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https://github.com/cc65/cc65.git
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1976d6cd32
All but one joystick drivers didn't use IRQs. Espsecially when the joystick driver kernel was the only .interruptor this meant quite some unnecessary overhead because it pulled in the whole IRQ infrastructure. I was told that the one driver using IRQs (the DXS/HIT-4 Player joystick driver for the C64) can be reworked to not do it. Until this is done that driver is defunct.
148 lines
3.0 KiB
ArmAsm
148 lines
3.0 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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; ------------------------------------------------------------------------
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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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