diff options
Diffstat (limited to 'engine/joypad.asm')
| -rw-r--r-- | engine/joypad.asm | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/engine/joypad.asm b/engine/joypad.asm index 87f92635..d50eea08 100644 --- a/engine/joypad.asm +++ b/engine/joypad.asm @@ -1,12 +1,46 @@ +ReadJoypad_:: +; Poll joypad input. +; Unlike the hardware register, button +; presses are indicated by a set bit. + ldh a, [hDisableJoypadPolling] + and a + ret nz + + ld a, 1 << 5 ; select direction keys + + ldh [rJOYP], a + ldh a, [rJOYP] + ldh a, [rJOYP] + cpl + and %1111 + swap a + ld b, a + + ld a, 1 << 4 ; select button keys + ldh [rJOYP], a +REPT 6 + ldh a, [rJOYP] +ENDR + cpl + and %1111 + or b + + ldh [hJoyInput], a + + ld a, 1 << 4 + 1 << 5 ; deselect keys + ldh [rJOYP], a + ret + _Joypad:: ; hJoyReleased: (hJoyLast ^ hJoyInput) & hJoyLast ; hJoyPressed: (hJoyLast ^ hJoyInput) & hJoyInput ldh a, [hJoyInput] + ld b, a + and A_BUTTON + B_BUTTON + SELECT + START + D_UP cp A_BUTTON + B_BUTTON + SELECT + START ; soft reset jp z, TrySoftReset - ld b, a ldh a, [hJoyLast] ld e, a xor b |