You add up all the byte numbers and then subtract from FF, so for this the
checksum is FF - (02 + 06 + 70 + 00 + 1A + 29) = 45.

Martin

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Benjamin Menk|c
Sent: 17 October 2001 09:55
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]: Checksum of a hexfile


How is the checksum of a pic hexfile calculated?

ie:
:020670001A2945

in this line 0x45 is CS, but i don't know why.



regards,



Ben



--------------------------
Benjamin Menk|c
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Meinen PGP-Schl|ssel kann man unter:

http://www.auto-intern.com/php/pgp_menkuec.php

finden.

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