half-frame

#include <TVout.h>
#include <fontALL.h>
#define W 128
#define H 96

TVout tv;
unsigned char x, y;
unsigned char c;
unsigned char minX, minY, maxX, maxY;
char s[32];
byte midX[96];
long int t1, t2, dt;


void setup()  {
  tv.begin(PAL, W, H);
  initOverlay();
  initInputProcessing();

  tv.select_font(font8x8);
  tv.fill(0);
}


void initOverlay() {
  TCCR1A = 0;
  // Enable timer1.  ICES0 is set to 0 for falling edge detection on input capture pin.
  TCCR1B = _BV(CS10);

  // Enable input capture interrupt
  TIMSK1 |= _BV(ICIE1);

  // Enable external interrupt INT0 on pin 2 with falling edge.
  EIMSK = _BV(INT0);
  EICRA = _BV(ISC01);
}

void initInputProcessing() {
  // Analog Comparator setup
  ADCSRA &= ~_BV(ADEN); // disable ADC
  ADCSRB |= _BV(ACME); // enable ADC multiplexer
  ADMUX &= ~_BV(MUX0);  // select A2 for use as AIN1 (negative voltage of comparator)
  ADMUX |= _BV(MUX1);
  ADMUX &= ~_BV(MUX2);
  ACSR &= ~_BV(ACIE);  // disable analog comparator interrupts
  ACSR &= ~_BV(ACIC);  // disable analog comparator input capture
}

// Required
ISR(INT0_vect) {
  display.scanLine = 0;
}


void loop() {
 // t1 =  tv.millis();
  tv.capture();

  // uncomment if tracking dark objects
 // tv.fill(INVERT);



  // draw bounding box
  tv.fill(2);

  tv.draw_line(126, 95, 127, 0, 1);
 // tv.draw_line(125, 10, 5, 10, 1);

//  tv.delay(21);
 // t2 = tv.millis();
 // tv.set_pixel(20,20,1);
  //tv.print(5, 5, 0);
  tv.resume();
  tv.delay_frame(2);
}