/*

  u8g_dev_st7920_128x64.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.

*/

#include "u8g.h"

#define WIDTH 128
#define HEIGHT 64
#define PAGE_HEIGHT 8

// init sequence from https://github.com/adafruit/ST7565-LCD/blob/master/ST7565/ST7565.cpp
static const uint8_t u8g_dev_st7920_128x64_init_seq[] PROGMEM = {
  U8G_ESC_CS(0),             // disable chip
  U8G_ESC_ADR(0),           // instruction mode
  U8G_ESC_RST(15),           // do reset low pulse with (15*16)+2 milliseconds (=maximum delay)
  U8G_ESC_DLY(100),         // 8 Dez 2012: additional delay 100 ms because of reset
  U8G_ESC_CS(1),             // enable chip
  U8G_ESC_DLY(50),         // delay 50 ms

  0x038,                                // 8 Bit interface (DL=1), basic instruction set (RE=0)
  0x00c,                                // display on, cursor & blink off; 0x08: all off
  0x006,                                // Entry mode: Cursor move to right ,DDRAM address counter (AC) plus 1, no shift
  0x002,                                // disable scroll, enable CGRAM adress
  0x001,                                // clear RAM, needs 1.6 ms
  U8G_ESC_DLY(100),               // delay 100 ms

  U8G_ESC_CS(0),             // disable chip
  U8G_ESC_END                // end of sequence
};

static const uint8_t u8g_dev_st7920_128x64_sleep_on[] PROGMEM = {
  U8G_ESC_ADR(0),           // instruction mode
  U8G_ESC_CS(1),            // enable chip
  0x038,                    // 8 Bit interface (DL=1), basic instruction set (RE=0)
  0x008,                    // display off
  0x034,                    // 8 Bit interface (DL=1), extended instruction set (RE=1)
  0x001,                    // Standby mode
  U8G_ESC_CS(0),            // disable chip
  U8G_ESC_END               // end of sequence
};

static const uint8_t u8g_dev_st7920_128x64_sleep_off[] PROGMEM = {
  U8G_ESC_ADR(0),           // instruction mode
  U8G_ESC_CS(1),            // enable chip
  0x038,                    // 8 Bit interface (DL=1), basic instruction set (RE=0)
  0x00c,                    // display on, cursor & blink off
  U8G_ESC_CS(0),            // disable chip
  U8G_ESC_END               // end of sequence
};

uint8_t u8g_dev_st7920_128x64_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg) {
  switch (msg) {
    case U8G_DEV_MSG_INIT:
      u8g_InitCom(u8g, dev, U8G_SPI_CLK_CYCLE_400NS);
      u8g_WriteEscSeqP(u8g, dev, u8g_dev_st7920_128x64_init_seq);
      break;
    case U8G_DEV_MSG_STOP:
      break;
    case U8G_DEV_MSG_PAGE_NEXT: {
      uint8_t y, i;
      uint8_t *ptr;
      u8g_pb_t *pb = (u8g_pb_t *)(dev->dev_mem);

      u8g_SetAddress(u8g, dev, 0);             // cmd mode
      u8g_SetChipSelect(u8g, dev, 1);
      y = pb->p.page_y0;
      ptr = pb->buf;
      for ( i = 0; i < 8; i++ ) {
        u8g_SetAddress(u8g, dev, 0);             // cmd mode
        u8g_WriteByte(u8g, dev, 0x03e );        // enable extended mode

        if (y < 32) {
          u8g_WriteByte(u8g, dev, 0x080 | y );              // y pos
          u8g_WriteByte(u8g, dev, 0x080  );              // set x pos to 0
        }
        else {
          u8g_WriteByte(u8g, dev, 0x080 | (y - 32));             // y pos
          u8g_WriteByte(u8g, dev, 0x080 | 8);              // set x pos to 64
        }

        u8g_SetAddress(u8g, dev, 1);                    // data mode
        u8g_WriteSequence(u8g, dev, WIDTH / 8, ptr);
        ptr += WIDTH / 8;
        y++;
      }
      u8g_SetChipSelect(u8g, dev, 0);
    }
    break;
    case U8G_DEV_MSG_SLEEP_ON:
      u8g_WriteEscSeqP(u8g, dev, u8g_dev_st7920_128x64_sleep_on);
      return 1;
    case U8G_DEV_MSG_SLEEP_OFF:
      u8g_WriteEscSeqP(u8g, dev, u8g_dev_st7920_128x64_sleep_off);
      return 1;
  }
  return u8g_dev_pb8h1_base_fn(u8g, dev, msg, arg);
}

