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205 lines
5.5 KiB
C
205 lines
5.5 KiB
C
/*
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* Copyright (c) 2008 Swedish Institute of Computer Science
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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 are met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of the copyright holders nor the names of
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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 "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, 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 OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* \brief
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* This file provides joystick operations. Combined with ADC functions.
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*
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* \author
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* Mike Vidales mavida404@gmail.com
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*
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*/
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#include "key.h"
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#include "uart.h"
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#include "main.h"
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#include "adc.h"
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/**
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* \addtogroup lcd
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* \{
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \brief This will intialize the joystick and the ADC for button readings.
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*/
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void
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key_init(void)
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{
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/* Disable digital input buffer for joystick signal */
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DIDR0 |= (1 << ADC1D);
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/* Enter is input w/pullup */
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ENTER_DDR &= ~(1<<ENTER_PIN);
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ENTER_PUR |= (1<<ENTER_PIN);
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/* Joystick is input wo/pullup (all though normal port function is overridden by ADC module when reading) */
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KEY_DDR &= ~(1<<KEY_PIN);
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KEY_PUR &= ~(1<<KEY_PIN);
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/* Get the ADC ready to use */
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adc_init(ADC_CHAN_ADC1, ADC_TRIG_FREE_RUN, ADC_REF_AVCC, ADC_PS_128);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief This will disable the ADC used for button readings.
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*/
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void
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key_deinit(void)
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{
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/* Turn off the ADC */
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adc_deinit();
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief This will poll run key_task() to determine if a button has been pressed.
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*
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* \retval True if button is pressed
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* \retval False if button is not pressed
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*/
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uint8_t
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is_button(void)
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{
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/* Return true if button has been pressed. */
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if (key_task() == KEY_NO_KEY){
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return false;
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}
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else{
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return true;
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief This function will wait for a user to press a button.
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*
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* \return retval Returns the global button state.
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*/
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uint8_t
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get_button(void)
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{
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uint8_t retval;
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while (!is_button())
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;
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retval = button;
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button = KEY_STATE_DONE;
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return retval;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief This will check the joystick state to return the current button status.
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*
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* \return button Current button state.
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*/
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key_state_t
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key_task(void)
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{
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key_state_t key_state;
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/* Check joystick state. Post event if any change since last */
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key_state = key_state_get();
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if (key_state == KEY_STATE_NO_KEY){
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if (button == KEY_STATE_DONE){
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button = KEY_STATE_NO_KEY;
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}
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return KEY_NO_KEY;
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}
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/* Key_state is button press code */
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if (button == KEY_STATE_DONE){
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/*
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* Button has already been used, don't return any more presses
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* until the button is released/re-pressed
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*/
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return KEY_NO_KEY;
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}
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/* Button has been pressed for the first time */
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button = key_state;
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return button;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief This function will start the ADC conversion and read the current
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* converstion value to determine the button position.
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*
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* \retval KEY_ENTER Enter button has been pressed.
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* \retval KEY_UP Up Button has been pressed.
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* \retval KEY_RIGHT Right Button has been pressed.
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* \retval KEY_LEFT Left Button has been pressed.
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* \retval KEY_DOWN Down Button has been pressed.
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* \retval KEY_NO_KEY No Button has been pressed.
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*/
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key_state_t
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key_state_get(void)
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{
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int16_t reading;
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/* Start the A/D conversion */
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adc_conversion_start();
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/* Wait for conversion to finish */
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while ((reading = adc_result_get(ADC_ADJ_RIGHT)) == EOF )
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;
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/* Determine which button (if any) is being pressed */
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if (!(ENTER_PORT & (1<<ENTER_PIN))){
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return KEY_ENTER;
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}
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if (reading < 0x00A0){
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return KEY_UP;
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}
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if (reading < 0x0180){
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return KEY_RIGHT;
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}
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if (reading < 0x0280){
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return KEY_LEFT;
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}
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if (reading < 0x0380){
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return KEY_DOWN;
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}
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return KEY_NO_KEY;
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}
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/** \} */
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