Issues in Using File Source

GNU Radio
1

Greetings to all,

I am trying to send a bit stream “1110011” using file source. For that,
I
created a bin file using “gedit”, typed 1110011 in it and saved it.
After
that, I gave the path of bin file in GRC File source block and connected
a
scope to it. But when I ran the file, It gave zero at the output…

Am I making the bin file in a wrong way?? Please Help…

Regards
Salman D.

2

Hello Salman,

gedit is a text editor; 1110011 is a sequence of characters, not of
bits; then, even if you count the 7 bytes, that would be an extremely
short signal, no matter how you configured the file source to interpret
the contents of your file.
If you, for example, set the file source to “complex”, it will interpret
the bytes in your file as pairs of 32bit floats – that would be 8 byte
for one complex number. With your 7 byte long file, the file source
would not produce a single item of output, and your flow graph would
stall for the lack of input.

Generally, there’s a FAQ entry about the file “format” the file
sink/source use [1].
I never cease to recommend the new guided tutorials [2], which (I hope)
will give GNU Radio beginners a bit of intuitive insight on how GNU
Radio deals with input, item streams, and sample types.

Greetings,
Marcus

[1]
http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#What-is-the-file-format-of-a-file_sink-How-can-I-read-files-produced-by-a-file-sink
[2] https://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials

3

Thanks Marcus. It helped alot :slight_smile:

Regards
Salman D.

On Mon, Jan 19, 2015 at 5:44 PM, Marcus Müller
[email protected]