avr: work on simple GUI module to be used by node c02.

avr/modules/com2w/com2w.asm

@@ -46,6 +46,30 @@
 
 
 
+.macro M_COM2WSETUPINT0
+  inr r16, MCUCR
+  cbr r16, (1<<ISC01) | (1<<ISC00)
+  sbr r16, (1<<ISC01) | (0<<ISC00)        ; falling edge of ATTN
+  outr MCUCR, r16
+;  sbr r16, (0<<ISC01) | (0<<ISC00)         ; low level triggers
+  inr r16, COM_IRQ_ADDR_CLK               ; enable irq for ATTN line
+  sbr r16, (1<<COM_IRQ_BIT_CLK)
+  outr COM_IRQ_ADDR_CLK, r16
+.endmacro
+
+
+
+.macro M_COM2WSETUPPCI
+  sbi COM_IRQ_ADDR_CLK, COM_IRQ_BIT_CLK   ; enable pin change irq for CLK line
+  in r16, GIMSK                           ; enable pin change irq PCIE0 or PCIE1
+  ori r16, (1<<COM_IRQ_GIMSK_CLK)
+  out GIMSK, R16
+  ldi r16, (1<<COM_IRQ_GIFR_CLK)          ; clear pending irq by writing 1 to CLK bit
+  out GIFR, r16
+.endmacro
+
+
+
 
 
 .dseg
@@ -91,6 +115,19 @@ COM2W_Init:
   ; setup pin-change interrupt for CLK
   rcall com2wEnableClkIrq
 
+  ; enable IRQ
+.ifdef INT0
+  .if COM_IRQ_BIT_CLK == INT0
+    M_COM2WSETUPINT0
+  .else
+    M_COM2WSETUPPCI
+  .endif
+.else
+  M_COM2WSETUPPCI
+.endif
+
+
+#if 0
   inr r16, COM_IRQ_ADDR_CLK
   sbr r16, (1<<COM_IRQ_BIT_CLK)           ; enable pin change irq for ATTN line
   outr COM_IRQ_ADDR_CLK, r16
@@ -100,6 +137,7 @@ COM2W_Init:
   outr GIMSK, r16
   ldi r16, (1<<COM_IRQ_GIFR_CLK)          ; clear pending irq by writing 1 to ATTN bit
   outr GIFR, r16
+#endif
 
   ret
 ; @end