contiki/platform/cc2538dk/dev/button-sensor.c

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/*
* Copyright (c) 2012, Texas Instruments Incorporated - http://www.ti.com/
* 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.
*/
/**
* \addtogroup cc2538dk-button-sensor
* @{
*
* \file
* Driver for the SmartRF06EB buttons
*/
#include "contiki.h"
#include "dev/nvic.h"
#include "dev/ioc.h"
#include "dev/gpio.h"
#include "dev/button-sensor.h"
#include "sys/timer.h"
#include <stdint.h>
#include <string.h>
#define BUTTON_SELECT_PORT_BASE GPIO_PORT_TO_BASE(BUTTON_SELECT_PORT)
#define BUTTON_SELECT_PIN_MASK GPIO_PIN_MASK(BUTTON_SELECT_PIN)
#define BUTTON_LEFT_PORT_BASE GPIO_PORT_TO_BASE(BUTTON_LEFT_PORT)
#define BUTTON_LEFT_PIN_MASK GPIO_PIN_MASK(BUTTON_LEFT_PIN)
#define BUTTON_RIGHT_PORT_BASE GPIO_PORT_TO_BASE(BUTTON_RIGHT_PORT)
#define BUTTON_RIGHT_PIN_MASK GPIO_PIN_MASK(BUTTON_RIGHT_PIN)
#define BUTTON_UP_PORT_BASE GPIO_PORT_TO_BASE(BUTTON_UP_PORT)
#define BUTTON_UP_PIN_MASK GPIO_PIN_MASK(BUTTON_UP_PIN)
#define BUTTON_DOWN_PORT_BASE GPIO_PORT_TO_BASE(BUTTON_DOWN_PORT)
#define BUTTON_DOWN_PIN_MASK GPIO_PIN_MASK(BUTTON_DOWN_PIN)
/*---------------------------------------------------------------------------*/
static struct timer debouncetimer;
/*---------------------------------------------------------------------------*/
/**
* \brief Common initialiser for all buttons
* \param port_base GPIO port's register offset
* \param pin_mask Pin mask corresponding to the button's pin
*/
static void
config(uint32_t port_base, uint32_t pin_mask)
{
/* Software controlled */
GPIO_SOFTWARE_CONTROL(port_base, pin_mask);
/* Set pin to input */
GPIO_SET_INPUT(port_base, pin_mask);
/* Enable edge detection */
GPIO_DETECT_EDGE(port_base, pin_mask);
/* Single edge */
GPIO_TRIGGER_SINGLE_EDGE(port_base, pin_mask);
/* Trigger interrupt on Falling edge */
GPIO_DETECT_RISING(port_base, pin_mask);
GPIO_ENABLE_INTERRUPT(port_base, pin_mask);
}
/*---------------------------------------------------------------------------*/
/**
* \brief Callback registered with the GPIO module. Gets fired with a button
* port/pin generates an interrupt
* \param port The port number that generated the interrupt
* \param pin The pin number that generated the interrupt. This is the pin
* absolute number (i.e. 0, 1, ..., 7), not a mask
*/
static void
btn_callback(uint8_t port, uint8_t pin)
{
if(!timer_expired(&debouncetimer)) {
return;
}
timer_set(&debouncetimer, CLOCK_SECOND / 8);
if((port == BUTTON_SELECT_PORT) && (pin == BUTTON_SELECT_PIN)) {
sensors_changed(&button_select_sensor);
} else if((port == BUTTON_LEFT_PORT) && (pin == BUTTON_LEFT_PIN)) {
sensors_changed(&button_left_sensor);
} else if((port == BUTTON_RIGHT_PORT) && (pin == BUTTON_RIGHT_PIN)) {
sensors_changed(&button_right_sensor);
} else if((port == BUTTON_UP_PORT) && (pin == BUTTON_UP_PIN)) {
sensors_changed(&button_up_sensor);
} else if((port == BUTTON_DOWN_PORT) && (pin == BUTTON_DOWN_PIN)) {
sensors_changed(&button_down_sensor);
}
}
/*---------------------------------------------------------------------------*/
/**
* \brief Init function for the select button.
