Add gpio interrupt sample code

This commit is contained in:
Sanchayan Maity 2017-04-25 12:38:43 +05:30
parent 82cc507e07
commit 7b815d3369
5 changed files with 227 additions and 0 deletions

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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdint.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include "libsoc_gpio.h"
/*
* libsoc GPIO documentation: http://jackmitch.github.io/libsoc/c/gpio/#gpio
*/
volatile bool interrupt_occurred = false;
volatile bool led_status = false;
int gpio_interrupt_callback(void* arg)
{
interrupt_occurred = true;
return 0;
}
int main(void)
{
uint32_t gpio_input;
uint32_t led_output;
uint32_t ret = 0;
gpio *gpio_interrupt = NULL;
gpio *gpio_led = NULL;
printf("Enter the GPIO number to use as interrupt:\t");
scanf("%d", &gpio_input);
printf("Enter the GPIO number used for LED output:\t");
scanf("%d", &led_output);
/*
* It is expected that the gpio being requested is pin multiplexed correctly
* in the kernel device tree or board file as applicable else gpio request
* is bound to fail.
*/
gpio_interrupt = libsoc_gpio_request(gpio_input, LS_SHARED);
if (gpio_interrupt == NULL) {
perror("gpio request failed");
goto exit;
}
gpio_led = libsoc_gpio_request(led_output, LS_SHARED);
if (gpio_led == NULL) {
perror("led gpio request failed");
goto exit;
}
ret = libsoc_gpio_set_direction(gpio_led, OUTPUT);
if (ret == EXIT_FAILURE) {
perror("Failed to set gpio led direction");
goto exit;
}
ret = libsoc_gpio_set_direction(gpio_interrupt, INPUT);
if (ret == EXIT_FAILURE) {
perror("Failed to set gpio direction");
goto exit;
}
ret = libsoc_gpio_set_edge(gpio_interrupt, RISING);
if (ret == EXIT_FAILURE) {
perror("Failed to set gpio edge");
goto exit;
}
ret = libsoc_gpio_callback_interrupt(gpio_interrupt, &gpio_interrupt_callback, NULL);
if (ret == EXIT_FAILURE) {
perror("Failed to set gpio callback");
goto exit;
}
printf("Waiting for interrupt\n");
while (true) {
if (interrupt_occurred) {
interrupt_occurred = false;
if (!led_status) {
led_status = true;
libsoc_gpio_set_level(gpio_led, HIGH);
} else {
led_status = false;
libsoc_gpio_set_level(gpio_led, LOW);
}
printf("Interrupt occurred\n");
/* Uncomment this to exit on first interrupt */
//goto exit;
}
usleep(200);
}
exit:
if (gpio_interrupt) {
ret = libsoc_gpio_free(gpio_interrupt);
if (ret == EXIT_FAILURE)
perror("Could not free gpio");
}
if (gpio_led) {
ret = libsoc_gpio_free(gpio_led);
if (ret == EXIT_FAILURE)
perror("Could not free led gpio");
}
return ret;
}