libftdi Archives

Subject: Re: background read

From: Martin Zenzes <mzenzes@xxxxxxxxxxxxxxxxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Tue, 06 Jul 2010 11:21:24 +0200
Hi Anton,

I'm working on a similar project in the moment using libftdi.

My task is to create a "clk" signal as an output (asynchronous write)
and sample the state of an input pin. "Asynchonous BitBang Mode" to be
more precise...

So far I got a continous write using a second thread (asynch write,
configure libftdi with according switch). The reading creates some
problems in the moment, but I'm after it... I don't exactly know how to
arrange the function calls, and getting a deadlock while writing if i
read in parallel after a few seconds in libusb-1.0. Writing alone works
like a charm (2.35mhz clk from 10mhz basesignal, with ~10% jitter. Does
someone know of a faster basesignal possible?)

If you want you can have a look at my code in -- maybe this could help you. I'm
using the Signalyzer H2 dongle with an ft2232h.

Actually, I tried fastftdi yesterday in the evening with instantly good
results ;-) but no final resumee...


Am Dienstag, den 06.07.2010, 07:46 +0600 schrieb Anton A. Litvinov:
> Hello
> I am writing a program that should
> a) continuously read data from FTDI-port in the background and store
> it into file.
> b) receive some commands from stdin and do appropriate writes into FTDI-port
> Questions
> 1.
> can a) and b)  run in different threads or
> I should place read and write into a cycle in one thread and
> read(stdin) -- in another ?
> and establish link beetween one to another by means of queue (fifo) ?
> 2.
> or maybe I should use some kind of non-blocking read ?

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