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Checksum question

 
Old Oct 29, 2016, 03:18 AM
  #1  
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Checksum question

Hi,


Does anyone know how Mitsubishi calculate the checksum for SH7052 once it goes above FFFF . The only info i can find suggests you drop the hi byte and use the 4 low bytes but it must keep track of the rollover to remain accurate. I know ecuflash does the checksum but i'm working on my bike and am having to do it manually.


Alternatively could someone stick my bin file in idapro and switch off the checksum for me.
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Old Oct 29, 2016, 09:54 PM
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its a rolling additive...

ie 0xffff + 0x0002 = 0x0001...

overflow is lost/not kept...
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rumpig (Oct 31, 2016)
Old Oct 31, 2016, 02:31 AM
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That's what I have been trying, i'll keep at it and see how I go.
Thanks
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