My vendors also keep asking me for a checksum for PICs.  Since there
are many ways to calculate checksums, it's pretty hard
to figure out what they want.  They don't know either:  their
programmer s/w just gives them a bunch of hex digits as a
checksum and they don't know how it was calculated.

Our solution is that they program a "first article" chip, I
install it in the breadboard, prototype or pre-prod unit and
verify operation.  Then, I sign off on a First Art approval
for programming the PIC.

Sometimes I will read the program from the First Article
PIC into MPLAB, save the file and compare to my original hex file.


   > -----Original Message-----
   > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
   > Of Harold Hallikainen
   > Sent: Monday, May 16, 2005 6:14 PM
   > To: Microcontroller discussion list - Public.
   > Subject: Re: [PIC] MPLAB Checksum display?
   >
   >
   > I agree, but we should be able to get a checksum for the whole
   > chip so the
   > vendor doing the programming knows they got all the data correctly (no
   > dropped records, etc.).
   >
   > Thanks!
   >
   > Harold
   >


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