; ***************************************************************************
; 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.   *
; ***************************************************************************


; ***************************************************************************
; code

.cseg


; ---------------------------------------------------------------------------
; @routine NETMSG_ValueRead @global
; Read a VALUE message.
;
; @param  X       buffer to read from
; @return R17     value id
; @return R19:R18 value
; @return R21:R20 denom (e.g. 100, meaning value must be divided by 100)
; @return R22     source address
; @return R23     command
; @return R25:R24 message id

NETMSG_ValueRead:
  adiw xh:xl, 2
  ld r23, X+    ; command
  ld r22, X+    ; src address
  adiw xh:xl, 4 ; skip uid
  ld r24, X+    ; msg id (low)
  ld r25, X+    ; msg id (high)
  ld r17, X+    ; value id
  adiw xh:xl, 1 ; skip value type
  ld r18, X+    ; value (low)
  ld r19, X+    ; value (high)
  ld r20, X+    ; denom (low)
  ld r21, X+    ; denom (high)
  sbiw xh:xl, 16                                        ; back to msg begin
  ret
; @end