Charles Tritt / Mbed 2 deprecated ForLoopIteration2

Move a lighted bar back and forth on an LED bargraph display. Demonstrations for loops.

Dependencies:   mbed

Fork of ForLoopIteration by Charles Tritt

main.cpp@1:4d725d785ea6, 2017-09-21 (annotated)

Committer:
CSTritt
Date:
Thu Sep 21 20:43:08 2017 +0000
Revision:
1:4d725d785ea6
Parent:
0:9475544275a6 
My initial version. Alternative to the approach used in ForLoopIteration.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 0:9475544275a6 1 /*
CSTritt 1:4d725d785ea6 2 Project: ForLoopIteration2
CSTritt 0:9475544275a6 3 File: main.cpp
CSTritt 0:9475544275a6 4
CSTritt 0:9475544275a6 5 Demonstrates the use of a for() loop. Lights multiple LEDs in sequence, then
CSTritt 1:4d725d785ea6 6 in reverse. Uses alternative approach to that used in ForLoopIteration.
CSTritt 0:9475544275a6 7
CSTritt 0:9475544275a6 8 The circuit:
CSTritt 0:9475544275a6 9
CSTritt 0:9475544275a6 10 Bargraph LEDs from pins 2 through 11 to ground via 330 Ohm resistors.
CSTritt 0:9475544275a6 11
CSTritt 0:9475544275a6 12 Created 2006
CSTritt 0:9475544275a6 13 by David A. Mellis
CSTritt 0:9475544275a6 14 Modified 30 Aug 2011
CSTritt 0:9475544275a6 15 by Tom Igoe
CSTritt 0:9475544275a6 16 Modified for Nucleo / mbed 12 Aug 2017
CSTritt 0:9475544275a6 17 by Sheila Ross
CSTritt 0:9475544275a6 18 Modified by C. S. Tritt 9/21/17 (v. 1.0)
CSTritt 0:9475544275a6 19
CSTritt 0:9475544275a6 20 This example code is in the public domain.
CSTritt 0:9475544275a6 21 */
CSTritt 0:9475544275a6 22
CSTritt 0:9475544275a6 23 #include "mbed.h"
CSTritt 0:9475544275a6 24
CSTritt 0:9475544275a6 25 float delay = 0.1; // Seconds, the higher the number, the slower the rate.
CSTritt 0:9475544275a6 26
CSTritt 0:9475544275a6 27 BusOut bar_graph(D2,D3,D4,D5,D6,D7,D8,D9,D10,D11);
CSTritt 0:9475544275a6 28
CSTritt 0:9475544275a6 29 int main() {
CSTritt 0:9475544275a6 30
CSTritt 0:9475544275a6 31 while(true) { // Keep the lights going back and forth forever.
CSTritt 0:9475544275a6 32
CSTritt 1:4d725d785ea6 33 // Shift bar from 0 to 9 places. 1 << 9 is 2 to the 10th power.
CSTritt 1:4d725d785ea6 34 for(int lights = 1; lights <= (1<<9); lights = (lights << 1)) {
CSTritt 1:4d725d785ea6 35 bar_graph = lights; // Shifting rather than incrementing in for.
CSTritt 0:9475544275a6 36 wait(delay); // Pause
CSTritt 0:9475544275a6 37 }
CSTritt 0:9475544275a6 38
CSTritt 0:9475544275a6 39 // Now shift down from 9 to 0 places.
CSTritt 1:4d725d785ea6 40 for(int lights = (1<<9); lights >= 1; lights = (lights >> 1)) {
CSTritt 1:4d725d785ea6 41 bar_graph = lights; // Shifting rather than incrementing in for.
CSTritt 0:9475544275a6 42 wait(delay); // Pause
CSTritt 0:9475544275a6 43 }
CSTritt 0:9475544275a6 44 }
CSTritt 0:9475544275a6 45 }