Processing 1.0 - Processing Discourse - trying2use 2virtualCOMports.getting coffeeCupFreez

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Index › Programming Questions & Help › Electronics, Serial Library › trying2use 2virtualCOMports.getting coffeeCupFreez

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trying2use 2virtualCOMports.getting coffeeCupFreez (Read 1056 times)

dangirl

trying2use 2virtualCOMports.getting coffeeCupFreez
Jan 28^th, 2009, 10:27pm

hi,
has anyone ever run 2 virtual com ports through the macbook pro (on either the mac or windows xp through bootcamp)?

I'm trying to use 2 usb virtual com ports to run a custom wireless system on my macbook pro 3.1 with osx 10.5.6 and processing 1.01. I'm using the SiLabsUSB VCPDriver_CP210x

I've used it with 1 and it's fine, but when I plug in 2 it recognises them, but either crashes the machine or I get a little coffee cup icon sitting in the doc that won't disappear until i reboot, and nothing else happens - the(255,500) stage doesn't open and then the code doesn't run beyond listing the serial ports.

code:
--
import processing.serial.*;
Serial myPort1, myPort2;

void setup()
{
println ("*");
size(255, 500);
background(200);
println(Serial.list());
myPort1 = new Serial(this, Serial.list() [0], 230400);
myPort2 = new Serial(this, Serial.list() [1], 230400);

}
void draw()
{
println ("**");
}
--

monitor print out:
--

*
Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7
[0] "/dev/tty.SLAB_USBtoUART0001"
[1] "/dev/cu.SLAB_USBtoUART0001"
[2] "/dev/tty.SLAB_USBtoUART"
[3] "/dev/cu.SLAB_USBtoUART"
[4] "/dev/tty.Bluetooth-Modem"
[5] "/dev/cu.Bluetooth-Modem"
[6] "/dev/tty.Bluetooth-PDA-Sync"
[7] "/dev/cu.Bluetooth-PDA-Sync"
--

thanks

NoahBuddy Ex Member	Re: trying2use 2virtualCOMports.getting coffeeCupF Reply #1 - Feb 2^nd, 2009, 10:30am In the list of devices [0] and [1] have the same name. Have you tried: myPort2 = new Serial(this, Serial.list() [2], 230400); I admit I don't know what the 'tty' and 'cu' stand for, though.

dangirl

Re: trying2use 2virtualCOMports.getting coffeeCupF
Reply #2 - Feb 2^nd, 2009, 12:56pm

thanks. I identified (and resolved) the problem. it's a hardware problem basically - something particular to this mac. while it lists the different devices, it doesn't actually give them each a com port (despite what the Serial.list outcomes suggest) but if I use a usb hub in the left hand side of the machine, next to the power supply, it assigns a com port to each and works as it should (doesn't work on the usb port on the right hand side though, only on the left).

I also don't know what the 'tty' and 'cu' stand for, but I do know that 'tty' is the one you want.

thanks for your input

koogy

Re: trying2use 2virtualCOMports.getting coffeeCupF
Reply #3 - Feb 2^nd, 2009, 1:13pm

NoahBuddy wrote on Feb 2^nd, 2009, 10:30am:

I admit I don't know what the 'tty' and 'cu' stand for, though.

tty is 'teletype', a hold-over from the olden days when terminals connected to mainframes were teletype devices rather than keyboards and monitors (like a typewriter, printed output. first time i ever used unix was on one of these things, 1986). it's basically a standard serial connection but these days lots of things like usb connections appear as tty connections.

NoahBuddy Ex Member	Re: trying2use 2virtualCOMports.getting coffeeCupF Reply #4 - Feb 2^nd, 2009, 8:35pm Thank you koogs for the explanation. Perhaps you have a USB and a USB2.0 port? A hub has solved software conflicts for me (drivers really) and was able to slow down the USB2.0 device.

dangirl

Re: trying2use 2virtualCOMports.getting coffeeCupF
Reply #5 - Feb 2^nd, 2009, 9:01pm

re: Perhaps you have a USB and a USB2.0 port?

perhaps. I just looked at the hardware info for this machine and it does say USB Bus and USB High Speed Bus. (as well as the track pad and IR and bluetooth). I'll see if I can find another machine to test if this is the problem and will report back as it would be good to know. the hub I was using was USB2.0, so the logic is consistent.

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