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#!/usr/bin/env python

#------------------------------------------------------------------------------#

# Serial Upload Tool                                                           #

#------------------------------------------------------------------------------#

# Uses pySerial visit [1] for the module.                                      #

#                                                                              #

# REFERENCES                                                                   #

#  [1] pySerial, http://pyserial.sourceforge.net/                              #

#  [2] Fabio Varesano, http://www.varesano.net/blog/fabio/                     #

#      serial%20rs232%20connections%20python                                   #

#------------------------------------------------------------------------------#

# Copyright (C) 2011 Mathias Hoertnagl, mathias.hoertnagl@gmail.com            #

#                                                                              #

# This program 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.                                                           #

# This program 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 #

# this program; if not, see <http://www.gnu.org/licenses/>.                    #

#------------------------------------------------------------------------------#

import sys, struct, time

import serial

if len(sys.argv) != 2:

   print "Usage: python", sys.argv[0], "<*.bin file>"

   sys.exit()

# Set up serial port object.

s = serial.Serial(

   port = 4, # 'COM5',

   baudrate = 19200

)

# Load binary file.

inp = open(sys.argv[1], 'rb')

bin = inp.read()

inp.close()

print ""

print "************************************************************************"

print "* Upload                                                               *"

print "************************************************************************"

size = len(bin)

print "File size of '{0}' is: {1} bytes.".format(sys.argv[1], size)

if s.isOpen():

   s.write(struct.pack('>I', size))

   # void echoes the image size, after it has erased the flash.

   # Check if it is the correct size.

   esize = struct.unpack('>I', s.read(4))[0]

   if esize != size:

      print "ERROR: Size echo is {0}. Expected: {1}.".format(esize, size)

      sys.exit()

   print "Flash ready. Size echo correct."

   print "Sending data ..."

   # NOTE: Writing the entire file with s.write(bin) does not work. Possibly

   #       due to limited buffer size.

   for c in bin:

      s.write(c)

   s.close()

   print "Done!"