usb driver problem

Thomas McGrath III mcgrath3 at mac.com
Sat Jan 15 10:54:01 CST 2011


I now keep getting "file is not open for read" on the cu.usbmodem1a21 and "eof" on the tty.usbmodem1a21

What am I missing here? 


-- Tom McGrath III
http://lazyriver.on-rev.com
3mcgrath at comcast.net

On Jan 15, 2011, at 11:18 AM, Thomas McGrath III 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.
> 
> on mouseUp
>    put "" into field "IOresult"
>    open driver "/dev/tty.usbmodem1a21" for binary read // tried text read, text update, binary update
>    wait 50
>    read from driver "/dev/tty.usbmodem1a21" for 1 line in 4 second // tried for 3 char in 3 seconds, tried until eof
>    if it is not "" then
>        put "it: " &  it into field "IOresult" 
>    else
>        put "result: " & the result into field "IOresult"
>    end if
>    wait 50
>    close driver "/dev/tty.usbmodem1a21"
> end mouseUp
> 
> I just want to read data that is being sent from the board. In Arduino there is a serial monitor which does read the data coming from the board. It is a bunch of numbers one per line as in 1023  then 992  then 992 etc.
> 
> I can't seem to figure out what I am doing wrong. This seems pretty straight forward.
> 
> I sent an email to Mark Weider but then thought that others might also have ideas.
> 
> Thanks
> 
> 
> -- Tom McGrath III
> http://lazyriver.on-rev.com
> 3mcgrath at comcast.net
> 
> 
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