ttyACM0 on sdk sitara AM335x

mahut guillaume

Hi everybody,

I would like to create an application in the sdk sitara AM335x. I use the USB1 from the kit sitara. And with this one, I would like to develop a communication with a USB dongle in RS232 protocol. This usb dongle support the CDC class.

My kit sitara recognizes the usb dongle like I want (/dev/ttyACM0), and i can open the port. now I want to send and read any datas from and to the usb dongle.

So I created a C application. It works on my linux PC successfully. But when I use this application on kit sitara, I think I can send data but I can't read from usb dongle. Of course when i compiled this application with the good gcc for kit sitara.

Is someone have already met this problem?

Please help me! :'(

Regards

Guillaume Mahut

over 12 years ago

0 Bin Liu over 12 years ago

TI__Guru**** 167511 points

Mahut,

Is it the same issue you posted here: http://e2e.ti.com/support/arm/sitara_arm/f/791/p/272794/957302.aspx#957302?

If so, I think I am able to replicate the issue, I will update in this thread when I have progress of the investigation.

0 Rainer Berns over 11 years ago in reply to Bin Liu

Prodigy 190 points

I have the same problem with SKD 6 and kernel 3.2- My device is recognized :

[ 803.450866] cdc_acm 1-1:1.0: ttyACM0: USB ACM device
[ 803.458526] cdc_acm 1-1:1.2: ttyACM1: USB ACM device
[ 803.466552] cdc_acm 1-1:1.4: ttyACM2: USB ACM device
[ 803.474609] cdc_acm 1-1:1.6: ttyACM3: USB ACM device
[ 803.481964] cdc_acm 1-1:1.8: ttyACM4: USB ACM device
(The device sends debug information on port 4 if connected).

A cat /dev/ttyACM4 doesn't show any chars.

(At an Ubuntu 12.04 and a Win PC it works es expected).

Any help welcome.

Thanks

Rainer

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ttyACM0 on sdk sitara AM335x