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  VS Arduino › Visual Micro › Installation & Troubleshooting › nonstop reading from serial port
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devpap7
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nonstop reading from serial port
Sep 21st, 2014 at 8:17pm
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Hi everyone,

i wrote a sketch inspired by a book for arduino software. Basically the code is waiting for serial events in the serialEvent-Function. 
When I upload the code using Visual Studio 2012 oder Atmel Studio 6.2 (in debug mode) and send something through the serial window my arduino ist justing running crazy. TX and RX are generally lit up. Can't send more commands in this state.
But if I m using the Arduino Development Enviroment my sketch is running an detecting my commands. Did I miss to check some properties or anything like this. If interested, find the source is in the attachment of this post.

thanks for support
  
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Tim@Visual Micro
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Re: nonstop reading from serial port
Reply #1 - Sep 21st, 2014 at 10:01pm
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Yes that sort of makes sense.

By default the debugger gives an easy option where it can be shared with normal serial.println()  use from within the Arduino code.

However if you are sending from the pc then this will interfere with the pause/continue mechanism of the debugger. Less so if you do not have any breakpoints that pause/break (ie: Only have Trace points)

It's not supported to share the serial port with the debugger and also to send manually serial data to the arduino using the same port.

Of course you could upload without debugging and it will perform the same as the Arduino Ide but that means no debug.

As an alternative Visual Micro support debug on other Serial ports or using 1 or 2 digital pins. Please see this page from the Documentation for more details http://www.visualmicro.com/page/User-Guide.aspx?doc=Tracepoints-and-execution-sp...
  
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devpap7
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Re: nonstop reading from serial port
Reply #2 - Sep 22nd, 2014 at 10:33am
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this is a pretty good answer. thank you very much. i ll try to configure a different port or even another pin. I m not exactly sure what this means right now.
Using the Arduino Uno, is it even possible to redirect the debugger to another port?
Isn't there just one serial port on this board?
« Last Edit: Sep 22nd, 2014 at 10:37am by devpap7 »  
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Re: nonstop reading from serial port
Reply #3 - Sep 22nd, 2014 at 12:21pm
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Hi,

You are right with the Uno you only have one real serial port but you can use the Visual Micro "SoftwareSerial" option in the debugger properties.

This allows you to buy an FTDI cable which plugs into your pc usb and allows you to connect a couple of wires from digital pins to the cable. Then the Arduino pretends to be a serial port.

The SoftwareSerial option is best used at speeds <= 56k and for non-break (trace mode) requires only one wire/pin.
  
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Re: nonstop reading from serial port
Reply #4 - Sep 22nd, 2014 at 2:58pm
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Interesting, thank you for your advice. for now I ll just can change the board. the software serial options is also worth a look, but right now there is no FTDI cable abvailable. Can you point me to such hardware. I don't know this kind of hardware. just a likewise cable which is compatible with the arduino uno.
« Last Edit: Sep 22nd, 2014 at 3:20pm by devpap7 »  
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Re: nonstop reading from serial port
Reply #5 - Sep 22nd, 2014 at 3:19pm
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makes sense, you might also find that using TracePoints instead of BreakPoints avoids the issue
  
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