Re: [Discuss-gnuradio] pySerial and GNU Radio

[Josh Blum]

I remember needing to call os.dup() or os.dup2() on the serial device's 
file descriptor, and passing that new file descriptor to the file 
source. Hope that helps! -Josh

On 01/13/2010 01:35 PM, address@hidden wrote:
> Hi there Gurus of Software Defined Radio Heaven,
>
> I have been trying to get pySerial and GNU Radio to work together but only
> with limited success. The goal is to read data from a serial connection,
> say '/dev/ttyUSB0', and use it to calculate the bit error rate.
>
> I'm using pySerial in GNU Radio the following way,
>
>     [...]
>     self.ser = serial.Serial('/dev/ttyUSB0')
>     self.src = gr_file_descriptor_source(gr.sizeof_char, self.ser.fileno(),
> False)
>     [...]
>
> If I put a self.ser.readline() in there somewhere (before calling Run())
> the next line is read correctly from the serial connection.
>
> When I connect a file_descriptor_source with both a file_sink and a
> scope_sink the result is that the file contains the correct data, no
> problem, but the scope_sink just never gets updated. No errors, no
> nothing. When I change the repeat parameter to true, I get a 'lseek'
> Invalid seek error.
>
> Any ideas on how to get it working?
>
> - Martin
>
>
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