Diff: main.cpp

Revision:

109:86a37f0a397f

Parent:

108:eee3167b25b4

Child:

110:e80444a6fe3a

--- a/main.cpp	Tue Sep 21 02:00:55 2021 +0000
+++ b/main.cpp	Tue Oct 05 05:00:06 2021 +0000
@@ -1,31 +1,45 @@
 /*
-    Project: BinaryCount
+    Project: Binary Counter Improved (while loop) Version
     File: main.cpp
     
-    Displays 8 bit binary count on bar graph display.
+    Displays 8-bit binary count on bar graph display. This version uses a while 
+    loop which provides a much better starting point for an Up/Down counter.
+    
+    Error in pow function use corrected in v. 1.0.
     
+    Note: I tried to use count for the loop counter but this resulted in an 
+    ambiguous name error.
+        
     Written by: Dr. C. S. Tritt
-    Created: 9/20/21 (v. 1.2)
+    Created: 9/27/21 (v. 1.0)
 */
 #include "mbed.h"
 
-BusOut barGraph(D2, D3, D4, D5, D6, D7, D8, D9);  // Create BusOut object.
+DigitalIn uB(USER_BUTTON); // Button is active low (up = 1, down = 0).
+const int bits = 4; // Number of bits to use.
+const int c_max = pow(2, bits) - 1; // Maximum count. pow is type double.
+const int sleepTime = 100; // Sleep time in milliseconds.
+int myCount = 0; // Count to be displayed. Loop counter.
+BusOut barGraph(D2, D3, D4, D5, D6, D7, D8, D9);  // The display.
 
 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.   
+    ThisThread::sleep_for(400); // For 0.4 seconds.  
+
+    barGraph = myCount; // Initialize the display to myCount.
+    // 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.
+        while (myCount >= 0 && myCount <= c_max) {
+            barGraph = myCount; // Set display to myCount.
+            ThisThread::sleep_for(sleepTime);  // Display value for 0.1 seconds.
+            myCount++;
         }
+        myCount = 0;
     }
 }
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