47 lines
1.4 KiB
NASM
47 lines
1.4 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2025 by Martin Preuss
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; email : martin@libchipcard.de
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;
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; ***************************************************************************
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; * This file is part of the project "AqHome". *
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; * Please see toplevel file COPYING of that project for license details. *
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; ***************************************************************************
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; ***************************************************************************
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; code
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.cseg
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; ---------------------------------------------------------------------------
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; @routine NETMSG_ValueRead @global
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; Read a VALUE message.
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;
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; @param X buffer to read from
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; @return R17 value id
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; @return R19:R18 value
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; @return R21:R20 denom (e.g. 100, meaning value must be divided by 100)
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; @return R22 source address
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; @return R23 command
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; @return R25:R24 message id
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NETMSG_ValueRead:
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adiw xh:xl, 2
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ld r23, X+ ; command
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ld r22, X+ ; src address
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adiw xh:xl, 4 ; skip uid
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ld r24, X+ ; msg id (low)
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ld r25, X+ ; msg id (high)
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ld r17, X+ ; value id
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adiw xh:xl, 1 ; skip value type
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ld r18, X+ ; value (low)
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ld r19, X+ ; value (high)
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ld r20, X+ ; denom (low)
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ld r21, X+ ; denom (high)
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sbiw xh:xl, 16 ; back to msg begin
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ret
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; @end
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