Manuel Campos / Mbed OS digitalInInterrupt_solution

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Fork of digitalInInterrupt_sample by William Marsh

main.cpp@4:5af35f086ddd, 2018-02-01 (annotated)

Committer:
cvmanuel
Date:
Thu Feb 01 17:13:53 2018 +0000
Revision:
4:5af35f086ddd
Parent:
3:05b6a1431a6b
Child:
5:dd7d8fb1ad75
manuel solution

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 // -----------------------------------------------------------
WilliamMarshQMUL 1:13e0c1956b54 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
cvmanuel 4:5af35f086ddd 9
WilliamMarshQMUL 1:13e0c1956b54 10 InterruptIn button(PTD0);
cvmanuel 4:5af35f086ddd 11 DigitalOut led(LED_BLUE);
cvmanuel 4:5af35f086ddd 12 DigitalOut led2(LED_RED);
cvmanuel 4:5af35f086ddd 13 InterruptIn button2(PTD5);
cvmanuel 4:5af35f086ddd 14
cvmanuel 4:5af35f086ddd 15
WilliamMarshQMUL 0:a66a8cb0012c 16
WilliamMarshQMUL 1:13e0c1956b54 17 volatile int pressEvent = 0 ;
cvmanuel 4:5af35f086ddd 18 volatile int pressEvent2 = 0 ;
cvmanuel 4:5af35f086ddd 19
cvmanuel 4:5af35f086ddd 20 bool pressed1 = false;
cvmanuel 4:5af35f086ddd 21 bool pressed2 = false;
WilliamMarshQMUL 0:a66a8cb0012c 22
WilliamMarshQMUL 3:05b6a1431a6b 23 // This function is invoked when then interrupt occurs
WilliamMarshQMUL 3:05b6a1431a6b 24 // Signal that the button has been pressed
WilliamMarshQMUL 1:13e0c1956b54 25 // Note: bounce may occur
WilliamMarshQMUL 1:13e0c1956b54 26 void buttonCallback(){
WilliamMarshQMUL 1:13e0c1956b54 27 pressEvent = 1 ;
WilliamMarshQMUL 0:a66a8cb0012c 28 }
WilliamMarshQMUL 0:a66a8cb0012c 29
cvmanuel 4:5af35f086ddd 30 void buttonCallback2(){
cvmanuel 4:5af35f086ddd 31 pressEvent2 = 1 ;
cvmanuel 4:5af35f086ddd 32 }
cvmanuel 4:5af35f086ddd 33
WilliamMarshQMUL 3:05b6a1431a6b 34 /* ---- Main function (default thread) ----
WilliamMarshQMUL 3:05b6a1431a6b 35 Note that if this thread completes, nothing else works
WilliamMarshQMUL 3:05b6a1431a6b 36 */
WilliamMarshQMUL 3:05b6a1431a6b 37 int main() {
WilliamMarshQMUL 3:05b6a1431a6b 38 button.mode(PullUp); // Ensure button i/p has pull up
WilliamMarshQMUL 3:05b6a1431a6b 39 button.fall(&buttonCallback) ; // Attach function to falling edge
cvmanuel 4:5af35f086ddd 40
cvmanuel 4:5af35f086ddd 41 button2.mode(PullUp); // Ensure button i/p has pull up
cvmanuel 4:5af35f086ddd 42 button2.fall(&buttonCallback2) ; // Attach function to falling edge
WilliamMarshQMUL 3:05b6a1431a6b 43
WilliamMarshQMUL 0:a66a8cb0012c 44 while(true) {
WilliamMarshQMUL 3:05b6a1431a6b 45 // Toggle the LED every time the button is pressed
WilliamMarshQMUL 0:a66a8cb0012c 46 if (pressEvent) {
cvmanuel 4:5af35f086ddd 47 pressEvent = 0; // Clear the event variable
cvmanuel 4:5af35f086ddd 48 pressed1 = !pressed1;
cvmanuel 4:5af35f086ddd 49 }
cvmanuel 4:5af35f086ddd 50 if (pressEvent2) {
cvmanuel 4:5af35f086ddd 51 pressEvent2= 0 ; // Clear the event variable
cvmanuel 4:5af35f086ddd 52 pressed2= !pressed2;
cvmanuel 4:5af35f086ddd 53 }
cvmanuel 4:5af35f086ddd 54 if(!pressed1)
cvmanuel 4:5af35f086ddd 55 {
WilliamMarshQMUL 0:a66a8cb0012c 56 led = !led ;
WilliamMarshQMUL 0:a66a8cb0012c 57 }
cvmanuel 4:5af35f086ddd 58 if(!pressed2) {
cvmanuel 4:5af35f086ddd 59 led2= !led2;
cvmanuel 4:5af35f086ddd 60 }
cvmanuel 4:5af35f086ddd 61 Thread::wait(2000) ;
WilliamMarshQMUL 0:a66a8cb0012c 62 }
WilliamMarshQMUL 0:a66a8cb0012c 63 }