mEDBG programming fuses on ATMega168pb fails

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jaycarlson
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Posted by jaycarlson: Wed. Sep 13, 2017 - 12:46 AM
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I'm trying to change the clock selection on the ATMega168pb, but whenever I attempt to program the new value, the fuses fail to program.

 

I'm using an Xplained Mini board, using the on-board mEDBG debugger/programmer.

 

I've tried powering the MCU from the built-in 5V supply, or from external supplies, too, with no luck.

 

What's going on?

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Tools, In-System Debuggers and Programmers
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meolsen
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Posted by meolsen: Wed. Sep 13, 2017 - 01:02 AM
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http://www.atmel.com/Images/Atmel-42250-ATmega168-Xplained-Mini_User-Guide.pdf page 4: The mEDBG will prevent writing certain fuse combinations in order to protect your kit.

:: Morten

 

(yes, I work for Microchip, yes, I do this in my spare time, now stop sending PMs)

 

The postings on this site are my own and do not represent Microchip’s positions, strategies, or opinions.

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jaycarlson
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Posted by jaycarlson: Wed. Sep 13, 2017 - 01:17 AM (Reply to #2)
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meolsen wrote:
http://www.atmel.com/Images/Atme... page 4: The mEDBG will prevent writing certain fuse combinations in order to protect your kit.
 

Thanks for the info. Having said that, it's insane that Atmel doesn't trust me with the internal 8 MHz oscillator.

 

Development boards should allow the user to mimic production hardware to prove out a system. I have literally never used an external clock --- ever --- in any of my designs.

 

These Atmel dev boards are infuriating.

Last Edited: Wed. Sep 13, 2017 - 01:19 AM
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meolsen
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Posted by meolsen: Wed. Sep 13, 2017 - 01:30 AM
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Didn't you just try to program 0ms settle time?

Maybe you find them infuriating, but I think more would be if we didn't save them from some fuse configurations...

:: Morten

 

(yes, I work for Microchip, yes, I do this in my spare time, now stop sending PMs)

 

The postings on this site are my own and do not represent Microchip’s positions, strategies, or opinions.

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