/***************************************************************************
 *   Copyright (C) 2024 by Federico Amedeo Izzo IU2NUO,                    *
 *                         Niccolò Izzo IU2KIN                             *
 *                         Frederik Saraci IU2NRO                          *
 *                         Silvano Seva IU2KWO                             *
 *                         Dual Tachyon                                    *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, see <http://www.gnu.org/licenses/>   *
 ***************************************************************************/

#include <peripherals/gpio.h>
#include <interfaces/delays.h>
#include <interfaces/keyboard.h>
#include "hwconfig.h"


void kbd_init()
{
    /* Set the two column lines as outputs */
    gpio_setMode(KBD_COL0, OUTPUT);
    gpio_setMode(KBD_COL1, OUTPUT);
    gpio_setMode(KBD_COL2, OUTPUT);
    gpio_setMode(KBD_COL3, OUTPUT);

    gpio_setMode(KBD_ROW0, INPUT_PULL_UP);
    gpio_setMode(KBD_ROW1, INPUT_PULL_UP);
    gpio_setMode(KBD_ROW2, INPUT_PULL_UP);
    gpio_setMode(KBD_ROW3, INPUT_PULL_UP);
    gpio_setMode(SKB_1,    INPUT_PULL_UP);

    gpio_setPin(KBD_COL0);
    gpio_setPin(KBD_COL1);
    gpio_setPin(KBD_COL2);
    gpio_setPin(KBD_COL3);
}

void kbd_terminate()
{
    /* Back to default state */
    gpio_clearPin(KBD_COL0);
    gpio_clearPin(KBD_COL1);
    gpio_clearPin(KBD_COL2);
    gpio_clearPin(KBD_COL3);
    gpio_setMode(KBD_COL0, INPUT);
    gpio_setMode(KBD_COL1, INPUT);
    gpio_setMode(KBD_COL2, INPUT);
    gpio_setMode(KBD_COL3, INPUT);
}

keyboard_t kbd_getKeys()
{
    keyboard_t keys = 0;

    if(!gpio_readPin(SKB_1)) keys |= KEY_MONI;

    gpio_setPin(KBD_COL3);
    gpio_clearPin(KBD_COL0);

    delayUs(10);
    if(!gpio_readPin(KBD_ROW0)) keys |= KEY_ENTER;
    if(!gpio_readPin(KBD_ROW1)) keys |= KEY_UP;
    if(!gpio_readPin(KBD_ROW2)) keys |= KEY_DOWN;
    if(!gpio_readPin(KBD_ROW3)) keys |= KEY_ESC;

    gpio_clearPin(KBD_COL1);
    gpio_setPin(KBD_COL0);

    delayUs(10);
    if(!gpio_readPin(KBD_ROW0)) keys |= KEY_1;
    if(!gpio_readPin(KBD_ROW1)) keys |= KEY_2;
    if(!gpio_readPin(KBD_ROW2)) keys |= KEY_3;
    if(!gpio_readPin(KBD_ROW3)) keys |= KEY_STAR;

    gpio_clearPin(KBD_COL2);
    gpio_setPin(KBD_COL1);

    delayUs(10);
    if(!gpio_readPin(KBD_ROW0)) keys |= KEY_4;
    if(!gpio_readPin(KBD_ROW1)) keys |= KEY_5;
    if(!gpio_readPin(KBD_ROW2)) keys |= KEY_6;
    if(!gpio_readPin(KBD_ROW3)) keys |= KEY_0;

    gpio_clearPin(KBD_COL3);
    gpio_setPin(KBD_COL2);

    delayUs(10);
    if(!gpio_readPin(KBD_ROW0)) keys |= KEY_7;
    if(!gpio_readPin(KBD_ROW1)) keys |= KEY_8;
    if(!gpio_readPin(KBD_ROW2)) keys |= KEY_9;
    if(!gpio_readPin(KBD_ROW3)) keys |= KEY_HASH;

    return keys;
}