sdccでmsx その２

概要

sdccでmsxのpsgを叩いて、音を鳴らして見た。

開発環境

SDCC : ver2.8.1
ruMSX : ver0.41

MakeFile

All : psg.hex psg.rom
psg.hex : psg.o
    sdcc -V -mz80 --no-std-crt0 --code-loc 0x4020 --data-loc 0x8000 -o psg.hex  psg.o
psg.rom : psg.hex
    hex2rom psg.hex psg.rom
psg.o : psg.c
    sdcc -V -mz80 psg.c

サンプルコード

#define WRTPSG      #0x0093
#define CHPUT       #0x00A2
#define CHGET       #0x009F
void setpsg(unsigned char e, unsigned char a);
void wait(int t);
void putchar(char c);
int  getchar();
void main(void)
{
    unsigned int psg[] = {
        0xaa, 0xaa, 0xaa, 0xa0, 0xaa, 0xaa, 0xd6, 0xd6, 0xbe, 0xbe,
        0xd6, 0xbe, 0xaa, 0x10d, 0xe3, 0xaa, 0xaa, 0xaa, 0xa0, 0xaa,
        0xaa, 0xd6, 0xbe, 0xbe, 0xd6, 0xe3, 0xfe, 0x7f, 0x7f, 0x7f,
        0x7f, 0x7f, 0x7f, 0xaa, 0xaa, 0xaa, 0xaa, 0xa0, 0x8f, 0xa0,
        0xaa, 0xaa, 0xa0, 0xaa, 0xaa, 0xd6, 0xd6, 0xbe, 0xbe, 0xd6,
        0xe3, 0xfe, 0x153, 0x153, 0x140, 0x153, 0x153, 0x1ac, 0x1ac,
        0x17d, 0x17d, 0x1ac, 0x17d, 0x153, 0x153, 0x153, 0x140, 0x153,
        0x153, 0x1ac, 0x1ac, 0x17d, 0x17d, 0x1ac, 0x01c5, 0x01fc, 0x7f, 0x7f,
        0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0xaa, 0xaa, 0xaa, 0xa0, 0x8f, 0xa0,
        0xaa, 0xaa, 0xa0, 0xaa, 0xaa, 0xd6, 0xd6, 0xbe, 0xbe, 0xd6, 0xe3,
        0xfe
    };
    unsigned int i, j, e, a;
    i = j = e = a = 0;
    a = 0x07;
    e = 0xfe;
    setpsg(e, a);
    for (i = 0; i < 101; i++)
    {
        e = psg[i] & 0xff;
        a = 0x00;
        setpsg(e, a);
        e = (psg[i] >> 8) & 0xff;
        a = 0x01;
        setpsg(e, a);
        e = 0x05;
        a = 0x08;
        setpsg(e, a);
        wait(98000);
        e = 0x00;
        a = 0x08;
        setpsg(e, a);
        wait(2000);
    }
    putchar(getchar());
}
void setpsg(unsigned char e, unsigned char a)
{
    _asm
    ld      e, 4(ix)
    ld      a, 5(ix)
    call    WRTPSG
    _endasm;
}
void putchar(char c)
{
    _asm
    ld      a, 4(ix)
    call    CHPUT
    _endasm;
}
int getchar()
{
    _asm
    call    CHGET
    ld      l, a
    ld      h, #0
    _endasm;
}
void wait(int t)
{
    while(t--);
}