Charles Tritt / Mbed OS 21_SerialPass_v5

New example. Initial version.

main.cpp@111:956b1c606b66, 2021-10-11 (annotated)

Committer:
CSTritt
Date:
Mon Oct 11 12:15:03 2021 +0000
Revision:
111:956b1c606b66
Parent:
110:22b71c32c5e1
Child:
112:c7c727d92f2a
Older program renamed and updated to Mbed v. 5. Note: this program uses ASNSI VT-100 escape codes.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 107:61b9c99a4e27 1 /*
CSTritt 111:956b1c606b66 2 Project: 21_FuncEx_v5
CSTritt 109:b061f9830736 3 File: main.cpp
CSTritt 111:956b1c606b66 4
CSTritt 111:956b1c606b66 5 This simple program demonstrates that C passes arguments by value.
CSTritt 110:22b71c32c5e1 6
CSTritt 111:956b1c606b66 7 See http://www.csie.ntu.edu.tw/~r92094/c++/VT100.html and/or
CSTritt 111:956b1c606b66 8 https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797 for escape
CSTritt 111:956b1c606b66 9 sequences.
CSTritt 110:22b71c32c5e1 10
CSTritt 111:956b1c606b66 11 Written by: Dr. C. S. Tritt; Last revised 10/11/21 (v. 1.2)
CSTritt 107:61b9c99a4e27 12 */
Jonathan Austin 0:2757d7abb7d9 13 #include "mbed.h"
CSTritt 108:eee3167b25b4 14
CSTritt 111:956b1c606b66 15 // Function definitions are typically in .h files are more commonly that are
CSTritt 111:956b1c606b66 16 // included here.
CSTritt 111:956b1c606b66 17 int myFunc(int x, int y); // Function declaration required.
CSTritt 111:956b1c606b66 18
CSTritt 111:956b1c606b66 19 Serial pc(USBTX, USBRX, 9600); // Create Serial object.
CSTritt 111:956b1c606b66 20
CSTritt 111:956b1c606b66 21 const char ESC=27; // ESC character for ANSI escape sequences.
CSTritt 111:956b1c606b66 22 const int DELAY = 2000; // Loop delay in mS.
CSTritt 111:956b1c606b66 23
CSTritt 111:956b1c606b66 24 int main() {
CSTritt 111:956b1c606b66 25 while(true) {
CSTritt 111:956b1c606b66 26 // Clear screen & move cursor to upper left ANSI/VT100 sequence.
CSTritt 111:956b1c606b66 27 pc.printf("%c[2J", ESC); pc.printf("%c[H", ESC);
CSTritt 111:956b1c606b66 28 // Start of display code.
CSTritt 111:956b1c606b66 29 pc.printf("In function demo main...\n");
CSTritt 111:956b1c606b66 30 int a = 5; // Create and initialize a.
CSTritt 111:956b1c606b66 31 pc.printf("a = %d\n", a); // Display a.
CSTritt 111:956b1c606b66 32 int b = 6; // Create and initialize b.
CSTritt 111:956b1c606b66 33 pc.printf("b = %d\n", b); // Display b.
CSTritt 111:956b1c606b66 34 pc.printf("About to call my function.\n");
CSTritt 111:956b1c606b66 35 int c = myFunc(a, b); // Call my function.
CSTritt 111:956b1c606b66 36 pc.printf("Function has returned.\n");
CSTritt 111:956b1c606b66 37 pc.printf("a = %d\n", a); // Redisplay a.
CSTritt 111:956b1c606b66 38 pc.printf("b = %d\n", b); // Redisplay b.
CSTritt 111:956b1c606b66 39 pc.printf("c = %d\n", c); // Display b.
CSTritt 111:956b1c606b66 40 ThisThread::sleep_for(DELAY); // Pause for DELAY mS.
CSTritt 108:eee3167b25b4 41 }
CSTritt 111:956b1c606b66 42 }
CSTritt 111:956b1c606b66 43
CSTritt 111:956b1c606b66 44 int myFunc(int x, int y) { // Function definition. Often in separate files!
CSTritt 111:956b1c606b66 45 int z = x + y;
CSTritt 111:956b1c606b66 46 // Changing parameter values here won't change argument values in main!
CSTritt 111:956b1c606b66 47 x = 50;
CSTritt 111:956b1c606b66 48 pc.printf("x = %d\n", x); // Generally don't put I/O in regular functions.
CSTritt 111:956b1c606b66 49 y = 100;
CSTritt 111:956b1c606b66 50 pc.printf("y = %d\n", y); // Generally don't put I/O in regular functions.
CSTritt 111:956b1c606b66 51 return z; // Explicit return is required in C/C++.
CSTritt 111:956b1c606b66 52 }