Ug82.begin conflict with spi.begin ?

Projects Programming
1

Hello! I have come across a strange finding using an OLED display and Current sensor that both uses SPI.

The issue is that only one or the other works at a time.

To get the current sensor working I have to move the u8g2.begin call for the OLED in front of the SPI.begin.

To get the OLED display working I have to move the u8g2.begin call after the SPI.begin.

This is my code so far:


#include <Arduino.h>
#include <EEPROM.h>
#include <TimeLib.h>
#include <Servo.h>
#include <Streaming.h>
#include <SPI.h>
#include <Wire.h>
#include "HX711.h"
#include <Adafruit_MAX31856.h>
#include <Adafruit_Sensor.h>
#include <U8g2lib.h>
#include <ezButton.h>

/*--------------------- INPUTS ------ to receive signals ---------------*/

/*--------------------- SPI ---------------------
   pins 11 12 13 are dedicated SPI pins. All SPI devices
   will be connected to these pins. The only extra pins
   needed for the SPI devices are the Chip Select pin.
   See the OUTPUTS declaration section of what CS pins
   are being used.
*/

/*START BUTTON*/
#define STARTER_BUTTON_ON_OFF         30
#define NAVI_BUTTON                   34
#define SELECT_BUTTON                 35

#define HEATER_ON_OFF                 5

/*NOTE: POWER SENSOR*/
/* ^^^ POWER SENSORS are input */
#define CS_CHARGE_V_I_SENSOR          4  //charge enable selection for BB2557/U
#define CS_OUTPUT_V_I_SENSOR          10 //v/i sensor for output
#define CS_DISPLAY                    20 //selection for display
#define CS_ENG_TEMP_PIN               39 //seletion for eng temp 
#define CS_HEATER_TEMP_PIN            40 //selection for heater temp

/*TEMP MAX31856 FAULT PINS*/
#define FAULT_ENGINE                  25
#define FAULT_HEATER                  28

/*DISPLAY PINS*/
#define RES_DISPLAY                   26
#define DC_DISPLAY                    27

/*DISPLAY*/
int flagA = 0;  // flag for the first state of the display
int flagB = 1;  // flag for the second state of the display
struct {
  int power = 0;
  int operationalHours = 0;
  int voltage = 0;
  int fuel = 0;
  int insideBattery = 0;
  char myPower[6];
  char totalHours[6];
  char outputVoltage[6];
  char myFuel[6];
  char intBattery[6];
} mDisplay;
elapsedMillis taskTimer;            // elapsed timer from PJR teensy
unsigned int displayTimer = 1000;   // timer for display
const int SHORT_PRESS_TIME = 1000;
const int LONG_PRESS_TIME  = 1000;
unsigned long pressedTime  = 0;
unsigned long releasedTime = 0;
bool isPressing = false;
bool isLongDetected = false;
bool isShortDetected = false;
unsigned long pressedTime2  = 0;
unsigned long releasedTime2 = 0;
bool isPressing2 = false;
bool isLongDetected2 = false;
bool isShortDetected2 = false;
ezButton button(NAVI_BUTTON);    // navigation button
ezButton button2(SELECT_BUTTON);   // selection button
U8G2_SSD1309_128X64_NONAME0_F_4W_SW_SPI u8g2(U8G2_R0,
    /* clock=*/ 13, /* data=*/ 11, /* cs=*/ CS_DISPLAY,
    /* dc=*/ DC_DISPLAY, /* reset=*/ RES_DISPLAY);

/*TEMPERATURE SENSORS*/
// Use software SPI: CS, DI, DO, CLK
Adafruit_MAX31856 engThermo = Adafruit_MAX31856(CS_ENG_TEMP_PIN, 11, 12, 13);
Adafruit_MAX31856 heaterThermo = Adafruit_MAX31856(CS_HEATER_TEMP_PIN, 11, 12, 13);
/*Engine Temp*/
struct {
  double coldJunction = 0;
  double head = 0;
} engineT;
/*Heater Temp and Heater*/
struct {
  double coldJunction = 0;
  double head = 0;
  int atTemp = 0;
  int heaterSetPoint = 0;
  char heaterTemp[6];
} heaterT;

/*SYSTEM POWER*/
const double voltage_lsb = 0.003125;
const double current_lsb = 0.001068115; // 1.365 milli ohm shunt resistor
/*
   need to do calculations for a 1 milli ohm shunt resistor
   for const double current_lsb
*/
//const double current_lsb = 0.0000305;
/*----OUTPUT POWER SENSOR----*/
double OUTvoltage, OUTcurrent, OUTpower;
byte OUTv1, OUTv2;
double OUTvoltageBytes, OUTcurrentBytes;
byte OUTc1, OUTc2;
/*----CHARGE POWER SENSOR----*/
float CHARGEvoltage, CHARGEcurrent, CHARGEpower;
float CHARGEv1, CHARGEcurrentBytes;
byte CHARGEc1, CHARGEc2;

/*SPI SETUP FOR INA239 PWR SENSOR*/
/*Data is shifted out on Rising edge SCK
   and
   Data is sampled on Falling edge SCK
*/
SPISettings INA239_settings(1000000, MSBFIRST, SPI_MODE1);

void mainDisplay(int heaterTempInt) {
  u8g2.clearBuffer();                    // clear the internal memory

  u8g2.drawLine(75, 0, 75, 64);
  u8g2.drawLine(76, 19, 128, 19);
  u8g2.drawLine(76, 42, 128, 42);

  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(0, 6, "WATTS");          // write something to the internal memory
  u8g2.setFont(u8g2_font_profont29_tf); // 15 pixel font
  u8g2.drawStr(0, 29, mDisplay.myPower);
  //u8g2.drawStr(0, 29, itoa(heaterTempInt, heaterT.heaterTemp, 10));
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(0, 51, "HOURS");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(0, 64, mDisplay.totalHours);
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(40, 51, "VOLTS");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(40, 64, mDisplay.outputVoltage);
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 6, "Quiet");
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 16, "Auto Off");
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 28, "Fuel(%)");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(80, 41, mDisplay.myFuel);
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 51, "IntBatt(%)");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(80, 64, mDisplay.intBattery);

  u8g2.sendBuffer();                    // transfer internal memory to the display
}

void settingsDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "RUNTIME: 23Hr");  //
  u8g2.sendBuffer();                    // transfer internal memory to the display
}

void runtimeDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "RUNTIME: 23 Hr"); //
  u8g2.sendBuffer();                    // transfer internal memory to the display
}

void modeDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "MODE: QUIET");
  u8g2.sendBuffer();
}

void outputVoltageDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "OUTPUT V: 14V");
  u8g2.sendBuffer();
}

void autoOnOffDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "AUTO OFF: ON/OFF    5 MIN");
  u8g2.sendBuffer();
}

void intBattDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "INT BATT: ");
  u8g2.drawStr(50, 6, "SOC");
  u8g2.drawStr(66, 6, mDisplay.intBattery);
  u8g2.drawStr(76, 6, "%");
  u8g2.drawStr(90, 6, "SOH");
  u8g2.drawStr(106, 6, mDisplay.intBattery);
  u8g2.drawStr(116, 6, "%");
  u8g2.sendBuffer();
}

