usb driver problem

Thomas McGrath III mcgrath3 at
Sun Jan 16 23:37:00 EST 2011

The dev/tty.usbmodem1a21 does not show up in the list using the SerialTest.rev stack.

It does show up in the Arduino software Serial list. Also in the Arduino you have to use the tty.usbmodem1a21. Also when you plug the Arduino in the Mac detects a new modem and asks to set it up in Internet preferences pane. hit apply and then it shows up in Arduino.

When i use marks make board software the /dev/cu.usbmodem1a21 does show up or at least when I took out just that part of his code that searches the drivers.

	put OSXDeviceNames() into tFiles
   	filter tFiles WITH "/dev/cu.usbmodem*"

Sorta stuck now figuring this out.

-- Tom McGrath III
3mcgrath at

On Jan 16, 2011, at 6:19 PM, Sarah Reichelt wrote:

> On Sun, Jan 16, 2011 at 2:18 AM, Thomas McGrath III <mcgrath3 at> wrote:
>> I am having trouble accessing an Arduino Uno attached to my computer via USB.
>> The device driver shows up as "/dev/tty.usbmodem1a21"
>> I tried a simple open driver then read from driver then close driver. But Livecode keeps crashing or worse my computer panics and dies.
> When you get the driverNames, you should get a list of lines with
> three comma-separated items per line. Here is a sample of what I get
> with a KeySpan USB-serial adapter connected:
> KeySerial1,/dev/tty.KeySerial1,/dev/cu.KeySerial1
> USA28X1a2P1.1,/dev/tty.USA28X1a2P1.1,/dev/cu.USA28X1a2P1.1
> USA28X1a2P2.2,/dev/tty.USA28X1a2P2.2,/dev/cu.USA28X1a2P2.2
> Bluetooth-PDA-Sync,/dev/tty.Bluetooth-PDA-Sync,/dev/cu.Bluetooth-PDA-Sync
> The one you need to use to connect is the 3rd item i.e. the one
> starting with /dev/cu. instead of /dev/tty.
> While LiveCode cannot communicate directly with a USB port, it appears
> that the Arduino is providing a serial port, so this should work fine.
> On my web site, there is a serial test stack
> <> that might help you
> diagnose the connection issues.
> Cheers,
> Sarah
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