latch.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
#  Logic Circuits - latch.py
#
#  Copyleft 2015 Chris Meyers <chris.meyers47@gmail.com> 2015.12.13
#
#  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 2 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, write to the Free
#  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
#  Boston, MA 02110-1301, USA.
#

__author__     = "Chris Meyers, Jeff Elkner and Kevin Cole"
__copyright__  = "Copyleft 2015, Chris Meyers (2015.12.13)"
__credits__    = ["Chris Meyers", "Jeff Elkner",
                  "Kevin Cole"]  # Authors and bug reporters
__license__    = "GPL"
__version__    = "2.0"
__maintainer__ = "Chris Meyers, Jeff Elkner, Kevin Cole"
__email__      = "kevin.cole@novawebcoop.org"
__status__     = "Development"  # "Prototype", "Development" or "Production"
__appname__    = "Logic Circuits"

import pygame as pg
from   gates     import Puls, Nand2
from   circuit   import Circuit
from   connector import Connector


class Latch(Circuit):
    def setupGraphics(s):
        n1  = Nand2(s, "N1", s.scale1((10,  0)))        # Upper Nand
        n2  = Nand2(s, "N2", s.scale1((10, 50)))        # Lower Nand
        # external connectors. Same depth as latch circuit
        s.A = Connector(s, "A", ((n1.A.x(-10), n1.A.y())))
        s.B = Connector(s, "B", ((n2.B.x(-10), n2.B.y())))
        s.Q = Connector(s, "Q", ((n1.C.x(  2), n1.C.y())))
        s.output = s.Q

        if s.encapsulated():
            s.A.pos, s.B.pos, s.Q.pos = s.scaleM((0, 8), (0, 32), (20, 20))
        s.n1 = n1
        s.n2 = n2
        s.gates = (n1, n2)

        s.A.addWire(n1.A)
        s.B.addWire(n2.B)
        c1 = (n1.C.x( 10), n1.C.y(   ))   # zig-zag output to input
        c2 = (n1.C.x( 10), n1.C.y( 10))
        c3 = (n2.A.x(-10), n2.A.y(-10))
        c4 = (n2.A.x(-10), n2.A.y(   ))
        n1.C.addWire(c1, c2, c3, c4, n2.A)
        n1.C.addWire(s.Q)

        c1 = (n2.C.x( 10), n2.C.y(   ))    # zig-zag the other way
        c2 = (n2.C.x( 10), n2.C.y(-10))
        c3 = (n1.B.x(-10), n1.B.y( 10))
        c4 = (n1.B.x(-10), n1.B.y(   ))
        n2.C.addWire(c1, c2, c3, c4, n1.B)


class TestLatch(Circuit):
    def setupGraphics(s):
        s.banner = "Basic Latch Circuit"
        latch = Latch(s, "L1", s.scale1((50, 30)))
        p1 = Puls(s, "P1")  # pulsars left and down
        p2 = Puls(s, "P2")
        p1.align(p1.B, latch.A, -25, 0)
        p2.align(p2.B, latch.B, -25, 0)
        s.gates = (p1, p2, latch)
        p1.B.addWire(latch.A)
        p2.B.addWire(latch.B)
        s.led1 = Connector(s, "LED1", (latch.Q.x(20), latch.Q.y()))
        latch.Q.addWire(s.led1)

if __name__ == "__main__":
    import gameloop
    from   settings import CmdScale
    circuit = TestLatch(None, "TestLatch", (100, 100), scale=CmdScale)
    gameloop.gameloop(circuit)