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[avrdude-dev] [bug #42267] jtag3isp fails to read lock and fuse bytes di
[avrdude-dev] [bug #42267] jtag3isp fails to read lock and fuse bytes directly after changing lock byte
Fri, 02 May 2014 09:43:31 +0000
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Summary: jtag3isp fails to read lock and fuse bytes directly
after changing lock byte
Project: AVR Downloader/UploaDEr
Submitted by: matthijs
Submitted on: Fri 02 May 2014 09:43:30 AM GMT
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: None
Assigned to: None
Originator Name: Matthijs Kooijman
Discussion Lock: Any
I'm having some trouble reading and verifying the lock bits with jtag3isp.
jtag3 works as expected. I'm using Avrdude 6.0.1.
It seems that (shortly) after writing the lock byte, the fuse and lock bytes
no longer read correctly. When the clock is slower, only the first few reads
after the write fail, suggesting that this is somehow a timing problem.
The problem did not occur when writing the fuse bytes, only when writing the
See the attachment for an extensive log of commands and output, along with
inline comments by me showing the problem.
I haven't tried actually sniffing the SPI bus to see what values are actually
returned by the device being programmed. I might try that if you think it
helps (and my bus pirate is fast enough ;-p).
Date: Fri 02 May 2014 09:43:30 AM GMT Name: log.txt Size: 44kB By:
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- [avrdude-dev] [bug #42267] jtag3isp fails to read lock and fuse bytes directly after changing lock byte,
Matthijs Kooijman <=