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+/*
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+ * piGlow1.c:
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+ * Very simple demonstration of the PiGlow board.
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+ * This uses the piGlow devLib.
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+ *
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+ * Copyright (c) 2013 Gordon Henderson.
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+ ***********************************************************************
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+ * This file is part of wiringPi:
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+ * https://projects.drogon.net/raspberry-pi/wiringpi/
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+ *
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+ * wiringPi is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU Lesser General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * wiringPi is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU Lesser General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Lesser General Public License
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+ * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
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+ ***********************************************************************
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+ */
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+
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <poll.h>
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+
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+#include <wiringPi.h>
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+#include <piGlow.h>
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+
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+#define PIGLOW_BASE 533
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+
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+
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+/*
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+ * keypressed: clearKeypressed:
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+ * Simple but effective ways to tell if the enter key has been pressed
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+ *********************************************************************************
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+ */
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+
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+static int keypressed (void)
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+{
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+ struct pollfd polls ;
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+
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+ polls.fd = fileno (stdin) ;
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+ polls.events = POLLIN ;
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+
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+ return poll (&polls, 1, 0) != 0 ;
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+}
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+
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+static void clearKeypressed (void)
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+{
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+ while (keypressed ())
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+ (void)getchar () ;
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+}
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+
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+
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+/*
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+ * pulseLed:
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+ * Pulses the LED at position leg, ring from off to a max. value,
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+ * then off again
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+ *********************************************************************************
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+ */
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+
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+static void pulseLed (int leg, int ring)
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+{
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+ int i ;
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+
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+ for (i = 0 ; i < 140 ; ++i)
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+ {
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+ piGlow1 (leg, ring, i) ;
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+ delay (1) ;
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+ }
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+ delay (10) ;
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+ for (i = 140 ; i >= 0 ; --i)
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+ {
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+ piGlow1 (leg, ring, i) ;
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+ delay (1) ;
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+ }
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+}
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+
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+/*
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+ * pulseLeg:
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+ * Same as above, but a whole leg at a time
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+ *********************************************************************************
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+ */
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+
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+static void pulseLeg (int leg)
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+{
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+ int i ;
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+
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+ for (i = 0 ; i < 140 ; ++i)
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+ {
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+ piGlowLeg (leg, i) ; delay (1) ;
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+ }
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+ delay (10) ;
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+ for (i = 140 ; i >= 0 ; --i)
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+ {
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+ piGlowLeg (leg, i) ; delay (1) ;
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+ }
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+}
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+
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+
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+/*
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+ * pulse Ring:
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+ * Same as above, but a whole ring at a time
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+ *********************************************************************************
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+ */
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+
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+static void pulseRing (int ring)
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+{
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+ int i ;
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+
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+ for (i = 0 ; i < 140 ; ++i)
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+ {
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+ piGlowRing (ring, i) ; delay (1) ;
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+ }
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+ delay (10) ;
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+ for (i = 140 ; i >= 0 ; --i)
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+ {
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+ piGlowRing (ring, i) ; delay (1) ;
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+ }
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+}
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+
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+
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+/*
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+ * main:
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+ * Our little demo prgoram
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+ *********************************************************************************
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+ */
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+
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+int main (void)
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+{
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+ int i ;
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+ int ring, leg ;
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+
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+// Always initialise wiringPi:
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+// Use the Sys method if you don't need to run as root
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+
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+ wiringPiSetupSys () ;
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+
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+// Initialise the piGlow devLib with our chosen pin base
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+
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+ piGlowSetup (PIGLOW_BASE) ;
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+
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+// LEDs, one at a time
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+
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+ printf ("LEDs, one at a time\n") ;
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+ for (; !keypressed () ;)
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+ for (leg = 0 ; leg < 3 ; ++leg)
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+ {
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+ for (ring = 0 ; ring < 6 ; ++ring)
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+ {
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+ pulseLed (leg, ring) ;
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+ if (keypressed ())
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+ break ;
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+ }
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+ if (keypressed ())
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+ break ;
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+ }
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+ clearKeypressed () ;
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+
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+// Rings, one at a time
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+
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+ printf ("Rings, one at a time\n") ;
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+ for (; !keypressed () ;)
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+ for (ring = 0 ; ring < 6 ; ++ring)
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+ {
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+ pulseRing (ring) ;
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+ if (keypressed ())
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+ break ;
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+ }
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+ clearKeypressed () ;
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+
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+// Legs, one at a time
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+
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+ printf ("Legs, one at a time\n") ;
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+ for (; !keypressed () ;)
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+ for (leg = 0 ; leg < 3 ; ++leg)
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+ {
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+ pulseLeg (leg) ;
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+ if (keypressed ())
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+ break ;
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+ }
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+ clearKeypressed () ;
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+
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+ delay (1000) ;
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+
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+// Sequence - alternating rings, legs and random
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+
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+ printf ("Sequence now\n") ;
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+
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+ for (; !keypressed () ;)
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+ {
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+ for (i = 0 ; i < 20 ; ++i)
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+ for (leg = 2 ; leg >= 0 ; --leg)
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+ {
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+ piGlowLeg (leg, 100) ;
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+ delay (100) ;
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+ piGlowLeg (leg, 0) ;
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+ }
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+
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+ for (i = 0 ; i < 20 ; ++i)
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+ for (ring = 5 ; ring >= 0 ; --ring)
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+ {
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+ piGlowRing (ring, 100) ;
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+ delay (50) ;
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+ piGlowRing (ring, 0) ;
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+ }
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+
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+ for (i = 0 ; i < 1000 ; ++i)
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+ {
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+ leg = random () % 3 ;
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+ ring = random () % 6 ;
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+ piGlow1 (leg, ring, random () % 256) ;
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+ delay (5) ;
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+ piGlow1 (leg, ring, 0) ;
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+ }
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+ }
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+
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+ return 0 ;
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+}
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