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Index › Programming Questions & Help › Electronics,  Serial Library › PortInUseException in Windows
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PortInUseException in Windows (Read 962 times)
johnty
PortInUseException in Windows
Apr 19th, 2010, 1:10pm  
I'm facing a rather baffling problem:

I have two sketches; both use the serial port. I have two serial ports in the system. If I run the one sketch, it works fine with either port. If I try the other sketch, it can't open either port (throws a port in use exception). Its clear that the ports are free at the time of attempt (it can be opened by Hyperterminal, Arduino, and the *other* sketch).

The main difference between the two sketches is that the second one (that can't open the serial ports) uses the video library as well.

Any ideas why this is happening?
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johnty
Re: PortInUseException in Windows
Reply #1 - Apr 19th, 2010, 1:55pm  
ok i've figured it out:

it turns out that I called new on the serial port before the size() function, which results in the setup() being run twice. the second time around the port has already been open.

also, it appears as its only a problem when using the P2D renderer: if I use the default one, it doesn't happen.
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