emu.c

   1
   2
   3
   4 #include "defs.h"
   5 #include "regs.h"
   6 #include "hw.h"
   7 #include "cpu.h"
   8 #include "mem.h"
   9 #include "lcd.h"
  10 #include "rc.h"
  11 #include "rtc.h"
  12 #include "sys.h"
  13 #include "sound.h"
  14 #include "cpu.h"
  15
  16
  17 static int framelen = 16743;
  18 static int framecount;
  19 static int paused;
  20
  21 rcvar_t emu_exports[] =
  22 {
  23         RCV_INT("framelen", &framelen, ""),
  24         RCV_INT("framecount", &framecount, ""),
  25         RCV_END
  26 };
  27
  28
  29
  30 void emu_pause(int dopause) {
  31         paused = dopause;
  32 }
  33
  34 int emu_paused(void) {
  35         return paused;
  36 }
  37
  38 void emu_init()
  39 {
  40
  41 }
  42
  43
  44 /*
  45  * emu_reset is called to initialize the state of the emulated
  46  * system. It should set cpu registers, hardware registers, etc. to
  47  * their appropriate values at powerup time.
  48  */
  49
  50 void emu_reset()
  51 {
  52         hw_reset();
  53         lcd_reset();
  54         cpu_reset();
  55         mbc_reset();
  56         sound_reset();
  57         mem_mapbootrom();
  58 }
  59
  60
  61
  62
  63
  64 void emu_step()
  65 {
  66         cpu_emulate(cpu.lcdc);
  67 }
  68
  69
  70
  71 /* This mess needs to be moved to another module; it's just here to
  72  * make things work in the mean time. */
  73
  74 void *sys_timer();
  75
  76 void emu_run()
  77 {
  78         void *timer = sys_timer();
  79         int delay;
  80
  81         vid_begin();
  82         lcd_begin();
  83         for (;;)
  84         {
  85                 cpu_emulate(2280);
  86                 while (R_LY > 0 && R_LY < 144)
  87                         emu_step();
  88
  89                 vid_end();
  90                 rtc_tick();
  91                 sound_mix();
  92                 if (!pcm_submit())
  93                 {
  94                         delay = framelen - sys_elapsed(timer);
  95                         sys_sleep(delay);
  96                         sys_elapsed(timer);
  97                 }
  98                 doevents();
  99                 if (paused) return;
 100                 vid_begin();
 101                 if (framecount) { if (!--framecount) die("finished\n"); }
 102                 if (!(R_LCDC & 0x80))
 103                         cpu_emulate(32832);
 104
 105                 while (R_LY > 0) /* wait for next frame */
 106                         emu_step();
 107         }
 108 }
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