Francisco Pizarro
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.
Diff: main.cpp
- Revision:
- 0:a3cf97864ad5
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Feb 09 02:24:49 2016 +0000
@@ -0,0 +1,69 @@
+/*
+******************************************************************************************************
+ 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);
+ }
+}
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