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Subject: Re: libftdi@xxxxxxxxxxxxxxxxxxxxxxx is a subscribers only list

From: Petr Jakeš <petr.jakes@xxxxxx>
To: Emmanuel Blot <eblot.ml@xxxxxxxxx>
Cc: libftdi@xxxxxxxxxxxxxxxxxxxxxxx, Vladimir Yakovlev <nagos@xxxxxxxx>
Date: Thu, 17 Mar 2011 00:01:58 +0100


There's no way to know/control how much time is spent between the
actual "execution" of two consecutive FTDI commands: clock jitter
comes from various sources: FTDI FIFOs, USB bus latency + async clock
delay (USB HW frames vs. USB stack), various software stacks, multi
tasking scheduling, etc.

If you need a precise clock, I think you should not rely on bit
banging mode at all.

Sorry I was not more specific.

We do not need 50Hz frequency.

The scenario is to send (max) 3072 bytes to the SPI and than to pull the trigger (to set LATCH ENABLE pin HI).
Above mentioned will be executed in the infinitive loop. The maximal speed to repeat the loop is about 30 to 50Hz.

Petr


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