Hello,
I am using libftdi to access a FTDI 2232D chip. I have two
configurations of the 2232D, in one case it is completely unmodified,
and in the other case it is configured to be used as a JTAG debug board
(http://wiki.openmoko.org/wiki/Debug_Board_v2). In both of these cases
one of the FTDI UARTs is connected to a RS-485 transceiver.
I am experiencing problems with the second case, the debug board. If I
connect the FTDI-device and try to communicate using libftdi, it does
not work. I can successfully open the device, but I cannot communicate
with my external device (over RS-485). If I print out what I read back
from the serial port I am flooded with data containing only zeroes
(nothing from the external device). After my application is finished,
the ttyUSBx device has been removed from /dev.
While troubleshooting this I discovered that if I communicate using
/dev/ttyUSBx (open(), write(), close()) it works perfectly. I also
discovered that if I use this method first, I can use the libftdi
afterwards. Upon reconnection it fails again if I try to use libftdi first.
I have tried this using libftdi-0.2 and libftdi from the git repo. Any
ideas?
//Pelle
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