8bitworkshop/presets/nes/music.c

#include <string.h>
#include <nes.h>

#include "neslib.h"

typedef unsigned char byte;

#pragma data-name (push,"CHARS")

const unsigned char TILESET[8*128] = {/*{w:8,h:8,bpp:1,count:128,brev:1}*/
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};

#pragma data-name(pop)

//
// MUSIC ROUTINES
//

// Namespace(bias=1.0, freq=111860.8, length=64, maxbits=13, upper=49)
// 440.5 1.79281159771 49
const int note_table[64] = {
4304, 4062, 3834, 3619, 3416, 3224, 3043, 2872, 2711, 2559, 2415, 2279, 2151, 2031, 1917, 1809, 1707, 1611, 1521, 1436, 1355, 1279, 1207, 1139, 1075, 1015, 958, 904, 853, 805, 760, 717, 677, 639, 603, 569, 537, 507, 478, 451, 426, 402, 379, 358, 338, 319, 301, 284, 268, 253, 239, 225, 213, 201, 189, 179, 168, 159, 150, 142, 134, 126, 119, 112, };

byte music_index = 0;
byte cur_duration = 0;

const byte music1[] = {
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};

static const byte* music_ptr = music1;

byte next_music_byte() {
  return *music_ptr++;
}

#define DUTY 0x80

void play_music() {
  static byte ch = 0;
  if (music_ptr) {
    while (cur_duration == 0) {
      byte note = next_music_byte();
      if ((note & 0x80) == 0) {
        int period = note_table[note & 63];
        if (ch == 0) {
          APU.pulse[0].period_low = period & 0xff;
          APU.pulse[0].len_period_high = period >> 8;
          APU.pulse[0].control = DUTY | 0xf;
        } else {
          APU.pulse[1].period_low = period & 0xff;
          APU.pulse[1].len_period_high = period >> 8;
          APU.pulse[1].control = DUTY | 0xf;
        }
        ch = ch^1;
      } else {
        if (note == 0xff)
          music_ptr = NULL;
        cur_duration = note & 63;
      }
    }
    cur_duration--;
  }
}

void start_music(const byte* music) {
  music_ptr = music;
  cur_duration = 0;
}

//put a string into the nametable

void put_str(unsigned int adr,const char *str)
{
        vram_adr(adr);
        while(1)
        {
                if(!*str) break;
                vram_put((*str++)-0x20);//-0x20 because ASCII code 0x20 is placed in tile 0 of the CHR
        }
}

const byte APUINIT[0x13] = {
  0x30,0x08,0x00,0x00,
  0x30,0x08,0x00,0x00,
  0x80,0x00,0x00,0x00,
  0x30,0x00,0x00,0x00,
  0x00,0x00,0x00
};

void init_apu() {
  // from https://wiki.nesdev.com/w/index.php/APU_basics
  memcpy((void*)0x4000, APUINIT, sizeof(APUINIT));
  APU.status = 0xf;
  APU.fcontrol = 0x40;
}

void main(void)
{
	//copy tileset to RAM
  	vram_adr(0x0);
	vram_write((unsigned char*)TILESET, sizeof(TILESET));
        pal_col(1,0x30);//set while color
        put_str(NTADR_A(2,2),"HELLO, WORLD!");
        ppu_on_all();//enable rendering

  	init_apu();

  music_ptr = 0;
  while (1) {
    if (!music_ptr) start_music(music1);
    waitvsync();
    play_music();
  }
}