void ezbuttonPress() {
  button.loop(); // MUST call the loop() function first
  button2.loop();

  if (flagA == 0 && flagB == 1) {
    mainDisplay(heaterT.head);
  }
  if (flagA == 1 && flagB == 1) {
    runtimeDisplay();
  }
  if (flagA == 1 && flagB == 2) {
    modeDisplay();
  }
  if (flagA == 1 && flagB == 3) {
    outputVoltageDisplay();
  }
  if (flagA == 1 && flagB == 4) {
    autoOnOffDisplay();
  }
  if (flagA == 1 && flagB == 5) {
    intBattDisplay();
  }

  if (button.isPressed()) {
    pressedTime = millis();
    isPressing = true;
    isLongDetected = false;
    isShortDetected = false;
  }

  if (button2.isPressed()) {
    pressedTime2 = millis();
    isPressing2 = true;
    isLongDetected2 = false;
    isShortDetected2 = false;
  }

  if (isPressing == true && flagA == 1 && isShortDetected == false) {
    releasedTime = millis();
    long pressDuration = releasedTime - pressedTime;

    if (pressDuration < SHORT_PRESS_TIME && button.isReleased()) {
      Serial.println("A short press is detected");
      isShortDetected = true;
      flagB++;
      if (flagB > 5) {
        flagB = 1;
      }
      Serial << flagA << endl;
      Serial << flagB << endl;
    }
  }

  if (isPressing == true && isLongDetected == false) {
    long pressDuration = millis() - pressedTime;

    if (pressDuration > LONG_PRESS_TIME && button.isReleased()) {
      Serial.println("A long press is detected");
      isLongDetected = true;
      flagA++;
      if (flagA > 1) {
        flagA = 0;
        flagB = 1;
      }
      Serial << flagA << endl;
      Serial << flagB << endl;
    }
  }
}


void dataCollector() {
  //  if (taskTimer >= displayTimer) {
  //    taskTimer = 0;
  if (mDisplay.power > 99) {
    mDisplay.power = 0;
    mDisplay.operationalHours = 0;
    mDisplay.voltage = 0;
    mDisplay.fuel = 0;
    mDisplay.insideBattery = 0;
  }
  else {
    itoa(mDisplay.power, mDisplay.myPower, 10);
    itoa(mDisplay.operationalHours, mDisplay.totalHours, 10);
    itoa(mDisplay.voltage, mDisplay.outputVoltage, 10);
    itoa(mDisplay.fuel, mDisplay.myFuel, 10);
    itoa(mDisplay.insideBattery, mDisplay.intBattery, 10);
  }
  mDisplay.power++;
  mDisplay.operationalHours++;
  mDisplay.voltage++;
  mDisplay.fuel++;
  mDisplay.insideBattery++;
  //  }
}

void readID_outPower() {
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);
  SPI.transfer(0x3E << 2 | 0x01);
  byte m1 = SPI.transfer(0x00);
  byte m2 = SPI.transfer(0x00);
  Serial << m1 << " " << m2 << endl;
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void readID_chargePower() {
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);
  SPI.transfer(0x3E << 2 | 0x01);
  byte m1 = SPI.transfer(0x00);
  byte m2 = SPI.transfer(0x00);
  Serial << m1 << " " << m2 << endl;
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void writeShuntCal_outPower(void) {
  /*--- OUTPUT POWER ---*/
  /*
     function to write calibration value based on the shunt resistor used.
     must transfer to register in hexidecimal.
  */
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);       //turn on spi device 1
  SPI.transfer(0x02 << 2 | 0x00);  //SHUNT_CAL REGISTER; SET TO MEASURE <= 35A. OUTPUT SHUNT RESISTANCE: 1.333mOHM
  SPI.transfer(0x04);
  SPI.transfer(0xAE); //0x04AE = 1198
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void writeShuntCal_chargePower(void) {
  /*--- CHARGER POWER ---*/
  /*
    function to write calibration value based on the shunt resistor used.
    must transfer to register in hexidecimal.
  */
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);       //turn on spi device 1
  SPI.transfer(0x02 << 2 | 0x00);  //SHUNT_CAL REGISTER; SET TO MEASURE <= 35A. OUTPUT SHUNT RESISTANCE: 1.365mOHM
  SPI.transfer(0x04);
  SPI.transfer(0xAE); //0x04AE = 1198
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void readVoltage_outPower(void) {
  /*--- OUTPUT POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);        // turn on spi device 1
  SPI.transfer(0x05 << 2 | 0x01);                 //register to read
  OUTv1 = SPI.transfer(0x00);
  OUTv2 = SPI.transfer(0x00);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);       // turn off spi device 1
  SPI.endTransaction();
  OUTvoltageBytes = ((uint32_t)OUTv1 << 8 | OUTv2);
  OUTvoltage = (OUTvoltageBytes) * (voltage_lsb);
}

void readCurrent_outPower(void) {
  /*--- OUTPUT POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);
  SPI.transfer(0x07 << 2 | 0x01);
  OUTc1 = SPI.transfer(0x00);
  OUTc2 = SPI.transfer(0x00);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  SPI.endTransaction();
  OUTcurrentBytes = ((uint32_t)OUTc1 << 8 | OUTc2);
  OUTcurrent = ((OUTcurrentBytes) * (current_lsb)) * (1.25);
}

void readVoltage_chargePower(void) {
  /*--- CHARGER POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);        // turn on spi device 1
  SPI.transfer(0x05 << 2 | 0x01);   //register to read
  CHARGEv1 = SPI.transfer16(0);
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);       // turn off spi device 1
  SPI.endTransaction();
  CHARGEvoltage = (CHARGEv1) * (voltage_lsb);
}

void readCurrent_chargePower(void) {
  /*--- CHARGER POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);
  SPI.transfer(0x07 << 2 | 0x01);
  CHARGEc1 = SPI.transfer(0x00);
  CHARGEc2 = SPI.transfer(0x00);
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  SPI.endTransaction();
  CHARGEcurrentBytes = (CHARGEc1 << 8 | CHARGEc2);
  CHARGEcurrent = ((CHARGEcurrentBytes) * (current_lsb)) * (1.25);
}

float readPower_ManualCalculation_outPower() {
  /*--- OUTPUT POWER ---*/
  OUTpower = (OUTvoltage * OUTcurrent);
  return OUTpower;
}

float readPower_ManualCalculation_chargePower() {
  /*--- CHARGER POWER ---*/
  CHARGEpower = (CHARGEvoltage * CHARGEcurrent);
  return CHARGEpower;
}

void measureEngTemperature() {
  /*--- ENGINE TEMPERATURE ---*/
  engineT.coldJunction = engThermo.readCJTemperature();
  engineT.head = engThermo.readThermocoupleTemperature();
}

void measureHeaterTemperature() {
  /*--- HEATER TEMPERATURE ---*/
  /*trigger a conversion, returns immediately*/
  heaterT.coldJunction = heaterThermo.readCJTemperature();
  heaterT.head = heaterThermo.readThermocoupleTemperature();
}

void setup() {
  /*INPUT SETUP*/
  pinMode(NAVI_BUTTON, INPUT_PULLUP);
  pinMode(SELECT_BUTTON, INPUT_PULLUP);

  pinMode(HEATER_ON_OFF, OUTPUT);

