#!/usr/bin/python

#        fnordlicht serial2i2c client script
#
#    for additional information please
#    see http://koeln.ccc.de/prozesse/running/fnordlicht
#
# (c) by Alexander Neumann <alexander@bumpern.de>
#    and Lars Noschinski <lars@public.noschinski.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# For more information on the GPL, please go to:
# http://www.gnu.org/copyleft/gpl.html


from select import select
from os import fdopen
from sys import stdin
from tty import setcbreak

colors = [ [5,0,0x20,200,000,000],
           [5,0,0x20,000,200,000],
           [5,0,0x20,000,000,200],
           [5,0,0x20,255,255,255]
         ]

colorpointer = 0

if __name__ == "__main__":
    # current bus command
    buscmd = ""
    # current keyboard command
    inputcmd = ""

    # open connection to the converter
    bus = open("/dev/ttyUSB0", "r+", 0)

    # disable line-buffering
    setcbreak(bus.fileno())
    setcbreak(stdin.fileno())

    # multiplex io with stdin
    inl = [bus, stdin]
    while 1:
        # select over all fds
        inf, ouf, erf = select(inl, [], [])

        # check every fd for a change
        if bus in inf:
            c = bus.read(1)
            if ord(c) < 32:
                print "received 0x%x" % ord(c)
            else:
                print "received '%0s'" % c

            buscmd += c
            while len(buscmd) >= 2:
                if buscmd[:2]== "bp":
                    print "bootloader detected, starting main application"
                    bus.write('X')
                elif buscmd[:2] == "bc":
                    print "main application has started"
                elif buscmd[0] == "T":
                    if ord(buscmd[1]) == 0x18:
                        print "client answers (0x%x)" % ord(buscmd[1])
                    elif ord(buscmd[1]) == 0x20:
                        print "no client responded (0x%x)" % ord(buscmd[1])
                    elif ord(buscmd[1]) == 0x28:
                        print "client ack'ed databyte (0x%x)" % ord(buscmd[1])
                    elif ord(buscmd[1]) == 0x30:
                        print "databyte has been nack'ed (0x%x)" % ord(buscmd[1])
                    else:
                        print "TWI interrupt, new status: 0x%x" % ord(buscmd[1])
                elif buscmd[0] == "D":
                    print "Databytes left: %i" % ord(buscmd[1])
                elif buscmd[0] == "A":
                    print "TWI start transmitted, sending address: 0x%x" % ord(buscmd[1])
                elif buscmd[0] == "I":
                    print "TWI transmission started: flags 0x%x" % ord(buscmd[1])
                elif buscmd[0] == "F":
                    print "TWI no data bytes left, sending stop signal"
                elif buscmd[0] == "X":
                    print "TWI unknown code: 0x%x" % ord(buscmd[1])
                else:
                    print "unknown command sequence: (0x%x, 0x%x)" % (ord(buscmd[0]), ord(buscmd[1]))

                buscmd = buscmd[2:]

        elif stdin in inf:
            inputcmd += stdin.read(1)

            if inputcmd == "-":
                print "-" * 76
            elif inputcmd == " ":
                print "colorpointer: %i" % colorpointer
                for b in colors[colorpointer]:
                    bus.write(chr(b))
                colorpointer += 1
                if colorpointer == len(colors):
                    colorpointer = 0
            else:
                bus.write(inputcmd)

            inputcmd = ""