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7f52a770d9
So far the joy_masks array allowed several joystick drivers for a single target to each have different joy_read return values. However this meant that every call to joy_read implied an additional joy_masks lookup to post-process the return value. Given that almost all targets only come with a single joystick driver this seems an inappropriate overhead. Therefore now the target header files contain constants matching the return value of the joy_read of the joystick driver(s) on that target. If there indeed are several joystick drivers for a single target they must agree on a common return value for joy_read. In some cases this was alredy the case as there's a "natural" return value for joy_read. However a few joystick drivers need to be adjusted. This may cause some overhead inside the driver. But that is for sure smaller than the overhead introduced by the joy_masks lookup before. !!! ToDo !!! The following three joystick drivers become broken with this commit and need to be adjusted: - atrmj8.s - c64-numpad.s - vic20-stdjoy.s
149 lines
3.1 KiB
ArmAsm
149 lines
3.1 KiB
ArmAsm
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;
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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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.addr 0 ; IRQ entry unused
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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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.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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ldx #>JOY_ERR_OK
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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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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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ldx #0
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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 #$05
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bcc nextpad
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rts
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.bss
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padbuffer:
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.res 4
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