raw_keyboard.py

Most satellite dish actuators send a series of pulses to indicate their position. By counting pulse

# Get the keyboard into raw mode.

import termios, sys, os,fcntl


def UnBlock(fd) :
  fl = fcntl.fcntl(fd, fcntl.F_GETFL, 0)
  fl |= os.O_NONBLOCK
  fcntl.fcntl(fd, fcntl.F_SETFL, fl)


class UnixKeyboard :
  "Raw input for the duration of the importer"
  def __init__(self) :
    self.fd = sys.stdin.fileno()
    UnBlock(self.fd)
    self.old = termios.tcgetattr(self.fd)
    new = termios.tcgetattr(self.fd)
    new[3] = new[3] & ~termios.ICANON & ~termios.ECHO
    new[6][termios.VMIN] = 1
    new[6][termios.VTIME] = 0
    termios.tcsetattr(self.fd, termios.TCSANOW, new)
  def getch(self):
    ret = ""
    try :
      ret = os.read(self.fd, 1)
    except OSError, info :
      if info.errno==11 :
        pass
      else :
        raise sys.exc_type, sys.exc_value
    return ret
  def __del__(self) :
    import termios
    termios.tcsetattr(self.fd, termios.TCSAFLUSH, self.old)


Keyboard = UnixKeyboard()


if __name__ == "__main__" :
  
  print "Running key echo program"
  while True :
    b = Keyboard.getch()
    sys.stdout.write(b)
    sys.stdout.flush()