patchAVR Downloader/UploaDEr - Patches: patch #9004, DTR auto-reset does not work with...


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patch #9004: DTR auto-reset does not work with Arduino Pro Mini

Submitter:  Michal Suchanek <hramrach1>
Submitted:  Mon 16 May 2016 12:22:03 AM UTC
Category:  None Priority:  5 - Normal
Status:  None Privacy:  Public
Assigned to:  None Open/Closed:  Open

Mon 16 May 2016 12:22:03 AM UTC, original submission:  

The DTR line is held the whole time programming an Arduino is attempted.

As pointed out on the mailing list the onboard USB-TTL on Uno is connected to the AtMega reset pin through a capacitor so this can work for Uno.

On Pro Mini there is only a reset pin that you can connect to an external USB-TTL and normally there is no capacitor so DTR has to be released before programming is attempted. Otherwise the Pro Mini stays in reset the whole time and programming fails.

This also fixes bug #46005

For compatibility the old behavior is used on every other communication attempt but this may be superfluous.

Tested with Chinese Uno and Pro Mini

Michal Suchanek <hramrach1>


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Attached Files
file #37171:  invert_dtr.patch.txt added by hramrach1 (3KiB - text/plain)


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    Date Changed by Updated Field Previous Value => Replaced by
    2016-05-16 hramrach1 Attached File- Added invert_dtr.patch.txt, #37171

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