Charles Tritt / Mbed OS 21_TW_Ex_9_1_v5

Initial Mbed v. 5 version. Demonstrates ISR using two LED junctions, one blinking and one toggling.

main.cpp@108:5621bbcc10f5, 2021-10-17 (annotated)

Committer:
CSTritt
Date:
Sun Oct 17 15:29:28 2021 +0000
Revision:
108:5621bbcc10f5
Parent:
107:61b9c99a4e27
Child:
109:e9badabfd93d
Initial v5 version.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 107:61b9c99a4e27 1 /*
CSTritt 108:5621bbcc10f5 2 Project: 21_TW_Ex_9_1_v5
CSTritt 108:5621bbcc10f5 3 File: main.cpp
CSTritt 108:5621bbcc10f5 4
CSTritt 108:5621bbcc10f5 5 An example similar to T&W example 9.1. Green junction will flash
CSTritt 108:5621bbcc10f5 6 continuously. Blue junction will toggle in response to depressing the user
CSTritt 108:5621bbcc10f5 7 button.
CSTritt 108:5621bbcc10f5 8
CSTritt 108:5621bbcc10f5 9 Created by Dr. C. S. Tritt
CSTritt 108:5621bbcc10f5 10 Last revised: 10/17/21 (v. 1.0)
CSTritt 107:61b9c99a4e27 11 */
Jonathan Austin 0:2757d7abb7d9 12 #include "mbed.h"
CSTritt 108:5621bbcc10f5 13
CSTritt 108:5621bbcc10f5 14 InterruptIn myButton(USER_BUTTON); // Button is normally high. Goes low w/press.
CSTritt 108:5621bbcc10f5 15
CSTritt 108:5621bbcc10f5 16 DigitalOut bluLED(D4); // Blue and green LED junctions.
CSTritt 108:5621bbcc10f5 17 DigitalOut grnLED(D3);
CSTritt 108:5621bbcc10f5 18
CSTritt 108:5621bbcc10f5 19 void myISR() { // Simple ISR toggles the blue LED junction when called.
CSTritt 108:5621bbcc10f5 20 bluLED = !bluLED; // Toggle blue junction.
CSTritt 108:5621bbcc10f5 21 }
CSTritt 108:5621bbcc10f5 22
CSTritt 108:5621bbcc10f5 23 int main() {
CSTritt 108:5621bbcc10f5 24 const int GRN_PERIOD = 500;
CSTritt 108:5621bbcc10f5 25 bluLED = 0; // Turn blue & green off at start.
CSTritt 108:5621bbcc10f5 26 grnLED = 0;
CSTritt 108:5621bbcc10f5 27
CSTritt 108:5621bbcc10f5 28 myButton.fall(&myISR); // "Register" the ISR routine. Sets vector.
CSTritt 108:5621bbcc10f5 29
CSTritt 108:5621bbcc10f5 30 while(true) {
CSTritt 108:5621bbcc10f5 31 grnLED = !grnLED; // Toggle green junction.
CSTritt 108:5621bbcc10f5 32 ThisThread::sleep_for(GRN_PERIOD); // Sleep for GRN_PERIOD mS.
CSTritt 108:5621bbcc10f5 33 }
CSTritt 108:5621bbcc10f5 34 }