  /*OUTPUT SETUP*/
  pinMode(HEATER_ON_OFF, OUTPUT);
  pinMode(CS_OUTPUT_V_I_SENSOR, OUTPUT);
  pinMode(CS_CHARGE_V_I_SENSOR, OUTPUT);
  pinMode(CS_DISPLAY, OUTPUT);

  digitalWrite(HEATER_ON_OFF, LOW);

  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  digitalWrite(CS_DISPLAY, HIGH);

  /*SETUP BEGINS*/
  u8g2.begin();           // display
  engThermo.begin();      // thermocouple engine
  heaterThermo.begin();   // thermocouple heater
  /*u8g2, engThermo, heaterThermo begins need to
     occur BEFORE Serial and SPI begin for the current sensor to work.
  */
  Serial.begin(115200);   // TEENSY 4.1
  Wire1.begin();          // using I2C Wire1 for SMBUS battery communication
  SPI.begin();            // spi devices

  /*u8g2, engThermo, heaterThermo begins need to
     occur AFTER Serial and SPI begin for the display to work.
  */
  //  u8g2.begin();
  //  engThermo.begin();
  //  heaterThermo.begin();

  /*TEMPERATURE SETUP*/
  Serial.println("MAX31856 thermocouple test");
  //  if ((!engThermo.begin()) && (!heaterThermo.begin())) {
  //    Serial.println("Could not initialize thermocouple.");
  //    while (1) delay(10);
  //  }

  engThermo.setThermocoupleType(MAX31856_TCTYPE_K);
  Serial.print("Thermocouple type: ");
  switch (engThermo.getThermocoupleType() ) {
    case MAX31856_TCTYPE_B: Serial.println("B Type"); break;
    case MAX31856_TCTYPE_E: Serial.println("E Type"); break;
    case MAX31856_TCTYPE_J: Serial.println("J Type"); break;
    case MAX31856_TCTYPE_K: Serial.println("K Type"); break;
    case MAX31856_TCTYPE_N: Serial.println("N Type"); break;
    case MAX31856_TCTYPE_R: Serial.println("R Type"); break;
    case MAX31856_TCTYPE_S: Serial.println("S Type"); break;
    case MAX31856_TCTYPE_T: Serial.println("T Type"); break;
    case MAX31856_VMODE_G8: Serial.println("Voltage x8 Gain mode"); break;
    case MAX31856_VMODE_G32: Serial.println("Voltage x8 Gain mode"); break;
    default: Serial.println("Unknown"); break;
  }
  heaterThermo.setThermocoupleType(MAX31856_TCTYPE_K);
  Serial.print("Thermocouple type: ");
  switch (heaterThermo.getThermocoupleType() ) {
    case MAX31856_TCTYPE_B: Serial.println("B Type"); break;
    case MAX31856_TCTYPE_E: Serial.println("E Type"); break;
    case MAX31856_TCTYPE_J: Serial.println("J Type"); break;
    case MAX31856_TCTYPE_K: Serial.println("K Type"); break;
    case MAX31856_TCTYPE_N: Serial.println("N Type"); break;
    case MAX31856_TCTYPE_R: Serial.println("R Type"); break;
    case MAX31856_TCTYPE_S: Serial.println("S Type"); break;
    case MAX31856_TCTYPE_T: Serial.println("T Type"); break;
    case MAX31856_VMODE_G8: Serial.println("Voltage x8 Gain mode"); break;
    case MAX31856_VMODE_G32: Serial.println("Voltage x8 Gain mode"); break;
    default: Serial.println("Unknown"); break;
  }

  button.setDebounceTime(50);   // set debounce time to 50 milliseconds
  button2.setDebounceTime(50);  // set debounce time to 50 milliseconds
  mainDisplay(heaterT.head);    // set the main display as the startup display

  /*wait for serial port to connect. Needed for native USB port only*/
  //  while (!Serial) {
  //    ;
  //  }
}


/*----------------------------VOID LOOP--------------------------*/

void loop() {
  dataCollector();
  ezbuttonPress();

  /* POWER BOARD TESTING */
  //readID_outPower(0x3E, 2);
  readID_outPower();
  writeShuntCal_outPower();
  readVoltage_outPower();
  readCurrent_outPower();

  Serial << OUTvoltage << " " << OUTcurrent << " " << readPower_ManualCalculation_outPower() << endl;
  Serial << "------------" << endl;

  delay(500);
}
2

The code before setup() is missing.

3

I have edited more into the code now

4

Edit more into the code.

Actually, just post a complete it compiles we can run it ourselves sketch, or it doesn't compile and we can help you figure out why.

In a new addition to this thread. Please use the IDE Autoformat tool if your code isn't. Well formatted.

a7

5

I have edited my code into the above post. It compile with no errors on my end. Only issue is changing the placement of the begins in the setup function changes what gets printed to the serial monitor or the display.

Doing this

#include <Arduino.h>
#include <EEPROM.h>
#include <TimeLib.h>
#include <Servo.h>
#include <Streaming.h>
#include <SPI.h>
#include <Wire.h>
#include "HX711.h"
#include <Adafruit_MAX31856.h>
#include <Adafruit_Sensor.h>
#include <U8g2lib.h>
#include <ezButton.h>

/*--------------------- INPUTS ------ to receive signals ---------------*/

/*--------------------- SPI ---------------------
   pins 11 12 13 are dedicated SPI pins. All SPI devices
   will be connected to these pins. The only extra pins
   needed for the SPI devices are the Chip Select pin.
   See the OUTPUTS declaration section of what CS pins
   are being used.
*/

/*START BUTTON*/
#define STARTER_BUTTON_ON_OFF         30
#define NAVI_BUTTON                   34
#define SELECT_BUTTON                 35

#define HEATER_ON_OFF                 5

/*NOTE: POWER SENSOR*/
/* ^^^ POWER SENSORS are input */
#define CS_CHARGE_V_I_SENSOR          4  //charge enable selection for BB2557/U
#define CS_OUTPUT_V_I_SENSOR          10 //v/i sensor for output
#define CS_DISPLAY                    20 //selection for display
#define CS_ENG_TEMP_PIN               39 //seletion for eng temp 
#define CS_HEATER_TEMP_PIN            40 //selection for heater temp

/*TEMP MAX31856 FAULT PINS*/
#define FAULT_ENGINE                  25
#define FAULT_HEATER                  28

/*DISPLAY PINS*/
#define RES_DISPLAY                   26
#define DC_DISPLAY                    27

/*DISPLAY*/
int flagA = 0;  // flag for the first state of the display
int flagB = 1;  // flag for the second state of the display
struct {
  int power = 0;
  int operationalHours = 0;
  int voltage = 0;
  int fuel = 0;
  int insideBattery = 0;
  char myPower[6];
  char totalHours[6];
  char outputVoltage[6];
  char myFuel[6];
  char intBattery[6];
} mDisplay;
elapsedMillis taskTimer;            // elapsed timer from PJR teensy
unsigned int displayTimer = 1000;   // timer for display
const int SHORT_PRESS_TIME = 1000;
const int LONG_PRESS_TIME  = 1000;
unsigned long pressedTime  = 0;
unsigned long releasedTime = 0;
bool isPressing = false;
bool isLongDetected = false;
bool isShortDetected = false;
unsigned long pressedTime2  = 0;
unsigned long releasedTime2 = 0;
bool isPressing2 = false;
bool isLongDetected2 = false;
bool isShortDetected2 = false;
ezButton button(NAVI_BUTTON);    // navigation button
ezButton button2(SELECT_BUTTON);   // selection button
U8G2_SSD1309_128X64_NONAME0_F_4W_SW_SPI u8g2(U8G2_R0,
    /* clock=*/ 13, /* data=*/ 11, /* cs=*/ CS_DISPLAY,
    /* dc=*/ DC_DISPLAY, /* reset=*/ RES_DISPLAY);

