/******************************************************************************
 * The MIT License
 *
 * Copyright (c) 2010 Perry Hung.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *****************************************************************************/

/*
 * Arduino-compatible digital I/O implementation.
 */

#include "wirish.h"
#include "io.h"

void pinMode(uint8 pin, WiringPinMode mode) {
    gpio_pin_mode outputMode;
    boolean pwm = false;

    if (pin >= BOARD_NR_GPIO_PINS) {
        return;
    }

    switch(mode) {
    case OUTPUT:
        outputMode = GPIO_OUTPUT_PP;
        break;
    case OUTPUT_OPEN_DRAIN:
        outputMode = GPIO_OUTPUT_OD;
        break;
    case INPUT:
    case INPUT_FLOATING:
        outputMode = GPIO_INPUT_FLOATING;
        break;
    case INPUT_ANALOG:
        outputMode = GPIO_INPUT_ANALOG;
        break;
    case INPUT_PULLUP:
        outputMode = GPIO_INPUT_PU;
        break;
    case INPUT_PULLDOWN:
        outputMode = GPIO_INPUT_PD;
        break;
    case PWM:
        outputMode = GPIO_AF_OUTPUT_PP;
        pwm = true;
        break;
    case PWM_OPEN_DRAIN:
        outputMode = GPIO_AF_OUTPUT_OD;
        pwm = true;
        break;
    default:
        ASSERT(0);
        return;
    }

    gpio_set_mode(PIN_MAP[pin].gpio_device, PIN_MAP[pin].gpio_bit, outputMode);

    if (PIN_MAP[pin].timer_device != NULL) {
        /* Enable/disable timer channels if we're switching into or
         * out of PWM. */
        timer_set_mode(PIN_MAP[pin].timer_device,
                       PIN_MAP[pin].timer_channel,
                       pwm ? TIMER_PWM : TIMER_DISABLED);
    }
}


uint32 digitalRead(uint8 pin) {
    if (pin >= BOARD_NR_GPIO_PINS) {
        return 0;
    }

    return gpio_read_bit(PIN_MAP[pin].gpio_device, PIN_MAP[pin].gpio_bit) ?
        HIGH : LOW;
}

void digitalWrite(uint8 pin, uint8 val) {
    if (pin >= BOARD_NR_GPIO_PINS) {
        return;
    }

    gpio_write_bit(PIN_MAP[pin].gpio_device, PIN_MAP[pin].gpio_bit, val);
}

void togglePin(uint8 pin) {
    if (pin >= BOARD_NR_GPIO_PINS) {
        return;
    }

    gpio_toggle_bit(PIN_MAP[pin].gpio_device, PIN_MAP[pin].gpio_bit);
}

#define BUTTON_DEBOUNCE_DELAY 1

uint8 isButtonPressed() {
    if (digitalRead(BOARD_BUTTON_PIN)) {
        delay(BUTTON_DEBOUNCE_DELAY);
        while (digitalRead(BOARD_BUTTON_PIN))
            ;
        return true;
    }
    return false;
}

uint8 waitForButtonPress(uint32 timeout) {
    uint32 start = millis();
    uint32 time;
    if (timeout == 0) {
        while (!isButtonPressed())
            ;
        return true;
    }
    do {
        time = millis();
        /* properly handle wrap-around */
        if ((start > time && time + (0xffffffffU - start) > timeout) ||
            time - start > timeout) {
            return false;
        }
    } while (!isButtonPressed());
    return true;
}
