RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-07 16:18:04 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

core, revisit ym2612 busy flag implementation

Browse source
This commit is contained in:
kub 2024-06-22 23:12:31 +02:00
parent e948a120ed
commit f5c022a8e4
5 changed files with 24 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

11
pico/pico_int.h
View file

@ -209,6 +209,7 @@ extern struct DrZ80 drZ80;
// 68k clock = OSC/7, z80 clock = OSC/15, 68k:z80 ratio = 7/15 = 3822.9/8192
#define cycles_68k_to_z80(x) ((x) * 3823 >> 13)
#define cycles_z80_to_68k(x) ((x) * 8777 >> 12)
// ----------------------- SH2 CPU -----------------------
@ -898,10 +899,12 @@ void ym2612_unpack_state(void);
#define TIMER_NO_OFLOW 0x70000000
// tA = 72 * (1024 - TA) / M, with M = mclock/2
#define TIMER_A_TICK_ZCYCLES cycles_68k_to_z80(256LL* 72*2) // Q8
// tB = 16*72 * ( 256 - TB) / M
#define TIMER_B_TICK_ZCYCLES cycles_68k_to_z80(256LL*16*72*2) // Q8
// tA = 24*3 * (1024 - TA) / M, with M = mclock/2
#define TIMER_A_TICK_ZCYCLES cycles_68k_to_z80(256LL* 24*3*2) // Q8
// tB = 16*24*3 * ( 256 - TB) / M
#define TIMER_B_TICK_ZCYCLES cycles_68k_to_z80(256LL*16*24*3*2) // Q8
// busy = 32*3 / M
#define YMBUSY_ZCYCLES cycles_68k_to_z80(256LL* 32*3*2) // Q8
#define timers_cycle(ticks) \
if (Pico.t.ym2612_busy > 0) \