Victor Szultka / Mbed 2 deprecated 2_3_1_Interrupt_Debounce

Perform an LED toggle by interrupt over an existing sequence. PRints out to LCD upon occurence of interrupt.

Dependencies:   mbed C12832

main.cpp@0:d2238a225cb8, 2020-07-31 (annotated)

Committer:
saltire78
Date:
Fri Jul 31 12:45:22 2020 +0000
Revision:
0:d2238a225cb8
online posting

Who changed what in which revision?

UserRevisionLine numberNew contents of line
saltire78 0:d2238a225cb8 1 #include"mbed.h" // mbed header
saltire78 0:d2238a225cb8 2 #include "C12832.h" // lcd header
saltire78 0:d2238a225cb8 3
saltire78 0:d2238a225cb8 4 InterruptIn joystickcenter(p14); // initialise interrupt pin on pcb
saltire78 0:d2238a225cb8 5 InterruptIn button(p9); // initialise external interrupt pin
saltire78 0:d2238a225cb8 6 DigitalOut led(LED1); // initialise interrupt led
saltire78 0:d2238a225cb8 7 DigitalOut flash(LED4); // initialise main program led
saltire78 0:d2238a225cb8 8 C12832 lcd(p5, p7, p6, p8, p11); // initialise lcd
saltire78 0:d2238a225cb8 9 Timer debounce; // create debouce timer variable
saltire78 0:d2238a225cb8 10 int state; // create interrupt activation variable
saltire78 0:d2238a225cb8 11 int i=0; // create interrupt activation iterable variable
saltire78 0:d2238a225cb8 12
saltire78 0:d2238a225cb8 13 void flip(){
saltire78 0:d2238a225cb8 14 debounce.start(); // start the timer
saltire78 0:d2238a225cb8 15 led=!led; // toggles the led when the joystick button is pressed.
saltire78 0:d2238a225cb8 16 state= 1; // changes global variable when interrupt activated
saltire78 0:d2238a225cb8 17 if (debounce.read_ms() >= 500){ // determine the timer limits - greater than or equal incase the exact count was missed by timer
saltire78 0:d2238a225cb8 18 debounce.reset(); // reset the timer for the next use
saltire78 0:d2238a225cb8 19 }
saltire78 0:d2238a225cb8 20
saltire78 0:d2238a225cb8 21 }
saltire78 0:d2238a225cb8 22
saltire78 0:d2238a225cb8 23 int main(){
saltire78 0:d2238a225cb8 24 joystickcenter.rise(&flip); //attach the function address to the rising edge
saltire78 0:d2238a225cb8 25 button.mode(PullUp); // With this, no external pullup resistor needed
saltire78 0:d2238a225cb8 26 button.rise(&flip); // attach the function address to the rising edge
saltire78 0:d2238a225cb8 27
saltire78 0:d2238a225cb8 28 while(1){ //continuous run
saltire78 0:d2238a225cb8 29 if (state == 1){ // if interrupt activated
saltire78 0:d2238a225cb8 30 i++; // iterate the variable i
saltire78 0:d2238a225cb8 31 lcd.locate(0,0); // home the lcd
saltire78 0:d2238a225cb8 32 lcd.printf("Interrupt Activated x %d", i); // add lcd text
saltire78 0:d2238a225cb8 33 state = 0; // reset the state variable from the interrupt
saltire78 0:d2238a225cb8 34 }
saltire78 0:d2238a225cb8 35 else // normal operation
saltire78 0:d2238a225cb8 36 {
saltire78 0:d2238a225cb8 37 flash=!flash; // turns LED4 on ifoff, off if on
saltire78 0:d2238a225cb8 38 wait(0.25); // the instruction to wait for a quarter-second
saltire78 0:d2238a225cb8 39 }
saltire78 0:d2238a225cb8 40 }
saltire78 0:d2238a225cb8 41 }