#define HORIZ_PIXELS 240 // must be multiple of 8
#define HORIZ_FRONT_PORCH 10
#define HORIZ_SYNC 7
#define HORIZ_BACK_PORCH 5

#define VERT_PIXELS 320
#define VERT_FRONT_PORCH 63
#define VERT_SYNC 4
#define VERT_BACK_PORCH 23//*/

/*#define HORIZ_PIXELS 120
#define HORIZ_FRONT_PORCH 25
#define HORIZ_SYNC 7
#define HORIZ_BACK_PORCH 5

#define VERT_PIXELS 480
#define VERT_FRONT_PORCH 10
#define VERT_SYNC 2
#define VERT_BACK_PORCH 18//*/

// DO NOT CHANGE BELOW
// this calculates values to give to the uPD7220D.

#define HORIZ_WORDS (HORIZ_PIXELS>>2)

#define MEMORY_SIZE HORIZ_WORDS*VERT_PIXELS

extern void write(byte adr, byte data);

void setup_video(){
  write(1, 0);  // reset
  
  write(0, 0x10); // operation mode

  write(0, HORIZ_WORDS - 2); // uPD needs 2 subtracted.
  write(0, (VERT_SYNC<<5)|(HORIZ_SYNC-1));
  write(0, ((HORIZ_FRONT_PORCH-1)<<2)|(VERT_SYNC>>3));
  write(0, (HORIZ_BACK_PORCH-1)&63);
  write(0, VERT_FRONT_PORCH&63);
  write(0, VERT_PIXELS&255);
  write(0, (VERT_BACK_PORCH<<2)|(VERT_PIXELS>>8));
  
  write(1, 0x6f); // set master video mode
  
  // set pitch
  write(1, 0x47);
  write(0, HORIZ_WORDS);
  
  // set some PRAM values
  write(1, 0x70);
  write(0, 0x00);
  write(0, 0x00);
  write(0, (VERT_PIXELS<<4)&255);
  write(0, VERT_PIXELS>>4);//*/
  
  write(1, 0x4B); // CCHAR
  write(0, 0x00);
  write(0, 0xC0);

  // set zoom
  write(1,0x46);
  write(0,0x00);

  Serial.println("Starting...");
  write(1, 0x6b); // start
  write(1, 0x0D);
}