65 lines
1.8 KiB
NASM
65 lines
1.8 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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#ifndef AQH_AVR_COMMON_RESSOURCE_H
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#define AQH_AVR_COMMON_RESSOURCE_H
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; ***************************************************************************
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; defs
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; ***************************************************************************
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; code
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.cseg
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; ---------------------------------------------------------------------------
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; @routine RES_GetRessource
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;
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; The Ressource table has one entry for every ressource handled by this table.
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; The first entry contains the number of ressource entries in the table.
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; All following entries contain byte pointer addresses (for LPM) to ressources.
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; Ressource ids start with zero.
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;
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; @param r17:r16 ressource id (starting with 0)
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; @param Z pointer to start of ressources in FLASH (byte address)
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; @return CF set if ressource found, cleared otherwise
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; @return Z if CF set: pointer to ressource (byte address)
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; @clobbers r16, r17, r18
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RES_GetRessource:
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lpm r18, Z+ ; first entry: number of entries in table
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cp r16, r18 ; id must be < num entries
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lpm r18, Z+ ; Z points to first entry now
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cpc r17, r18
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brcc RES_GetRessource_ret
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RES_GetRessource_getRessource:
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lsl r16 ; byte address, so we need to add ressource id twice (i.e. *2)
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rol r17
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add zl, r16
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add zh, r17
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lpm r16, Z+
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lpm r17, Z+
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mov zl, r16
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mov zh, r17
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sec
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RES_GetRessource_ret:
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ret
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; @end
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#endif
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