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adjust z80 timing a bit

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This commit is contained in:
notaz 2017-10-04 02:23:27 +03:00
parent ebd70cb5d9
commit 3162a7104c
4 changed files with 32 additions and 33 deletions
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21
pico/pico.c
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@ -23,6 +23,8 @@ int PicoAutoRgnOrder;
struct PicoSRAM SRam;
int emustatus; // rapid_ym2612, multi_ym_updates
struct PicoTiming timing;
void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware
void (*PicoResetHook)(void) = NULL;
void (*PicoLineHook)(void) = NULL;
@ -278,31 +280,24 @@ PICO_INTERNAL int CheckDMA(void)
#include "pico_cmn.c"
unsigned int last_z80_sync; /* in 68k cycles */
int z80_cycle_cnt;
int z80_cycle_aim;
int z80_scanline;
int z80_scanline_cycles; /* cycles done until z80_scanline */
/* sync z80 to 68k */
PICO_INTERNAL void PicoSyncZ80(unsigned int m68k_cycles_done)
{
int m68k_cnt;
int cnt;
m68k_cnt = m68k_cycles_done - last_z80_sync;
z80_cycle_aim += cycles_68k_to_z80(m68k_cnt);
cnt = z80_cycle_aim - z80_cycle_cnt;
last_z80_sync = m68k_cycles_done;
m68k_cnt = m68k_cycles_done - timing.m68c_frame_start;
timing.z80c_aim = cycles_68k_to_z80(m68k_cnt);
cnt = timing.z80c_aim - timing.z80c_cnt;
pprof_start(z80);
elprintf(EL_BUSREQ, "z80 sync %i (%u|%u -> %u|%u)", cnt,
z80_cycle_cnt, z80_cycle_cnt / 228,
z80_cycle_aim, z80_cycle_aim / 228);
timing.z80c_cnt, timing.z80c_cnt * 15 / 7 / 488,
timing.z80c_aim, timing.z80c_aim * 15 / 7 / 488);
if (cnt > 0)
z80_cycle_cnt += z80_run(cnt);
timing.z80c_cnt += z80_run(cnt);
pprof_end(z80);
}