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AID: PICStart Programmer at Interaccess

From: Steven Wood   stevenikoro.com
Date: Fri, 22 Oct 2004 14:20:55 -0700

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After Mike mentioned to me that the PICSTART Programmer wasn't working
properly, I ran some tests myself to see if my experiences would be any
different.  I've left a file on the machine in "sdwood's Documents/aid"
with complete details in case it's of use to anyone.  In the end I only
managed to prove what Mike already knew: It doesn't seem to work.

The curious thing, though, is that it did seem to work when programming
all 0's or  all 1's.  I was, say, able to set the MPLAB memory registers
to 0x0000 and write the contents to the PIC.  Then after filling the
MPLAB memory with 0x3FFF, a Read operation from the PIC would correctly
reset them to 0x0000.  And vice-versa.  There were still serial
time-outs during these operations.

The same procedure wouldn't work for actual program code, though.  I did
diffs of MAIN.HEX against a few different Program, Read round-trip
cycles and found lots of discrepancies.  The errors occurred at
addresses throughout memory ranges, and were not isolated to where
serial timeouts occurred.

Does this help anyone?

Steve


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