Need help with USB programming

[just4priya]

Hi
I am trying to write a file to a USB device using C program..
When i try to open the USB port, i find the foll error

"open_port: unable to open usbdev2.1_ep81: No such file or directory"

The command to open the USB port:

sprintf(portfile,"/dev/usbdev2.1_ep81");
if((fd=open(portfile, O_RDWR | O_NOCTTY | O_NDELAY))==-1)
perror("open_port: unable to open usbdev2.1_ep81");

Please provide some inputs/help

Thanks,
Priya

[kyku]

This might sound silly, but is the file really sitting on the file system, i.e. did you check that there's really a file called /dev/usbdev2.1_ep81 ?

[just4priya]

Hi

Ya actually i wanna access any of the USB ports available in /dev/
and write file to it.
Please help me out with this..
Thanks in advance

[kyku]

What do you want do do with this ports? Generally, you need a driver to access a device.

[just4priya]

What do you want do do with this ports? Generally, you need a driver to access a device.

I wanted to send data to USB Port using a C Program..

[NoahSteam]

It might present it self as a tty port.


ttyUSB0 or something

[kyku]

I wanted to send data to USB Port using a C Program..

Take a look at the libusb library. There are some tutorials to it floating around the web. You just need to google them. Good luck!