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