contiki/examples/galileo/gpio-input.c

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/*
* Copyright (C) 2015-2016, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include "contiki.h"
#include "sys/ctimer.h"
#include "galileo-gpio.h"
#include "gpio.h"
#define PIN_OUTPUT 2
#define PIN_INPUT 3
static uint32_t value;
static struct ctimer timer;
PROCESS(gpio_input_process, "GPIO Input Process");
AUTOSTART_PROCESSES(&gpio_input_process);
/*---------------------------------------------------------------------------*/
static void
timeout(void *data)
{
uint8_t value_in;
/* toggle pin state */
value = !value;
galileo_gpio_write(PIN_OUTPUT, value);
galileo_gpio_read(PIN_INPUT, &value_in);
if (value == value_in)
printf("GPIO pin value match!\n");
else
printf("GPIO pin value DOESN'T match!\n");
ctimer_reset(&timer);
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(gpio_input_process, ev, data)
{
PROCESS_BEGIN();
quarkX1000_gpio_clock_enable();
ctimer_set(&timer, CLOCK_SECOND / 2, timeout, NULL);
printf("GPIO input example is running\n");
PROCESS_YIELD();
quarkX1000_gpio_clock_disable();
PROCESS_END();
}