/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * 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/>.
 *
 */

/**
 * Based on u8g_com_arduino_ssd_i2c.c
 *
 * COM interface for Arduino (AND ATmega) and the SSDxxxx chip (SOLOMON) variant
 * I2C protocol
 *
 * Universal 8bit Graphics Library
 *
 * Copyright (c) 2011, olikraus@gmail.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice, this list
 *    of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright notice, this
 *    list of conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * Special pin usage:
 * U8G_PI_I2C_OPTION additional options
 * U8G_PI_A0_STATE used to store the last value of the command/data register selection
 * U8G_PI_SET_A0   1: Signal request to update I2C device with new A0_STATE, 0: Do nothing, A0_STATE matches I2C device
 * U8G_PI_SCL    clock line (NOT USED)
 * U8G_PI_SDA    data line (NOT USED)
 *
 * U8G_PI_RESET    reset line (currently disabled, see below)
 *
 * Protocol:
 * SLA, Cmd/Data Selection, Arguments
 * The command/data register is selected by a special instruction byte, which is sent after SLA
 *
 * The continue bit is always 0 so that a (re)start is equired for the change from cmd to/data mode
 */

#ifdef TARGET_LPC1768

#include "../../../inc/MarlinConfigPre.h"

#if HAS_GRAPHICAL_LCD

#include <U8glib.h>

#define I2C_SLA         (0x3C*2)
//#define I2C_CMD_MODE  0x080
#define I2C_CMD_MODE    0x000
#define I2C_DATA_MODE   0x040

//#define U8G_I2C_OPT_FAST 16

uint8_t u8g_com_ssd_I2C_start_sequence(u8g_t *u8g) {
  /* are we requested to set the a0 state? */
  if (u8g->pin_list[U8G_PI_SET_A0] == 0) return 1;

  /* setup bus, might be a repeated start */
  if (u8g_i2c_start(I2C_SLA) == 0) return 0;
  if (u8g->pin_list[U8G_PI_A0_STATE] == 0) {
    if (u8g_i2c_send_byte(I2C_CMD_MODE) == 0) return 0;
  }
  else if (u8g_i2c_send_byte(I2C_DATA_MODE) == 0)
    return 0;

  u8g->pin_list[U8G_PI_SET_A0] = 0;
  return 1;
}

uint8_t u8g_com_HAL_LPC1768_ssd_hw_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) {
  switch (msg) {
    case U8G_COM_MSG_INIT:
      //u8g_com_arduino_digital_write(u8g, U8G_PI_SCL, HIGH);
      //u8g_com_arduino_digital_write(u8g, U8G_PI_SDA, HIGH);
      //u8g->pin_list[U8G_PI_A0_STATE] = 0;       /* inital RS state: unknown mode */

      u8g_i2c_init(u8g->pin_list[U8G_PI_I2C_OPTION]);
      u8g_com_ssd_I2C_start_sequence(u8g);
      break;

    case U8G_COM_MSG_STOP:
      break;

    case U8G_COM_MSG_RESET:
      /* Currently disabled, but it could be enable. Previous restrictions have been removed */
      /* u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val); */
      break;

    case U8G_COM_MSG_CHIP_SELECT:
      u8g->pin_list[U8G_PI_A0_STATE] = 0;
      u8g->pin_list[U8G_PI_SET_A0] = 1;   /* force a0 to set again, also forces start condition */
      if (arg_val == 0 ) {
        /* disable chip, send stop condition */
        u8g_i2c_stop();
      }
      else {
        /* enable, do nothing: any byte writing will trigger the i2c start */
      }
      break;

    case U8G_COM_MSG_WRITE_BYTE:
      //u8g->pin_list[U8G_PI_SET_A0] = 1;
      if (u8g_com_ssd_I2C_start_sequence(u8g) == 0) {
        u8g_i2c_stop();
        return 0;
      }

      if (u8g_i2c_send_byte(arg_val) == 0) {
        u8g_i2c_stop();
        return 0;
      }
      // u8g_i2c_stop();
      break;

    case U8G_COM_MSG_WRITE_SEQ: {
        //u8g->pin_list[U8G_PI_SET_A0] = 1;
        if (u8g_com_ssd_I2C_start_sequence(u8g) == 0) {
         u8g_i2c_stop();
         return 0;
        }

        uint8_t *ptr = (uint8_t *)arg_ptr;
        while (arg_val > 0) {
          if (u8g_i2c_send_byte(*ptr++) == 0) {
            u8g_i2c_stop();
            return 0;
          }
          arg_val--;
        }
      }
      // u8g_i2c_stop();
      break;

    case U8G_COM_MSG_WRITE_SEQ_P: {
        //u8g->pin_list[U8G_PI_SET_A0] = 1;
        if (u8g_com_ssd_I2C_start_sequence(u8g) == 0) {
          u8g_i2c_stop();
          return 0;
        }

        uint8_t *ptr = (uint8_t *)arg_ptr;
        while (arg_val > 0) {
          if (u8g_i2c_send_byte(u8g_pgm_read(ptr)) == 0)
            return 0;
          ptr++;
          arg_val--;
        }
      }
      // u8g_i2c_stop();
      break;

    case U8G_COM_MSG_ADDRESS:                     /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
      u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
      u8g->pin_list[U8G_PI_SET_A0] = 1;   /* force a0 to set again */
      break;

  } // switch
  return 1;
}

#endif // HAS_GRAPHICAL_LCD

#endif // TARGET_LPC1768
