William Marsh / Mbed OS serial-demo

Test program for serial interface

This program turns the red LED on and then waits for a character to be entered at the terminal. The LED then goes off for 500ms before the cycle repeats.

The purpose of the program is to demonstrate the use of the serial link

main.cpp@4:a2d1329d042c, 2020-01-22 (annotated)

Committer:
WilliamMarshQMUL
Date:
Wed Jan 22 12:34:48 2020 +0000
Revision:
4:a2d1329d042c
Parent:
3:5b27b27e68ab 
Echo twice to show clearly what's happening

Who changed what in which revision?

UserRevisionLine numberNew contents of line
WilliamMarshQMUL 2:e92d97ac59e4 1 // Serial demo using mbed 5
WilliamMarshQMUL 2:e92d97ac59e4 2
WilliamMarshQMUL 0:75835b5692b9 3 #include "mbed.h"
WilliamMarshQMUL 0:75835b5692b9 4
WilliamMarshQMUL 0:75835b5692b9 5 DigitalOut myled(LED1);
WilliamMarshQMUL 0:75835b5692b9 6 Serial pc(USBTX, USBRX); // tx, rx
WilliamMarshQMUL 0:75835b5692b9 7
WilliamMarshQMUL 0:75835b5692b9 8 int main() {
WilliamMarshQMUL 0:75835b5692b9 9 char c ;
WilliamMarshQMUL 0:75835b5692b9 10 pc.printf("Enter a character>");
WilliamMarshQMUL 0:75835b5692b9 11 while(1) {
WilliamMarshQMUL 0:75835b5692b9 12 myled = 0; // turn on
WilliamMarshQMUL 0:75835b5692b9 13 c = pc.getc();
WilliamMarshQMUL 0:75835b5692b9 14 myled = 1; // turn off
WilliamMarshQMUL 0:75835b5692b9 15 pc.putc(c);
WilliamMarshQMUL 4:a2d1329d042c 16 pc.putc(c); // echo twice
WilliamMarshQMUL 1:961580c296da 17 pc.putc('\r');
WilliamMarshQMUL 0:75835b5692b9 18 pc.putc('\n');
WilliamMarshQMUL 3:5b27b27e68ab 19 wait(0.5);
WilliamMarshQMUL 0:75835b5692b9 20 pc.printf("Enter a character>");
WilliamMarshQMUL 0:75835b5692b9 21 }
WilliamMarshQMUL 0:75835b5692b9 22 }