Fix joystick driver. Add interruptor support.

Note that the joystick driver doesn't support combined movements (like left/up or right/down). This should be fixed.
2017-02-15 15:45:49 +01:00
parent 6df0ba5244
commit e6530d68dd
6 changed files with 132 additions and 73 deletions
--- a/libsrc/creativision/irq.s
+++ b/libsrc/creativision/irq.s
@@ -0,0 +1,40 @@
+;
+; IRQ handling (CreatiVision version)
+;
+
+        .export         initirq, doneirq
+        .import         callirq, irq2
+
+        .include        "creativision.inc"
+
+; ------------------------------------------------------------------------
+
+.segment        "ONCE"
+
+initirq:
+        lda     #<IRQStub
+        ldx     #>IRQStub
+        jmp     setvec
+
+; ------------------------------------------------------------------------
+
+.code
+
+doneirq:
+        lda     #<BIOS_IRQ2_ADDR
+        ldx     #>BIOS_IRQ2_ADDR
+setvec: sei
+        sta     irq2+1
+        stx     irq2+2
+        cli
+        rts
+
+; ------------------------------------------------------------------------
+
+.segment        "CODE"
+
+IRQStub:
+        cld                             ; Just to be sure
+        jsr     callirq                 ; Call the functions
+        jmp     BIOS_IRQ2_ADDR          ; Jump to the BIOS IRQ vector
+