Suoritettu

Checksum algoritm (8-bit) calculation -- 2

D0 in the 11-bit vehicle CAN message is a checksum, need to find the mathematical relation between the other data byte values to be able to manipulate and send out the new values, with a correct checksum.

Some sample data (in hex):

9F 70 FC 70 FC 0D 0F 00,

A9 7A FC 70 FC 0D 0F 00,

AA 7B FC 70 FC 0D 0F 00,

AB 7C FC 70 FC 0D 0F 00,

AB 7C FC 70 FC 0D 0F 00,

0D 7D FC 70 FC 0D 0F 60,

0E 7E FC 70 FC 0D 0F 60,

09 79 FC 70 FC 0D 0F 60,

0A 7A FC 70 FC 0D 0F 60,

0B 7B FC 70 FC 0D 0F 60,

The checksum algoritm is a "BN2000" (which I have not found the specs for sadly to say).

We get close by using D0 = ((D1+D2+D3+D4+D5+D6+D7)-85)&0xFF, but it does not match up in all cases and differ +/- 2 decimal values.

Taidot: Algoritmi, Koodaus, Salaustekniikat, Matematiikka, Ohjelmointi

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( 2 arvostelua ) Vrigstad, Sweden

Projektin tunnus: #17784210

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dinhfreedom

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