Diff: main.cpp

Revision:

0:1bf2c942b27f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Dec 30 19:41:45 2009 +0000
@@ -0,0 +1,60 @@
+/*
+* Cylon like sequencer for on board LEDs demo.
+*
+* Turns on LED and shifts it left to right and back again.
+*
+* Copyright (C) <2009> Tom Belpassso <tombelpasso@gmail.com>
+*
+* This 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.
+* 
+* OneWire/DS18S20 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.
+*
+* a copy of the GNU General Public License, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "mbed.h"
+// configuration equates
+// time between shifting to next LED
+#define SHIFT_TIME 0.04
+// total time for sequence
+#define REPEAT_TIME 1.0
+// blank time between sequences
+#define BLANK_TIME REPEAT_TIME - 9 * SHIFT_TIME
+
+BusOut leds(LED1, LED2, LED3, LED4);
+
+int main() {
+    // i is used to turn on first LED in the sequence
+    short i = 1;
+    bool dir = 0 ; // 0 shift left, 1 shift right
+    leds = 0;
+    while(1) {
+        if (dir)
+            leds = (leds >> 1) + i;  // shift down
+        else
+            leds = (leds << 1) + i;    // shift 
+        wait(SHIFT_TIME);
+        if (leds != 0) {  // if any leds lit, don't turn any more on
+            i = 0;
+        }
+        // see if all LEDs are off
+        if (leds == 0) {
+            // leds = 0 ;
+            if (dir) {
+                dir = 0 ;  // toggle directon
+                i = 1;        // LSB LED on next shift
+                wait(BLANK_TIME);
+            } else {
+                dir = 1;
+                i = 8;        // MSB LED on next shift
+                wait(SHIFT_TIME);
+            }
+        }
+    }
+}
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