Diff: main.cpp

Revision:

107:61b9c99a4e27

Parent:

105:ed03c03b353e

Child:

108:eee3167b25b4

--- a/main.cpp	Fri Nov 22 16:00:04 2019 +0000
+++ b/main.cpp	Mon Sep 20 03:01:02 2021 +0000
@@ -1,23 +1,33 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2019 ARM Limited
- * SPDX-License-Identifier: Apache-2.0
- */
-
+/*
+  21_myBlink_v5 - Turns on an LED on and off for, repeatedly.
+  Last Revised: 9/19/21 (v. 1.0)
+  Based on mbed example. Modified by Dr. C. S. Tritt. This example code is in 
+  the public domain. 
+*/
+//  #include is a directive that "pastes" a file into your code.
+//  Use this specific #include at the beginning of each mbed program.
+//  mbed.h contains/points to the full definitions of our simple statements.
 #include "mbed.h"
-#include "platform/mbed_thread.h"
-
-
-// Blinking rate in milliseconds
-#define BLINKING_RATE_MS                                                    500
-
-
-int main()
-{
-    // Initialise the digital pin LED1 as an output
-    DigitalOut led(LED1);
-
-    while (true) {
-        led = !led;
-        thread_sleep_for(BLINKING_RATE_MS);
-    }
-}
+//  Define the object board_LED to be a digital output connected to LED1,
+//  which is the little green LED built into the Nucleo board.
+DigitalOut board_LED(LED1);
+const int WAIT_ON = 1400; // On time in seconds.
+const int WAIT_OFF = 600; // Off time in seconds. 
+/*  
+    The "main" function defines your main program -- it executes as soon as
+    you program the board. Functions can return (compute and give back) a 
+    value.  The main function could return an integer error code, so it begins 
+    with int. Functions can also accept inputs.  The main function cannot 
+    however, so its round parentheses are empty.
+*/  
+int main() { // This curly brace marks the beginning of the main function.
+    // while() will repeat a set of actions as long as the statement inside
+    // its round parentheses is true. 1 is the definition of true, so
+    // while(1) and while(true) repeat forever. 
+    while(true) {   // This curly brace marks the start of the repeated actions.
+        board_LED = 1;  // Turn on LED by storing a 1 in board_LED.
+        ThisThread::sleep_for(WAIT_ON); // Int value in mS.
+        board_LED = 0;  // Turn off LED by storing a 0 in board_LED.
+        ThisThread::sleep_for(WAIT_OFF); // Int value in mS.
+    }  // end of repeated actions  
+}  // end of main function
\ No newline at end of file