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  VS Arduino › Visual Micro › Installation & Troubleshooting › Serial DTR resetting on connection
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Normal Topic Serial DTR resetting on connection (Read 3795 times)
jljtgr
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Serial DTR resetting on connection
Apr 26th, 2016 at 6:18pm
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I hope this is the correct place for bug reports, I couldn't be quite sure.

Visual Micro 1604.18.0
Visual Studio 14.0.25123.00 Update 2 (2015 Community)

I seem to have an issue with the DTR line resetting to enabled(low) when connecting the Serial Monitor.

The way my ESP8266 is wired, having the DTR line low will tell the bootloader to get ready for programming when it resets.  So having the DTR toggle was very convenient when wanting to program or run code.

I'm not really sure which update changed things, but this worked fairly well when the Serial Monitor had "checkbox" options.  Now with the checkbox buttons, it's exhibiting this strange behavior.  (Unrelated, but same timeframe)

Steps to reproduce:
  • Hook a meter to the DTR pin
  • Check DTR button, meter should read logic LOW(~0v)
  • Uncheck DTR button, meter should read logic HIGH(~3.3v)
  • Uncheck Connect button, re-check Connect button
  • DTR button is still unchecked, meter should read logic HIGH, but reads LOW
  • Check DTR button, meter should read logic LOW
  • Uncheck DTR button, meter should read logic HIGH


This is mainly a problem because when the program gets uploaded, the Serial Monitor unconnects and reconnects, which resets the DTR to LOW, regardless of the checkbox button state.  To get DTR HIGH again, you may need to click the DTR button twice.
  
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Tim@Visual Micro
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Re: Serial DTR resetting on connection
Reply #1 - Apr 26th, 2016 at 8:54pm
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Thanks, that's a good bug found. 

It will be fixed in the next release but I think a workaround is to set the project property called "Micro Debug>Startup Delay or Dtr" = False

That debug setting is clashing with the serial monitor and forcing the dtr ON. After setting is to false the Dtr button should work as expect.

I think this has been a bug since July last hear! Oops!
« Last Edit: Apr 26th, 2016 at 8:55pm by Tim@Visual Micro »  
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jljtgr
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Re: Serial DTR resetting on connection
Reply #2 - Apr 26th, 2016 at 9:16pm
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Yes, I think that did help.  Thank you.

It didn't quite at first, but after a compile/upload cycle it seemed to take effect.

  
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Tim@Visual Micro
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Re: Serial DTR resetting on connection
Reply #3 - Apr 26th, 2016 at 9:19pm
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Thanks, the next release should be available in a few days. After installing please switch the StartupDelayOrDtr back on if you need debugger breakpoints early in program load such as the setup().
  
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