Diff: main.cpp

Revision:

109:b061f9830736

Parent:

108:eee3167b25b4

Child:

110:22b71c32c5e1

--- a/main.cpp	Tue Sep 21 02:00:55 2021 +0000
+++ b/main.cpp	Fri Oct 01 02:45:38 2021 +0000
@@ -1,31 +1,29 @@
 /*
-    Project: BinaryCount
-    File: main.cpp
-    
-    Displays 8 bit binary count on bar graph display.
-    
-    Written by: Dr. C. S. Tritt
-    Created: 9/20/21 (v. 1.2)
+Project: 21_Button-v5
+File: main.cpp
+
+Toogles LED1 when USER_BUTTON is tapped. Note LED1 is also PA_5 which is
+also D13. Based on built-in mbed example Nucleo_read_button. Holding the button 
+down will result in LED flashing.
+
+Modified 12 Aug 2017 by Dr. Sheila Ross
+Last revised 9/30/21 by Dr. C. S. Tritt
 */
+
 #include "mbed.h"
 
-BusOut barGraph(D2, D3, D4, D5, D6, D7, D8, D9);  // Create BusOut object.
+// Construct a digital input linked to the USER_BUTTON.
+DigitalIn myButton(USER_BUTTON); // Built in blue button.
+
+// Construct a digital output linked to LED1.
+DigitalOut myLed(LED1); // Built-in green LED.
 
-int main() {
-    // Test the wiring.
-    barGraph = 0;  // All bars off (base 10).
-    ThisThread::sleep_for(400); // For 0.4 seconds.
-    barGraph = 0b01010101;  // Odd bars on (binary).
-    ThisThread::sleep_for(400); // Test even bars for 0.4 seconds. 
-    barGraph = 0b10101010;  // Even bars on (binary).   
-    ThisThread::sleep_for(400); // Test even bars for 0.4 seconds.
-    barGraph = 0xFF;  // All bars on. Hex.
-    ThisThread::sleep_for(400); // For 0.4 seconds.
-    // Enter main loop.   
-    while(true) {
-        for (int i = 0; i < 256; i++) { // Add one to count.
-            barGraph = i;  // Copy the count to the bargraph.
-            ThisThread::sleep_for(100);  // Display the value for 0.1 seconds.
+int main()
+{
+    while(true) { // Main loop.
+        if (myButton == 0) { // Button is active low.
+            myLed = !myLed; // Toggle LED on/off.
+            ThisThread::sleep_for(100);  // Avoid double-tap, 0.1 seconds.
         }
     }
 }
\ No newline at end of file