#!/usr/bin/env python
# -*- coding: utf-8 -*-
#=======================================================================
#
# seriedebug.py
# -------------
# Program that sends test bytes onto the serial link and print out
# any response.
#
# Note: This proram requires the PySerial module.
# http://pyserial.sourceforge.net/
#
# 
# Author: Joachim Strömbergson
# Copyright (c) 2014 NORDUnet A/S
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
# - Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
#
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
#
# - Neither the name of the NORDUnet nor the names of its contributors may
#   be used to endorse or promote products derived from this software
#   without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#=======================================================================

#-------------------------------------------------------------------
# Python module imports.
#-------------------------------------------------------------------
import sys
import serial

    
#-------------------------------------------------------------------
# main()
#
# Parse arguments.
#-------------------------------------------------------------------
def main():
    print "Seriedebug started..."
    print

    verbose = True
    
    ser = serial.Serial()
    ser.port='/dev/cu.usbserial-A801SA6T'
    ser.baudrate=9600
    ser.bytesize=8
    ser.parity='N'
    ser.stopbits=1
    ser.timeout=1
    ser.writeTimeout=0

    # Open the interface.
    ser.open()
    if verbose:
        print "Opening device."
        
    # Send a byte and try to get the response.
    testdata = ['\xab', '\xaa', '\x00', '\x01', '\xf1', '\x0f', '\xff', '\x07']
    for tx_byte in testdata:
        ser.write(tx_byte)
        if verbose:
            print "transmitting byte 0x%02x" % ord(tx_byte)

    
    if verbose:
        print "Waiting for response..."

    for i in range(8):
        response = ""
        while not len(response):
            response = ser.read()
            if len(response):
                print "received response: 0x%02x" % ord(response)



    # Exit nicely.
    if verbose:
        print "Done. Closing device."
    ser.close()


#-------------------------------------------------------------------
# __name__
# Python thingy which allows the file to be run standalone as
# well as parsed from within a Python interpreter.
#-------------------------------------------------------------------
if __name__=="__main__": 
    # Run the main function.
    sys.exit(main())

#=======================================================================
# EOF seriedebug.py
#=======================================================================