[Ftdi-usb-sio-devel] low bandwidth with usb to serial converter running ftdio_sio

[Valentin K. <val...@go...>]

Hello ftdi-usb-sio-devel mailing list readers,

for you to know first, i am not a driver or kernel developer. I am
working at the Karlsruhe Institute for Technology in Germany on a
project concerning the measurement of the power consumption of small
sensoring computers.

For this purpose we are using a usb to serial converter to transfer data
from the measuring device to a serial console running on linux. The
converter is running with the ftdio_sio driver.

Everything is working great when the corresponding serial console
programm (i tried some) runs on 576000 baud or less. Trying to improve
the data throughput i wanted to run the device at 1152000 baud. But at
this speed i can only receive data, the data which i sent is not
recognized by the device. (I cannot run the device with baudrates
between 576000 and 1152000 because of the processor running on it (18
MHZ Atmel)

Now at this point you might wonder why the hell i am writing to this
list :D - I tried to find out where the problem might be, so i connected
the device with windows running on the same machine - it was working
well with 1152000 baud. And to try some more i did the same with windows
running within virtual box on linux - was also working. So it is
possible that the problem does not lie in the device nor the parts of
linux which are used by windows within virtual box. 

Is it possible that the driver is not working correctly? Where would you
look for the reason?

(I know i did not provide many information, but in case someone is
interested in my case i can provide more :D)

Many thanks in advance

Valentin Kautz