/*TEMPERATURE SENSORS*/
// Use software SPI: CS, DI, DO, CLK
Adafruit_MAX31856 engThermo = Adafruit_MAX31856(CS_ENG_TEMP_PIN, 11, 12, 13);
Adafruit_MAX31856 heaterThermo = Adafruit_MAX31856(CS_HEATER_TEMP_PIN, 11, 12, 13);
/*Engine Temp*/
struct {
  double coldJunction = 0;
  double head = 0;
} engineT;
/*Heater Temp and Heater*/
struct {
  double coldJunction = 0;
  double head = 0;
  int atTemp = 0;
  int heaterSetPoint = 0;
  char heaterTemp[6];
} heaterT;

/*SYSTEM POWER*/
const double voltage_lsb = 0.003125;
const double current_lsb = 0.001068115; // 1.365 milli ohm shunt resistor
/*
   need to do calculations for a 1 milli ohm shunt resistor
   for const double current_lsb
*/
//const double current_lsb = 0.0000305;
/*----OUTPUT POWER SENSOR----*/
double OUTvoltage, OUTcurrent, OUTpower;
byte OUTv1, OUTv2;
double OUTvoltageBytes, OUTcurrentBytes;
byte OUTc1, OUTc2;
/*----CHARGE POWER SENSOR----*/
float CHARGEvoltage, CHARGEcurrent, CHARGEpower;
float CHARGEv1, CHARGEcurrentBytes;
byte CHARGEc1, CHARGEc2;

/*SPI SETUP FOR INA239 PWR SENSOR*/
/*Data is shifted out on Rising edge SCK
   and
   Data is sampled on Falling edge SCK
*/
SPISettings INA239_settings(1000000, MSBFIRST, SPI_MODE1);

void mainDisplay(int heaterTempInt) {
  u8g2.clearBuffer();                    // clear the internal memory

  u8g2.drawLine(75, 0, 75, 64);
  u8g2.drawLine(76, 19, 128, 19);
  u8g2.drawLine(76, 42, 128, 42);

  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(0, 6, "WATTS");          // write something to the internal memory
  u8g2.setFont(u8g2_font_profont29_tf); // 15 pixel font
  u8g2.drawStr(0, 29, mDisplay.myPower);
  //u8g2.drawStr(0, 29, itoa(heaterTempInt, heaterT.heaterTemp, 10));
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(0, 51, "HOURS");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(0, 64, mDisplay.totalHours);
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(40, 51, "VOLTS");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(40, 64, mDisplay.outputVoltage);
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 6, "Quiet");
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 16, "Auto Off");
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 28, "Fuel(%)");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(80, 41, mDisplay.myFuel);
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 51, "IntBatt(%)");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(80, 64, mDisplay.intBattery);

  u8g2.sendBuffer();                    // transfer internal memory to the display
}

void settingsDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "RUNTIME: 23Hr");  //
  u8g2.sendBuffer();                    // transfer internal memory to the display
}

void runtimeDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "RUNTIME: 23 Hr"); //
  u8g2.sendBuffer();                    // transfer internal memory to the display
}

void modeDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "MODE: QUIET");
  u8g2.sendBuffer();
}

void outputVoltageDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "OUTPUT V: 14V");
  u8g2.sendBuffer();
}

void autoOnOffDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "AUTO OFF: ON/OFF    5 MIN");
  u8g2.sendBuffer();
}

void intBattDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "INT BATT: ");
  u8g2.drawStr(50, 6, "SOC");
  u8g2.drawStr(66, 6, mDisplay.intBattery);
  u8g2.drawStr(76, 6, "%");
  u8g2.drawStr(90, 6, "SOH");
  u8g2.drawStr(106, 6, mDisplay.intBattery);
  u8g2.drawStr(116, 6, "%");
  u8g2.sendBuffer();
}

void ezbuttonPress() {
  button.loop(); // MUST call the loop() function first
  button2.loop();

  if (flagA == 0 && flagB == 1) {
    mainDisplay(heaterT.head);
  }
  if (flagA == 1 && flagB == 1) {
    runtimeDisplay();
  }
  if (flagA == 1 && flagB == 2) {
    modeDisplay();
  }
  if (flagA == 1 && flagB == 3) {
    outputVoltageDisplay();
  }
  if (flagA == 1 && flagB == 4) {
    autoOnOffDisplay();
  }
  if (flagA == 1 && flagB == 5) {
    intBattDisplay();
  }

  if (button.isPressed()) {
    pressedTime = millis();
    isPressing = true;
    isLongDetected = false;
    isShortDetected = false;
  }

  if (button2.isPressed()) {
    pressedTime2 = millis();
    isPressing2 = true;
    isLongDetected2 = false;
    isShortDetected2 = false;
  }

  if (isPressing == true && flagA == 1 && isShortDetected == false) {
    releasedTime = millis();
    long pressDuration = releasedTime - pressedTime;

    if (pressDuration < SHORT_PRESS_TIME && button.isReleased()) {
      Serial.println("A short press is detected");
      isShortDetected = true;
      flagB++;
      if (flagB > 5) {
        flagB = 1;
      }
      Serial << flagA << endl;
      Serial << flagB << endl;
    }
  }

  if (isPressing == true && isLongDetected == false) {
    long pressDuration = millis() - pressedTime;

    if (pressDuration > LONG_PRESS_TIME && button.isReleased()) {
      Serial.println("A long press is detected");
      isLongDetected = true;
      flagA++;
      if (flagA > 1) {
        flagA = 0;
        flagB = 1;
      }
      Serial << flagA << endl;
      Serial << flagB << endl;
    }
  }
}


void dataCollector() {
  //  if (taskTimer >= displayTimer) {
  //    taskTimer = 0;
  if (mDisplay.power > 99) {
    mDisplay.power = 0;
    mDisplay.operationalHours = 0;
    mDisplay.voltage = 0;
    mDisplay.fuel = 0;
    mDisplay.insideBattery = 0;
  }
  else {
    itoa(mDisplay.power, mDisplay.myPower, 10);
    itoa(mDisplay.operationalHours, mDisplay.totalHours, 10);
    itoa(mDisplay.voltage, mDisplay.outputVoltage, 10);
    itoa(mDisplay.fuel, mDisplay.myFuel, 10);
    itoa(mDisplay.insideBattery, mDisplay.intBattery, 10);
  }
  mDisplay.power++;
  mDisplay.operationalHours++;
  mDisplay.voltage++;
  mDisplay.fuel++;
  mDisplay.insideBattery++;
  //  }
}

