galileo: Add GPIO output example

This patch introduces an example application to demonstrate how to use
GPIO driver APIs to manipulate output pins. The application sets the
GPIO 4 pin as output pin and toggles its state at every half second.
This commit is contained in:
Ricardo de Almeida Gonzaga 2015-09-24 14:24:46 -03:00 committed by Jesus Sanchez-Palencia
parent 2d552285cd
commit cc51f89b31
3 changed files with 114 additions and 0 deletions

16
examples/galileo/Makefile Normal file
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KNOWN_EXAMPLES = gpio-output
ifneq ($(filter $(EXAMPLE),$(KNOWN_EXAMPLES)),)
CONTIKI_PROJECT = $(EXAMPLE)
else
CONTIKI_PROJECT = help
endif
all: $(CONTIKI_PROJECT)
CONTIKI = ../..
include $(CONTIKI)/Makefile.include
help:
@echo -e "\nSet the variable EXAMPLE to one of the following Galileo-specific examples:"
@for EXAMPLE in $(KNOWN_EXAMPLES); do echo $$EXAMPLE; done

25
examples/galileo/README Normal file
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Galileo Specific Examples
=======================
This directory contains galileo-specific example applications to illustrate
how to use galileo APIs.
In order to build a application, you should set the EXAMPLE environment
variable to the name of the application you want to build. For instance, if
you want to build gpio-output application, run the following command:
$ make TARGET=galileo EXAMPLE=gpio-output
============
= GPIO =
============
GPIO Output
===========
This application shows how to use the GPIO driver APIs to manipulate output
pins. This application sets the GPIO 4 pin as output pin and toggles its
state at every half second.
For a visual effect, you should wire shield pin IO1 to a led in a protoboard.
Once the application is running, you should see a blinking LED.

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/*
* Copyright (C) 2015, 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 "gpio.h"
#define PIN 4 /* IO1 */
static uint32_t value;
static struct ctimer timer;
PROCESS(gpio_output_process, "GPIO Output Process");
AUTOSTART_PROCESSES(&gpio_output_process);
/*---------------------------------------------------------------------------*/
static void
timeout(void *data)
{
/* toggle pin state */
value = !value;
quarkX1000_gpio_write(PIN, value);
ctimer_reset(&timer);
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(gpio_output_process, ev, data)
{
PROCESS_BEGIN();
quarkX1000_gpio_init();
quarkX1000_gpio_config(PIN, QUARKX1000_GPIO_OUT);
quarkX1000_gpio_clock_enable();
ctimer_set(&timer, CLOCK_SECOND / 2, timeout, NULL);
printf("GPIO output example is running\n");
PROCESS_YIELD();
quarkX1000_gpio_clock_disable();
PROCESS_END();
}