MKR Zero USB Keyboard Interrupt

Projects Programming
1

Hello,
I am trying to read the USB keyboard attached with the MKR Zero USB port to generate interrupt through following program. I have given digital pin number 22/23 to USB port pin. However, the inbuilt LED is not reacting. I have also attached an i2c 16 by 2 LCD.

const byte LED = 32;
const byte BUTTON = 23;
// Require keyboard control library
#include <KeyboardController.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
// Initialize USB Controller
USBHost usb;

// Attach keyboard controller to USB
KeyboardController keyboard(usb);

// This function intercepts key press
void keyPressed() {
   lcd.write(keyboard.getKey());
}

// Interrupt Service Routine (ISR)
void switchPressed ()
{
  if (digitalRead (BUTTON) == LOW)
    digitalWrite (LED, HIGH);
  else
    digitalWrite (LED, LOW);
}  // end of switchPressed

void setup ()
{
  lcd.init();
	// Turn on the blacklight and print a message.
	lcd.backlight();
  lcd.print("Program started");
  pinMode (LED, OUTPUT);  // so we can update the LED
  digitalWrite (BUTTON, HIGH);  // internal pull-up resistor
  attachInterrupt (digitalPinToInterrupt (BUTTON), switchPressed, CHANGE);  // attach interrupt handler
}  // end of setup

void loop ()
{
    usb.Task();
    // loop doing nothing 
}

This is a part of a bigger project on which I have been working for several months. Any help is greatly appreciated.

The USB pin number I got from here -
variant1.txt (19.0 KB)

Thanks, and Regards.

2

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