void readID_outPower() {
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);
  SPI.transfer(0x3E << 2 | 0x01);
  byte m1 = SPI.transfer(0x00);
  byte m2 = SPI.transfer(0x00);
  Serial << m1 << " " << m2 << endl;
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void readID_chargePower() {
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);
  SPI.transfer(0x3E << 2 | 0x01);
  byte m1 = SPI.transfer(0x00);
  byte m2 = SPI.transfer(0x00);
  Serial << m1 << " " << m2 << endl;
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void writeShuntCal_outPower(void) {
  /*--- OUTPUT POWER ---*/
  /*
     function to write calibration value based on the shunt resistor used.
     must transfer to register in hexidecimal.
  */
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);       //turn on spi device 1
  SPI.transfer(0x02 << 2 | 0x00);  //SHUNT_CAL REGISTER; SET TO MEASURE <= 35A. OUTPUT SHUNT RESISTANCE: 1.333mOHM
  SPI.transfer(0x04);
  SPI.transfer(0xAE); //0x04AE = 1198
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void writeShuntCal_chargePower(void) {
  /*--- CHARGER POWER ---*/
  /*
    function to write calibration value based on the shunt resistor used.
    must transfer to register in hexidecimal.
  */
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);       //turn on spi device 1
  SPI.transfer(0x02 << 2 | 0x00);  //SHUNT_CAL REGISTER; SET TO MEASURE <= 35A. OUTPUT SHUNT RESISTANCE: 1.365mOHM
  SPI.transfer(0x04);
  SPI.transfer(0xAE); //0x04AE = 1198
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void readVoltage_outPower(void) {
  /*--- OUTPUT POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);        // turn on spi device 1
  SPI.transfer(0x05 << 2 | 0x01);                 //register to read
  OUTv1 = SPI.transfer(0x00);
  OUTv2 = SPI.transfer(0x00);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);       // turn off spi device 1
  SPI.endTransaction();
  OUTvoltageBytes = ((uint32_t)OUTv1 << 8 | OUTv2);
  OUTvoltage = (OUTvoltageBytes) * (voltage_lsb);
}

void readCurrent_outPower(void) {
  /*--- OUTPUT POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);
  SPI.transfer(0x07 << 2 | 0x01);
  OUTc1 = SPI.transfer(0x00);
  OUTc2 = SPI.transfer(0x00);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  SPI.endTransaction();
  OUTcurrentBytes = ((uint32_t)OUTc1 << 8 | OUTc2);
  OUTcurrent = ((OUTcurrentBytes) * (current_lsb)) * (1.25);
}

void readVoltage_chargePower(void) {
  /*--- CHARGER POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);        // turn on spi device 1
  SPI.transfer(0x05 << 2 | 0x01);   //register to read
  CHARGEv1 = SPI.transfer16(0);
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);       // turn off spi device 1
  SPI.endTransaction();
  CHARGEvoltage = (CHARGEv1) * (voltage_lsb);
}

void readCurrent_chargePower(void) {
  /*--- CHARGER POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);
  SPI.transfer(0x07 << 2 | 0x01);
  CHARGEc1 = SPI.transfer(0x00);
  CHARGEc2 = SPI.transfer(0x00);
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  SPI.endTransaction();
  CHARGEcurrentBytes = (CHARGEc1 << 8 | CHARGEc2);
  CHARGEcurrent = ((CHARGEcurrentBytes) * (current_lsb)) * (1.25);
}

float readPower_ManualCalculation_outPower() {
  /*--- OUTPUT POWER ---*/
  OUTpower = (OUTvoltage * OUTcurrent);
  return OUTpower;
}

float readPower_ManualCalculation_chargePower() {
  /*--- CHARGER POWER ---*/
  CHARGEpower = (CHARGEvoltage * CHARGEcurrent);
  return CHARGEpower;
}

void measureEngTemperature() {
  /*--- ENGINE TEMPERATURE ---*/
  engineT.coldJunction = engThermo.readCJTemperature();
  engineT.head = engThermo.readThermocoupleTemperature();
}

void measureHeaterTemperature() {
  /*--- HEATER TEMPERATURE ---*/
  /*trigger a conversion, returns immediately*/
  heaterT.coldJunction = heaterThermo.readCJTemperature();
  heaterT.head = heaterThermo.readThermocoupleTemperature();
}

void setup() {
  /*INPUT SETUP*/
  pinMode(NAVI_BUTTON, INPUT_PULLUP);
  pinMode(SELECT_BUTTON, INPUT_PULLUP);

  pinMode(HEATER_ON_OFF, OUTPUT);

  /*OUTPUT SETUP*/
  pinMode(HEATER_ON_OFF, OUTPUT);
  pinMode(CS_OUTPUT_V_I_SENSOR, OUTPUT);
  pinMode(CS_CHARGE_V_I_SENSOR, OUTPUT);
  pinMode(CS_DISPLAY, OUTPUT);

  digitalWrite(HEATER_ON_OFF, LOW);

  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  digitalWrite(CS_DISPLAY, HIGH);

  /*SETUP BEGINS*/
  //u8g2.begin();           // display
  //engThermo.begin();      // thermocouple engine
  //heaterThermo.begin();   // thermocouple heater
  /*u8g2, engThermo, heaterThermo begins need to
     occur BEFORE Serial and SPI begin for the current sensor to work.
  */
  Serial.begin(115200);   // TEENSY 4.1
  Wire1.begin();          // using I2C Wire1 for SMBUS battery communication
  SPI.begin();            // spi devices

  /*u8g2, engThermo, heaterThermo begins need to
     occur AFTER Serial and SPI begin for the display to work.
  */
  u8g2.begin();
  engThermo.begin();
  heaterThermo.begin();

  /*TEMPERATURE SETUP*/
  Serial.println("MAX31856 thermocouple test");
  //  if ((!engThermo.begin()) && (!heaterThermo.begin())) {
  //    Serial.println("Could not initialize thermocouple.");
  //    while (1) delay(10);
  //  }

  engThermo.setThermocoupleType(MAX31856_TCTYPE_K);
  Serial.print("Thermocouple type: ");
  switch (engThermo.getThermocoupleType() ) {
    case MAX31856_TCTYPE_B: Serial.println("B Type"); break;
    case MAX31856_TCTYPE_E: Serial.println("E Type"); break;
    case MAX31856_TCTYPE_J: Serial.println("J Type"); break;
    case MAX31856_TCTYPE_K: Serial.println("K Type"); break;
    case MAX31856_TCTYPE_N: Serial.println("N Type"); break;
    case MAX31856_TCTYPE_R: Serial.println("R Type"); break;
    case MAX31856_TCTYPE_S: Serial.println("S Type"); break;
    case MAX31856_TCTYPE_T: Serial.println("T Type"); break;
    case MAX31856_VMODE_G8: Serial.println("Voltage x8 Gain mode"); break;
    case MAX31856_VMODE_G32: Serial.println("Voltage x8 Gain mode"); break;
    default: Serial.println("Unknown"); break;
  }
  heaterThermo.setThermocoupleType(MAX31856_TCTYPE_K);
  Serial.print("Thermocouple type: ");
  switch (heaterThermo.getThermocoupleType() ) {
    case MAX31856_TCTYPE_B: Serial.println("B Type"); break;
    case MAX31856_TCTYPE_E: Serial.println("E Type"); break;
    case MAX31856_TCTYPE_J: Serial.println("J Type"); break;
    case MAX31856_TCTYPE_K: Serial.println("K Type"); break;
    case MAX31856_TCTYPE_N: Serial.println("N Type"); break;
    case MAX31856_TCTYPE_R: Serial.println("R Type"); break;
    case MAX31856_TCTYPE_S: Serial.println("S Type"); break;
    case MAX31856_TCTYPE_T: Serial.println("T Type"); break;
    case MAX31856_VMODE_G8: Serial.println("Voltage x8 Gain mode"); break;
    case MAX31856_VMODE_G32: Serial.println("Voltage x8 Gain mode"); break;
    default: Serial.println("Unknown"); break;
  }

  button.setDebounceTime(50);   // set debounce time to 50 milliseconds
  button2.setDebounceTime(50);  // set debounce time to 50 milliseconds
  mainDisplay(heaterT.head);    // set the main display as the startup display

