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started reorganizing code into subfolders.

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This commit is contained in:
Martin Preuss
2023-04-22 00:04:10 +02:00
parent 97016b21b9
commit 5e12b8ad4e
40 changed files with 38 additions and 60 deletions
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60
avr/modules/com2/com2_crc.asm Normal file
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; ***************************************************************************
; copyright : (C) 2023 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. *
; ***************************************************************************
; ---------------------------------------------------------------------------
; add checksum byte to buffer
;
; IN:
; - X : pointer to packet buffer
; OUT:
; - CFLAG: set if okay, clear otherwise
; MODIFIED REGS: R16, R17, R18, R19, X
com2CalcAndAddChecksumByte:
adiw xh:xl, COM2_MSG_OFFS_MSGLEN
ld r18, X ; read msg len
sbiw xh:xl, COM2_MSG_OFFS_MSGLEN
inc r18 ; account for dest address
inc r18 ; account for msg len byte
rcall crc8Calc ; (R16, R17, R18, R20, X)
st X, r16 ; add checksum byte
sec
ret
; ---------------------------------------------------------------------------
; check message in buffer
;
; IN:
; - X : pointer to packet buffer
; OUT:
; - CFLAG: set if okay, clear otherwise
; MODIFIED REGS: R16, R17, R18, R19, R20, X
com2CheckMessageInBuffer:
adiw xh:xl, COM2_MSG_OFFS_MSGLEN
ld r18, X ; read msg len
sbiw xh:xl, COM2_MSG_OFFS_MSGLEN
inc r18 ; account for dest address
inc r18 ; account for msg len byte
rcall crc8Calc ; (R16, R17, R18, R20, X)
ld r17, X
cp r16, r17 ; should be equal
brne com2CheckMessageInBuffer_error
sec
ret
com2CheckMessageInBuffer_error:
clc
ret