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108 lines
2.4 KiB
ArmAsm
108 lines
2.4 KiB
ArmAsm
;
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; Standard joypad driver for the NES. May be used multiple times when
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; linked to the statically application.
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;
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; Ullrich von Bassewitz, 2003-05-02
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; Stefan Haubenthal, 2004-10-05
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;
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.include "zeropage.inc"
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.include "joy-kernel.inc"
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.include "joy-error.inc"
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.include "nes.inc"
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.segment "JUMPTABLE"
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; Driver signature
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.byte $6A, $6F, $79 ; "joy"
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.byte JOY_API_VERSION ; Driver API version number
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; Button state masks (8 values)
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.byte $10 ; JOY_UP
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.byte $20 ; JOY_DOWN
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.byte $40 ; JOY_LEFT
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.byte $80 ; JOY_RIGHT
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.byte $01 ; JOY_FIRE (A)
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.byte $02 ; JOY_FIRE2 (B)
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.byte $04 ; (Select)
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.byte $08 ; (Start)
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; Jump table.
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.addr INSTALL
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.addr UNINSTALL
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.addr COUNT
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.addr READJOY
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.addr 0 ; IRQ entry unused
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; ------------------------------------------------------------------------
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; Constants
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JOY_COUNT = 2 ; Number of joysticks we support
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an JOY_ERR_xx code in a/x.
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;
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INSTALL:
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lda #JOY_ERR_OK
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ldx #0
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; rts ; Run into UNINSTALL instead
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; ------------------------------------------------------------------------
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; UNINSTALL routine. Is called before the driver is removed from memory.
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; Can do cleanup or whatever. Must not return anything.
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;
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UNINSTALL:
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rts
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; ------------------------------------------------------------------------
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; COUNT: Return the total number of available joysticks in a/x.
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;
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COUNT:
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lda #JOY_COUNT
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ldx #0
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rts
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; ------------------------------------------------------------------------
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; READ: Read a particular joystick passed in A.
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;
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READJOY:
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and #$01 ; Fix joystick number
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tay ; Joystick number (0,1) into Y
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lda #1
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sta APU_PAD1,y
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lda #0
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sta APU_PAD1,y
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; Read joystick
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ldx #8
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@Loop: lda APU_PAD1,y
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ror a
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ror tmp1
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dex
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bne @Loop
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lda tmp1
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; ldx #$00 ; X implicitly fixed
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rts
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