Re: [Ftdi-usb-sio-devel] Continuous stream of characters sent by ftdi_sio driver.

[Ralph L. <suc...@ih...>]

Hi,

> when I use the 'generic' driver instead of ftdi_sio.
> 
> 1. The driver appears to be sending a constant stream of characters to
> the computer (i.e. to the machine with the USB port).  The characters
> are alternatiely 0x01 and 0x60.

The USB data packets sent by the FTDI devices all start with 2 bytes of modem status bits.  It sounds like these are what you are seeing.  The ftdi_sio driver is expected to remove them.

I would expect you to see these with the 'generic' USB serial driver, but the ftdi_sio driver definately should be stripping those off before the data gets to minicom.

Is it possible that somehow the ftdi_sio driver failed to attach and instead the generic driver was always grabbing the device?  If you haven't already, check the kernel messages in /var/log/* to make sure that the ftdi_sio driver really is being used.

> The version of the driver available on the FTDI website is very old,

My experience with ftdi devices and Linux is that it is prefereable to use the stock kernel driver, or libusb/libftdi, rather than the FTDI code.

Cheers,
Ralph.

> and contains a comment which refers to symptoms such as I am seeing.
> Unfortunately this version of the driver does not compile for 3.8.3
> and before I delve more deeply into the code I'm hoping that someone
> with more intimate knowledge of the driver will be able to point me in
> the right direction to fix it.
> 
> --
> 
> 73,
> Ged.
> 
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