avr: added com2w2 (slightly improved version of com2w).

- move IRQ control to main code (only the main code knows exactly which
  combination of pins is used for com2)
- split one big module into multiple smaller files (easier to maintain)

avr/modules/com2w2/macros.asm

@@ -0,0 +1,90 @@
+; ***************************************************************************
+; copyright   : (C) 2026 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+#ifndef AVR_MODULES_COM2W2_MACROS_H
+#define AVR_MODULES_COM2W2_MACROS_H
+
+
+
+.macro M_COM2WCLKSETLOW
+  sbi COM_CLK_DDR, COM_CLK_PIN          ; set CLK as output
+  cbi COM_CLK_OUTPUT, COM_CLK_PIN       ; set CLK low
+.endmacro
+
+
+
+.macro M_COM2WCLKSETHIGH
+  cbi COM_CLK_DDR, COM_CLK_PIN           ; set CLK as input
+.ifndef COM_CLK_PUE
+  cbi COM_CLK_OUTPUT, COM_CLK_PIN        ; disable pullup on CLK
+.endif
+.endmacro
+
+
+
+.macro M_COM2WDATASETLOW
+  sbi COM_DATA_DDR, COM_DATA_PIN          ; set DATA as output
+  cbi COM_DATA_OUTPUT, COM_DATA_PIN       ; set DATA low
+.endmacro
+
+
+
+.macro M_COM2WDATASETHIGH
+  cbi COM_DATA_DDR, COM_DATA_PIN           ; set DATA as input
+.ifndef COM_DATA_PUE
+  cbi COM_DATA_OUTPUT, COM_DATA_PIN        ; disable pullup on DATA
+.endif
+.endmacro
+
+
+
+.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
+  inr r16, COM_IRQ_ADDR_CLK               ; enable pin change irq for CLK line
+  ori r16, (1<<COM_IRQ_BIT_CLK)
+  outr COM_IRQ_ADDR_CLK, r16
+;  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
+
+
+
+.macro M_COM2WSETUPPCICR
+  inr r16, COM_IRQ_ADDR_CLK               ; enable pin change irq for CLK line
+  ori r16, (1<<COM_IRQ_BIT_CLK)
+  outr COM_IRQ_ADDR_CLK, r16
+
+  inr r16, COM_IRQ_ICR_ADDR               ; enable pin change irq in PCICR
+  ori r16, (1<<COM_IRQ_ICR_BIT)
+  outr COM_IRQ_ICR_ADDR, R16
+  ldi r16, (1<<COM_IRQ_IFR_BIT)           ; clear pending irq by writing 1 to CLK bit
+  out COM_IRQ_IFR_ADDR, r16
+.endmacro
+
+
+
+
+#endif
+