  /*wait for serial port to connect. Needed for native USB port only*/
  //  while (!Serial) {
  //    ;
  //  }
}


/*----------------------------VOID LOOP--------------------------*/

void loop() {
  dataCollector();
  ezbuttonPress();

  /* POWER BOARD TESTING */
  //readID_outPower(0x3E, 2);
  readID_outPower();
  writeShuntCal_outPower();
  readVoltage_outPower();
  readCurrent_outPower();

  Serial << OUTvoltage << " " << OUTcurrent << " " << readPower_ManualCalculation_outPower() << endl;
  Serial << "------------" << endl;

  delay(500);
}

yields serial prints of my current sensor values but no display on the OLED. The display is blank.

Then doing this:

#include <Arduino.h>
#include <EEPROM.h>
#include <TimeLib.h>
#include <Servo.h>
#include <Streaming.h>
#include <SPI.h>
#include <Wire.h>
#include "HX711.h"
#include <Adafruit_MAX31856.h>
#include <Adafruit_Sensor.h>
#include <U8g2lib.h>
#include <ezButton.h>

/*--------------------- INPUTS ------ to receive signals ---------------*/

/*--------------------- SPI ---------------------
   pins 11 12 13 are dedicated SPI pins. All SPI devices
   will be connected to these pins. The only extra pins
   needed for the SPI devices are the Chip Select pin.
   See the OUTPUTS declaration section of what CS pins
   are being used.
*/

/*START BUTTON*/
#define STARTER_BUTTON_ON_OFF         30
#define NAVI_BUTTON                   34
#define SELECT_BUTTON                 35

#define HEATER_ON_OFF                 5

/*NOTE: POWER SENSOR*/
/* ^^^ POWER SENSORS are input */
#define CS_CHARGE_V_I_SENSOR          4  //charge enable selection for BB2557/U
#define CS_OUTPUT_V_I_SENSOR          10 //v/i sensor for output
#define CS_DISPLAY                    20 //selection for display
#define CS_ENG_TEMP_PIN               39 //seletion for eng temp 
#define CS_HEATER_TEMP_PIN            40 //selection for heater temp

/*TEMP MAX31856 FAULT PINS*/
#define FAULT_ENGINE                  25
#define FAULT_HEATER                  28

/*DISPLAY PINS*/
#define RES_DISPLAY                   26
#define DC_DISPLAY                    27

/*DISPLAY*/
int flagA = 0;  // flag for the first state of the display
int flagB = 1;  // flag for the second state of the display
struct {
  int power = 0;
  int operationalHours = 0;
  int voltage = 0;
  int fuel = 0;
  int insideBattery = 0;
  char myPower[6];
  char totalHours[6];
  char outputVoltage[6];
  char myFuel[6];
  char intBattery[6];
} mDisplay;
elapsedMillis taskTimer;            // elapsed timer from PJR teensy
unsigned int displayTimer = 1000;   // timer for display
const int SHORT_PRESS_TIME = 1000;
const int LONG_PRESS_TIME  = 1000;
unsigned long pressedTime  = 0;
unsigned long releasedTime = 0;
bool isPressing = false;
bool isLongDetected = false;
bool isShortDetected = false;
unsigned long pressedTime2  = 0;
unsigned long releasedTime2 = 0;
bool isPressing2 = false;
bool isLongDetected2 = false;
bool isShortDetected2 = false;
ezButton button(NAVI_BUTTON);    // navigation button
ezButton button2(SELECT_BUTTON);   // selection button
U8G2_SSD1309_128X64_NONAME0_F_4W_SW_SPI u8g2(U8G2_R0,
    /* clock=*/ 13, /* data=*/ 11, /* cs=*/ CS_DISPLAY,
    /* dc=*/ DC_DISPLAY, /* reset=*/ RES_DISPLAY);

/*TEMPERATURE SENSORS*/
// Use software SPI: CS, DI, DO, CLK
Adafruit_MAX31856 engThermo = Adafruit_MAX31856(CS_ENG_TEMP_PIN, 11, 12, 13);
Adafruit_MAX31856 heaterThermo = Adafruit_MAX31856(CS_HEATER_TEMP_PIN, 11, 12, 13);
/*Engine Temp*/
struct {
  double coldJunction = 0;
  double head = 0;
} engineT;
/*Heater Temp and Heater*/
struct {
  double coldJunction = 0;
  double head = 0;
  int atTemp = 0;
  int heaterSetPoint = 0;
  char heaterTemp[6];
} heaterT;

/*SYSTEM POWER*/
const double voltage_lsb = 0.003125;
const double current_lsb = 0.001068115; // 1.365 milli ohm shunt resistor
/*
   need to do calculations for a 1 milli ohm shunt resistor
   for const double current_lsb
*/
//const double current_lsb = 0.0000305;
/*----OUTPUT POWER SENSOR----*/
double OUTvoltage, OUTcurrent, OUTpower;
byte OUTv1, OUTv2;
double OUTvoltageBytes, OUTcurrentBytes;
byte OUTc1, OUTc2;
/*----CHARGE POWER SENSOR----*/
float CHARGEvoltage, CHARGEcurrent, CHARGEpower;
float CHARGEv1, CHARGEcurrentBytes;
byte CHARGEc1, CHARGEc2;

/*SPI SETUP FOR INA239 PWR SENSOR*/
/*Data is shifted out on Rising edge SCK
   and
   Data is sampled on Falling edge SCK
*/
SPISettings INA239_settings(1000000, MSBFIRST, SPI_MODE1);

void mainDisplay(int heaterTempInt) {
  u8g2.clearBuffer();                    // clear the internal memory

  u8g2.drawLine(75, 0, 75, 64);
  u8g2.drawLine(76, 19, 128, 19);
  u8g2.drawLine(76, 42, 128, 42);

