8bitworkshop/presets/nes/hello.c

/*
A simple "hello world" example.
Set the screen background color and palette colors.
Then write a message to the nametable.
Finally, turn on the PPU to display video.
*/

#include "neslib.h"

// link the pattern table into CHR ROM
//#link "chr_generic.s"

// main function, run after console reset
void main(void) {
  int x;
  // set palette colors
  pal_col(0,0x02);	// set screen to dark blue
  pal_col(1,0x14);	// pink
  pal_col(2,0x20);	// grey
  pal_col(3,0x30);	// white

  // write text to name table
  vram_adr(NTADR_A(2,2));		// set address
  vram_write("HELLO, WORLD!", 13);	// write bytes to video RAM

  // enable PPU rendering (turn on screen)
  ppu_on_all();

  for (x=0; x<500; x++) {
    ppu_wait_frame();
  }
  ppu_off();
  // infinite loop
  while (1) ;
}