>>>>> "lokkje" == lokkje <lokkjje@xxxxxxxxx> writes:
lokkje> Hi everybody, I have an application that's transferring large
lokkje> text files to and from an FT230X. Using the VCP driver, I've
lokkje> managed to transfer the files without any issues, but when I use
lokkje> libFTDI I'll reliably see a few hundred bytes go missing (as in,
lokkje> not appear in the data stream, no warning or anything) around
lokkje> the same place every time (within a few lines radius); the place
lokkje> where bytes are dropped varies by file, but certain files will
lokkje> reproduce it consistently.
lokkje> The application runs on OSX. I've been debugging the receive
lokkje> half of communications: I've put debug prints in
lokkje> libusb_bulk_transfer to verify it receives bad data from the OS
lokkje> (or at least the libusb/darwin stuff), and I've scoped the UART
lokkje> pins on the other side of the FTDI chip to verify it's receiving
lokkje> good data. Unfortunately I don't have a USB sniffer handy to
lokkje> check actual USB traffic.
lokkje> My standard libFTDI setup is open_desc(), followed by
lokkje> usb_reset() and purge_buffers(), then setting line properties
lokkje> and baud rate and all of that. Getting rid of usb_reset and
lokkje> purge_buffers doesn't affect anything. This happens on 1.0, and
lokkje> it also happens with top-of-tree (which has a few new FT230X
lokkje> commits it looks like, though mostly relating to eeprom and the
lokkje> clocking bug).
lokkje> Has anybody else run into this, or does anybody have ideas for
lokkje> further debugging? I tried capturing the VCP's setup sequence
lokkje> using OSX's instrumented usb driver, but between the limitations
lokkje> of instrumentation and not having great docs on the FTDI
lokkje> protocol I didn't get very far...
Can you try to reproduce with RX-TX of a FT230 connected and a libftdi
Test program you post here? I have FT230 devices and I could try to
debug. However I will be away most of the next week ...
Bye
--
Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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