contiki/platform/openmote-cc2538/dev/button-sensor.c

180 lines
6.3 KiB
C

/*
* 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.
*
* This file is part of the Contiki operating system.
*
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup openmote-button-sensor
* @{
*
* \file
* Driver for for the OpenMote-CC2538 user button
*/
/*---------------------------------------------------------------------------*/
#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 "sys/ctimer.h"
#include "sys/process.h"
#include <stdint.h>
#include <string.h>
/*---------------------------------------------------------------------------*/
#define BUTTON_USER_PORT_BASE GPIO_PORT_TO_BASE(BUTTON_USER_PORT)
#define BUTTON_USER_PIN_MASK GPIO_PIN_MASK(BUTTON_USER_PIN)
/*---------------------------------------------------------------------------*/
#define DEBOUNCE_DURATION (CLOCK_SECOND >> 4)
static struct timer debouncetimer;
/*---------------------------------------------------------------------------*/
static clock_time_t press_duration = 0;
static struct ctimer press_counter;
static uint8_t press_event_counter;
process_event_t button_press_duration_exceeded;
/*---------------------------------------------------------------------------*/
static void
duration_exceeded_callback(void *data)
{
press_event_counter++;
process_post(PROCESS_BROADCAST, button_press_duration_exceeded,
&press_event_counter);
ctimer_set(&press_counter, press_duration, duration_exceeded_callback,
NULL);
}
/*---------------------------------------------------------------------------*/
/**
* \brief Retrieves the value of the button pin
* \param type Returns the pin level or the counter of press duration events.
* type == BUTTON_SENSOR_VALUE_TYPE_LEVEL or
* type == BUTTON_SENSOR_VALUE_TYPE_PRESS_DURATION
* respectively
*/
static int
value(int type)
{
switch(type) {
case BUTTON_SENSOR_VALUE_TYPE_LEVEL:
return GPIO_READ_PIN(BUTTON_USER_PORT_BASE, BUTTON_USER_PIN_MASK);
case BUTTON_SENSOR_VALUE_TYPE_PRESS_DURATION:
return press_event_counter;
}
return 0;
}
/*---------------------------------------------------------------------------*/
/**
* \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, DEBOUNCE_DURATION);
if(press_duration) {
press_event_counter = 0;
if(value(BUTTON_SENSOR_VALUE_TYPE_LEVEL) == BUTTON_SENSOR_PRESSED_LEVEL) {
ctimer_set(&press_counter, press_duration, duration_exceeded_callback,
NULL);
} else {
ctimer_stop(&press_counter);
}
}
sensors_changed(&button_sensor);
}
/*---------------------------------------------------------------------------*/
/**
* \brief Init function for the User button.
* \param type SENSORS_ACTIVE: Activate / Deactivate the sensor (value == 1
* or 0 respectively)
*
* \param value Depends on the value of the type argument
* \return Depends on the value of the type argument
*/
static int
config_user(int type, int value)
{
switch(type) {
case SENSORS_HW_INIT:
button_press_duration_exceeded = process_alloc_event();
/* Software controlled */
GPIO_SOFTWARE_CONTROL(BUTTON_USER_PORT_BASE, BUTTON_USER_PIN_MASK);
/* Set pin to input */
GPIO_SET_INPUT(BUTTON_USER_PORT_BASE, BUTTON_USER_PIN_MASK);
/* Enable edge detection */
GPIO_DETECT_EDGE(BUTTON_USER_PORT_BASE, BUTTON_USER_PIN_MASK);
/* Both Edges */
GPIO_TRIGGER_BOTH_EDGES(BUTTON_USER_PORT_BASE, BUTTON_USER_PIN_MASK);
ioc_set_over(BUTTON_USER_PORT, BUTTON_USER_PIN, IOC_OVERRIDE_PUE);
gpio_register_callback(btn_callback, BUTTON_USER_PORT, BUTTON_USER_PIN);
break;
case SENSORS_ACTIVE:
if(value) {
GPIO_ENABLE_INTERRUPT(BUTTON_USER_PORT_BASE, BUTTON_USER_PIN_MASK);
nvic_interrupt_enable(BUTTON_USER_VECTOR);
} else {
GPIO_DISABLE_INTERRUPT(BUTTON_USER_PORT_BASE, BUTTON_USER_PIN_MASK);
nvic_interrupt_disable(BUTTON_USER_VECTOR);
}
return value;
case BUTTON_SENSOR_CONFIG_TYPE_INTERVAL:
press_duration = (clock_time_t)value;
break;
default:
break;
}
return 1;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(button_sensor, BUTTON_SENSOR, value, config_user, NULL);
/*---------------------------------------------------------------------------*/
/** @} */