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

Committer:
pistolero992000
Date:
2016-02-09
Revision:
0:a3cf97864ad5

File content as of revision 0:a3cf97864ad5:

/*
******************************************************************************************************
 Name        : Input Capture
 Author      : Francisco Pizarro
 Version     : 1.0
 Copyright   : Free
 Description : Input capture or External interrupt of two pins
 based on: http://anhnvnguyen.blogspot.cl/2010/04/lpc17xx-gpio-basic_05.html
******************************************************************************************************
*/

#include "mbed.h"
#include "LPC17xx.h"
#define GPIO_INT8 1 << 8// GPIO interrupt->p0.9->PIN "p6"
#define GPIO_INT9 1 << 9// GPIO interrupt->p0.9->PIN "p5"
#define LED1     1 << 18// LED1->p1.18
#define LED2     1 << 20// LED2->p1.20
#define LED3     1 << 21// LED3->p1.21
#define LED4     1 << 23// LED4->p1.23

DigitalOut Signal1(p30);
DigitalOut Signal2(p29);

extern "C" {
    void EINT3_IRQHandler(void)
    {
        if (LPC_GPIOINT->IO0IntStatR & GPIO_INT9) { //Evaluates if p5 is interrupted
            LPC_GPIOINT->IO0IntClr=GPIO_INT9;       // Clears interrupted pin p5 flag
            if (LPC_GPIO1->FIOPIN & LED1) {         // Toggles LED1 between on & off
                LPC_GPIO1->FIOCLR |= LED1;
            } else {
                LPC_GPIO1->FIOSET |= LED1;
            }
        }

        if (LPC_GPIOINT->IO0IntStatR & GPIO_INT8) {//Evaluates if p6 is interrupted
            LPC_GPIOINT->IO0IntClr=GPIO_INT8;      // Clears interrupted pin p5 flag
            if (LPC_GPIO1->FIOPIN & LED3) {        // Toggles LED3 between on & off
                LPC_GPIO1->FIOCLR |= LED3;
            } else {
                LPC_GPIO1->FIOSET |= LED3;
            }
        }
    }
}

int main(void)
{
    LPC_GPIO0->FIODIR &= ~GPIO_INT8 | ~GPIO_INT9; //set both p5 (p0.9) & p6 (p0.8) as inputs
    LPC_GPIO1->FIODIR |= LED1 | LED2 | LED3 | LED4; // set LED pins as outputs (p0.18+p0.20+p0.21+p0.23)

    LPC_GPIOINT->IO0IntEnR |=GPIO_INT8; // Enable external interrupt on p6 on rising edge trigger
    LPC_GPIOINT->IO0IntEnR |=GPIO_INT9; // Enable external interrupt on p5 on rising edge trigger
    NVIC_EnableIRQ(EINT3_IRQn); // Enable external NVIC EINT3

    while(1) { // simple square signal generation to test the interrupts on pins p5 & p6
        Signal1=1;        LPC_GPIO1->FIOSET |= LED2;
        Signal2=1;        LPC_GPIO1->FIOSET |= LED4;        wait_ms(100);
        Signal2=0;        LPC_GPIO1->FIOCLR |= LED4;        wait_ms(100);
        Signal2=1;        LPC_GPIO1->FIOSET |= LED4;        wait_ms(100);
        Signal2=0;        LPC_GPIO1->FIOCLR |= LED4;        wait_ms(100);
        
        Signal1=0;        LPC_GPIO1->FIOCLR |= LED2;
        Signal2=1;        LPC_GPIO1->FIOSET |= LED4;        wait_ms(100);
        Signal2=0;        LPC_GPIO1->FIOCLR |= LED4;        wait_ms(100);
        Signal2=1;        LPC_GPIO1->FIOSET |= LED4;        wait_ms(100);
        Signal2=0;        LPC_GPIO1->FIOCLR |= LED4;        wait_ms(100);
    }
}