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In ArduinoISP.ino, add an option to enable a 4 MHz clock signal #8757

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autoiue wants to merge 1 commit into arduino:master from stimulu:master

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@autoiue autoiue commented Apr 7, 2019

Add an option on Uno boards to enable a 4 MHz clock signal on pin 3

This clock signal can be used to reprogram the fuses of an AVR that
has been set wrong (ie. when an external clock has been configured but
the board/chip does not have one).

This is disabled by default. We check that we compile for known chips
before enabling the clock generation. Maybe there is other chips that
support this code.

This clock signal can be used to reprogram the fuses of an AVR that
has been set wrong (ie. when an external clock has been configured but
the board/chip does not have one).
This is disabled by default. We check that we compile for known chips
before enabling the clock generation. Maybe there is other chips that
support this code.
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Hi @procsynth ,
thanks for your PR.

ArduinoISP sketch is meant to run on all Arduinos (also the ones with ARM chips), so it would be nice to keep the sketch functionalities in sync between all the targets.

The functionality is interesting and should be expanded a bit, like having a couple of options for the pin and the frequency to use, and less magic numbers 😉


#ifdef ENABLE_CLOCK_GEN

#if defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__) || defined(__AVR_ATmega88__)
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ArduinoISP sketch is meant to run on all Arduinos (also the ones with ARM chips), so it would be nice to keep the sketch functionalities in sync between all the targets.

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autoiue commented Apr 23, 2019

Hi @facchinm, thanks for your reply. I did not think in the scope of the whole Arduino project.
I'll make the changes requested, explain and test the code a little better when I have some time :)

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per1234 commented Sep 26, 2020

@per1234 per1234 added Component: Documentation Related to Arduino's documentation content feature request A request to make an enhancement (not a bug fix) labels Sep 3, 2022
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