added initial wait routine.

avr/common/0BUILD

@@ -14,6 +14,7 @@
     utils.asm
     utils_copy_from_flash.asm
     utils_copy_sdram.asm
+    utils_initial_wait.asm
     utils_wait.asm
     utils_wait_fixed.asm
     utils_wait_pin.asm

avr/common/utils_initial_wait.asm

@@ -0,0 +1,41 @@
+; ***************************************************************************
+; 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.   *
+; ***************************************************************************
+
+
+
+
+; ---------------------------------------------------------------------------
+; @routine Utils_InitialWait
+;
+; Initial wait to desync nodes.
+;
+; This routine waits for between 10 to 2560 milliseconds (derived from UID)
+;
+; @clobbers r16, r17, r18, r19, r20, r21, r22, X
+
+Utils_InitialWait:
+  ; setup initial wait loop
+  rcall Utils_ReadUid             ; (R16, X)
+  clr r16
+  eor r16, r18
+  eor r16, r19
+  eor r16, r20
+  eor r16, r21
+
+Utils_InitialWait_l1:               ; wait R16 x 10 milliseconds
+    ldi r17, 200
+Utils_InitialWait_l2:               ; wait for 10ms
+     rcall Utils_WaitFor50MicroSecs ; (R22)
+     dec r17
+    brne  Utils_InitialWait_l2
+    dec r16
+  brne Utils_InitialWait_l1
+  ret
+; @end
+