[Discuss-gnuradio] pySerial and GNU Radio

[s042353]

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