  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(0, 6, "WATTS");          // write something to the internal memory
  u8g2.setFont(u8g2_font_profont29_tf); // 15 pixel font
  u8g2.drawStr(0, 29, mDisplay.myPower);
  //u8g2.drawStr(0, 29, itoa(heaterTempInt, heaterT.heaterTemp, 10));
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(0, 51, "HOURS");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(0, 64, mDisplay.totalHours);
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(40, 51, "VOLTS");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(40, 64, mDisplay.outputVoltage);
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 6, "Quiet");
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 16, "Auto Off");
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 28, "Fuel(%)");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(80, 41, mDisplay.myFuel);
  u8g2.setFont(u8g2_font_5x8_tf);       // 5 pixel font
  u8g2.drawStr(80, 51, "IntBatt(%)");
  u8g2.setFont(u8g2_font_t0_17b_tf);    // 12 pixel font
  u8g2.drawStr(80, 64, mDisplay.intBattery);

  u8g2.sendBuffer();                    // transfer internal memory to the display
}

void settingsDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "RUNTIME: 23Hr");  //
  u8g2.sendBuffer();                    // transfer internal memory to the display
}

void runtimeDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "RUNTIME: 23 Hr"); //
  u8g2.sendBuffer();                    // transfer internal memory to the display
}

void modeDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "MODE: QUIET");
  u8g2.sendBuffer();
}

void outputVoltageDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "OUTPUT V: 14V");
  u8g2.sendBuffer();
}

void autoOnOffDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "AUTO OFF: ON/OFF    5 MIN");
  u8g2.sendBuffer();
}

void intBattDisplay() {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_5x8_tf);
  u8g2.drawStr(0, 6, "INT BATT: ");
  u8g2.drawStr(50, 6, "SOC");
  u8g2.drawStr(66, 6, mDisplay.intBattery);
  u8g2.drawStr(76, 6, "%");
  u8g2.drawStr(90, 6, "SOH");
  u8g2.drawStr(106, 6, mDisplay.intBattery);
  u8g2.drawStr(116, 6, "%");
  u8g2.sendBuffer();
}

void ezbuttonPress() {
  button.loop(); // MUST call the loop() function first
  button2.loop();

  if (flagA == 0 && flagB == 1) {
    mainDisplay(heaterT.head);
  }
  if (flagA == 1 && flagB == 1) {
    runtimeDisplay();
  }
  if (flagA == 1 && flagB == 2) {
    modeDisplay();
  }
  if (flagA == 1 && flagB == 3) {
    outputVoltageDisplay();
  }
  if (flagA == 1 && flagB == 4) {
    autoOnOffDisplay();
  }
  if (flagA == 1 && flagB == 5) {
    intBattDisplay();
  }

  if (button.isPressed()) {
    pressedTime = millis();
    isPressing = true;
    isLongDetected = false;
    isShortDetected = false;
  }

  if (button2.isPressed()) {
    pressedTime2 = millis();
    isPressing2 = true;
    isLongDetected2 = false;
    isShortDetected2 = false;
  }

  if (isPressing == true && flagA == 1 && isShortDetected == false) {
    releasedTime = millis();
    long pressDuration = releasedTime - pressedTime;

    if (pressDuration < SHORT_PRESS_TIME && button.isReleased()) {
      Serial.println("A short press is detected");
      isShortDetected = true;
      flagB++;
      if (flagB > 5) {
        flagB = 1;
      }
      Serial << flagA << endl;
      Serial << flagB << endl;
    }
  }

  if (isPressing == true && isLongDetected == false) {
    long pressDuration = millis() - pressedTime;

    if (pressDuration > LONG_PRESS_TIME && button.isReleased()) {
      Serial.println("A long press is detected");
      isLongDetected = true;
      flagA++;
      if (flagA > 1) {
        flagA = 0;
        flagB = 1;
      }
      Serial << flagA << endl;
      Serial << flagB << endl;
    }
  }
}


void dataCollector() {
  //  if (taskTimer >= displayTimer) {
  //    taskTimer = 0;
  if (mDisplay.power > 99) {
    mDisplay.power = 0;
    mDisplay.operationalHours = 0;
    mDisplay.voltage = 0;
    mDisplay.fuel = 0;
    mDisplay.insideBattery = 0;
  }
  else {
    itoa(mDisplay.power, mDisplay.myPower, 10);
    itoa(mDisplay.operationalHours, mDisplay.totalHours, 10);
    itoa(mDisplay.voltage, mDisplay.outputVoltage, 10);
    itoa(mDisplay.fuel, mDisplay.myFuel, 10);
    itoa(mDisplay.insideBattery, mDisplay.intBattery, 10);
  }
  mDisplay.power++;
  mDisplay.operationalHours++;
  mDisplay.voltage++;
  mDisplay.fuel++;
  mDisplay.insideBattery++;
  //  }
}

void readID_outPower() {
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);
  SPI.transfer(0x3E << 2 | 0x01);
  byte m1 = SPI.transfer(0x00);
  byte m2 = SPI.transfer(0x00);
  Serial << m1 << " " << m2 << endl;
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void readID_chargePower() {
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);
  SPI.transfer(0x3E << 2 | 0x01);
  byte m1 = SPI.transfer(0x00);
  byte m2 = SPI.transfer(0x00);
  Serial << m1 << " " << m2 << endl;
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void writeShuntCal_outPower(void) {
  /*--- OUTPUT POWER ---*/
  /*
     function to write calibration value based on the shunt resistor used.
     must transfer to register in hexidecimal.
  */
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);       //turn on spi device 1
  SPI.transfer(0x02 << 2 | 0x00);  //SHUNT_CAL REGISTER; SET TO MEASURE <= 35A. OUTPUT SHUNT RESISTANCE: 1.333mOHM
  SPI.transfer(0x04);
  SPI.transfer(0xAE); //0x04AE = 1198
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void writeShuntCal_chargePower(void) {
  /*--- CHARGER POWER ---*/
  /*
    function to write calibration value based on the shunt resistor used.
    must transfer to register in hexidecimal.
  */
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);       //turn on spi device 1
  SPI.transfer(0x02 << 2 | 0x00);  //SHUNT_CAL REGISTER; SET TO MEASURE <= 35A. OUTPUT SHUNT RESISTANCE: 1.365mOHM
  SPI.transfer(0x04);
  SPI.transfer(0xAE); //0x04AE = 1198
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  SPI.endTransaction();
}

void readVoltage_outPower(void) {
  /*--- OUTPUT POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);        // turn on spi device 1
  SPI.transfer(0x05 << 2 | 0x01);                 //register to read
  OUTv1 = SPI.transfer(0x00);
  OUTv2 = SPI.transfer(0x00);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);       // turn off spi device 1
  SPI.endTransaction();
  OUTvoltageBytes = ((uint32_t)OUTv1 << 8 | OUTv2);
  OUTvoltage = (OUTvoltageBytes) * (voltage_lsb);
}

void readCurrent_outPower(void) {
  /*--- OUTPUT POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, LOW);
  SPI.transfer(0x07 << 2 | 0x01);
  OUTc1 = SPI.transfer(0x00);
  OUTc2 = SPI.transfer(0x00);
  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  SPI.endTransaction();
  OUTcurrentBytes = ((uint32_t)OUTc1 << 8 | OUTc2);
  OUTcurrent = ((OUTcurrentBytes) * (current_lsb)) * (1.25);
}

void readVoltage_chargePower(void) {
  /*--- CHARGER POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);        // turn on spi device 1
  SPI.transfer(0x05 << 2 | 0x01);   //register to read
  CHARGEv1 = SPI.transfer16(0);
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);       // turn off spi device 1
  SPI.endTransaction();
  CHARGEvoltage = (CHARGEv1) * (voltage_lsb);
}

