Firmware2/Marlin/src/HAL/HAL_LPC1768/u8g_com_HAL_LPC1768_ssd_hw_i2c.cpp

/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2016, 2017 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

  ToDo: Rename this to u8g_com_avr_ssd_i2c.c

  Universal 8bit Graphics Library

  Copyright (c) 2012, 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 <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_arduino_ssd_start_sequence(u8g) == 0 )
//            return u8g_i2c_stop(), 0;
        if ( u8g_i2c_send_byte(arg_val) == 0 )
          return u8g_i2c_stop(), 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 )
          return u8g_i2c_stop(), 0;
        {
          register uint8_t *ptr = (uint8_t *)arg_ptr;
          while (arg_val > 0) {
            if ( u8g_i2c_send_byte(*ptr++) == 0 )
              return u8g_i2c_stop(), 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 )
          return u8g_i2c_stop(), 0;
        {
          register 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 */

        u8g_i2c_start(0); // send slave address and write bit
        if (arg_val)
          u8g_i2c_send_byte(0x40);  // write to graphics DRAM mode
        else
          u8g_i2c_send_byte(0x80);  //command mode
        break;
    }
    return 1;
  }

#endif // TARGET_LPC1768