>>>>> "Rob" == Rob Coker <rcoker@xxxxxxxxxxxxx> writes:
Rob> I'm trying to communicate to a device that uses an FTDI 232 chip
Rob> from a Gumstix Airstorm Overo COM (Cortex-A8 CPU) on a custom base
Rob> board using meta-embedded as the Linux distro. I built/installed
Rob> libftdi for this. I already had libusb 1.x installed. When I
Rob> connect the device, it shows up in lsusb. I'm able to use libusb
Rob> calls to open it and query the serial number. All that works.
Rob> When I send data, it seems to be successful (no error on libusb
Rob> transfer call, bytesWritten is correct), but receiving data is not.
Rob> All I get is the 2 modem status bytes back which libftdi seems to
Rob> always return. At one point I received a partial message that was
Rob> correct, but the last byte or two of the message was dropped.
Rob> I am pretty sure about my endpoints and transfer mode based on the
Rob> output of lsusb -v.
Rob> I have a number of related questions: 1. Is there an
Rob> incompatibility between libusb and libftdi? Particularly this
Rob> could center around libftdi returning modem status and libusb
Rob> thinking that's the whole message to receive. Is there a way
Rob> around this?
Rob> 2. Would going to libftdi 1.2 fix anything? 3. Would it make sense
Rob> to interact with libftdi directly?
Rob> 4. I can get lots of libusb debug info. Is there a way to get
Rob> libftdi specific debug info when making calls through libusb?
Rob> Some of these questions may be better for the libusb forum, but
Rob> this seemed the best place to start. I've also posted on the
Rob> gumstix forum.
Did you check the physical layer on the TX/RX lines. Are there signals
as you expected? Can you decode with a logic analyser?
Otherwise recent libftdi also uses libusb, but libftdi was not updated for
about 3 years with update intentions denied. So newer parts are not
supported.
But if things don't work one way, trying another way may be an option.
Bye
--
Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
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