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tried to adjust timers using formulae

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@497 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-06-26 19:32:34 +00:00
parent e4fb433cd6
commit 45a1ef7153
3 changed files with 18 additions and 4 deletions
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4
Pico/Memory.c
View file

@ -798,7 +798,7 @@ int ym2612_write_local(u32 a, u32 d, int is_from_z80)
ym2612.OPN.ST.TA = TAnew; ym2612.OPN.ST.TA = TAnew;
//ym2612.OPN.ST.TAC = (1024-TAnew)*18; //ym2612.OPN.ST.TAC = (1024-TAnew)*18;
//ym2612.OPN.ST.TAT = 0; //ym2612.OPN.ST.TAT = 0;
timer_a_step = timer_a_offset = 16466 * (1024 - TAnew); timer_a_step = timer_a_offset = TIMER_A_TICK_ZCYCLES * (1024 - TAnew);
if (ym2612.OPN.ST.mode & 1) { if (ym2612.OPN.ST.mode & 1) {
int cycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone()); int cycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone());
timer_a_next_oflow = (cycles << 8) + timer_a_step; timer_a_next_oflow = (cycles << 8) + timer_a_step;
@ -813,7 +813,7 @@ int ym2612_write_local(u32 a, u32 d, int is_from_z80)
ym2612.OPN.ST.TB = d; ym2612.OPN.ST.TB = d;
//ym2612.OPN.ST.TBC = (256-d) * 288; //ym2612.OPN.ST.TBC = (256-d) * 288;
//ym2612.OPN.ST.TBT = 0; //ym2612.OPN.ST.TBT = 0;
timer_b_step = timer_b_offset = 262800 * (256 - d); // 262881 timer_b_step = timer_b_offset = TIMER_B_TICK_ZCYCLES * (256 - d); // 262800
if (ym2612.OPN.ST.mode & 2) { if (ym2612.OPN.ST.mode & 2) {
int cycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone()); int cycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone());
timer_b_next_oflow = (cycles << 8) + timer_b_step; timer_b_next_oflow = (cycles << 8) + timer_b_step;

8
Pico/PicoInt.h
View file

@ -480,6 +480,10 @@ void ym2612_pack_state(void);
void ym2612_unpack_state(void); void ym2612_unpack_state(void);
#define TIMER_NO_OFLOW 0x70000000 #define TIMER_NO_OFLOW 0x70000000
// tA = 72 * (1024 - NA) / M
#define TIMER_A_TICK_ZCYCLES 17203
// tB = 1152 * (256 - NA) / M
#define TIMER_B_TICK_ZCYCLES 262800 // 275251 broken, see Dai Makaimura
#define timers_cycle() \ #define timers_cycle() \
if (timer_a_next_oflow > 0 && timer_a_next_oflow < TIMER_NO_OFLOW) \ if (timer_a_next_oflow > 0 && timer_a_next_oflow < TIMER_NO_OFLOW) \
@ -490,8 +494,8 @@ void ym2612_unpack_state(void);
#define timers_reset() \ #define timers_reset() \
timer_a_next_oflow = timer_b_next_oflow = TIMER_NO_OFLOW; \ timer_a_next_oflow = timer_b_next_oflow = TIMER_NO_OFLOW; \
timer_a_step = timer_a_offset = 16495 * 1024; \ timer_a_step = timer_a_offset = TIMER_A_TICK_ZCYCLES * 1024; \
timer_b_step = timer_b_offset = 263912 * 256; timer_b_step = timer_b_offset = TIMER_B_TICK_ZCYCLES * 256;
// VideoPort.c // VideoPort.c

10
platform/linux/940ctl_ym2612.c
View file

@ -53,6 +53,16 @@ void YM2612PicoStateLoad_940(void)
} }
} }
void YM2612PicoStateSave2_940(int tat, int tbt)
{
YM2612PicoStateSave2(tat, tbt);
}
int YM2612PicoStateLoad2_940(int *tat, int *tbt)
{
return YM2612PicoStateLoad2(tat, tbt);
}
void sharedmem_init(void) void sharedmem_init(void)
{ {