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

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

--- On Tue, 11/16/10, Michael Plante <mic...@gm...> wrote:
> Again, I would suggest that you consider using a non-blocking form,
> and schedule multiple read requests.
> 
> http://developer.intra2net.com/git/?p=libftdi-1.0
> 
> Consider ftdi_read_data_submit,
> ftdi_transfer_data_done, etc.

Hello again Michael,

FYI:  I took your suggestion and tried libftdi-1.0 asynchronous calls.  My "ping pong rate" improved slightly from the synchronous calls (as you predicted), but they still are not near the ftdi_sio rates:

1. libftdi-0.1, sync read, single thread: ~300Hz

2. libftdi-0.1, sync read, reads on separate thread in an infinite loop: ~300Hz

3. libftdi-1.0, async read (as you recommended): ~500Hz

4. ftdi_sio, sync read, single thread: ~1000Hz

5. ftdi_sio, sync read, reads on separate thread in an infinite loop: ~1000Hz

Note: Operations 4 and 5 run at 1000Hz most of the time, but experience a second or two of ~500Hz rates every 10 seconds or so.

Thank you all for your help,

Chris