srecord CRC16

From: Pygmi (bronco_castor_at_no_spam.hotmail.com)
Date: 12/30/04

  • Next message: Rich Webb: "Re: srecord CRC16" 
    Date: Thu, 30 Dec 2004 15:12:24 +0200

    I just found Peter Miller's srecord installed probably during
    WinAVR installation.

    I'm planning to add CRC to program memory (flash).
    For one Mega8 intel hex-file I tested this:
       srec_cat test.hex -intel -Big_Endian_CRC16 0x1FFA -o test2.hex -intel
    and it seems to provide reasonable output file.
    I guess it is OK to use some fixed address like here (MAX-6)...
    Better solutions (automated, when amount of flash changes) are welcome.

    srecord doc says that CRC is "industry standard"
    Is it compatible with
       WinAVR/avr/include/avr/crc16.h
    found from WinAVR package.
    /* Copyright (c) 2002, Marek Michalkiewicz
       All rights reserved.
    /* $Id: crc16.h,v 1.2 2002/12/12 11:41:01 joerg_wunsch Exp $ */
    /*
       avr/crc16.h - optimized CRC-16
       Polynomial: x^16 + x^15 + x^2 + 1 (0xa001)
       Initial value: 0xffff
     */

    Another question:
    What about the blank adresses in hex. Should they be filled?
    srecord manual says "Holes in the input data are ignored."

    Yes, I know it shouldn't take too much time to figur out
    these by myself...but I'm feeling a bit lazy at the moment.

        Pygmi

  • Next message: Rich Webb: "Re: srecord CRC16"