mirror of https://github.com/cc65/cc65.git
219 lines
5.1 KiB
ArmAsm
219 lines
5.1 KiB
ArmAsm
;
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; DXS/HIT-4 Player joystick driver for the C64
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;
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; Groepaz/Hitmen, 2002-12-23
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; obviously based on Ullrichs driver :)
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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 "c64.inc"
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.macpack generic
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.macpack module
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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module_header _c64_hitjoy_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 = 4 ; Number of joysticks we support
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; ------------------------------------------------------------------------
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; Data. Written in the IRQ, read by the READ routine
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.bss
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temp3: .byte 0
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temp4: .byte 0
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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: 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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readadapter:
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sei
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; cia 2 setup
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ldy #$00 ; port b direction
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sty $dd03 ; => input
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sty $dd05 ; cia2 timer a highbyte
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sty $dc05 ; cia1 timer a highbyte
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iny
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sty $dd04 ; cia2 timer a lowbyte
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sty $dc04 ; cia1 timer a lowbyte
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lda #%00010001
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sta $dd0e ; control register a
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; timer: start
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; continous
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; forced load
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; serial port: input
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; cia 1 setup
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lda #%01010001
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sta $dc0e ; control register a
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; timer: start
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; continous
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; forced load
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; serial port: output
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; read directions 3
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lda $dd01 ;read cia 2 port b
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and #$0f
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sta temp3
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; read button 3
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lda $dd02 ;cia 2 port a
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and #%11111011 ;data direction
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sta $dd02 ;=> bit 2 input
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lda $dd00 ;read cia 2 p.A
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and #%00000100 ;check bit 2
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asl a
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asl a
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ora temp3
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sta temp3
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; read directions 4
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lda $dd01 ;read cia 2 port b
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lsr a
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lsr a
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lsr a
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lsr a
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sta temp4
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; read button 4
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ldx #$ff ;serial data register
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stx $dc0c ;=> writing $ff causes
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;cia to output some
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;count signals at cnt1
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ldx $dd0c ;read cia 2 serial in
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beq fire ;button press if zero
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lda temp4
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ora #%00010000
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sta temp4
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fire:
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; FIXME: to be really 100% correct this should restore the correct timer
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; values for the respective machine (PAL: $4025, NTSC: $4295)
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; however, this should hardly be a problem in a real world program
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lda #$41
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sta $dc05
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lda #0
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sta $dc04
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cli
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rts
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READ:
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pha
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jsr readadapter
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pla
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tax ; Joystick number into X
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bne joy2
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; Read joystick 1
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joy1: lda #$7F
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sei
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sta CIA1_PRA
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lda CIA1_PRB
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cli
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and #$1F
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eor #$1F
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rts
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; Read joystick 2
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joy2: dex
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bne joy3
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; ldx #0
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lda #$E0
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ldy #$FF
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sei
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sta CIA1_DDRA
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lda CIA1_PRA
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sty CIA1_DDRA
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cli
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and #$1F
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eor #$1F
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rts
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; Read joystick 3
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joy3: dex
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bne joy4
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lda temp3
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eor #$1F
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rts
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; Read joystick 4
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joy4: lda temp4
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eor #$1F
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ldx #0
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rts
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