74 lines
1.8 KiB
NASM
74 lines
1.8 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2023 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 flashHandleFlashStart
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; Handle FLASH START packet.
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;
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; @return CFLAG set if message is for us, cleared otherwise
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; @param X buffer containing the message
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; @clobbers r16, (R15, R17, R18, R19, R20, R21, R22, X)
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flashHandleFlashStart:
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rcall flashCheckFlashStart
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brcc flashHandleFlashStart_notMe
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; okay, flash start message is for us
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rcall flashWaitFor100ms
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clr r16
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rcall flashSendFlashResponse ; (R15, R16, R17, R18, R19, R20, R21, R22, X)
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sec
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ret
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flashHandleFlashStart_notMe:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine flashCheckFlashStart
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;
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; Check whether the UID in the given msg matches our UID.
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;
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; @return CFLAG set if message is for us, cleared otherwise
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; @param X buffer containing the message
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; @clobbers r16, r17, r18, X, Y
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flashCheckFlashStart:
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ldi yh, HIGH(flashUid)
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ldi yl, LOW(flashUid)
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adiw xh:xl, FLASH_PACKET_START_OFFS_UID
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ldi r18, 4
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flashCheckFlashStart_loop:
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ld r16, X+
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ld r17, Y+
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cp r16, r17
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brne flashCheckFlashStart_notMe
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dec r18
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brne flashCheckFlashStart_loop
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sec
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ret
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flashCheckFlashStart_notMe:
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clc
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ret
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; @end
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