#!/usr/bin/python3

#

# This script will create a pseudo terminal, and send dummy data over

# it for testing purposes. Note that pseuodo terminal is a unix thing,

# this script will not work on Windows.

#

# Currently this script only outputs ASCII(comma separated) data.

#

# Copyright © 2015 Hasan Yavuz Özderya

#

# This file is part of serialplot.

#

# serialplot is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# serialplot is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with serialplot.  If not, see <http://www.gnu.org/licenses/>.

#

import os, pty, time

def ascii_test(port):

    """Put ASCII test data through pseudo terminal."""

    print("\n")

    nc = 4 # number of channels

    for i in range(0, 1000):

        data = []

        for ci in range(0, nc):

            data.append(i*(ci+1))

        data = ",".join([str(num) for num in data])

        print("<< " + data, end="\r")

        os.write(port, bytes(data + "\r\n", 'ASCII'))

        time.sleep(0.1)

def run():

    # create the pseudo terminal

    master, slave = pty.openpty()

    master_name = os.ttyname(master)

    slave_name = os.ttyname(slave)

    print("Master terminal: {}\nSlave terminal: {}".format(master_name, slave_name))

    try:

        ascii_test(master)

    finally:

        # close the pseudo terminal files

        os.close(master)

        os.close(slave)

if __name__=="__main__":

    run()