Edwin Kadavy / Mbed OS digitalInInterrupt_Edwin_Kadavy

Lab-2 Digital Interrupt by Edwin Kadavy

Fork of digitalInInterrupt_sample by William Marsh

main.cpp@4:54ff81b0e148, 2018-02-02 (annotated)

Committer:
edwinkad
Date:
Fri Feb 02 21:29:00 2018 +0000
Revision:
4:54ff81b0e148
Parent:
3:05b6a1431a6b 
Lab_2 Digital Interrupt by Edwin Kadavy

Who changed what in which revision?

UserRevisionLine numberNew contents of line
WilliamMarshQMUL 0:a66a8cb0012c 1 #include "mbed.h"
WilliamMarshQMUL 0:a66a8cb0012c 2
WilliamMarshQMUL 1:13e0c1956b54 3 // Labs 2: Example program for using an interrupt (or callback)
WilliamMarshQMUL 1:13e0c1956b54 4 // -----------------------------------------------------------
edwinkad 4:54ff81b0e148 5 // A callback function (corresponding to an ISR) is called when a button
WilliamMarshQMUL 1:13e0c1956b54 6 // is pressed
WilliamMarshQMUL 1:13e0c1956b54 7 // The callback uses a shared variable to signal another thread
WilliamMarshQMUL 0:a66a8cb0012c 8
edwinkad 4:54ff81b0e148 9 InterruptIn button1(PTD0);
edwinkad 4:54ff81b0e148 10 InterruptIn button2(PTD2);
edwinkad 4:54ff81b0e148 11 DigitalOut led1(LED_RED);
edwinkad 4:54ff81b0e148 12 DigitalOut led2(LED_BLUE);
WilliamMarshQMUL 0:a66a8cb0012c 13
edwinkad 4:54ff81b0e148 14 volatile int pressEvent1 = 0 ;
edwinkad 4:54ff81b0e148 15 volatile int pressEvent2 = 0 ;
WilliamMarshQMUL 0:a66a8cb0012c 16
WilliamMarshQMUL 3:05b6a1431a6b 17 // This function is invoked when then interrupt occurs
WilliamMarshQMUL 3:05b6a1431a6b 18 // Signal that the button has been pressed
edwinkad 4:54ff81b0e148 19 // Note: bounce may occur
edwinkad 4:54ff81b0e148 20 void buttonCallback1()
edwinkad 4:54ff81b0e148 21 {
edwinkad 4:54ff81b0e148 22 pressEvent1 = 1 ;
edwinkad 4:54ff81b0e148 23 }
edwinkad 4:54ff81b0e148 24 void buttonCallback2()
edwinkad 4:54ff81b0e148 25 {
edwinkad 4:54ff81b0e148 26 pressEvent2 = 1 ;
WilliamMarshQMUL 0:a66a8cb0012c 27 }
WilliamMarshQMUL 0:a66a8cb0012c 28
WilliamMarshQMUL 3:05b6a1431a6b 29 /* ---- Main function (default thread) ----
WilliamMarshQMUL 3:05b6a1431a6b 30 Note that if this thread completes, nothing else works
WilliamMarshQMUL 3:05b6a1431a6b 31 */
edwinkad 4:54ff81b0e148 32 int main()
edwinkad 4:54ff81b0e148 33 {
edwinkad 4:54ff81b0e148 34 button1.mode(PullUp); // Ensure button i/p has pull up
edwinkad 4:54ff81b0e148 35 button2.mode(PullUp); // Ensure button i/p has pull up
edwinkad 4:54ff81b0e148 36 button1.fall(&buttonCallback1) ; // Attach function to falling edge
edwinkad 4:54ff81b0e148 37 button2.fall(&buttonCallback2) ; // Attach function to falling edge
WilliamMarshQMUL 3:05b6a1431a6b 38
edwinkad 4:54ff81b0e148 39 bool change1=true;
edwinkad 4:54ff81b0e148 40 bool change2=true;
WilliamMarshQMUL 0:a66a8cb0012c 41 while(true) {
WilliamMarshQMUL 3:05b6a1431a6b 42 // Toggle the LED every time the button is pressed
edwinkad 4:54ff81b0e148 43 if (pressEvent1) {
edwinkad 4:54ff81b0e148 44 change1=!change1;
edwinkad 4:54ff81b0e148 45 pressEvent1 = 0 ; // Clear the event variable
edwinkad 4:54ff81b0e148 46 }
edwinkad 4:54ff81b0e148 47 if (change1==true) {
edwinkad 4:54ff81b0e148 48 led1 = !led1 ;
WilliamMarshQMUL 0:a66a8cb0012c 49 }
edwinkad 4:54ff81b0e148 50 if (pressEvent2) {
edwinkad 4:54ff81b0e148 51 change2=!change2;
edwinkad 4:54ff81b0e148 52 pressEvent2 = 0 ; // Clear the event variable
edwinkad 4:54ff81b0e148 53 }
edwinkad 4:54ff81b0e148 54 if (change2==true) {
edwinkad 4:54ff81b0e148 55 led2 = !led2 ;
edwinkad 4:54ff81b0e148 56 }
edwinkad 4:54ff81b0e148 57
edwinkad 4:54ff81b0e148 58 Thread::wait(500) ;
WilliamMarshQMUL 0:a66a8cb0012c 59 }
edwinkad 4:54ff81b0e148 60 }