222 lines
7.4 KiB
C
222 lines
7.4 KiB
C
/*
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* Copyright (c) 2018, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup launchpad-button-sensor
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* @{
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*
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* \file
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* Driver for LaunchPad buttons
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*/
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/*---------------------------------------------------------------------------*/
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#include <contiki.h>
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#include <sys/timer.h>
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#include <lib/sensors.h>
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/*---------------------------------------------------------------------------*/
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#include <Board.h>
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#include <ti/drivers/PIN.h>
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#include <ti/drivers/Power.h>
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/*---------------------------------------------------------------------------*/
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#include <stdint.h>
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#include <stdbool.h>
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/*---------------------------------------------------------------------------*/
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#include "button-sensor.h"
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/*---------------------------------------------------------------------------*/
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/* LaunchPad has 2 buttons: BTN1 and BTN2 */
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/* Map the GPIO defines from the Board file */
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#define BTN1_PIN Board_PIN_BTN1
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#define BTN2_PIN Board_PIN_BTN2
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/*---------------------------------------------------------------------------*/
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#ifdef BUTTON_SENSOR_CONF_ENABLE_SHUTDOWN
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# define BUTTON_SENSOR_ENABLE_SHUTDOWN BUTTON_SENSOR_CONF_ENABLE_SHUTDOWN
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#else
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# define BUTTON_SENSOR_ENABLE_SHUTDOWN 0
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#endif
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/*---------------------------------------------------------------------------*/
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#define DEBOUNCE_DURATION (CLOCK_SECOND >> 5)
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/*---------------------------------------------------------------------------*/
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typedef struct {
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struct timer debounce;
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clock_time_t start;
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clock_time_t duration;
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} BtnTimer;
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/*---------------------------------------------------------------------------*/
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static BtnTimer btn1_timer;
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static BtnTimer btn2_timer;
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/*---------------------------------------------------------------------------*/
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static const PIN_Config btn_pin_table[] = {
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BTN1_PIN | PIN_INPUT_EN | PIN_PULLUP | PIN_IRQ_BOTHEDGES | PIN_HYSTERESIS, /* Button is active low */
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BTN2_PIN | PIN_INPUT_EN | PIN_PULLUP | PIN_IRQ_BOTHEDGES | PIN_HYSTERESIS, /* Button is active low */
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PIN_TERMINATE
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};
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static PIN_State pin_state;
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static PIN_Handle pin_handle;
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/*---------------------------------------------------------------------------*/
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static void
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button_press_cb(PIN_Handle handle, PIN_Id pin_id)
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{
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#if BUTTON_SENSOR_ENABLE_SHUTDOWN
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if (pin_id == BTN2_PIN) {
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Power_shutdown(Power_ENTERING_SHUTDOWN, 0);
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return;
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}
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#endif
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BtnTimer *btn_timer = NULL;
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const struct sensors_sensor *btn_sensor = NULL;
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switch (pin_id) {
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case BTN1_PIN: btn_timer = &btn1_timer;
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btn_sensor = &button_left_sensor; break;
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case BTN2_PIN: btn_timer = &btn2_timer;
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btn_sensor = &button_right_sensor; break;
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default: return; /* No matching PIN */
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}
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if (!timer_expired(&btn_timer->debounce)) {
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return;
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}
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timer_set(&btn_timer->debounce, DEBOUNCE_DURATION);
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// Start press duration counter on press (falling), notify on release (rising)
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if (PIN_getInputValue(pin_id) == 0) {
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btn_timer->start = clock_time();
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btn_timer->duration = 0;
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} else {
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btn_timer->duration = clock_time() - btn_timer->start;
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sensors_changed(btn_sensor);
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}
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}
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/*---------------------------------------------------------------------------*/
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static int
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button_value(int type, uint8_t pin, BtnTimer *btn_timer)
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{
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switch (type) {
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case BUTTON_SENSOR_TYPE_STATE:
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return (PIN_getInputValue(pin) == 0)
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? BUTTON_SENSOR_VALUE_PRESSED
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: BUTTON_SENSOR_VALUE_RELEASED;
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case BUTTON_SENSOR_TYPE_DURATION:
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return (int)btn_timer->duration;
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default:
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return 0;
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}
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}
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/*---------------------------------------------------------------------------*/
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static int
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button_config(int type, int value, uint8_t pin)
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{
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switch (type) {
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case SENSORS_HW_INIT:
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// Open PIN handle
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if (pin_handle) {
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return 1;
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}
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pin_handle = PIN_open(&pin_state, btn_pin_table);
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if (!pin_handle) {
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return 0;
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}
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// Register button callback function
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PIN_registerIntCb(pin_handle, button_press_cb);
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break;
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case SENSORS_ACTIVE:
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if (value) {
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// Enable interrupts on both edges
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PIN_setInterrupt(pin_handle, pin | PIN_IRQ_BOTHEDGES);
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} else {
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// Disable pin interrupts
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PIN_setInterrupt(pin_handle, pin | PIN_IRQ_DIS);
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}
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break;
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}
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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button_status(int type, uint8_t pin)
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{
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switch(type) {
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case SENSORS_ACTIVE: /* fallthrough */
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case SENSORS_READY: {
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PIN_Config pin_cfg = PIN_getConfig(pin);
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return (pin_cfg & PIN_BM_IRQ) == PIN_IRQ_DIS;
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}
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default: break;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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btn1_value(int type)
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{
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return button_value(type, BTN1_PIN, &btn1_timer);
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}
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/*---------------------------------------------------------------------------*/
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static int
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btn1_config(int type, int value)
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{
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return button_config(type, value, BTN1_PIN);
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}
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/*---------------------------------------------------------------------------*/
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static int
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btn1_status(int type)
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{
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return button_status(type, BTN1_PIN);
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}
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/*---------------------------------------------------------------------------*/
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static int
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btn2_value(int type)
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{
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return button_value(type, BTN2_PIN, &btn2_timer);
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}
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/*---------------------------------------------------------------------------*/
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static int
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btn2_config(int type, int value)
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{
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return button_config(type, value, BTN2_PIN);
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}
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/*---------------------------------------------------------------------------*/
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static int
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btn2_status(int type)
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{
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return button_status(type, BTN2_PIN);
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(button_left_sensor, BUTTON_SENSOR, btn1_value, btn1_config, btn1_status);
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SENSORS_SENSOR(button_right_sensor, BUTTON_SENSOR, btn2_value, btn2_config, btn2_status);
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/*---------------------------------------------------------------------------*/
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/** @} */
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