libftdi Archives

Subject: Re: CBUS bitbang disconnects serial interface

From: "Andrew Kohlsmith (mailing lists account)" <aklists@xxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Tue, 27 Jul 2010 18:19:16 -0400
On Tuesday, July 27, 2010 05:58:21 pm DJ Delorie wrote:
> I do the same thing with my FT232RL's.  The issue is, when you grab
> the USB device with the FTDI library (or the D2xx library), you grab
> the whole device - including the serial port.  At that point, you need
> to use the libftdi API to see the serial port, not Linux's built-in
> tty driver.

> Basically, you can't have two drivers talking to the same usb device
> at the same time.

Aha... Ok. I tried unloading and reloading the module afterward and I still do 
not seem to get the serial device back. I need to pull the cable or issue a 
USBDEVFS_RESET IOCTL call to the the hub that the FT232R is connected to 
(issuing the IOCTL to the FT232R isn't enough).

I also read that the internal EEPROM must match what I tell ftdi_set_bitmode() 
call, which is a drag.

Offhand, how do you control CBUS4? There aren't enough bits in the bitmode call 
to control it.


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