Charles Tritt / Mbed OS 21_BitTests_v5

This program is intended for use exploring bitwise operator. It also demonstrates the use of the 8-bit unsigned char type and using printf to display integer values in various number bases.

main.cpp@107:e7084caca83a, 2021-10-01 (annotated)

Committer:
CSTritt
Date:
Fri Oct 01 18:16:36 2021 +0000
Revision:
107:e7084caca83a
Parent:
105:ed03c03b353e
Child:
108:61d009929518
Initial version.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 107:e7084caca83a 1 /*
CSTritt 107:e7084caca83a 2 Project: 21_BitTests_v5
CSTritt 107:e7084caca83a 3 File: main.cpp
CSTritt 107:e7084caca83a 4
CSTritt 107:e7084caca83a 5 Explores literal integers and bitwise operations.
CSTritt 107:e7084caca83a 6
CSTritt 107:e7084caca83a 7 Last modified 9/30/21 by C. S. Tritt (v. 1.0)
CSTritt 107:e7084caca83a 8 */
Jonathan Austin 0:2757d7abb7d9 9 #include "mbed.h"
Jonathan Austin 0:2757d7abb7d9 10
CSTritt 107:e7084caca83a 11 // Pulse durations.
CSTritt 107:e7084caca83a 12 const int SPULSE = 500;
CSTritt 107:e7084caca83a 13 const int LPULSE = 1000;
Jonathan Austin 0:2757d7abb7d9 14
CSTritt 107:e7084caca83a 15 // Construct a transmit only serial connection over our USB.
CSTritt 107:e7084caca83a 16 Serial pc(USBTX, NC, 9600); // Serial channel to PC.
CSTritt 107:e7084caca83a 17 // Construct a 8-bit BusOut bargraph display.
CSTritt 107:e7084caca83a 18 BusOut barGraph(D2, D3, D4, D5, D6, D7, D8, D9); // The display.
CSTritt 107:e7084caca83a 19
mbed_official 82:abf1b1785bd7 20 int main()
mbed_official 82:abf1b1785bd7 21 {
CSTritt 107:e7084caca83a 22 while (true) { // Main loop.
CSTritt 107:e7084caca83a 23 // Set some values.
CSTritt 107:e7084caca83a 24 unsigned char myIntA = 0b10101010; // Binary. 170_10.
CSTritt 107:e7084caca83a 25 unsigned char myIntB = 0x3E; // Hex. 62_10.
CSTritt 107:e7084caca83a 26 unsigned char myIntC = 077; // Octal, 63_10.
CSTritt 107:e7084caca83a 27
CSTritt 107:e7084caca83a 28 // Do a bitwise operation.
CSTritt 107:e7084caca83a 29 unsigned char myIntD = myIntA | myIntB;
CSTritt 107:e7084caca83a 30
CSTritt 107:e7084caca83a 31 // Send output to PC and bargraph.
CSTritt 107:e7084caca83a 32 pc.printf("myIntA = %d (base 10).\n", myIntA);
CSTritt 107:e7084caca83a 33 barGraph = myIntA;
CSTritt 107:e7084caca83a 34 ThisThread::sleep_for(SPULSE);
CSTritt 107:e7084caca83a 35
CSTritt 107:e7084caca83a 36 pc.printf("myIntB = %X (Hexadecimal).\n", myIntB);
CSTritt 107:e7084caca83a 37 barGraph = myIntB;
CSTritt 107:e7084caca83a 38 ThisThread::sleep_for(SPULSE);
CSTritt 107:e7084caca83a 39
CSTritt 107:e7084caca83a 40 pc.printf("myIntC = %o (Octal).\n", myIntC);
CSTritt 107:e7084caca83a 41 barGraph = myIntC;
CSTritt 107:e7084caca83a 42 ThisThread::sleep_for(SPULSE);
CSTritt 107:e7084caca83a 43
CSTritt 107:e7084caca83a 44 pc.printf("myIntD = %X (Hexadecimal).\n", myIntD);
CSTritt 107:e7084caca83a 45 barGraph = myIntD;
CSTritt 107:e7084caca83a 46 ThisThread::sleep_for(LPULSE);
CSTritt 107:e7084caca83a 47 pc.printf("Repeating...\n\n");
Jonathan Austin 0:2757d7abb7d9 48 }
CSTritt 107:e7084caca83a 49 }