/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
 *
 * 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.
 */

#include <string.h>
#include <stdbool.h>

#include "nrf.h"

#include "boards/board.h"

#if 0
#include "common-hal/microcontroller/Pin.h"
#include "hal/include/hal_gpio.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "shared-bindings/neopixel_write/__init__.h"
#endif

// Must match temp register in bootloader
#define BOOTLOADER_VERSION_REGISTER     NRF_TIMER2->CC[0]
uint32_t bootloaderVersion = 0;

volatile uint32_t ticks_ms = 0;

#define HAL_LFCLK_FREQ (32768UL)
#define HAL_RTC_FREQ   (1024UL)
#define HAL_RTC_COUNTER_PRESCALER ((HAL_LFCLK_FREQ/HAL_RTC_FREQ)-1)

/* Maximum RTC ticks */
#define portNRF_RTC_MAXTICKS   ((1U<<24)-1U)

void board_init(void)
{
  // Retrieve bootloader version
  bootloaderVersion = BOOTLOADER_VERSION_REGISTER;

  // 32Khz XTAL
  NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
  NRF_CLOCK->TASKS_LFCLKSTART = 1UL;

  // Set up RTC1 as tick timer
  NVIC_DisableIRQ(RTC1_IRQn);
  NRF_RTC1->EVTENCLR    = RTC_EVTEN_COMPARE0_Msk;
  NRF_RTC1->INTENCLR    = RTC_INTENSET_COMPARE0_Msk;
  NRF_RTC1->TASKS_STOP  = 1;
  NRF_RTC1->TASKS_CLEAR = 1;

  ticks_ms = 0;

  NRF_RTC1->PRESCALER = HAL_RTC_COUNTER_PRESCALER;
  NRF_RTC1->INTENSET = RTC_INTENSET_TICK_Msk;
  NRF_RTC1->TASKS_START = 1;
  NRF_RTC1->EVTENSET = RTC_EVTEN_OVRFLW_Msk;
  NVIC_SetPriority(RTC1_IRQn, 0xf); // lowest priority
  NVIC_EnableIRQ(RTC1_IRQn);
}

void RTC1_IRQHandler(void)
{
  // Clear event
  NRF_RTC1->EVENTS_TICK = 0;
  volatile uint32_t dummy = NRF_RTC1->EVENTS_TICK;
  (void) dummy;

  // Tick correction
  uint32_t systick_counter = NRF_RTC1->COUNTER;
  uint32_t diff = (systick_counter - ticks_ms) & portNRF_RTC_MAXTICKS;
  ticks_ms += diff;
}

// Check the status of the two buttons on CircuitPlayground Express. If both are
// pressed, then boot into user safe mode.
bool board_requests_safe_mode(void) {
//    gpio_set_pin_function(PIN_PA14, GPIO_PIN_FUNCTION_OFF);
//    gpio_set_pin_direction(PIN_PA14, GPIO_DIRECTION_IN);
//    gpio_set_pin_pull_mode(PIN_PA14, GPIO_PULL_DOWN);
//
//    gpio_set_pin_function(PIN_PA28, GPIO_PIN_FUNCTION_OFF);
//    gpio_set_pin_direction(PIN_PA28, GPIO_DIRECTION_IN);
//    gpio_set_pin_pull_mode(PIN_PA28, GPIO_PULL_DOWN);
//    bool safe_mode = gpio_get_pin_level(PIN_PA14) &&
//        gpio_get_pin_level(PIN_PA28);
//    reset_pin(PIN_PA14);
//    reset_pin(PIN_PA28);
//    return safe_mode;

  return false;
}

void reset_board(void) {
//    uint8_t empty[30];
//    memset(empty, 0, 30);
//    digitalio_digitalinout_obj_t neopixel_pin;
//    common_hal_digitalio_digitalinout_construct(&neopixel_pin, &pin_PB23);
//    common_hal_digitalio_digitalinout_switch_to_output(&neopixel_pin, false,
//        DRIVE_MODE_PUSH_PULL);
//    common_hal_neopixel_write(&neopixel_pin, empty, 30);
//    common_hal_digitalio_digitalinout_deinit(&neopixel_pin);
}