Serial port problem

balaqemu · 08-23-2011, 06:55 AM

Hi,
I'm trying to read and write data using simple serial port C code .

I can open the serial Port /dev/ttyACM0 .
but when ever I try to write something I get the following error

"open error 5 Input/output error:

Pls help to fix this problem

Wim Sturkenboom · 08-24-2011, 09:17 AM

Permissions? Initially try to run as root (or with sudo). Still the same error?

Else it might be time to show the relevant code.

balaqemu · 08-25-2011, 06:50 AM

Hi,
I tried this through the root user also , but still same problem .
actually I connect a USB device called CC2530ZNP from TI to the USB port , and this creates virtual serial port with port name /dev/ttyACM0 . I could see this in /dev/ ..

But when I try to read the data from that port I get the input/output error .

The following is the code i'm using http://www.comptechdoc.org/os/linux/programming/c/com.c .
I run this on ubuntu 11.04. and it works fine with the other ports like /dev/ttyS0 .

what may be the problem , ?

regards
Bala

aizkorri · 08-25-2011, 10:31 AM

wrote in the wrong thread, sorry

balaqemu · 08-29-2011, 12:45 PM

Hi,
Still I'm not able to solve the serial port problem .
When I do $ cat /dev/ttyACM0 I get the error "input/out put error "

I contacted the vendor they said that I need rebuild kernel with silght modification at the USB device driver .
I just enable the ACM device before compiling the kernal ..

Is there any way to do few setting to USB drivers with out compiling the kernal ..?