AVR 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 |
Attached Files
Depends on the following items: None found
Items that depend on this one: None found
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Follows 1 latest change.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
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2016-05-16 | hramrach1 | Attached File | - | ![]() |
Added invert_dtr.patch.txt, #37171 |
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