/*

  u8g_com_arduino_t6963.c

  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.

  PIN_D0 8
  PIN_D1 9
  PIN_D2 10
  PIN_D3 11
  PIN_D4 4
  PIN_D5 5
  PIN_D6 6
  PIN_D7 7

  PIN_CS 14
  PIN_A0 15
  PIN_RESET 16
  PIN_WR 17
  PIN_RD 18

  u8g_InitRW8Bit(u8g, dev, d0, d1, d2, d3, d4, d5, d6, d7, cs, a0, wr, rd, reset)
  u8g_InitRW8Bit(u8g, dev,  8,  9, 10, 11,  4,  5,  6,  7, 14, 15, 17, 18, 16)

  Update for ATOMIC operation done (01 Jun 2013)
    U8G_ATOMIC_OR(ptr, val)
    U8G_ATOMIC_AND(ptr, val)
    U8G_ATOMIC_START();
    U8G_ATOMIC_END();

*/

#include "u8g.h"

#if defined(ARDUINO) && !defined(ARDUINO_ARCH_STM32)

  #if ARDUINO < 100
    // #include <WProgram.h>
    #include <wiring_private.h>
    #include <pins_arduino.h>
  #else
    #include <Arduino.h>
  #endif

  #ifdef __PIC32MX
    // CHIPKIT PIC32
    typedef uint32_t u8g_data_t;
  #else
    typedef uint8_t u8g_data_t;
  #endif
  typedef u8g_data_t* u8g_ptr_t;

  static volatile u8g_ptr_t u8g_output_data_port[8];
  static volatile u8g_ptr_t u8g_input_data_port[8];
  static volatile u8g_ptr_t u8g_mode_port[8];
  static u8g_data_t u8g_data_mask[8];

  #ifdef ARDUINO_ARCH_SAM
    #define portModeRegister(port) ( &(port->PIO_OSR))
  #endif

  static void u8g_com_arduino_t6963_init(u8g_t *u8g) {
    u8g_output_data_port[0] = (u8g_ptr_t)portOutputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D0]));
    u8g_input_data_port[0] = (u8g_ptr_t)portInputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D0]));
    u8g_mode_port[0] = (u8g_ptr_t)portModeRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D0]));
    u8g_data_mask[0] = (u8g_data_t)digitalPinToBitMask(u8g->pin_list[U8G_PI_D0]);

    u8g_output_data_port[1] = (u8g_ptr_t)portOutputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D1]));
    u8g_input_data_port[1] = (u8g_ptr_t)portInputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D1]));
    u8g_mode_port[1] = (u8g_ptr_t)portModeRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D1]));
    u8g_data_mask[1] = (u8g_data_t)digitalPinToBitMask(u8g->pin_list[U8G_PI_D1]);

    u8g_output_data_port[2] = (u8g_ptr_t)portOutputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D2]));
    u8g_input_data_port[2] = (u8g_ptr_t)portInputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D2]));
    u8g_mode_port[2] = (u8g_ptr_t)portModeRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D2]));
    u8g_data_mask[2] = (u8g_data_t)digitalPinToBitMask(u8g->pin_list[U8G_PI_D2]);

    u8g_output_data_port[3] = (u8g_ptr_t)portOutputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D3]));
    u8g_input_data_port[3] = (u8g_ptr_t)portInputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D3]));
    u8g_mode_port[3] = (u8g_ptr_t)portModeRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D3]));
    u8g_data_mask[3] = (u8g_data_t)digitalPinToBitMask(u8g->pin_list[U8G_PI_D3]);

    u8g_output_data_port[4] = (u8g_ptr_t)portOutputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D4]));
    u8g_input_data_port[4] = (u8g_ptr_t)portInputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D4]));
    u8g_mode_port[4] = (u8g_ptr_t)portModeRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D4]));
    u8g_data_mask[4] = (u8g_data_t)digitalPinToBitMask(u8g->pin_list[U8G_PI_D4]);

    u8g_output_data_port[5] = (u8g_ptr_t)portOutputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D5]));
    u8g_input_data_port[5] = (u8g_ptr_t)portInputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D5]));
    u8g_mode_port[5] = (u8g_ptr_t)portModeRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D5]));
    u8g_data_mask[5] = (u8g_data_t)digitalPinToBitMask(u8g->pin_list[U8G_PI_D5]);

    u8g_output_data_port[6] = (u8g_ptr_t)portOutputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D6]));
    u8g_input_data_port[6] = (u8g_ptr_t)portInputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D6]));
    u8g_mode_port[6] = (u8g_ptr_t)portModeRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D6]));
    u8g_data_mask[6] = (u8g_data_t)digitalPinToBitMask(u8g->pin_list[U8G_PI_D6]);

