add a standard joystick driver, adapted from the c64 one

libsrc/mega65/joy/m65-stdjoy.s

@@ -0,0 +1,111 @@
+;
+; Standard joystick driver for the C64. May be used multiple times when linked
+; to the statically application.
+;
+; Ullrich von Bassewitz, 2002-12-20
+;
+
+        .include        "zeropage.inc"
+
+        .include        "joy-kernel.inc"
+        .include        "joy-error.inc"
+        .include        "mega65.inc"
+
+        .macpack        generic
+        .macpack        module
+
+
+; ------------------------------------------------------------------------
+; Header. Includes jump table
+
+        module_header   _mega65_stdjoy_joy
+
+; Driver signature
+
+        .byte   $6A, $6F, $79           ; "joy"
+        .byte   JOY_API_VERSION         ; Driver API version number
+
+; Library reference
+
+        .addr   $0000
+
+; Jump table.
+
+        .addr   INSTALL
+        .addr   UNINSTALL
+        .addr   COUNT
+        .addr   READ
+
+; ------------------------------------------------------------------------
+; Constants
+
+JOY_COUNT       = 2             ; Number of joysticks we support
+
+
+; ------------------------------------------------------------------------
+; Data.
+
+
+.code
+
+; ------------------------------------------------------------------------
+; INSTALL routine. Is called after the driver is loaded into memory. If
+; possible, check if the hardware is present and determine the amount of
+; memory available.
+; Must return an JOY_ERR_xx code in a/x.
+;
+
+INSTALL:
+        lda     #JOY_ERR_OK
+        .assert JOY_ERR_OK = 0, error
+        tax
+
+;       rts                     ; Run into UNINSTALL instead
+
+; ------------------------------------------------------------------------
+; UNINSTALL routine. Is called before the driver is removed from memory.
+; Can do cleanup or whatever. Must not return anything.
+;
+
+UNINSTALL:
+        rts
+
+
+; ------------------------------------------------------------------------
+; COUNT: Return the total number of available joysticks in a/x.
+;
+
+COUNT:
+        lda     #<JOY_COUNT
+        ldx     #>JOY_COUNT
+        rts
+
+; ------------------------------------------------------------------------
+; READ: Read a particular joystick passed in A.
+;
+
+READ:   tax                     ; Joystick number into X
+        bne     joy2
+
+; Read joystick 1
+
+joy1:   lda     #$7F
+        sei
+        sta     CIA1_PRA
+        lda     CIA1_PRB
+        cli
+        jmp     end
+
+; Read joystick 2
+
+joy2:   ldx     #0
+        lda     #$E0
+        ldy     #$FF
+        sei
+        sta     CIA1_DDRA
+        lda     CIA1_PRA
+        sty     CIA1_DDRA
+        cli
+end:    and     #$1F
+        eor     #$1F
+        rts

libsrc/mega65/joy_stat_stddrv.s

@@ -0,0 +1,14 @@
+;
+; Address of the static standard joystick driver
+;
+; Oliver Schmidt, 2012-11-01
+;
+; const void joy_static_stddrv[];
+;
+
+        .export _joy_static_stddrv
+        .import _mega65_stdjoy_joy
+
+.rodata
+
+_joy_static_stddrv := _mega65_stdjoy_joy

libsrc/mega65/joy_stddrv.s

@@ -0,0 +1,14 @@
+;
+; Name of the standard joystick driver
+;
+; Ullrich von Bassewitz, 2002-12-21
+;
+; const char joy_stddrv[];
+;
+
+        .export _joy_stddrv
+
+.rodata
+
+_joy_stddrv:    .asciiz "m65-stdjoy.joy"
+

libsrc/mega65/libref.s

@@ -0,0 +1,8 @@
+;
+; Oliver Schmidt, 2013-05-31
+;
+
+        .export         joy_libref
+        .import         _exit
+
+joy_libref      := _exit