Re: [libusb] Help

[Tim R. <ti...@pr...>]

Aaron Gomez | Rother Industries & Technology wrote:
>
> I am currently using the FTDI  device but only for testing. Finally I 
> will use a software library created by me where I will use libusb and 
> I will use it  with other devices that are multi-class (standard). For 
> this reason I wish obtain this via libusb.
>
> I know I could use the FTDI drivers but I want to get a general one 
> for multi-class devices.
>
I don't know what you mean by "multi-class (standard)".  The FTDI232R 
has its device class and subclass embedded in its device descriptor.  It 
has exactly one class.


> How to know the ttyUSBx/ttyACMx/... name with libusb? I could see that 
> when I connect the device in the path dev/serial/by-id/ a file is 
> created where its name is the components of string descriptor and it 
> is linked with the ttyUSBx/ttyACMx/... (path: /dev/tty...) file which 
> I need to open this file descriptor and start the communication.
>
Well, hang on.  If you have a ttyXXX device, then that means you already 
have a driver that is converting the USB device into a serial device.  
You cannot use libusb to talk to a /dev/ttyXXX device.  /dev/ttyXXX 
speaks serial protocol, not USB protocol.

-- 
Tim Roberts,ti...@pr...
Providenza & Boekelheide, Inc.