    u8g_output_data_port[7] = (u8g_ptr_t)portOutputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D7]));
    u8g_input_data_port[7] = (u8g_ptr_t)portInputRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D7]));
    u8g_mode_port[7] = (u8g_ptr_t)portModeRegister(digitalPinToPort(u8g->pin_list[U8G_PI_D7]));
    u8g_data_mask[7] = (u8g_data_t)digitalPinToBitMask(u8g->pin_list[U8G_PI_D7]);
  }

  static void u8g_com_arduino_t6963_write_data_pin(uint8_t pin, uint8_t val) {
    // no ATOMIC protection required here, this is done by calling procedure
    if (val != 0)
      *u8g_output_data_port[pin] |= u8g_data_mask[pin];
    else
      *u8g_output_data_port[pin] &= ~u8g_data_mask[pin];
  }

  static void u8g_com_arduino_t6963_set_port_output(void) {
    uint8_t i;
    U8G_ATOMIC_START();
    for (i = 0; i < 8; i++) *u8g_mode_port[i] |= u8g_data_mask[i];
    U8G_ATOMIC_END();
  }

  static void u8g_com_arduino_t6963_set_port_input(void) {
    uint8_t i;
    U8G_ATOMIC_START();
    for ( i = 0; i < 8; i++ ) {
      *u8g_mode_port[i] &= ~u8g_data_mask[i];
      #if !defined(__PIC32MX) && defined(__AVR__)
        *u8g_output_data_port[i] &= ~u8g_data_mask[i]; // no pullup
      #endif
    }
    U8G_ATOMIC_END();
  }

  static void u8g_com_arduino_t6963_write(u8g_t *u8g, uint8_t val) {
    U8G_ATOMIC_START();

    u8g_com_arduino_t6963_write_data_pin( 0, val & 1 );
    val >>= 1;
    u8g_com_arduino_t6963_write_data_pin( 1, val & 1 );
    val >>= 1;
    u8g_com_arduino_t6963_write_data_pin( 2, val & 1 );
    val >>= 1;
    u8g_com_arduino_t6963_write_data_pin( 3, val & 1 );
    val >>= 1;

    u8g_com_arduino_t6963_write_data_pin( 4, val & 1 );
    val >>= 1;
    u8g_com_arduino_t6963_write_data_pin( 5, val & 1 );
    val >>= 1;
    u8g_com_arduino_t6963_write_data_pin( 6, val & 1 );
    val >>= 1;
    u8g_com_arduino_t6963_write_data_pin( 7, val & 1 );
    val >>= 1;
    U8G_ATOMIC_END();

    u8g_com_arduino_digital_write(u8g, U8G_PI_WR, 0);
    u8g_MicroDelay(); // 80ns, reference: t6963 datasheet
    u8g_com_arduino_digital_write(u8g, U8G_PI_WR, 1);
    u8g_MicroDelay(); // 10ns, reference: t6963 datasheet
  }

  static uint8_t u8g_com_arduino_t6963_read(u8g_t *u8g) {
    uint8_t val = 0;

    u8g_com_arduino_digital_write(u8g, U8G_PI_RD, 0);
    u8g_MicroDelay(); // 150ns, reference: t6963 datasheet

    U8G_ATOMIC_START();
    // only read bits 0, 1 and 3
    if ((*u8g_input_data_port[3] & u8g_data_mask[3]) != 0)
      val++;
    val <<= 1;
    val <<= 1;
    if ((*u8g_input_data_port[1] & u8g_data_mask[1]) != 0)
      val++;
    val <<= 1;
    if ((*u8g_input_data_port[0] & u8g_data_mask[0]) != 0)
      val++;
    U8G_ATOMIC_END();

    u8g_com_arduino_digital_write(u8g, U8G_PI_RD, 1);
    u8g_MicroDelay(); // 10ns, reference: t6963 datasheet

    return val;
  }

  #define U8G_STATUS_TIMEOUT 50

  static uint8_t u8g_com_arduino_t6963_until_01_ok(u8g_t *u8g) {
    long x;

    u8g_com_arduino_t6963_set_port_input();
    x = millis();
    x += U8G_STATUS_TIMEOUT;

    for (;;) {
      if ((u8g_com_arduino_t6963_read(u8g) & 3) == 3)
        break;
      if (x < millis())
        return 0;
    }
    u8g_com_arduino_t6963_set_port_output();
    return 1;
  }

  static uint8_t u8g_com_arduino_t6963_until_3_ok(u8g_t *u8g) {
    long x;

