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timer adjustments based on Nem's new info

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@513 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-07-02 11:40:19 +00:00
parent 411cba9099
commit 48dc74f20a
3 changed files with 16 additions and 19 deletions
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23
Pico/Memory.c
View file

@ -700,7 +700,7 @@ static int get_scanline(int is_from_z80)
return Pico.m.scanline;
}
/* probably not should be in this file, but it's near related code here */
/* probably should not be in this file, but it's near related code here */
void ym2612_sync_timers(int z80_cycles, int mode_old, int mode_new)
{
int xcycles = z80_cycles << 8;
@ -719,12 +719,10 @@ void ym2612_sync_timers(int z80_cycles, int mode_old, int mode_new)
if ((mode_old ^ mode_new) & 1) // turning on/off
{
if (mode_old & 1) {
timer_a_offset = timer_a_next_oflow - xcycles;
if (mode_old & 1)
timer_a_next_oflow = TIMER_NO_OFLOW;
}
else
timer_a_next_oflow = xcycles + timer_a_offset;
timer_a_next_oflow = xcycles + timer_a_step;
}
if (mode_new & 1)
elprintf(EL_YMTIMER, "timer a upd to %i @ %i", timer_a_next_oflow>>8, z80_cycles);
@ -736,12 +734,10 @@ void ym2612_sync_timers(int z80_cycles, int mode_old, int mode_new)
if ((mode_old ^ mode_new) & 2)
{
if (mode_old & 2) {
timer_b_offset = timer_b_next_oflow - xcycles;
if (mode_old & 2)
timer_b_next_oflow = TIMER_NO_OFLOW;
}
else
timer_b_next_oflow = xcycles + timer_b_offset;
timer_b_next_oflow = xcycles + timer_b_step;
}
if (mode_new & 2)
elprintf(EL_YMTIMER, "timer b upd to %i @ %i", timer_b_next_oflow>>8, z80_cycles);
@ -792,8 +788,9 @@ int ym2612_write_local(u32 a, u32 d, int is_from_z80)
ym2612.OPN.ST.TA = TAnew;
//ym2612.OPN.ST.TAC = (1024-TAnew)*18;
//ym2612.OPN.ST.TAT = 0;
timer_a_step = timer_a_offset = TIMER_A_TICK_ZCYCLES * (1024 - TAnew);
timer_a_step = TIMER_A_TICK_ZCYCLES * (1024 - TAnew);
if (ym2612.OPN.ST.mode & 1) {
// this is not right, should really be done on overflow only
int cycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone());
timer_a_next_oflow = (cycles << 8) + timer_a_step;
}
@ -807,7 +804,7 @@ int ym2612_write_local(u32 a, u32 d, int is_from_z80)
ym2612.OPN.ST.TB = d;
//ym2612.OPN.ST.TBC = (256-d) * 288;
//ym2612.OPN.ST.TBT = 0;
timer_b_step = timer_b_offset = TIMER_B_TICK_ZCYCLES * (256 - d); // 262800
timer_b_step = TIMER_B_TICK_ZCYCLES * (256 - d); // 262800
if (ym2612.OPN.ST.mode & 2) {
int cycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone());
timer_b_next_oflow = (cycles << 8) + timer_b_step;
@ -966,11 +963,11 @@ void ym2612_unpack_state(void)
tac = (1024 - ym2612.OPN.ST.TA) << 16;
tbc = (256 - ym2612.OPN.ST.TB) << 16;
if (ym2612.OPN.ST.mode & 1)
timer_a_next_oflow = (double)(tac - tat) / (double)tac * timer_a_step;
timer_a_next_oflow = (int)((double)(tac - tat) / (double)tac * timer_a_step);
else
timer_a_next_oflow = TIMER_NO_OFLOW;
if (ym2612.OPN.ST.mode & 2)
timer_b_next_oflow = (double)(tbc - tbt) / (double)tbc * timer_b_step;
timer_b_next_oflow = (int)((double)(tbc - tbt) / (double)tbc * timer_b_step);
else
timer_b_next_oflow = TIMER_NO_OFLOW;
elprintf(EL_YMTIMER, "load: %i/%i, timer_a_next_oflow %i", tat>>16, tac>>16, timer_a_next_oflow >> 8);

8
Pico/PicoInt.h
View file

@ -476,8 +476,8 @@ PICO_INTERNAL void cdda_start_play();
extern short cdda_out_buffer[2*1152];
extern int PsndLen_exc_cnt;
extern int PsndLen_exc_add;
extern int timer_a_next_oflow, timer_a_step, timer_a_offset; // in z80 cycles
extern int timer_b_next_oflow, timer_b_step, timer_b_offset;
extern int timer_a_next_oflow, timer_a_step; // in z80 cycles
extern int timer_b_next_oflow, timer_b_step;
void ym2612_sync_timers(int z80_cycles, int mode_old, int mode_new);
void ym2612_pack_state(void);
@ -498,8 +498,8 @@ void ym2612_unpack_state(void);
#define timers_reset() \
timer_a_next_oflow = timer_b_next_oflow = TIMER_NO_OFLOW; \
timer_a_step = timer_a_offset = TIMER_A_TICK_ZCYCLES * 1024; \
timer_b_step = timer_b_offset = TIMER_B_TICK_ZCYCLES * 256;
timer_a_step = TIMER_A_TICK_ZCYCLES * 1024; \
timer_b_step = TIMER_B_TICK_ZCYCLES * 256;
// VideoPort.c

4
Pico/sound/sound.c
View file

@ -35,8 +35,8 @@ int PsndDacLine=0;
short *PsndOut=NULL; // PCM data buffer
// timers
int timer_a_next_oflow, timer_a_step, timer_a_offset; // in z80 cycles
int timer_b_next_oflow, timer_b_step, timer_b_offset;
int timer_a_next_oflow, timer_a_step; // in z80 cycles
int timer_b_next_oflow, timer_b_step;
// sn76496
extern int *sn76496_regs;