libftdi Archives

Subject: Re: [libftdi 0.18] SPI with CBUS Bit-banging FT232H

From: Uwe Bonnes <bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Mon, 4 Jul 2011 18:54:20 +0200
>>>>> "Alex" == Alex Stefan <alexandru.stefan@xxxxxxxxxxx> writes:

...
    Alex> I have talked to the developers of FTDI lipspi and they said that
    Alex> their current version only supports MPSSE SPI, not bit-banging.

Perhaps of bad performance?

    Alex> Could you please offer some more details on the USB timing? 

Google "usb frame" offers me (german) explanations on:
http://de.wikipedia.org/wiki/Universal_Serial_Bus

    Alex> How
    Alex> can I set the interval between 2 USB frames (from 1ms to 125 uS) ?

Supposed you run on linux or a similar system:

strace -ttt -f -o <logfile> <your_program>

-- 
Uwe Bonnes                bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------

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