; ***************************************************************************
; 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 AQH_AVR_NETWORK_MSG_SIMPLEMSG_W_ASM
#define AQH_AVR_NETWORK_MSG_SIMPLEMSG_W_ASM



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

.cseg



; ---------------------------------------------------------------------------
; @routine NETMSG_SimpleMsgWrite
; Write a simple msg (only code and src address).
;
; @param  R16 dest addr
; @param  R18 msg code
; @param  X   buffer to write to
; @param  Y   pointer to network interface data
; @clobbers R18 (R16, R17, R19, R20, X)

NETMSG_SimpleMsgWrite:
  st X+, r16                          ; dest address
  ldi r16, 2                          ; msg code+src address+0 payload bytes
  st X+, r16                          ; msg len
  st X+, r18                          ; msg code
  ldd r16, Y+NET_IFACE_OFFS_ADDRESS
  st X+, r16                          ; src address
  
  sbiw xh:xl, 4  ; go back to beginning of message (1 byte dst addr, 1 byte length, 2 bytes payload)
  rcall NETMSG_CalcAndAddChecksumByte ; (R16, R17, R18, R19, R20, X)
  sbiw xh:xl, 5 ; go back to beginning of message (1 byte dst addr, 1 byte length, 2 bytes payload, 1 byte crc)
  ret
; @end



#endif

