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

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

--- On Mon, 11/22/10, Chris Stankevitz <chr...@ya...> wrote:
> However, your implication that multiple reads would help
> got me excited.
>
> There is also something called a libftdi streaming read

Michael,

A "streaming read" is what you proposed earlier -- a method for submitting multiple async read requests.  Strangely, the performance is the same if you have 1 pending read or 100.  I'm going to learn more about this.  

Ping-pong rates:

ftdi_sio: 1000 Hz (but about 2 seconds of every 10 has degraded performance ~500Hz)

libftdi-1.0 using synchronous read: 500 Hz

libftdi-1.0 using asynchronous read (1 pending): 500 Hz

libftdi-1.0 using asynchronous read (>1 pending): Impossible

libftdi-1.0 using streaming read (1 pending): 1000 Hz consistently

libftdi-1.0 using streaming read (>1 pending): 1000 Hz consistently

Thank you,

Chris