Re: [Discuss-gnuradio] beginning psk31

[Chuck Swiger]

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()
tty.setraw(sys.stdin.fileno())
a=select.poll()
a.register(fd,select.POLLIN)
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,