mirror of https://github.com/cc65/cc65.git
116 lines
2.9 KiB
ArmAsm
116 lines
2.9 KiB
ArmAsm
;
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; Telestrat joystick driver
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;
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; 2002-12-20, Based on Ullrich von Bassewitz's code.
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; 2017-11-01, Stefan Haubenthal
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; 2020-05-20, Jede
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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 "telestrat.inc"
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.macpack module
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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module_header _telestrat_joy
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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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; 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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.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 #%11000000
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sta VIA2::DDRB
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sta VIA2::PRB
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; We could detect joysticks because with previous command bit0,1,2,3,4 should be set to 1 after
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; But if some one press fire or press direction, we could reach others values which could break joystick detection.
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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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; How telestrat joysticks works
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; PB7 and PB6 select right or left port
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; When PB7 and PB6 are high, it controls two CA3083 (2 NPN transistors array) bases.
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; In that case, PB0 to PB4 are set to high (it means no action are pressed)
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; When the user press something then bit will be set to 0.
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; Bit 0 is right
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; Bit 1 is left
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; Bit 2 is fire
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; ...
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READ:
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beq right
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lda VIA2::PRB
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and #%01111111
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ora #%01000000
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sta VIA2::PRB
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; then read
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lda VIA2::PRB
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eor #%01011111
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rts
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right:
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lda VIA2::PRB
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and #%10111111
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ora #%10000000
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sta VIA2::PRB
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; then read
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lda VIA2::PRB
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eor #%10011111
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rts
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