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core, improve 68k timing accuracy

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This commit is contained in:
kub 2023-07-11 21:18:05 +00:00
parent a5aae2c39f
commit 7263343dc7
8 changed files with 76 additions and 63 deletions
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9
pico/pico_int.h
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@ -204,7 +204,7 @@ extern struct DrZ80 drZ80;
#define z80_cyclesDone() \
(Pico.t.z80c_aim - z80_cyclesLeft)
// 68k clock = OSC/7, z80 clock = OSC/15, 68k:z80 ratio = 7/15*8192=3822.9
// 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)
// ----------------------- SH2 CPU -----------------------
@ -443,6 +443,7 @@ struct PicoTiming
unsigned int m68c_aim;
unsigned int m68c_frame_start; // m68k cycles
unsigned int m68c_line_start;
int refresh_delay;
unsigned int z80c_cnt; // z80 cycles done (this frame)
unsigned int z80c_aim;
@ -523,7 +524,7 @@ struct mcd_misc
unsigned int stopwatch_base_c;
unsigned short m68k_poll_a;
unsigned short m68k_poll_cnt;
unsigned short s68k_poll_a;
unsigned short s68k_poll_a; // 10
unsigned short s68k_poll_cnt;
unsigned int s68k_poll_clk;
unsigned char bcram_reg; // 18: battery-backed RAM cart register
@ -640,7 +641,8 @@ struct Pico32x
unsigned char pad1;
unsigned short pwm_p[2]; // pwm pos in fifo
unsigned int pwm_cycle_p; // pwm play cursor (32x cycles)
unsigned int reserved[6];
unsigned int hint_counter;
unsigned int reserved[5];
};
struct Pico32xMem
@ -803,6 +805,7 @@ PICO_INTERNAL void PicoExitMCD(void);
PICO_INTERNAL void PicoPowerMCD(void);
PICO_INTERNAL int PicoResetMCD(void);
PICO_INTERNAL void PicoFrameMCD(void);
PICO_INTERNAL void PicoMCDPrepare(void);
enum pcd_event {
PCD_EVENT_CDC,