crc - reverse engineering

[Michal Lukac]

Parada, dakujem :)

Uz aj tie horne 4 bity v tom poslednom byte mi davaju zmysel.
m.
 


> -----Original Message-----
> From: Hw-list <hw-list-bounces na list.hw.cz> On Behalf Of Jan Waclawek
> Sent: Wednesday, December 30, 2020 4:53 PM
> To: HW-news <hw-list na list.hw.cz>
> Subject: Re: crc - reverse engineering
> 
> Horne 4 bity posledneho bytu su podla mna este stale data.
> 
> Spodne 4 bity su kontrolny sucet, taky, ze sucet vsetkych 4-bitovych nibble
> ma ako spodny nibble 1111.
> 
> wek
> 
> 
> ----- Original Message ---------------
> 
> Subject: crc - reverse engineering
>    From: Lukac Michal <Michal.Lukac na fstroj.uniza.sk>
>    Date: Wed, 30 Dec 2020 14:30:02 +0000
>      To: "hw-list na list.hw.cz" <hw-list na list.hw.cz>
> 
> Dobry den,
> 
> Potreboval by som zistit sposob vypoctu CRC spravy.
> Uz som zistil vsetky bajty, len posledny je pravdepodobne nejake crc.
> Skusal som generatory na webe pre
> rozne crc8 ale nesedi mi to.
> Nevedeli by ste poradit ako na to?
> 
> Tu su pre priklad jednotlive spravy. Len mi pride divne ze napr. v spravach
> 8,9,10 a potom 11,12,13
> sa to crc nemeni. Ale menia sa tam 2byty jeden sa pripocita o 1 druhy
> odpocita o 1 takze "nejaky" sucet sa nemeni. To asi nebude nejake klasicke
> CRC ktore sa pocita delenim, ci moze byt?
> 
> dik za pomoc,
> m.
> 
> 
> 1  11000111 00001000 00000000 00000000 00000000 00000000 00001100 00000000
> 00001000
> 2  11010111 00001000 00000000 00000000 00000000 00000000 00001100 00000001
> 00000110
> 3  11010000 00001000 00000000 00000000 00000000 00000000 00001100 00000011
> 00001011
> 4  11010001 00001000 00000000 00000000 00000000 00000000 00001100 00000011
> 00001010
> 5  11010010 00001000 00000000 00000000 00000000 00000000 00001100 00000101
> 00000111
> 6  11010011 00001000 00000000 00000000 00000000 00000000 00001100 00000110
> 00000101
> 7  11010100 00001000 00000000 00000000 00000000 00000000 00001100 00000111
> 00000011
> 8  11010111 00001000 00000000 00000000 00000000 00000000 00001100 00000111
> 00000000
> 9  11010111 00000111 00000000 00000000 00000000 00000000 00001100 00001000
> 00000000
> 10 11010111 00000110 00000000 00000000 00000000 00000000 00001100 00001001
> 00000000
> 11 11010111 00000101 00000000 00000000 00000000 00000000 00001100 00001101
> 00001101
> 12 11010111 00000100 00000000 00000000 00000000 00000000 00001100 00001110
> 00001101
> 13 11010111 00000011 00000000 00000000 00000000 00000000 00001100 00001111
> 00001101
> 14 11010111 00000010 00000000 00000000 00000000 00000000 00001100 00010000
> 00001100
> 15 11010111 00000010 00000000 00000000 00000000 00000000 00001100 00010000
> 00001100
> 16 11010111 00001100 00000000 00000000 00000000 00000000 00001100 00010001
> 00000001
> 17 11010111 00001101 00000000 00000000 00000000 00000000 00001100 00010010
> 00001111
> 18 11010111 00001110 00000000 00000000 00000000 00000000 00001100 00010010
> 00001110
> 19 11010111 00010110 00000000 00000000 00000000 00000000 00001100 00010011
> 00000100
> 20 11010111 00010111 00000000 00000000 00000000 00000000 00001100 00010100
> 00000010
> 21 11010111 00011000 00000000 00000000 00000000 00000000 00001100 00010100
> 00000001
> 22 11010111 00100000 00000000 00000000 00000000 00000000 00001100 00010101
> 00000111
> 23 11010111 00100001 00000000 00000000 00000000 00000000 00001100 00010101
> 00000110
> 24 11010000 00100000 00000000 00000000 00000000 00000000 00001100 00010110
> 00001101
> 25 11000001 00011111 00000000 00000000 00000000 00000000 00001100 00011000
> 00001101
> 26 11010001 00011111 00000000 00000000 00000000 00000000 00001100 00011001
> 00001011
> 27 11010001 10011111 00000000 00000000 00000000 00000000 00001100 00011010
> 00000010
> 28 11011001 00011111 00000000 00000000 00000000 00000000 00001100 00011100
> 00000000
> 29 11010001 01011111 00000000 00000000 00000000 00000000 00001100 00011101
> 00000011
> 30 11010011 00011001 00000000 00000000 00000000 00000000 00001100 00011110
> 00001010
> 31 11010011 00011001 00000000 00000000 00000000 00000000 00001100 00011111
> 10000001
> 32 11010011 00011001 00000000 00000011 00000000 00000000 00001100 00100000
> 11001000
> 33 11010011 00011001 00000000 00000011 10111001 00000000 00001100 00100010
> 11100000
> 34 11010011 00011001 00000000 00000011 10111001 10111101 00001100 00100010
> 11110111
> 35 11010011 00011001 00000000 00000011 10111001 10111101 00001100 00100010
> 11110111
> 36 11110111 01010010 00000000 00000011 10111001 10111101 00001100 00100110
> 00111100
> 37 11010111 00010010 00000000 00000011 10111001 10111101 00001100 00100111
> 00000100
> 38 11000111 00010010 00000000 00000011 10111001 10111101 00001100 00101000
> 00000100
> 
> 
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