Revision 2:819a248bbe75, committed 2017-09-13

Comitter:

CSTritt

Date:

Wed Sep 13 18:33:44 2017 +0000

Parent:

1:3efb8a158c32

Commit message:

Initial version. Demonstrates PwmOut.

Changed in this revision

--- a/main.cpp	Fri Sep 08 15:13:21 2017 +0000
+++ b/main.cpp	Wed Sep 13 18:33:44 2017 +0000
@@ -1,48 +1,38 @@
 /*
- Fade
+ Project: Fade
+ File: main.cpp
+ Last revised by: Dr. C. S. Tritt
+ Revision date: 9/13/17 (v. 1.0)
  
- This example shows how to fade an LED on pin 9
- using PWM.
+ This example shows how to fade an LED on pin D15 using PWM.
  
  This example code is in the public domain.
  */
-
 #include "mbed.h"
-
 // Similar to DigitalOut, you can declare a pin to flicker on and off
 // at a desired frequency and duty cycle using PwmOut. 
-
-PwmOut my_LED(D9);
+PwmOut my_LED(D15); // Construct my PwmOut object.
 
-// Create variables to control the fading:
-
+// Create variables to control brightness and fading:
 float fadeAmount = 0.05;  
 float brightness = 0;
 
 int main()  { 
-
-    while(1) {
+    while(true) {  
+       
+        // The LED brightness is set by writing a value between 0.0 and 1.0.
+        // This sets the duty cycle (0.5 = 50%, etc.).
         
-        // Set the brightness of the LED by writing a value between 0 and 1
-        // to my_LED.  This sets the duty cycle (0.5 = 50%, etc.)
-
-        my_LED = brightness;
-
-        // Change the brightness for next time through the loop:
-   
-        brightness = brightness + fadeAmount;
-
+        my_LED = brightness; // Set brightness.      
+        brightness = brightness + fadeAmount;  // Change for next time through.
+        
         // Reverse the direction of the fading at the ends of the fade.
         // It's hard for floats to be exactly equal, so reverse if we hit
         // or go past full dark or full bright.
-   
-        if (brightness <= 0 || brightness >= 1) {
-            fadeAmount = -fadeAmount ;
-        }
         
-        // Wait for 30 milliseconds to see the dimming effect
-   
-        wait(0.03);
-   
+        if (brightness <= 0 || brightness >= 1) { // Reverse at limits.
+            fadeAmount = -fadeAmount ; // Reverse fade direction.
+        }  
+        wait(0.03); // Wait for 30 milliseconds to see the dimming effect .
     }
-}
+}
\ No newline at end of file

--- a/mbed.bld	Fri Sep 08 15:13:21 2017 +0000
+++ b/mbed.bld	Wed Sep 13 18:33:44 2017 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/fd96258d940d
\ No newline at end of file
+http://mbed.org/users/mbed_official/code/mbed/builds/a330f0fddbec
\ No newline at end of file