void readCurrent_chargePower(void) {
  /*--- CHARGER POWER ---*/
  SPI.beginTransaction(INA239_settings);
  digitalWrite(CS_CHARGE_V_I_SENSOR, LOW);
  SPI.transfer(0x07 << 2 | 0x01);
  CHARGEc1 = SPI.transfer(0x00);
  CHARGEc2 = SPI.transfer(0x00);
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  SPI.endTransaction();
  CHARGEcurrentBytes = (CHARGEc1 << 8 | CHARGEc2);
  CHARGEcurrent = ((CHARGEcurrentBytes) * (current_lsb)) * (1.25);
}

float readPower_ManualCalculation_outPower() {
  /*--- OUTPUT POWER ---*/
  OUTpower = (OUTvoltage * OUTcurrent);
  return OUTpower;
}

float readPower_ManualCalculation_chargePower() {
  /*--- CHARGER POWER ---*/
  CHARGEpower = (CHARGEvoltage * CHARGEcurrent);
  return CHARGEpower;
}

void measureEngTemperature() {
  /*--- ENGINE TEMPERATURE ---*/
  engineT.coldJunction = engThermo.readCJTemperature();
  engineT.head = engThermo.readThermocoupleTemperature();
}

void measureHeaterTemperature() {
  /*--- HEATER TEMPERATURE ---*/
  /*trigger a conversion, returns immediately*/
  heaterT.coldJunction = heaterThermo.readCJTemperature();
  heaterT.head = heaterThermo.readThermocoupleTemperature();
}

void setup() {
  /*INPUT SETUP*/
  pinMode(NAVI_BUTTON, INPUT_PULLUP);
  pinMode(SELECT_BUTTON, INPUT_PULLUP);

  pinMode(HEATER_ON_OFF, OUTPUT);

  /*OUTPUT SETUP*/
  pinMode(HEATER_ON_OFF, OUTPUT);
  pinMode(CS_OUTPUT_V_I_SENSOR, OUTPUT);
  pinMode(CS_CHARGE_V_I_SENSOR, OUTPUT);
  pinMode(CS_DISPLAY, OUTPUT);

  digitalWrite(HEATER_ON_OFF, LOW);

  digitalWrite(CS_OUTPUT_V_I_SENSOR, HIGH);
  digitalWrite(CS_CHARGE_V_I_SENSOR, HIGH);
  digitalWrite(CS_DISPLAY, HIGH);

  /*SETUP BEGINS*/
  u8g2.begin();           // display
  engThermo.begin();      // thermocouple engine
  heaterThermo.begin();   // thermocouple heater
  /*u8g2, engThermo, heaterThermo begins need to
     occur BEFORE Serial and SPI begin for the current sensor to work.
  */
  Serial.begin(115200);   // TEENSY 4.1
  Wire1.begin();          // using I2C Wire1 for SMBUS battery communication
  SPI.begin();            // spi devices

  /*u8g2, engThermo, heaterThermo begins need to
     occur AFTER Serial and SPI begin for the display to work.
  */
  //  u8g2.begin();
  //  engThermo.begin();
  //  heaterThermo.begin();

  /*TEMPERATURE SETUP*/
  Serial.println("MAX31856 thermocouple test");
  //  if ((!engThermo.begin()) && (!heaterThermo.begin())) {
  //    Serial.println("Could not initialize thermocouple.");
  //    while (1) delay(10);
  //  }

  engThermo.setThermocoupleType(MAX31856_TCTYPE_K);
  Serial.print("Thermocouple type: ");
  switch (engThermo.getThermocoupleType() ) {
    case MAX31856_TCTYPE_B: Serial.println("B Type"); break;
    case MAX31856_TCTYPE_E: Serial.println("E Type"); break;
    case MAX31856_TCTYPE_J: Serial.println("J Type"); break;
    case MAX31856_TCTYPE_K: Serial.println("K Type"); break;
    case MAX31856_TCTYPE_N: Serial.println("N Type"); break;
    case MAX31856_TCTYPE_R: Serial.println("R Type"); break;
    case MAX31856_TCTYPE_S: Serial.println("S Type"); break;
    case MAX31856_TCTYPE_T: Serial.println("T Type"); break;
    case MAX31856_VMODE_G8: Serial.println("Voltage x8 Gain mode"); break;
    case MAX31856_VMODE_G32: Serial.println("Voltage x8 Gain mode"); break;
    default: Serial.println("Unknown"); break;
  }
  heaterThermo.setThermocoupleType(MAX31856_TCTYPE_K);
  Serial.print("Thermocouple type: ");
  switch (heaterThermo.getThermocoupleType() ) {
    case MAX31856_TCTYPE_B: Serial.println("B Type"); break;
    case MAX31856_TCTYPE_E: Serial.println("E Type"); break;
    case MAX31856_TCTYPE_J: Serial.println("J Type"); break;
    case MAX31856_TCTYPE_K: Serial.println("K Type"); break;
    case MAX31856_TCTYPE_N: Serial.println("N Type"); break;
    case MAX31856_TCTYPE_R: Serial.println("R Type"); break;
    case MAX31856_TCTYPE_S: Serial.println("S Type"); break;
    case MAX31856_TCTYPE_T: Serial.println("T Type"); break;
    case MAX31856_VMODE_G8: Serial.println("Voltage x8 Gain mode"); break;
    case MAX31856_VMODE_G32: Serial.println("Voltage x8 Gain mode"); break;
    default: Serial.println("Unknown"); break;
  }

  button.setDebounceTime(50);   // set debounce time to 50 milliseconds
  button2.setDebounceTime(50);  // set debounce time to 50 milliseconds
  mainDisplay(heaterT.head);    // set the main display as the startup display

  /*wait for serial port to connect. Needed for native USB port only*/
  //  while (!Serial) {
  //    ;
  //  }
}


/*----------------------------VOID LOOP--------------------------*/

void loop() {
  dataCollector();
  ezbuttonPress();

  /* POWER BOARD TESTING */
  //readID_outPower(0x3E, 2);
  readID_outPower();
  writeShuntCal_outPower();
  readVoltage_outPower();
  readCurrent_outPower();

  Serial << OUTvoltage << " " << OUTcurrent << " " << readPower_ManualCalculation_outPower() << endl;
  Serial << "------------" << endl;

  delay(500);
}

yields the OLED display to work but no serial print from the current sensors. The serial monitor is frozen and blank.

The IDE I am using is Arduino IDE 1.8.19

Thanks.

6

As already requested, post a complete code in one set of code tags all at once. Why make people have to piece together all these disjoint snippets you're posting? Remember, you are the asking others for free help. Make it easy for them to help you.

7

I have edited my previous post. I just wanted to make sure you guys understood the switch around that I found in my code that is possibly creating my issue on my end.

8

SPI is not always SPI. U8g2 tries to increase the SPI speed to what is supported by your display. Maybe try to reduce SPI speed for u8g2 by setting the bus clock to a lower speed like 1MHz (use u8g2reference · olikraus/u8g2 Wiki · GitHub)

Oliver

9

I was able to find a solution. In my code I initialized the U8G2 display and the Temperature sensors using software SPI, but nothing is connected to my controller to use software spi. They are all connected via hardware SPI.

I appreciate those that took the time to look through my situation.

10

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