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main.c
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main.c
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/*
* SEGA CD Mode 1 PCM Player
* by Victor Luchits
* and Chilly Willy
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "hw_md.h"
#include "scd_pcm.h"
#define WHITE_TEXT 0x0000
#define GREEN_TEXT 0x2000
#define RED_TEXT 0x4000
extern uint32_t vblank_vector;
extern uint32_t gen_lvl2;
extern uint32_t Sub_Start;
extern uint32_t Sub_End;
extern volatile uint32_t gTicks; /* incremented every vblank */
extern void Kos_Decomp(uint8_t *src, uint8_t *dst);
extern uint8_t stereo_test_u8_wav;
extern int stereo_test_u8_wav_len;
extern uint8_t macabre_ima_wav;
extern int macabre_ima_wav_len;
extern uint8_t macabre_sb4_wav;
extern int macabre_sb4_wav_len;
int main(void)
{
uint16_t buttons = 0, previous = 0;
uint8_t *bios;
char text[44];
uint8_t last_src = 0;
int16_t pan = 128, vol = 255;
uint8_t src_paused[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
clear_screen();
/*
* Check for CD BIOS
* When a cart is inserted in the MD, the CD hardware is mapped to
* 0x400000 instead of 0x000000. So the BIOS ROM is at 0x400000, the
* Program RAM bank is at 0x420000, and the Word RAM is at 0x600000.
*/
bios = (uint8_t *)0x415800;
if (memcmp(bios + 0x6D, "SEGA", 4))
{
bios = (uint8_t *)0x416000;
if (memcmp(bios + 0x6D, "SEGA", 4))
{
// check for WonderMega/X'Eye
if (memcmp(bios + 0x6D, "WONDER", 6))
{
bios = (uint8_t *)0x41AD00; // might also be 0x40D500
// check for LaserActive
if (memcmp(bios + 0x6D, "SEGA", 4))
{
put_str("No CD detected!", RED_TEXT, 20-7, 12);
while (1) ;
}
}
}
}
sprintf(text, "CD Sub-CPU BIOS detected at 0x%6X", (uint32_t)bios);
put_str(text, GREEN_TEXT, 2, 2);
/*
* Reset the Gate Array - this specific sequence of writes is recognized by
* the gate array as a reset sequence, clearing the entire internal state -
* this is needed for the LaserActive
*/
write_word(0xA12002, 0xFF00);
write_byte(0xA12001, 0x03);
write_byte(0xA12001, 0x02);
write_byte(0xA12001, 0x00);
/*
* Reset the Sub-CPU, request the bus
*/
write_byte(0xA12001, 0x02);
while (!(read_byte(0xA12001) & 2)) write_byte(0xA12001, 0x02); // wait on bus acknowledge
/*
* Decompress Sub-CPU BIOS to Program RAM at 0x00000
*/
put_str("Decompressing Sub-CPU BIOS", GREEN_TEXT, 2, 3);
write_word(0xA12002, 0x0002); // no write-protection, bank 0, 2M mode, Word RAM assigned to Sub-CPU
memset((void *)0x420000, 0, 0x20000); // clear program ram first bank - needed for the LaserActive
Kos_Decomp(bios, (uint8_t *)0x420000);
/*
* Copy Sub-CPU program to Program RAM at 0x06000
*/
put_str("Copying Sub-CPU Program", GREEN_TEXT, 2, 4);
memcpy((void *)0x426000, &Sub_Start, (int)&Sub_End - (int)&Sub_Start);
if (memcmp((void *)0x426000, &Sub_Start, (int)&Sub_End - (int)&Sub_Start))
{
sprintf(text, "len %d!", (int)&Sub_End - (int)&Sub_Start);
put_str("Failed writing Program RAM!", RED_TEXT, 20-13, 12);
put_str(text, RED_TEXT, 20-13, 13);
while (1) ;
}
write_byte(0xA1200E, 0x00); // clear main comm port
write_byte(0xA12002, 0x2A); // write-protect up to 0x05400
write_byte(0xA12001, 0x01); // clear bus request, deassert reset - allow CD Sub-CPU to run
while (!(read_byte(0xA12001) & 1)) write_byte(0xA12001, 0x01); // wait on Sub-CPU running
put_str("Sub-CPU started", GREEN_TEXT, 2, 5);
/*
* Set the vertical blank handler to generate Sub-CPU level 2 ints.
* The Sub-CPU BIOS needs these in order to run.
