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  VS Arduino › Visual Micro › Usb/Serial/WiFi Debugging › VM resetting target when started
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Normal Topic VM resetting target when started (Read 420 times)
FylB
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VM resetting target when started
Dec 19th, 2024 at 5:02am
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I have an Arduino project that runs fine except for some code bug that causes it to fail after about a week. I have a bunch of debug statements outputting variables et al to the COM port. I would like to be able to leave this project running and end VM whereupon, after it fails a week later, I'd like to bring VM up to look at the COM port data. Unfortunately, VM seems to be resetting my target when it initializes. How can I get it to stop doing that and let me see the COM data without resetting it?
  
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Acuario
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Re: VM resetting target when started
Reply #1 - Dec 19th, 2024 at 7:22am
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I do a similar thing but I don´t rely on Visual Studio/VM as I use it for other things.
I use a terminal program called Termite and connect this to the COM port to record the data on the serial port.

If you get an exception with a stack trace you can copy this from the Termite output and, after loading your project in VM, open the com port (or IP port, it doesn´t matter). Disconnect the monitor (Connect button) and paste the stack into the monitor window. With Termite connected VM won´t be able to connect to the com port so your target won´t get reset.

The monitor will then give you the exception decoder button to see the stack trace.

Hope this helps.
  
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Simon@Visual Micro
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Re: VM resetting target when started
Reply #2 - Dec 19th, 2024 at 10:06am
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The resetting of the board is likely related to the DTR/RTS settings in the Serial Monitor.  If you can attach a build log with the settings shown at the top of the page we will investigate further.

Visual Micro includes Serial Monitor Logging, which can be enabled by clicking the "Log" button in the top right of the Serial Monitor Window.

You can also edit where these files are logged, as shown on the below page (Item 17):
https://visualmicro.com/page/User-Guide.aspx?doc=Serial-Monitor.html

« Last Edit: Dec 19th, 2024 at 10:21am by Simon@Visual Micro »  
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FylB
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Re: VM resetting target when started
Reply #3 - Jan 4th, 2025 at 5:56pm
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So I did a bit more investigation into this and found that every terminal app causes a reset of my target. In looking at the hardware I realized that, as you say, DTR is controlling the Atmel reset input. After I disconnected this line, terminal apps now do not reset the Atmel. I can use this to debug my code but I also see that VM needs to control the reset to function properly.

I'm using an Adafruit CP2104 USB to serial converter and my suspicion is that the 2104 part toggles DTR when a USB device connects to it. The data sheet does not explicitly say this but it appears to be the case just from the the behavior of the device.
  
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Simon@Visual Micro
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Re: VM resetting target when started
Reply #4 - Jan 6th, 2025 at 8:56am
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Thanks for the report.

You can disable DTR in the vMicro Serial Monitor at the bottom of the window before connecting it (per-Visual Studio Load) for normal Serial Comms, and it is often used in reset functionality for uploads (depending on the board in use).

The chip does appear to support auto reset functionality which it controls, the below post implies a 100nf Capacitor needs to be installed between the CP2104's CTS Pin and the targets' Reset pin:
https://forums.adafruit.com/viewtopic.php?t=143419

Does adding (or removing if already present) this circuitry help at all?

Can you confirm which board you are using with this adapter?
  
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