#include "../sound/sound.h"
-static int counter75hz = 0; // TODO: move 2 context
+extern unsigned char formatted_bram[8*0x10];
int PicoInitMCD(void)
int PicoResetMCD(int hard)
{
- // clear everything except BIOS
- memset(Pico_mcd->prg_ram, 0, sizeof(mcd_state) - sizeof(Pico_mcd->bios));
+ memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
+ memset(Pico_mcd->word_ram, 0, sizeof(Pico_mcd->word_ram));
+ memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
+ if (hard) {
+ memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
+ memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - 8*0x10, formatted_bram, 8*0x10);
+ }
+ memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
+ memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
+
*(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
- PicoMCD |= 2; // s68k reset pending. TODO: move
+ Pico_mcd->m.state_flags |= 2; // s68k reset pending
Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
- counter75hz = 0;
+ Pico_mcd->m.counter75hz = 0;
LC89510_Reset();
Reset_CD();
+ gfx_cd_reset();
return 0;
}
Update_CDC_TRansfer(ddx); // now go and do the actual transfer
}
-// to be called on 224 or line_sample scanlines only
-static __inline void getSamples(int y)
+static __inline void update_chips(void)
{
- if(y == 224) {
- //dprintf("sta%i: %i [%i]", (emustatus & 2), emustatus, y);
- if(emustatus & 2)
- sound_render(PsndLen/2, PsndLen-PsndLen/2);
- else sound_render(0, PsndLen);
- if (emustatus&1) emustatus|=2; else emustatus&=~2;
- if (PicoWriteSound) PicoWriteSound();
- // clear sound buffer
- memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));
- }
- else if(emustatus & 3) {
- emustatus|= 2;
- emustatus&=~1;
- sound_render(0, PsndLen/2);
- }
-}
+ int counter_timer, int3_set;
+ int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
+ // 75Hz CDC update
+ if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
+ Pico_mcd->m.counter75hz -= counter75hz_lim;
+ Check_CD_Command();
+ }
+
+ // update timers
+ counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
+ Pico_mcd->m.timer_stopwatch += counter_timer;
+ if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
+ Pico_mcd->m.timer_int3 -= counter_timer;
+ if (Pico_mcd->m.timer_int3 < 0) {
+ if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
+ dprintf("s68k: timer irq 3");
+ SekInterruptS68k(3);
+ Pico_mcd->m.timer_int3 += int3_set << 16;
+ }
+ // is this really what happens if irq3 is masked out?
+ Pico_mcd->m.timer_int3 &= 0xffffff;
+ }
+ }
+
+ // update gfx chip
+ if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
+ gfx_cd_update();
+}
-// Accurate but slower frame which does hints
static int PicoFrameHintsMCD(void)
{
struct PicoVideo *pv=&Pico.video;
- int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample,counter75hz_lim;
+ int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;
const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
int skip=PicoSkipFrame || (PicoOpt&0x10);
int hint; // Hint counter
//cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
line_sample = 68;
- counter75hz_lim = 2080;
if(pv->reg[1]&8) lines_vis = 240;
} else {
//cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
//cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
lines = 262;
- counter75hz_lim = 2096;
line_sample = 93;
}
sound_timers_and_dac(y);
// get samples from sound chips
- if(y == 32 && PsndOut)
- emustatus &= ~1;
- else if((y == 224 || y == line_sample) && PsndOut)
- getSamples(y);
+ if (y == 224 && PsndOut) {
+ int len = sound_render(0, PsndLen);
+ if (PicoWriteSound) PicoWriteSound(len);
+ // clear sound buffer
+ sound_clear();
+ }
// Run scanline:
//dprintf("m68k starting exec @ %06x", SekPc);
total_z80+=z80_run(z80CycleAim-total_z80);
}
- if ((counter75hz+=10) >= counter75hz_lim) {
- counter75hz -= counter75hz_lim;
- Check_CD_Command();
- }
-
- if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
- gfx_cd_update();
+ update_chips();
}
// draw a frame just after vblank in alternative render mode