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98 lines
2.7 KiB
ArmAsm
98 lines
2.7 KiB
ArmAsm
;
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; Standard joystick driver for the CX16.
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; May be installed multiple times when statically linked to an application.
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;
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; 2019-12-24, Greg King
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;
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.include "joy-kernel.inc"
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.include "joy-error.inc"
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.include "cbm_kernal.inc"
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.include "cx16.inc"
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.macpack generic
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.macpack module
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.importzp tmp1
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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module_header _cx16_std_joy
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; Driver signature
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.byte $6A, $6F, $79 ; ASCII "joy"
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.byte JOY_API_VERSION ; Driver API version number
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; Library reference
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.addr $0000
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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 READ
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; ------------------------------------------------------------------------
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; Constant
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JOY_COUNT = 2 ; Number of joysticks we support
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; ------------------------------------------------------------------------
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; Data.
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine -- is called after the driver is loaded into memory.
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; If possible, check if the hardware is present, and determine the amount
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; of memory available.
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; Must return a JOY_ERR_xx code in .XA .
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INSTALL:
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lda #<JOY_ERR_OK
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ldx #>JOY_ERR_OK
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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 clean-up or whatever. Shouldn't return anything.
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UNINSTALL:
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rts
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; ------------------------------------------------------------------------
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; COUNT: Return the total number of possible joysticks, in .XA .
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COUNT: lda #<JOY_COUNT
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ldx #>JOY_COUNT
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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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READ: and #%00000001
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jsr JOYSTICK_GET
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sta tmp1
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txa
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bit #%00001110 ; Is it NES or SNES controller?
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bze nes
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asl tmp1 ; Get SNES's B button
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ror a ; Put it next to the A button
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asl tmp1 ; Drop SNES's Y button
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asl a ; Get back the B button
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ror tmp1
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asl a ; Get SNES's A button
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ror tmp1 ; Make byte look like NES pad
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nes: lda tmp1 ; The controllers give zeroes for "pressed"
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eor #%11111111 ; We want ones for "pressed"
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rts
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