VS Arduino - Serial Port on MKR1000 Disappears After Adding Breakpoint

Apr 24^th, 2024 at 9:46am (UTC)

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VS Arduino › › › Serial Port on MKR1000 Disappears After Adding Breakpoint

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Serial Port on MKR1000 Disappears After Adding Breakpoint (Read 1737 times)

yaletowneric Newbies Offline Posts: 8 Joined: Jul 8^th, 2020	Serial Port on MKR1000 Disappears After Adding Breakpoint Jul 8^th, 2020 at 2:57pm	Print Post
	I've been working on a program for a week or so now with vMicro on a MKR1000 using the serial debugger and it's been working great. This morning I added breakpoint to a constructor of one of my classes (maybe a mistake...). As soon as I did the upload the serial port disappeared from Windows never to return. I can put the board into bootloader mode and the bootloader COM port shows up (and the onboard LED pulses, which I assume indicates that it is in bootloader mode), but no combination of changing computer, trying to upload, reinstalling the Arduino IDE, etc. will make the main COM port responsive again to let me upload the code. Any ideas or am I the proud owner of an Arduino brick?


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Tim@Visual Micro Administrator Offline Posts: 12076 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Serial Port on MKR1000 Disappears After Adding Breakpoint Reply #1 - Jul 8^th, 2020 at 3:06pm	Print Post
	Thanks for the info. I doubt the breakpoint is related. You are saying that windows is not showing any usb ports. Please open device manager and see what ports or devices are displayed? More info ... You can see similar MKR1000 reports on google for "Serial Port on MKR1000 Disappears" https://forum.arduino.cc/index.php?topic=564418.0
	« Last Edit: Jul 8^th, 2020 at 3:06pm by Tim@Visual Micro »

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yaletowneric Newbies Offline Posts: 8 Joined: Jul 8^th, 2020	Re: Serial Port on MKR1000 Disappears After Adding Breakpoint Reply #2 - Jul 8^th, 2020 at 3:25pm	Print Post
	Actually, made a bit of progress. I was able to get the blink example to load via the boot loader (I'd reverted to using the Arduino IDE directly which failed, but when I tried again in vMicro it worked), which restored the COM port and things seem to be roughly back to normal and if I delete the breakpoints in the constructors things work. Putting a breakpoint in the constructor does replicate the issue.


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Tim@Visual Micro Administrator Offline Posts: 12076 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Serial Port on MKR1000 Disappears After Adding Breakpoint Reply #3 - Jul 8^th, 2020 at 3:38pm	Print Post
	Interesting to know thanks. We will have to add a note to the docs. Because you are using serial debugging the Serial object needs to be instantiated before it can be used. I guess your constructor is static? it must be being used before the arduino core is available. The MKR1000 should support hardware debug which would allow for lower level debugging outside of the Arduino core. Take a look at the Hardare Debug menu in Visual Micro when the MKR1000 is selected. It will show a list of suggested debuggers.
	« Last Edit: Jul 8^th, 2020 at 3:41pm by Tim@Visual Micro »

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yaletowneric Newbies Offline Posts: 8 Joined: Jul 8^th, 2020	Re: Serial Port on MKR1000 Disappears After Adding Breakpoint Reply #4 - Jul 8^th, 2020 at 3:49pm	Print Post
	Thanks for the quick support, and yes I think that must be what's happening, the constructor is being called for a global instance of the class. I coincidentally ordered up the Atmel ICE yesterday, so should be covered going forward.


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Tim@Visual Micro Administrator Offline Posts: 12076 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Serial Port on MKR1000 Disappears After Adding Breakpoint Reply #5 - Jul 8^th, 2020 at 4:09pm	Print Post
	Great, thanks for the report.


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