emu.c

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   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
  20 rcvar_t emu_exports[] =
  21 {
  22         RCV_INT("framelen", &framelen),
  23         RCV_INT("framecount", &framecount),
  24         RCV_END
  25 };
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  33 void emu_init()
  34 {
  35
  36 }
  37
  38
  39 /*
  40  * emu_reset is called to initialize the state of the emulated
  41  * system. It should set cpu registers, hardware registers, etc. to
  42  * their appropriate values at powerup time.
  43  */
  44
  45 void emu_reset()
  46 {
  47         hw_reset();
  48         lcd_reset();
  49         cpu_reset();
  50         mbc_reset();
  51         sound_reset();
  52 }
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  54
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  56
  57
  58 void emu_step()
  59 {
  60         cpu_emulate(cpu.lcdc);
  61 }
  62
  63
  64
  65 /* This mess needs to be moved to another module; it's just here to
  66  * make things work in the mean time. */
  67
  68 void *sys_timer();
  69
  70 void emu_run()
  71 {
  72         void *timer = sys_timer();
  73         int delay;
  74
  75         vid_begin();
  76         lcd_begin();
  77         for (;;)
  78         {
  79                 cpu_emulate(2280);
  80                 while (R_LY > 0 && R_LY < 144)
  81                         emu_step();
  82
  83                 vid_end();
  84                 rtc_tick();
  85                 sound_mix();
  86                 if (!pcm_submit())
  87                 {
  88                         delay = framelen - sys_elapsed(timer);
  89                         sys_sleep(delay);
  90                         sys_elapsed(timer);
  91                 }
  92                 doevents();
  93                 vid_begin();
  94                 if (framecount) { if (!--framecount) die("finished\n"); }
  95
  96                 if (!(R_LCDC & 0x80))
  97                         cpu_emulate(32832);
  98
  99                 while (R_LY > 0) /* wait for next frame */
 100                         emu_step();
 101         }
 102 }
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