Re: [Ftdi-usb-sio-devel] Resetting the FTDI

[Chris S. <chr...@ya...>]

--- On Thu, 11/11/10, Michael Plante <mic...@gm...> wrote:
> I'd be surprised if there's anything the FTDI hardware can
> accomplish with
> ftdi-usb-sio, but not with libftdi.

Michael,

My application sends a 2 byte message to a device and receiving a 62 byte response ("ping pong") as fast as possible.

Most of the time ftdi_sio can process the "ping pong" within one full speed 1ms USB frame.

The libftdi library, on average, takes three ms per "ping pong".

I suspect the reason for the difference in performance is due to the fact that my use of ftdi_sio involves non-blocking, CPU gobbling read operations from within a while loop while libftdi appears to use some kind of CPU-friendly blocking read.

Source attached for those interested.

Chris