audio/simplesound/ssound.c

/*---------------------------------------------------------------------------------


    Simple sound demo
    -- alekmaul


---------------------------------------------------------------------------------*/
#include "ssound.h"

//---------------------------------------------------------------------------------
// sound declaration
const u8 dummysound[]={             // no sound, for soundtable, see below
    0x90
};

const u8 dksound[]={                // from Donkey Kong sound item 9
    0x81,0x3d,0x00,0x50,0x11,0x01,  //  tone freq 1833,8Hz swept down - vol 15 (max) - length 80
    0x90                            // end
};

const u8 btsound[]={                // from Burger time sound item 12
    0x00,0x00,0x02,0x05,            // periodic noise - freq 125 Hz - vol 15 (max) - length 5
    0x10                            // end
};

const u8 shsound[]={                // from spy hunter sound item 13
    0x02,0x26,0x1e,0x1d,0x24,       // white noise - freq 874 Hz - vol 13 swept down - length 30
    0x10                            // end
};

const u8 sfsound[]={                // from space fury sound item 4
    0x43,0x97,0x00,0x08,0x11,
        0x2d,0x1f,0x11,             // tone freq 740,8Hz swept down - vol 15 (max) swept down - length 8
    0x10                            // end
/*
*/
};

//---------------------------------------------------------------------------------
// mandatory soundtable declaration
// For some reason the very first entry MUST be SOUNDAREA1.  SOUNDAREA1 is the lowest priority sound effect.  
// I recommend using SOUNDAREA1-SOUNDAREA3 to be music track. SOUNDAREA4-6 to be sound effects. 
const sound_t snd_table[]={
    { dummysound,                       SOUNDAREA1},    // sound entry 1    

    { dksound,                          SOUNDAREA4},    // sound entry 2    
    { btsound,                          SOUNDAREA5},    // sound entry 3    
    { shsound,                          SOUNDAREA6},    // sound entry 4    
    { sfsound,                          SOUNDAREA4},    // sound entry 5    
};

//---------------------------------------------------------------------------------
// The NMI routine. Gets called 50 or 60 times per second 
// nothing to update for Input example
void nmi (void) {
}

//---------------------------------------------------------------------------------
void main (void) {
    // Put sound table and mute all channel
    snd_settable(snd_table);
    snd_stopall();

    // Put screen in text mode 2
    vdp_setmode2txt();
    
    // Put default char in VRAM and duplicate to all areas
    //  as we are going to write to line 10, it is in the second area
    vdp_setdefaultchar(FNTNORMAL);
    vdp_duplicatevram();
    vdp_fillvram(0x2000,0xf1,128*8); // Change color (or we will see nothing)
    vdp_enablescr();
    
    // Wait for nothing :P
    while(1) {
        // Update display with current pad 1 values
        if (joypad_1 & PAD_RIGHT) { vdp_putstring(9,10,"DK SND"); snd_startplay(2); }
        if (joypad_1 & PAD_LEFT)  { vdp_putstring(9,10,"BT SND"); snd_startplay(3); }
        if (joypad_1 & PAD_DOWN)  { vdp_putstring(9,10,"SH SND"); snd_startplay(4); }
        if (joypad_1 & PAD_UP)    { vdp_putstring(9,10,"SF SND"); snd_startplay(5); }

        while (joypad_1) vdp_waitvblank(1); // Wait Vblank while joy pressed 
        
        vdp_waitvblank(1); // default wait vblank
    }
    // startup module will issue a soft reboot if it comes here 
}