I am having trouble with a 232R in BITMODE_SYNCBB mode. Basically I can't
write more than 384 (exactly) bytes without reading. If I continuously read
the buffer back after writing it works but that creates timing problems for me.
I tried the same exact program on a 4232H and it works properly.
I compiled a test program against the FTDI libraries and I was able to write
16k buffers without reading on the 232R. I built the same test program against
libftdi and it still had the 384 byte limitation.
I've tried messing with many baudrates and chunksizes to no avail.
I'm using libftdi-0.19/libusb-0.1.12 on a Mac running 10.6.8 (64-bit).
I also tried the same exact code on Ubuntu 10.10 with the same result, only
instead of ftdi_write returning 0 it returns -110 (usb bulk write failed)
I tried libftdi-0.19/libusb-1.0.8 with libusb-compat and had the same result,
with ftdi_write returning -60 (usb bulk write failed)
Finally I tried libftdi-1.0 (from repo) and libusb-1.0.8 and still had the same
result, with ftdi_write returning -1 (usb bulk write failed)
The main thing that confuses me is that the "official" FTDI driver uses
libusb-1.0.8 and does not exhibit the same problem.
Does anyone have any ideas? Is there something that I'm missing?
Thanks,
Dean
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