TVout library interferes with my interrupts

Projects Programming
1

Hi, I'm trying to use the Arduino Mega 2560 with a PS/2 keyboard and the TVout library.

Below you can see that I attached an interrupt to pin 19 which is the clock signal from the keyboard, then set pin 25 to input for the keyboard data, then I started TVout.

void setup() {
  attachInterrupt(digitalPinToInterrupt(19), keystroke, FALLING);
  pinMode(25, INPUT);
  TV.begin(_NTSC,128,96);
  TV.select_font(font6x8);
  TV.println("Keyboard v3.0\nTerminal\n");
}

The interrupt runs this function:

void keystroke() {
  buff[bit] = digitalRead(25); //reads current bit from keyboard
  bit += 1; //advances for next bit
}

The problem is that when the Arduino is receiving data from the keyboard, the video output starts glitching and keystrokes don't register properly. Is there some way I could somehow disable video output before reading data? Or something else. Thanks in advance!

2

Have you checked to be sure the TV library is not blocking your code when it uses interrupts?
Paul

3

The TV library does block out my code whenever it triggers the H-SYNC, so I'm just trying to figure out how to prevent it from missing bits.

4

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