Ftdi driver issue

GoogleGroups
1

Hello,

I try to plug more than one FTDI Usb Serial Adapter on a BeagleBone Black.

I tried several adapters and all work fine if plugged directly on the USB Host port.

But if I use an USB hub - I tried several - or a specific cape (http://www.titan.tw/product/USB_2COM_BB.html), the ftdi driver complains:

[ 1544.135039] ftdi_sio ttyUSB0: ftdi_set_termios FAILED to set databits/stopbits/parity
[ 1545.143074] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[ 1550.151247] ftdi_sio ttyUSB0: urb failed to clear flow control

Here comes the different cases:

BBB Usb Host > USB Cape > Ftdi Usb Serial Adapter 1

Ftdi Usb Serial Adapter 2

BBB Usb Host > USB Hub > Ftdi Usb Serial Adapter 1

Ftdi Usb Serial Adapter 2

BBB Usb Host > USB Hub > USB Cape > Ftdi Usb Serial Adapter 1

Ftdi Usb Serial Adapter 2

→ fails

BBB Usb Host > Ftdi Usb Serial Adapter 1
BBB Usb Host > USB Cape

→ works

  • Does this issue come from the Ftdi driver?

  • Is it a BBB hardware problem? (The issue is reproduced on all my four BBB)

  • Where can I send this report to the good guy?

Thank you,

Sylvain

2

how are you powering the hub? and BBB? Is it possible that you're
running out of supply current? Try a powered hub---does it make a
difference?

3

I tried with powered and not powered hub. Results are the same.
BBB is powered by its 5V adapter.