uint8_t u8g_dev_st7920_128x64_4x_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg) {
  switch (msg) {
    case U8G_DEV_MSG_INIT:
      u8g_InitCom(u8g, dev, U8G_SPI_CLK_CYCLE_400NS);
      u8g_WriteEscSeqP(u8g, dev, u8g_dev_st7920_128x64_init_seq);
      break;
    case U8G_DEV_MSG_STOP:
      break;
    case U8G_DEV_MSG_PAGE_NEXT: {
      uint8_t y, i;
      uint8_t *ptr;
      u8g_pb_t *pb = (u8g_pb_t *)(dev->dev_mem);

      u8g_SetAddress(u8g, dev, 0);             // cmd mode
      u8g_SetChipSelect(u8g, dev, 1);
      y = pb->p.page_y0;
      ptr = pb->buf;
      for ( i = 0; i < 32; i++ ) {
        u8g_SetAddress(u8g, dev, 0);             // cmd mode
        u8g_WriteByte(u8g, dev, 0x03e );        // enable extended mode

        if (y < 32) {
          u8g_WriteByte(u8g, dev, 0x080 | y );              // y pos
          u8g_WriteByte(u8g, dev, 0x080  );              // set x pos to 0
        }
        else {
          u8g_WriteByte(u8g, dev, 0x080 | (y - 32));             // y pos
          u8g_WriteByte(u8g, dev, 0x080 | 8);              // set x pos to 64
        }

        u8g_SetAddress(u8g, dev, 1);                    // data mode
        u8g_WriteSequence(u8g, dev, WIDTH / 8, ptr);
        ptr += WIDTH / 8;
        y++;
      }
      u8g_SetChipSelect(u8g, dev, 0);
    }
    break;
    case U8G_DEV_MSG_SLEEP_ON:
      u8g_WriteEscSeqP(u8g, dev, u8g_dev_st7920_128x64_sleep_on);
      return 1;
    case U8G_DEV_MSG_SLEEP_OFF:
      u8g_WriteEscSeqP(u8g, dev, u8g_dev_st7920_128x64_sleep_off);
      return 1;
  }
  return u8g_dev_pb32h1_base_fn(u8g, dev, msg, arg);
}

U8G_PB_DEV(u8g_dev_st7920_128x64_sw_spi, WIDTH, HEIGHT, PAGE_HEIGHT, u8g_dev_st7920_128x64_fn, U8G_COM_ST7920_SW_SPI);
U8G_PB_DEV(u8g_dev_st7920_128x64_hw_spi, WIDTH, HEIGHT, PAGE_HEIGHT, u8g_dev_st7920_128x64_fn, U8G_COM_ST7920_HW_SPI);
U8G_PB_DEV(u8g_dev_st7920_128x64_8bit, WIDTH, HEIGHT, PAGE_HEIGHT, u8g_dev_st7920_128x64_fn, U8G_COM_FAST_PARALLEL);
U8G_PB_DEV(u8g_dev_st7920_128x64_custom, WIDTH, HEIGHT, PAGE_HEIGHT, u8g_dev_st7920_128x64_fn, u8g_com_arduino_st7920_custom_fn);

#define QWIDTH (WIDTH * 4)
uint8_t u8g_dev_st7920_128x64_4x_buf[QWIDTH] U8G_NOCOMMON;
u8g_pb_t u8g_dev_st7920_128x64_4x_pb = { {32, HEIGHT, 0, 0, 0},  WIDTH, u8g_dev_st7920_128x64_4x_buf};
u8g_dev_t u8g_dev_st7920_128x64_4x_sw_spi = { u8g_dev_st7920_128x64_4x_fn, &u8g_dev_st7920_128x64_4x_pb, U8G_COM_ST7920_SW_SPI };
u8g_dev_t u8g_dev_st7920_128x64_4x_hw_spi = { u8g_dev_st7920_128x64_4x_fn, &u8g_dev_st7920_128x64_4x_pb, U8G_COM_ST7920_HW_SPI };
u8g_dev_t u8g_dev_st7920_128x64_4x_8bit = { u8g_dev_st7920_128x64_4x_fn, &u8g_dev_st7920_128x64_4x_pb, U8G_COM_FAST_PARALLEL };
u8g_dev_t u8g_dev_st7920_128x64_4x_custom = { u8g_dev_st7920_128x64_4x_fn, &u8g_dev_st7920_128x64_4x_pb, u8g_com_arduino_st7920_custom_fn };
