Diff: main.cpp

Revision:

117:e072f162cbce

Parent:

116:8990686eedf5

--- a/main.cpp	Sun Oct 17 02:15:18 2021 +0000
+++ b/main.cpp	Sun Oct 17 13:54:15 2021 +0000
@@ -2,8 +2,20 @@
 Project: 21_SerialPass_v5
 File: main.cpp
 
-Demonstrates how to pass a Serial objectto a function by reference. Also 
-introduces C strings and uses VT-100 escape sequences to prevent scrolling. 
+This project demonstrates how to pass a Serial object to functions by reference. 
+It also introduces multi-file projects and C strings. It uses VT-100 escape 
+sequences to prevent scrolling and change text color.
+
+The function approach to sending terminal control commands is awkward. It was 
+used to demonstrate the use of multiple functions each in their own file and 
+custom header files. The string constant approach used after the button is 
+better. It involves defining char array constants containing the escape codes. 
+The \x1B inserts the 1B_16 (escape) characters into the char vectors (really 
+"C strings" because they are "null terminated" (since they were created using 
+double quotes). Use the strings in printf statements to send the control text 
+to the terminal. There are probably even betters ways to do this, but this is 
+good enough for now.
+ 
 See...
 
 * C Strings: https://www.tutorialspoint.com/cprogramming/c_strings.htm.
@@ -17,47 +29,43 @@
 
 Calls
 
-clrTerm
-whiteText
-blueText
+clrTerm - Clears terminal and places cursor at home position.
+whiteText - Makes text white. Ackward to use. Done for demo.
+blueText - Makes text blue. Awkward to use. Done for demo.
 
- Written by: Dr. C. S. Tritt; Last revised 10/16/21 (v. 1.0)
+Written by: Dr. C. S. Tritt; Last revised 10/17/21 (v. 1.0)
 */
 #include "mbed.h"
 #include "myFuncs.h"
+
 // Construct a USER_BUTTON digital input.
 DigitalIn myButton(USER_BUTTON);
- // Construct a timer object. Not yet used. May use later.
-Timer myTimer;
- // Construct a transmit only serial connection over our USB.
+// Construct a Serial object for output only.
 Serial pc(USBTX, NC, 9600);
 
 int main()
 {
     clrTerm(pc); // Clear the terminal at startup.
-    whiteText(pc); // Change text to white.
+    whiteText(pc); // Change text to white (likely the default).
     pc.printf("Welcome to SerialPass.\n");
+    // This is awkward but demonstrates the use of multiple function files.
     pc.printf("Press the ");
     blueText(pc); // Change text to blue. There are better approaches to this.
     pc.printf("blue User Button");
     whiteText(pc); // Change text to white.
     pc.printf(" to clear this and continue...\n");
+    
     // Wait here for button to be pressed (making it low, false).
     while (myButton) {
-        ThisThread::sleep_for(10); // Yield time to other threads.
+        ThisThread::sleep_for(10); // Yield some time to other threads.
     }
+    // Display the most button text.
     clrTerm(pc); // Clear the terminal.
-    // This is the better approach. Define some char array constants containing
-    // the escape codes. The \x1B inserts the 1B_16 (escape) characters into the
-    // char vectors (really "C strings" because they are "null terminated"  
-    // (because they were created using the double quotes). Use the strings in
-    // printf statements to send the control text to the terminal. There are 
-    // probably even betters ways to do this, but this is good enough for now.
     const char red[] = "\x1B[31m";
     const char white[] = "\x1B[37m";
     const char blue[] = "\x1B[34m";     
     pc.printf("The screen should clear and this text appear in...\n");
-    // Note finish with white to leave terminal in a typical state.
+    // Note finish with white to leave terminal in the expected state.
     pc.printf("%sred, %swhite, and %sblue%s.\n", red, white, blue, white);
     while(true) {  // Main forever loop.
         ThisThread::sleep_for(300000); // Sleep for 5 minutes, repeatedly.