libftdi Archives

Subject: Use of ftdi-sio and libftdi on different interfaces of the same instance of FT4232 (and similar)

From: Ales Teska <ales.teska@xxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Thu, 30 Sep 2010 11:52:04 +0200

I'm working on a project that make use of FT4232 chip. The design says that 
some of the FT4242 ports will be connected to things like GSM modem and GPS 
devices and some will be using MPSSE for bit banging purposes. Whole thing is 
running on the Linux with quite decent Linux kernel (2.6.34).

Now problem is that obviously it is not possible today to configure ftdi-sio a 
libftdi to share same USB device. Right?
I assume that if ftdi-sio 'locks' USB device, then it is not possible to speak 
with that thru libusb/libftdi.

We will probably lucky enough with our project as we have 2 FT4232 chips and we 
can reshuffle design to move read RS232 connections to one chip and other use 
for bit banging. But is the a way or a plan to change this? It is possible to 
split device use this way on Windows and with vendor D2XX library (on Linux 
they have the same issue).

Thank you,
Ales Teska

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