*/
write_long((uint32_t)&vblank_vector, (uint32_t)&gen_lvl2);
set_sr(0x2000); // enable interrupts
/*
* Wait for Sub-CPU program to set sub comm port indicating it is running -
* note that unless there's something wrong with the hardware, a timeout isn't
* needed... just loop until the Sub-CPU program responds, but 2000000 is about
* ten times what the LaserActive needs, and the LA is the slowest unit to
* initialize
*/
while (read_byte(0xA1200F) != 'I')
{
static int timeout = 0;
timeout++;
if (timeout > 2000000)
{
put_str("CD failed to start!", RED_TEXT, 20-9, 12);
while (1) ;
}
}
/*
* Wait for Sub-CPU to indicate it is ready to receive commands
*/
while (read_byte(0xA1200F) != 0x00) ;
put_str("CD initialized and ready to go!", WHITE_TEXT, 20-15, 12);
/*
* Initialize the PCM driver
*/
scd_init_pcm();
put_str("Uploading samples...", WHITE_TEXT, 20-15, 13);
/*
* Upload test samples
*/
scd_upload_buf(1, &macabre_ima_wav, macabre_ima_wav_len);
scd_upload_buf(2, &macabre_sb4_wav, macabre_sb4_wav_len);
scd_upload_buf(3, &stereo_test_u8_wav, stereo_test_u8_wav_len);
clear_screen();
put_str("Mode 1 PCM Player", WHITE_TEXT, 20-8, 2);
put_str("Sample A: IMA ADPCM Mono", WHITE_TEXT, 2, 16);
put_str("Sample B: SB4 ADPCM Mono", WHITE_TEXT, 2, 17);
put_str("Sample C: 8bit PCM Stereo", WHITE_TEXT, 2, 18);
put_str("START = Pause last source", WHITE_TEXT, 2, 20);
put_str("A/B/C = Play Smpl A/B/C on src 1/2/3", WHITE_TEXT, 2, 21);
put_str("X/Y/Z = Play Smpl A/B/C on free src", WHITE_TEXT, 2, 22);
put_str("L/R = pan left/right", WHITE_TEXT, 2, 23);
put_str("U/D = volume incr/decr", WHITE_TEXT, 2, 24);
put_str("MODE = clear", WHITE_TEXT, 2, 25);
while (1)
{
int new_src = 0;
delay(2);
buttons = get_pad(0) & SEGA_CTRL_BUTTONS;
if (buttons & SEGA_CTRL_LEFT)
pan--;
if (buttons & SEGA_CTRL_RIGHT)
pan++;
if (pan < 0)
pan = 0;
if (pan > 255)
pan = 255;
if (buttons & SEGA_CTRL_DOWN)
vol--;
if (buttons & SEGA_CTRL_UP)
vol++;
if (vol < 0)
vol = 0;
if (vol > 255)
vol = 255;
if (((buttons ^ previous) & SEGA_CTRL_A) && (buttons & SEGA_CTRL_A))
{
last_src = scd_play_src(1, 1, 0, pan, vol, 0);
src_paused[last_src] = 0;
}
if (((buttons ^ previous) & SEGA_CTRL_B) && (buttons & SEGA_CTRL_B))
{
last_src = scd_play_src(2, 2, 0, pan, vol, 0);
src_paused[last_src] = 0;
}
if (((buttons ^ previous) & SEGA_CTRL_C) && (buttons & SEGA_CTRL_C))
{
last_src = scd_play_src(3, 3, 0, pan, vol, 0);
src_paused[last_src] = 0;
}
if (((buttons ^ previous) & SEGA_CTRL_X) && (buttons & SEGA_CTRL_X))
{
new_src = scd_play_src(255, 1, 0, pan, vol, 0);
}
if (((buttons ^ previous) & SEGA_CTRL_Y) && (buttons & SEGA_CTRL_Y))
{
new_src = scd_play_src(255, 2, 0, pan, vol, 0);
}
if (((buttons ^ previous) & SEGA_CTRL_Z) && (buttons & SEGA_CTRL_Z))
{
new_src = scd_play_src(255, 3, 0, pan, vol, 0);
}
if (new_src != 0) {
last_src = new_src;
src_paused[last_src] = 0;
}
if (((buttons ^ previous) & SEGA_CTRL_START) && (buttons & SEGA_CTRL_START))
{
scd_punpause_src(last_src, !src_paused[last_src]);
src_paused[last_src] = !src_paused[last_src];
}
if (((buttons ^ previous) & SEGA_CTRL_MODE) && (buttons & SEGA_CTRL_MODE))
{
scd_clear_pcm();
}
scd_update_src(last_src, 0, pan, vol, 0);
sprintf(text, "%d", last_src);
put_str("Last Source: ", GREEN_TEXT, 2, 6);
put_str(text, WHITE_TEXT, 15, 6);
sprintf(text, "%04X", scd_getpos_for_src(last_src));
put_str("Position: ", GREEN_TEXT, 2, 7);
put_str(text, WHITE_TEXT, 15, 7);
sprintf(text, "%03d", (int)pan);
put_str("Panning: ", GREEN_TEXT, 2, 9);
put_str(text, WHITE_TEXT, 15, 9);
sprintf(text, "%03d", (int)vol);
put_str("Volume: ", GREEN_TEXT, 2, 10);
put_str(text, WHITE_TEXT, 15, 10);
previous = buttons;
}
/*
* Should never reach here due to while condition
*/
clear_screen ();
return 0;
}