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Re: [Discuss-gnuradio] beginning psk31

From: Chuck Swiger
Subject: Re: [Discuss-gnuradio] beginning psk31
Date: Tue, 05 Apr 2005 18:08:34 -0400

At 12:43 PM 4/2/2005 -0800, you wrote:

Is typical psk31 usage to buffer up a line using readline or its
equivalent, and then send it?  If so, you might want to create a
source that did a non-blocking read on the tty, or readline, or gui,
or whatever, and return the data it got or an indication that there's
no data to send.  For full 8-bit transparency, you might want to have

There's an interesting mechanism to poll I/O using module "select",
you can register a file descriptor and poll it with a timeout that either
returns an empty list or a tuple with (fd, event). Example usage:

import sys,tty,select
fd = sys.stdin.fileno()
while 1:
        p=a.poll(320) # wait 320mSec, aboutt 1 char at 31.25 baud
        print p
        if p==[(fd, 1)]:
          ch = sys.stdin.read(1)
          print ch,

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