avr: introduce two more led modules.

- led_signal: blink 8 status bits (short=0, long=1)
- led_activity: blink for a short period after a trigger, e.g. for network
  activity

avr/modules/led_activity/0BUILD

@@ -0,0 +1,11 @@
+<?xml?>
+
+<gwbuild>
+
+  <extradist>
+    main.asm
+  </extradist>
+
+</gwbuild>
+
+

avr/modules/led_activity/main.asm

@@ -0,0 +1,90 @@
+; ***************************************************************************
+; copyright   : (C) 2025 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.   *
+; ***************************************************************************
+
+
+.equ LED_ACTIVITY_TIME = 2
+
+
+
+; ***************************************************************************
+; data
+
+.dseg
+
+ledActivityTimer:      .byte 1
+
+
+; ***************************************************************************
+; code
+
+.cseg
+
+
+LED_ACTIVITY_BEGIN:
+
+
+
+; ---------------------------------------------------------------------------
+; LedActivity_Init
+;
+; @return CFLAG: set if okay, clear on error
+; USED: R1, R2, R3, R4, R16, R17, X
+
+LedActivity_Init:
+  sbi LED_ACTIVITY_DDR, LED_ACTIVITY_PINNUM  ; out
+  ldi r16, 50
+  sts ledActivityTimer, r16                  ; keep on for 5s at the beginning
+  sec
+  ret
+
+
+
+; ---------------------------------------------------------------------------
+; @routine LedActivity_Every100ms @global
+;
+; @clobbers r16, r17
+
+LedActivity_Every100ms:
+  lds r16, ledActivityTimer
+  tst r16
+  breq LedActivity_Every100ms_ret
+  dec r16
+  sts ledActivityTimer, r16
+  brne LedActivity_Every100ms_ret
+  sbi LED_ACTIVITY_PORT, LED_ACTIVITY_PINNUM ; turn LED off
+LedActivity_Every100ms_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine LedActivity_Restart @global
+;
+; @clobbers r16
+
+LedActivity_Trigger:
+  lds r16, ledActivityTimer
+  tst r16
+  brne LedActivity_Trigger_ledIsOn
+  cbi LED_ACTIVITY_PORT, LED_ACTIVITY_PINNUM ; turn LED on
+LedActivity_Trigger_ledIsOn:
+  ldi r16, LED_ACTIVITY_TIME
+  sts ledActivityTimer, r16
+  ret
+; @end
+
+
+
+
+LED_ACTIVITY_END:
+.equ MODULE_SIZE_LED_ACTIVITY = LED_ACTIVITY_END-LED_ACTIVITY_BEGIN
+
+
+