*
* Parameters are ignored. They have been included because the prototype is
* dictated by the core sensor api. The return value is also not required by
* the API but otherwise ignored.
*
* \param type ignored
* \param value ignored
* \return ignored
*/
static int
config_select(int type, int value)
{
config(BUTTON_SELECT_PORT_BASE, BUTTON_SELECT_PIN_MASK);
ioc_set_over(BUTTON_SELECT_PORT, BUTTON_SELECT_PIN, IOC_OVERRIDE_PUE);
nvic_interrupt_enable(BUTTON_SELECT_VECTOR);
gpio_register_callback(btn_callback, BUTTON_SELECT_PORT, BUTTON_SELECT_PIN);
return 1;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Init function for the left button.
*
* Parameters are ignored. They have been included because the prototype is
* dictated by the core sensor api. The return value is also not required by
* the API but otherwise ignored.
*
* \param type ignored
* \param value ignored
* \return ignored
*/
static int
config_left(int type, int value)
{
config(BUTTON_LEFT_PORT_BASE, BUTTON_LEFT_PIN_MASK);
ioc_set_over(BUTTON_LEFT_PORT, BUTTON_LEFT_PIN, IOC_OVERRIDE_PUE);
nvic_interrupt_enable(BUTTON_LEFT_VECTOR);
gpio_register_callback(btn_callback, BUTTON_LEFT_PORT, BUTTON_LEFT_PIN);
return 1;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Init function for the right button.
*
* Parameters are ignored. They have been included because the prototype is
* dictated by the core sensor api. The return value is also not required by
* the API but otherwise ignored.
*
* \param type ignored
* \param value ignored
* \return ignored
*/
static int
config_right(int type, int value)
{
config(BUTTON_RIGHT_PORT_BASE, BUTTON_RIGHT_PIN_MASK);
ioc_set_over(BUTTON_RIGHT_PORT, BUTTON_RIGHT_PIN, IOC_OVERRIDE_PUE);
nvic_interrupt_enable(BUTTON_RIGHT_VECTOR);
gpio_register_callback(btn_callback, BUTTON_RIGHT_PORT, BUTTON_RIGHT_PIN);
return 1;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Init function for the up button.
*
* Parameters are ignored. They have been included because the prototype is
* dictated by the core sensor api. The return value is also not required by
* the API but otherwise ignored.
*
* \param type ignored
* \param value ignored
* \return ignored
*/
static int
config_up(int type, int value)
{
config(BUTTON_UP_PORT_BASE, BUTTON_UP_PIN_MASK);
ioc_set_over(BUTTON_UP_PORT, BUTTON_UP_PIN, IOC_OVERRIDE_PUE);
nvic_interrupt_enable(BUTTON_UP_VECTOR);
gpio_register_callback(btn_callback, BUTTON_UP_PORT, BUTTON_UP_PIN);
return 1;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Init function for the down button.
*
* Parameters are ignored. They have been included because the prototype is
* dictated by the core sensor api. The return value is also not required by
* the API but otherwise ignored.
*
* \param type ignored
* \param value ignored
* \return ignored
*/
static int
config_down(int type, int value)
{
config(BUTTON_DOWN_PORT_BASE, BUTTON_DOWN_PIN_MASK);
ioc_set_over(BUTTON_DOWN_PORT, BUTTON_DOWN_PIN, IOC_OVERRIDE_PUE);
nvic_interrupt_enable(BUTTON_DOWN_VECTOR);
gpio_register_callback(btn_callback, BUTTON_DOWN_PORT, BUTTON_DOWN_PIN);
return 1;
}
/*---------------------------------------------------------------------------*/
void
button_sensor_init()
{
timer_set(&debouncetimer, 0);
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(button_select_sensor, BUTTON_SENSOR, NULL, config_select, NULL);
SENSORS_SENSOR(button_left_sensor, BUTTON_SENSOR, NULL, config_left, NULL);
SENSORS_SENSOR(button_right_sensor, BUTTON_SENSOR, NULL, config_right, NULL);
SENSORS_SENSOR(button_up_sensor, BUTTON_SENSOR, NULL, config_up, NULL);
SENSORS_SENSOR(button_down_sensor, BUTTON_SENSOR, NULL, config_down, NULL);
/** @} */