Francisco Pizarro / Mbed 2 deprecated INPUT_CAPTURE

Working code for external interrupt using EINT3 and two external interrupt GPIOs. Generating two signals on pins p29 & p30, and capturing that signal on pins p5(P0.9) & p6(P0.8) each change asociated with one of the four embedded LEDs.

Dependencies:   mbed

main.cpp@0:a3cf97864ad5, 2016-02-09 (annotated)

Committer:
pistolero992000
Date:
Tue Feb 09 02:24:49 2016 +0000
Revision:
0:a3cf97864ad5
Input Capture (External Interrupt) example using two signals and two GPIO for external interrupt.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pistolero992000 0:a3cf97864ad5 1 /*
pistolero992000 0:a3cf97864ad5 2 ******************************************************************************************************
pistolero992000 0:a3cf97864ad5 3 Name : Input Capture
pistolero992000 0:a3cf97864ad5 4 Author : Francisco Pizarro
pistolero992000 0:a3cf97864ad5 5 Version : 1.0
pistolero992000 0:a3cf97864ad5 6 Copyright : Free
pistolero992000 0:a3cf97864ad5 7 Description : Input capture or External interrupt of two pins
pistolero992000 0:a3cf97864ad5 8 based on: http://anhnvnguyen.blogspot.cl/2010/04/lpc17xx-gpio-basic_05.html
pistolero992000 0:a3cf97864ad5 9 ******************************************************************************************************
pistolero992000 0:a3cf97864ad5 10 */
pistolero992000 0:a3cf97864ad5 11
pistolero992000 0:a3cf97864ad5 12 #include "mbed.h"
pistolero992000 0:a3cf97864ad5 13 #include "LPC17xx.h"
pistolero992000 0:a3cf97864ad5 14 #define GPIO_INT8 1 << 8// GPIO interrupt->p0.9->PIN "p6"
pistolero992000 0:a3cf97864ad5 15 #define GPIO_INT9 1 << 9// GPIO interrupt->p0.9->PIN "p5"
pistolero992000 0:a3cf97864ad5 16 #define LED1 1 << 18// LED1->p1.18
pistolero992000 0:a3cf97864ad5 17 #define LED2 1 << 20// LED2->p1.20
pistolero992000 0:a3cf97864ad5 18 #define LED3 1 << 21// LED3->p1.21
pistolero992000 0:a3cf97864ad5 19 #define LED4 1 << 23// LED4->p1.23
pistolero992000 0:a3cf97864ad5 20
pistolero992000 0:a3cf97864ad5 21 DigitalOut Signal1(p30);
pistolero992000 0:a3cf97864ad5 22 DigitalOut Signal2(p29);
pistolero992000 0:a3cf97864ad5 23
pistolero992000 0:a3cf97864ad5 24 extern "C" {
pistolero992000 0:a3cf97864ad5 25 void EINT3_IRQHandler(void)
pistolero992000 0:a3cf97864ad5 26 {
pistolero992000 0:a3cf97864ad5 27 if (LPC_GPIOINT->IO0IntStatR & GPIO_INT9) { //Evaluates if p5 is interrupted
pistolero992000 0:a3cf97864ad5 28 LPC_GPIOINT->IO0IntClr=GPIO_INT9; // Clears interrupted pin p5 flag
pistolero992000 0:a3cf97864ad5 29 if (LPC_GPIO1->FIOPIN & LED1) { // Toggles LED1 between on & off
pistolero992000 0:a3cf97864ad5 30 LPC_GPIO1->FIOCLR |= LED1;