    u8g_com_arduino_t6963_set_port_input();
    x = millis();
    x += U8G_STATUS_TIMEOUT;

    for (;;) {
      if ((u8g_com_arduino_t6963_read(u8g) & 8) == 8)
        break;
      if (x < millis())
        return 0;
    }
    u8g_com_arduino_t6963_set_port_output();
    return 1;
  }

  static uint8_t u8g_com_arduino_t6963_write_cmd(u8g_t *u8g, uint8_t val) {
    u8g_com_arduino_digital_write(u8g, U8G_PI_A0, 1);
    if (u8g_com_arduino_t6963_until_01_ok(u8g) == 0)
      return 0;
    u8g_com_arduino_digital_write(u8g, U8G_PI_A0, 1);
    u8g_com_arduino_t6963_write(u8g, val);
    return 1;
  }

  static uint8_t u8g_com_arduino_t6963_write_data(u8g_t *u8g, uint8_t val) {
    u8g_com_arduino_digital_write(u8g, U8G_PI_A0, 1);
    if (u8g_com_arduino_t6963_until_01_ok(u8g) == 0)
      return 0;
    u8g_com_arduino_digital_write(u8g, U8G_PI_A0, 0);
    u8g_com_arduino_t6963_write(u8g, val);
    return 1;
  }

  static uint8_t u8g_com_arduino_t6963_write_auto_data(u8g_t *u8g, uint8_t val) {
    u8g_com_arduino_digital_write(u8g, U8G_PI_A0, 1);
    if (u8g_com_arduino_t6963_until_3_ok(u8g) == 0)
      return 0;
    u8g_com_arduino_digital_write(u8g, U8G_PI_A0, 0);
    u8g_com_arduino_t6963_write(u8g, val);
    return 1;
  }

  uint8_t u8g_com_arduino_t6963_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) {
    switch (msg) {
      case U8G_COM_MSG_INIT:
        u8g->pin_list[U8G_PI_A0_STATE] = 0;
        u8g_com_arduino_t6963_init(u8g);
        // setup the RW (equal to WR) pin as output and force it to high
        if (u8g->pin_list[U8G_PI_WR] != U8G_PIN_NONE) {
          pinMode(u8g->pin_list[U8G_PI_WR], OUTPUT);
          u8g_com_arduino_digital_write(u8g, U8G_PI_WR, HIGH);
        }
        // set all pins (except WR pin)
        u8g_com_arduino_assign_pin_output_high(u8g);
        break;
      case U8G_COM_MSG_STOP:
        break;

      case U8G_COM_MSG_CHIP_SELECT:
        if (arg_val == 0)
          // disable, active low chip select
          u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
        else
          // enable
          u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
        break;
      case U8G_COM_MSG_WRITE_BYTE:
        if (u8g->pin_list[U8G_PI_A0_STATE] == 0)
          u8g_com_arduino_t6963_write_data(u8g, arg_val);
        else
          u8g_com_arduino_t6963_write_cmd(u8g, arg_val);
        break;
      case U8G_COM_MSG_WRITE_SEQ: {
        register uint8_t *ptr = arg_ptr;
        u8g_com_arduino_t6963_write_cmd(u8g, 0x0b0); // auto write
        while (arg_val > 0) {
          if (u8g_com_arduino_t6963_write_auto_data(u8g, *ptr++) == 0)
            break;
          arg_val--;
        }
        u8g_com_arduino_t6963_write_cmd(u8g, 0x0b2); // auto reset
      }
      break;
      case U8G_COM_MSG_WRITE_SEQ_P: {
        register uint8_t *ptr = arg_ptr;
        u8g_com_arduino_t6963_write_cmd(u8g, 0x0b0); // auto write
        while (arg_val > 0) {
          if (u8g_com_arduino_t6963_write_auto_data(u8g, u8g_pgm_read(ptr)) == 0)
            break;
          ptr++;
          arg_val--;
        }
        u8g_com_arduino_t6963_write_cmd(u8g, 0x0b2); // auto reset
      }
      break;
      case U8G_COM_MSG_ADDRESS:                   // define cmd (arg_val = 1) or data mode (arg_val = 0)
        u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
        // u8g_com_arduino_digital_write(u8g, U8G_PI_DI, arg_val);
        break;
      case U8G_COM_MSG_RESET:
        if (u8g->pin_list[U8G_PI_RESET] != U8G_PIN_NONE)
          u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val);
        break;

    }
    return 1;
  }

#else // if defined(ARDUINO) && !defined(ARDUINO_ARCH_STM32)

  uint8_t u8g_com_arduino_t6963_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) {
    return 1;
  }

#endif /* ARDUINO */
