mysterious problem at startup

I have what I would say is a fairly simple sketch. I am using some of the code from DG21 demo specifically code for the menu system.

In my sketch I am reading some thermistors.Each approx 5 seconds I read the sensors using the steinhart equation process. I sample each one 20 times with a 20 millisecond delay between the samples then average them. As you can see that process takes some time.

In an effort to use the buttons and the menu functions seamlessly  think I have to hold up the thermistor reading process then do my button stuff and then go back to running the processing part of my sketch.

So I have a variable that I call 'runMode' that I set to 1 at startup so that the thermistor reading and processing part of the sketch runs. When the up arrow is pressed I am setting the 'runMode' variable to 0 so that only the button process is running.

The problem is that upon startup the 'runMode' variable is getting changed to 0 even though no buttons are pressed. Furthermore none of the other lines of code where I set the variable to 0 are getting executed.

Here is my void loop()

void loop()
{
  ReadButtons(); //check buttons
  Navigate(); //update menus and perform actions
   
  if ((millis() - lOutputLoop) > 5000)
  {
    lOutputLoop = millis();
     SerialUSB.print(runMode);
    if (runMode)
    {
      twoToTenOut();
      twoToTenOutPrint();
    }
    else
    {
      Indio.analogWrite( 2, 0, true );                // Set channel 2 to bypass
    }
  }
}

Here is the code from the ReadButtuns function slightly altered from the demo.

void ReadButtons()
{
  buttonEnterState = digitalRead(buttonEnterPin);
  buttonUpState = digitalRead(buttonUpPin);
  buttonDownState = digitalRead(buttonDownPin);

  if (buttonEnterState == HIGH && prevBtnEnt == LOW)
  {
    if ((millis() - lastBtnEnt) > transEntInt)
    {
      enterPressed = 1;
    }
    lastBtnEnt = millis();
    lastAdminActionTime = millis();
    SerialUSB.print("Enter Pressed ");
    SerialUSB.println(enterPressed);
  }
  prevBtnEnt = buttonEnterState;

  if (buttonUpState == HIGH && prevBtnUp == LOW && startOK)
  {
    if ((millis() - lastBtnUp) > transInt)
    {
      channel--;
    }
    lastBtnUp = millis();
    lastAdminActionTime = millis();
    SerialUSB.println("UpPressed");

    if (runMode)
    {
      SerialUSB.println("runMode to 0");
      runMode = 0;
      MenuMain();
    }
  }
  prevBtnUp = buttonUpState;

  if (buttonDownState == HIGH && prevBtnDown == LOW)
  {
    if ((millis() - lastBtnDown) > transInt)
    {
      channel++;
    }
    lastBtnDown = millis();
    lastAdminActionTime = millis();
    SerialUSB.println("DownPressed");
  }
  prevBtnDown = buttonDownState;

  if (constrainEnc == 1)
  {
    channel = constrain(channel, channelLowLimit, channelUpLimit);
  }
}

On startup the only thing that is happening is runMode is getting set to 0. This is the only place in the sketch where I set it to 0.  When I comment out the line the variable stays as a 1. The serialUSB.print is not firing, neither is the MainMenu() action.

As you may notice I have added another variable 'startOK' which is initially set to 0 then after the first run of my twoToTen function I set it to 1. This seems to be a work around that is working but I am still concerned how the runMode variable is getting changed to 0 when that 'if' control structure should not fire.

How is that happening?

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Dries Van Craen

Dries Van Craen

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Asked on 5/24/21, 10:28 AM

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