mirror of https://github.com/cc65/cc65.git
144 lines
3.0 KiB
ArmAsm
144 lines
3.0 KiB
ArmAsm
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; Standard joystick driver for the PCEngine
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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 "pce.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 _pce_stdjoy_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 READJOY
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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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.bss
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padbuffer: .res JOY_COUNT
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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 a 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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; DEINSTALL 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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;unsigned char __fastcall__ joy_count (void);
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COUNT:
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lda #<JOY_COUNT
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clx ; 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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;unsigned char __fastcall__ joy_read (unsigned char joystick);
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READJOY:
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pha
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jsr read_joy
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pla
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tax ; Joystick number into X
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; return value from buffer
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joy1:
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lda padbuffer,x
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rts
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read_joy:
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; Reset Multitap counter.
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lda #$01
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sta JOY_CTRL
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pha
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pla
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nop
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nop
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lda #$03
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sta JOY_CTRL
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pha
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pla
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nop
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nop
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cly
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nextpad:
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lda #$01
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sta JOY_CTRL ; sel = 1
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pha
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pla
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nop ; some delay is required
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nop
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lda JOY_CTRL
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asl a
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asl a
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asl a
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asl a
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sta padbuffer,y ; store new value
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stz JOY_CTRL
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pha
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pla
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nop ; some delay is required
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nop
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lda JOY_CTRL
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and #$0F
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ora padbuffer,y ; second half of new value
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eor #$FF
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sta padbuffer,y ; store new value
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iny
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cpy #.sizeof(padbuffer)
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bcc nextpad
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rts
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