main.c
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/*
* Copyright (C) 2016 Inria
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v3. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @{
*
* @file
* @brief Sample application using GPIO and UART interface
*
* @author Alexandre Abadie <alexandre.abadie@inria.fr>
*
* @}
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "board.h"
#include "msg.h"
#include "thread.h"
#include "xtimer.h"
#include "periph/gpio.h"
static uint32_t last_press;
static kernel_pid_t main_thread_pid;
static void gpio_cb(void *pin)
{
/* prevent bounce effect with on board button */
if (last_press + 100 < xtimer_now().ticks32) {
printf("GPIO Callback\n");
gpio_toggle(LED1_PIN);
msg_t msg;
msg.content.value = (uint32_t)(NULL);
msg_send(&msg, main_thread_pid);
last_press = xtimer_now().ticks32;
}
}
int main(void)
{
printf("GPIO to UART sample application\r\n");
if (gpio_init(LED1_PIN, GPIO_OUT) < 0) {
puts("Error while initializing LED GPIO as output\n");
return 1;
}
printf("LED GPIO initialized successfully as output\n");
/* Shutdown LED */
gpio_clear(LED1_PIN);
if (gpio_init_int(BTN0_PIN,GPIO_IN_PD, GPIO_RISING, gpio_cb,
(void *)BTN0_PIN) < 0) {
puts("Error while initializing BUTTON USER as external interrupt\n");
return 1;
}
printf("BUTTON GPIO initialized successfuly\n");
last_press = xtimer_now().ticks32;
/* Get main thread pid */
main_thread_pid = thread_getpid();
msg_t msg;
for (;;) {
msg_receive(&msg); /* This line blocks the loop until a message is
received. */
printf("Message received, LED is %s\n", gpio_read(LED1_PIN)? "ON" : "OFF");
}
return 0;
}