#53 Reduce interrupts to 128

sw/kernel/devices/interrupt_controller.s

@@ -34,7 +34,7 @@ IRQ_CMD_EOI     = $ff
 
 cmd_all:        ; Send the same value to all 32 bytes
     txa
-    add #$20
+    add #$10
     sta tmp1
 loop:
     txa
@@ -51,12 +51,10 @@ loop:
 ; void enable_irq(uint8_t type, uint8_t irqnum);
 ; in A: 
 .proc _enable_irq
-    ; Decide which byte we need to modify by dividing by 32 (>> 5)
+    ; Decide which byte we need to modify by dividing by 8 (>> 3)
     pha
     lsr
     lsr
-    lsr
-    lsr
     lsr         ; A is now bytesel
     sta tmp2    ; tmp2 is now bytesel
     add #IRQ_CMD_ENABLE
@@ -97,13 +95,12 @@ L3: sta IRQ_DAT_ADDR
 
 .endproc
 
+; TODO this is mostly the same as enable, why copy?
 .proc _disable_irq
     ; Decide which byte we need to modify by dividing by 32 (>> 5)
     pha
     lsr
     lsr
-    lsr
-    lsr
     lsr         ; A is now bytesel
     add #IRQ_CMD_ENABLE
     sta IRQ_CMD_ADDR

sw/test_code/irq_test/main.s

@@ -54,7 +54,7 @@ _init:
 
 cmd_all:
     txa
-    add #$20
+    add #$10
     sta tmp1
 loop:
     txa