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Add more command line options for RTL and shutdown improvement. #109

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Add more command line options for RTL and shutdown improvement. #109

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Commits on Jan 22, 2021

  1. Limit PPM values [-100 to 100] and allow negative values to be used. 

    Add RTL device selection using supplied command line option. e.g. -o RTL:0.
Will parse command line option '-o RTL:0' when using RTL input device to extract RTL device index.
    thewraith2008 committed Jan 22, 2021
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  2. Fix program exit (CTRL-C) when using RTL device. 

    The use of 'static volatile' keyword for 'exitflag' causes the program to halt on call to:
- pthread_join(demod.thread, NULL); (in cleanup_rtlsdr_stream)
When 'exitflag' is set in sigfun(), the change is never seen in the demod thread causing it to never to exit.

On CTRL-C, do RTL cleanup/shutdown if needed.
    thewraith2008 committed Jan 22, 2021
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  3. Compile tested on wrong repo and missed this one thing.

    thewraith2008 committed Jan 22, 2021
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