pistolero992000 0:a3cf97864ad5 31 } else {
pistolero992000 0:a3cf97864ad5 32 LPC_GPIO1->FIOSET |= LED1;
pistolero992000 0:a3cf97864ad5 33 }
pistolero992000 0:a3cf97864ad5 34 }
pistolero992000 0:a3cf97864ad5 35
pistolero992000 0:a3cf97864ad5 36 if (LPC_GPIOINT->IO0IntStatR & GPIO_INT8) {//Evaluates if p6 is interrupted
pistolero992000 0:a3cf97864ad5 37 LPC_GPIOINT->IO0IntClr=GPIO_INT8; // Clears interrupted pin p5 flag
pistolero992000 0:a3cf97864ad5 38 if (LPC_GPIO1->FIOPIN & LED3) { // Toggles LED3 between on & off
pistolero992000 0:a3cf97864ad5 39 LPC_GPIO1->FIOCLR |= LED3;
pistolero992000 0:a3cf97864ad5 40 } else {
pistolero992000 0:a3cf97864ad5 41 LPC_GPIO1->FIOSET |= LED3;
pistolero992000 0:a3cf97864ad5 42 }
pistolero992000 0:a3cf97864ad5 43 }
pistolero992000 0:a3cf97864ad5 44 }
pistolero992000 0:a3cf97864ad5 45 }
pistolero992000 0:a3cf97864ad5 46
pistolero992000 0:a3cf97864ad5 47 int main(void)
pistolero992000 0:a3cf97864ad5 48 {
pistolero992000 0:a3cf97864ad5 49 LPC_GPIO0->FIODIR &= ~GPIO_INT8 | ~GPIO_INT9; //set both p5 (p0.9) & p6 (p0.8) as inputs
pistolero992000 0:a3cf97864ad5 50 LPC_GPIO1->FIODIR |= LED1 | LED2 | LED3 | LED4; // set LED pins as outputs (p0.18+p0.20+p0.21+p0.23)
pistolero992000 0:a3cf97864ad5 51
pistolero992000 0:a3cf97864ad5 52 LPC_GPIOINT->IO0IntEnR |=GPIO_INT8; // Enable external interrupt on p6 on rising edge trigger
pistolero992000 0:a3cf97864ad5 53 LPC_GPIOINT->IO0IntEnR |=GPIO_INT9; // Enable external interrupt on p5 on rising edge trigger
pistolero992000 0:a3cf97864ad5 54 NVIC_EnableIRQ(EINT3_IRQn); // Enable external NVIC EINT3
pistolero992000 0:a3cf97864ad5 55
pistolero992000 0:a3cf97864ad5 56 while(1) { // simple square signal generation to test the interrupts on pins p5 & p6
pistolero992000 0:a3cf97864ad5 57 Signal1=1; LPC_GPIO1->FIOSET |= LED2;
pistolero992000 0:a3cf97864ad5 58 Signal2=1; LPC_GPIO1->FIOSET |= LED4; wait_ms(100);
pistolero992000 0:a3cf97864ad5 59 Signal2=0; LPC_GPIO1->FIOCLR |= LED4; wait_ms(100);
pistolero992000 0:a3cf97864ad5 60 Signal2=1; LPC_GPIO1->FIOSET |= LED4; wait_ms(100);
pistolero992000 0:a3cf97864ad5 61 Signal2=0; LPC_GPIO1->FIOCLR |= LED4; wait_ms(100);
pistolero992000 0:a3cf97864ad5 62
pistolero992000 0:a3cf97864ad5 63 Signal1=0; LPC_GPIO1->FIOCLR |= LED2;
pistolero992000 0:a3cf97864ad5 64 Signal2=1; LPC_GPIO1->FIOSET |= LED4; wait_ms(100);
pistolero992000 0:a3cf97864ad5 65 Signal2=0; LPC_GPIO1->FIOCLR |= LED4; wait_ms(100);
pistolero992000 0:a3cf97864ad5 66 Signal2=1; LPC_GPIO1->FIOSET |= LED4; wait_ms(100);
pistolero992000 0:a3cf97864ad5 67 Signal2=0; LPC_GPIO1->FIOCLR |= LED4; wait_ms(100);
pistolero992000 0:a3cf97864ad5 68 }
pistolero992000 0:a3cf97864ad5 69 }