357_t3n tft = HX8357_t3n(TFT_CS, TFT_DC, TFT_RST);

//flickerfree variables:
float j;
unsigned long StartTime, EndTime;
char str[30];
unsigned long endmicros;  //speed check variables
unsigned long currentmicros;

//arrays for the temperature
float  TC1[12];
float  *pArray_From_TC;
float  pArray_Screen;


//Intervals execution of the various functions
//TFT update:
unsigned long ScreenpreviousMillis = 0;
unsigned long ScreenInterval = 100;//used
//Thermocouple Function update
unsigned long TC_previousMillis = 0;
unsigned long TC_Interval = 1000;//not used
//total update repeat Thermocouple + TFT every Second
unsigned long ValuespreviousMillis = 0;
unsigned long ValuesInterval = 1000;//used

elapsedMillis firstsecond;
elapsedMillis TCmillis;
elapsedMillis TFTmillis;
elapsedMillis Delaymillis;


float TFTscreen(float *pArray_Screen) //Menu 1 //Display
{

//  if (pArray_Screen == nullptr)
//  {
//    Serial.println("TFTSCREEN- NULL pointer Passed!");
//   
//
//    return 0;
//  }
  // get some data
  j += 0.0013;
  currentmicros = micros();
  long value;
  double voltage;
  Serial.println("inside the TFT function");


  tft.setTextColor(C_WHITE, C_BLACK);
  tft.setCursor(0, 20);
  tft.setTextSize(2);
  tft.println(" This is just a test");
  tft.println(" this is just a test ");
  tft.setTextSize(2);

  tft.setTextColor(C_WHITE, C_BLACK);
  tft.setCursor(20, 200);
  tft.print("TempEmag: ");
  Serial.println("pArray_Screen[8]");
  Serial.println(pArray_Screen[8]);
  tft.print(pArray_Screen[8]);

  //  tft.print(j, 2);
  tft.print("    "); // blank out some if new string not as long as previous..
  sprintf(str, "TempEmag: %.2lf\n", pArray_Screen[8]);
  tft.print(str);
  return 0;
}

float *Thermocouples1()
{
  //use this to test the code and the pointers, you dont need to have MAX31855. good idea for debugging
//  for (int i = 0; i < 12; i++) TC1[i] += 0.25;
  if (TH1.readCelsius() < 0) //if temperature is lower than 0   ////Thermocouple 1
  {



    TC1[8] = TH1.readCelsius();
    delay(10);
    TC1[4] = TH1.readInternal();

    if (isnan( TC1[8]))
    {
      Serial.print("Something wrong with Thermocouple ");
    }
    else {
      Serial.print("C = ");
      Serial.println(TC1[8]);
    }
  } else  //this is the 0...500°
  {

    TC1[4] = TH1.readInternal();

    TC1[8] = TH1.readCelsius();
    if (isnan( TC1[8]))
    {
      Serial.print("Something wrong with Thermocouple ");
    }
    else {
      Serial.print("C = ");
      Serial.println(TC1[8]);
    }
    Serial.print("Thermocouples1 Print cArray_TC[8] = ");
    Serial.println(TC1[8]);



  }
  return TC1;
}

void setup()
{
  Serial.begin(9600);
  //SPI CS pins for the MAX31855 need to be set high!
   pinMode(MAX31855_1, OUTPUT); digitalWrite(MAX31855_1, HIGH);
   pinMode(TFT_CS,     OUTPUT); digitalWrite(TFT_CS, HIGH);

  SPI.begin();

  tft.begin();
  tft.setRotation(1);
  tft.fillScreen(C_BLACK);
  tft.fillRect(0, 30, 480, 10, C_RED);
  tft.fillRect(0, 140, 480, 10, C_BLUE);
  uint8_t x = tft.readcommand8(HX8357_RDMODE);
  Serial.print("Display Power Mode: 0x"); Serial.println(x, HEX);
  x = tft.readcommand8(HX8357_RDMADCTL);
  Serial.print("MADCTL Mode: 0x"); Serial.println(x, HEX);
  x = tft.readcommand8(HX8357_RDPIXFMT);
  Serial.print("Pixel Format: 0x"); Serial.println(x, HEX);
  x = tft.readcommand8(HX8357_RDIMGFMT);
  Serial.print("Image Format: 0x"); Serial.println(x, HEX);
  x = tft.readcommand8(HX8357_RDSELFDIAG);
  Serial.print("Self Diagnostic: 0x"); Serial.println(x, HEX);



    if (!TH1.begin())
  {
    while(1);
    Serial.println("Error");
  }



}

void loop()
{
  
  if (TCmillis>=50)

    {
      Thermocouples1();

      TCmillis=TCmillis-50;

    }
    else if (TFTmillis>=255)
    {

      TFTscreen(Thermocouples1());
      TFTmillis=TFTmillis-255;

    }
  
  
 
}