mirror of https://github.com/cc65/cc65.git
105 lines
2.7 KiB
ArmAsm
105 lines
2.7 KiB
ArmAsm
;
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; Standard joystick driver for the Plus/4 and C16.
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; May be used multiple times when linked statically to an application.
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;
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; 2002-12-21, Ullrich von Bassewitz
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; 2016-06-18, 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 "plus4.inc"
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.macpack module
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.if .xmatch ("MODULE_LABEL", .string(MODULE_LABEL))
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module_header _plus4_stdjoy_joy
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.else
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module_header MODULE_LABEL
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.endif
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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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; Constants
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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. 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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.assert JOY_ERR_OK = 0, error
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tax
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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 #>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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;
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READ: ldy #%11111011 ; Load index for joystick #1
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tax ; Test joystick number
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beq @L1
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ldy #%11111101 ; Load index for joystick #2
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ldx #>$0000 ; (Return unsigned int)
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@L1: sei
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sty TED_KBD ; Read a joystick ...
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lda TED_KBD ; ... and some keys -- it's unavoidable
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cli
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eor #%11111111
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; The push buttons are in bits 6 and 7. Both of them cannot be %1 together.
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; Therefore, bit 6 can be merged with bit 7.
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clc
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adc #%01000000
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rts
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