git.mutantstargoat.com Git - gbajam22/blob - src/gba/input.c

   1 #include "input.h"
   2 #include "gbaregs.h"
   3 #include "intr.h"
   4
   5 static void keyintr(void);
   6
   7 static uint16_t bnstate;
   8
   9 void select_input(uint16_t bmask)
  10 {
  11         bnstate = 0;
  12
  13         mask(INTR_KEY);
  14         if(bmask) {
  15                 REG_KEYCNT = bmask | KEYCNT_IE;
  16                 interrupt(INTR_KEY, keyintr);
  17                 unmask(INTR_KEY);
  18         } else {
  19                 REG_KEYCNT = 0;
  20                 interrupt(INTR_KEY, 0);
  21         }
  22 }
  23
  24 uint16_t get_input(void)
  25 {
  26         uint16_t s;
  27
  28         mask(INTR_KEY);
  29         s = bnstate;
  30         bnstate = 0;
  31         unmask(INTR_KEY);
  32
  33         return s;
  34 }
  35
  36 static void keyintr(void)
  37 {
  38         bnstate |= ~REG_KEYINPUT;
  39 }