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From: | Martin Stejskal |
Subject: | Re: [avr-chat] Bricked AVR |
Date: | Sun, 25 Mar 2018 20:46:13 +0000 |
On 03/25/18 12:05, Kimson Muriungi wrote:
> Hi guys,
>
> I have a custom mega 2560 avr control board that I just got bricked by
> setting the wrong fuses accidentally. It is surface mount, so i cannot
> use fuse bit doctor or high voltage programming to reset it. Sadly I
> also didnt include JTAG in my design. The fuses have been set to Low
> frequency crystal oscillator. The only thing I have around that could
> help is a USBTiny ISP programmer, and a 32khz crystal, which i hoped
> would probably provide the low frequency to make it run as per the fuse
> settings. I have not managed to change that until now. I am aware that
> ISP programming frequency should be utmost 1/4 of the 32 khz. Is there a
> way I can set ISP frequency of that level (6 to 8 khz) using avrdude and
> command prompt? Probably I'll be able to reset the fuses this way.
>
> Or if there is any other way Id bring this chip back, I'd gladly use it.
>
https://learn.adafruit.com/usbtinyisp/avrdude
Tom Dean
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