[Voyage-linux] FTDI USB Serial Device converter disconnected

[Jordi Soucheiron]

You'll have to manage this kind of exceptions. Using udev to create a link
to the last ttyUSBX device created could be useful. I use rules like this
freqüently:
KERNEL=="ttyUSB[0-9]*" , SUBSYSTEMS=="usb", ATTRS{idVendor}=="0403" ,
ATTRS{idProduct}=="6001" , ATTRS{product}=="USB-RS485 Cable" ,
SYMLINK+="ftdi485"

*Jordi Soucheiron*
Software Engineer
jsoucheiron at dexmatech.com

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2011/9/5 Rainer Stratmann <RainerStratmann at t-online.de>

> Am Monday 05 September 2011 16:42:15 schrieb themrorange at gmail.com:
> > Thanks a million for the advise.
> > I'm a bit more interesting debugging the problem and understanding what
> is
> > the cause of the disconnection. Indeed, the USB device disconnects from
> > ttySB0 and reconnects automatically to ttyUSB1. The problem is that
> during
> > the time when the device disconnects and reconnects I lose precious data
> so
> > I'm trying to avoid disconnections. Any other idea?
> Even if everything is ok it MAY BE some times that the device will
> disconnect
> (for what reason ever). And then it would be good also to have a automatic
> reconnect in your software. I have it.
> What USB serial device do you have?
> Best regards, Rainer
> > Thanks
> > Davide
> >
> > On 5 Sep 2011, at 15:17, Rainer Stratmann wrote:
> > > You can close ttyUSB0 and open ttyUSB1 if you detect a disconnect.
> > > You can detect on which usb port a FTDI Chip is connected.
> > >
> > > /sys/bus/usb/drivers/x-x:x.x/ttyUSBx
> > >
> > > x is various.
> > >
> > > Am Monday 05 September 2011 16:06:00 schrieb themrorange at gmail.com:
> > >> Hi,
> > >>
> > >> I'm using Alix 2D3 and Voyage 0.7.5, and I'm facing a nasty problem
> with
> > >> the USB. I have a device connected by USB and I have to read
> information
> > >> from that device continuously for few months. For some reason, after a
> > >> while, the USB disconnects!!! Happened many times already and always
> > >> after a random period of time (few hours or few days).
> > >>
> > >> Has anybody of you had similar problem?
> > >>
> > >> As you can see below, from my dmesg output, the USB went off after
> more
> > >> than 2 days of activity!
> > >>
> > >> [   62.583495] device tun0 entered promiscuous mode
> > >> [181469.402683] hub 1-0:1.0: port 1 disabled by hub (EMI?),
> > >> re-enabling... [181469.403667] usb 1-1: USB disconnect, address 2
> > >> [181469.406021] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now
> > >> disconnected from ttyUSB0
> > >> [181469.406654] ftdi_sio 1-1:1.0: device disconnected
> > >> [181469.627963] usb 1-1: new full speed USB device using ohci_hcd and
> > >> address 3 [181469.777676] usb 1-1: configuration #1 chosen from 1
> choice
> > >> [181469.783296] ftdi_sio 1-1:1.0: FTDI USB Serial Device converter
> > >> detected [181469.784171] usb 1-1: Detected FT232BM
> > >> [181469.785634] usb 1-1: FTDI USB Serial Device converter now attached
> > >> to ttyUSB1
> > >>
> > >> I google it a bit but I have not found solution yet
> > >>
> > >> Any comment is more than welcome
> > >>
> > >> Many thanks
> > >> Davide
> > >> _______________________________________________
> > >> Voyage-linux mailing list
> > >> Voyage-linux at list.voyage.hk
> > >> http://list.voyage.hk/mailman/listinfo/voyage-linux
> > >
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>
>
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