Re: [libusb] Asynchronous transfer using libusb-1.0 on ubuntu

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

Anand Nahar wrote:
> @Chris 
>
> why are you using Libusb to perform low-level file transfer?
>
>   * Libusb provides me with more control over the USB hardware. Apart
>     from data transfer, there are other aspects to the project which
>     needs the low level USB commands for e.g. isochronous transfers. I
>     also need to send particular data sequence to a particular set of
>     blocks on the device which are known to break things in the past.
>     fopen() and fprintf() being high level API’s doesn’t guarantee me
>     anything. Also, doesn't their implement depend on the platform
>     itself? I may be wrong with these assumptions and there may be a
>     way to do all these things using the high level API's.
>

A device that meets the USB Mass Storage spec is certainly not going to
have any isochronous endpoints.

If your device has a file system, then it's clearly ridiculous to use
libusb.  There are far too many details for you to track.

If you're skipping the file system and just using it as a raw data
store, all of the operating systems have ways of writing directly to
blocks on the disk.  Linux makes it easy; just open /dev/sdc, seek, and
write.  Windows is not much more difficult.

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