52 lines
1.2 KiB
NASM
52 lines
1.2 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2026 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_INCCOUNTER32_ASM
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#define AQH_AVR_COMMON_INCCOUNTER32_ASM
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; ***************************************************************************
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; code
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.cseg
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; ---------------------------------------------------------------------------
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; @routine Utils_IncrementCounter32 @global
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;
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; Increment a 32 bit counter at the address given by X.
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;
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; @param X Address of the 4 byte counter (1. byte is LSB)
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; @clobbers r18, r19, r20, r21, 22
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Utils_IncrementCounter32:
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ld r18, x+
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ld r19, x+
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ld r20, x+
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ld r21, x
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ldi r22, 1
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add r18, r22
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clr r22 ; doesn't affect carry flag
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adc r19, r22
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adc r20, r22
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adc r21, r22
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st x, r21
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st -x, r20
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st -x, r19
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st -x, r18
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ret
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; @end
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#endif
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