So I went and talked to some hardware people, and it was a very circular
conversation. So she's going to look into the schematics in a bit, but she
wouldn't believe me though. It works on windows it can't be a hardware issue. I
kept trying to explain to her that identical code on linux will not toggle the
chip select.
I'm not sure of the pins, but if using libMPPSSE I configured it using dbus3. I
don't actually know what pin that is or how to explicitly configure the pin for
CS on libftdi yet.
-----Original Message-----
From: bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[mailto:bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, September 10, 2013 10:56 AM
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Subject: Re: strange chip select issue
>>>>> "Chaves," == Chaves, Kevin <kevin.chaves@xxxxxxxxxxxxxxxx> writes:
Chaves,> So I’m having an incredibly strange problem using an ft2232h
Chaves,> device. We have two different boards each have the same
Chaves,> circuitry surrounding the ftdi device. For some reason on
Chaves,> linux I can’t toggle the chip select on one of them using
Chaves,> libftdi. Neither work using the libMPSSE/d2xx drivers provided
Chaves,> in linux. They work in windows using the libMPSSE/d2xx drivers,
Chaves,> which doesn’t help me much since they are bound for embedded
Chaves,> linux products. The strange part about this I original got it
Chaves,> to work with both using libMPSSE/d2xx. And worse all the
Chaves,> signals look perfect apart from the cs never being toggled.
Do the two boards perhaps have different EEPROMs? Is the chip or at least the
CS pin perhaps broken or bad soldered? Been there, done that ;-)
Chaves,> We moved to libftdi because it’s easier to produce arm
Chaves,> binaries. I borrowed code from
Chaves,> https://code.google.com/p/libftdispi/ . I’m still not quite
Chaves,> sure if I’m selected the right dbus for the chip enable. I’m
Chaves,> not quite sure how to do it using libftdi or the libftdispi I’m
Chaves,> using.
Chaves,> Any help would be much appreciated. I’m completely lost and
Chaves,> would be happy to share the source code we are using for
Chaves,> initializing and using the spi device. I’m about ready to
Chaves,> throw my PC out the window… I’m down to using a usb trace to
Chaves,> figure out the difference in signals being sent but so far it’s
Chaves,> kind of useless.
Come back for more hints if the hint above doesn't help. B.t.w. what pin causes
the headach?
Bye
--
Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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