/*
  u8x8_d_st7586s_erc240160.c
  Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
  Copyright (c) 2018, 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 "u8g2.h"


static const uint8_t u8x8_d_st7586s_sleep_on[] = {
  U8X8_START_TRANSFER(),  /* enable chip, delay is part of the transfer start */
  U8X8_C(0x010), /* set power save mode */
  U8X8_END_TRANSFER(),  /* disable chip */
  U8X8_END()                  /* end of sequence */
};

static const uint8_t u8x8_d_st7586s_sleep_off[] = {
  U8X8_START_TRANSFER(),  /* enable chip, delay is part of the transfer start */
  U8X8_C(0x011), //Sleep out
  U8X8_DLY(50), /* delay 50 ms */
  U8X8_END_TRANSFER(),  /* disable chip */
  U8X8_END()                  /* end of sequence */
};

static const uint8_t u8x8_d_st7586s_erc240160_flip0_seq[] = {
  U8X8_START_TRANSFER(),             	/* enable chip, delay is part of the transfer start */
  U8X8_C(0x036),  /* Scan Direction Setting */
  U8X8_A(0x0C8),	/* COM159 -> COM0 SEG383 -> SEG0 */
  U8X8_C(0x037),	/* Start line 0 */
  U8X8_A(0x000),
  U8X8_C(0x02A), /* Column Address Setting */
  U8X8_A(0x000),  /* COL8 -> COL127 */
  U8X8_A(0x008),  
  U8X8_A(0x000), 
  U8X8_A(0x07F),  /* 120*3=240 pixels + 120 unused */
  U8X8_END_TRANSFER(),  /* disable chip */
  U8X8_END()           	/* end of sequence */
};

static const uint8_t u8x8_d_st7586s_erc240160_flip1_seq[] = {
  U8X8_START_TRANSFER(),             	/* enable chip, delay is part of the transfer start */
  U8X8_C(0x036),  /* Scan Direction Setting */
  U8X8_A(0x000),  /* COM0 -> COM159 SEG0 -> SEG383 */
  U8X8_C(0x037),  /* Start line 0 */
  U8X8_A(0x000),
  U8X8_C(0x02A),  /* Column Address Setting */
  U8X8_A(0x000),  /* COL0 -> COL119 */
  U8X8_A(0x000),
  U8X8_A(0x000),
  U8X8_A(0x077),  /* 120*3=240 pixels + 120 unused */
  U8X8_END_TRANSFER(),  /* disable chip */
  U8X8_END()            /* end of sequence */
};

static const uint8_t u8x8_d_st7586s_erc240160_init_seq[] = {
  U8X8_END_TRANSFER(),/* disable chip */
 // U8G_ESC_RST(1), /* hardware reset */
  U8X8_DLY(60),   /* Delay 60 ms */
  U8X8_START_TRANSFER(),/* enable chip */

  U8X8_C(0x001), // Soft reset
  U8X8_DLY(60), // Delay 120 ms

  U8X8_C(0x011), // Sleep Out
  U8X8_C(0x028), // Display OFF
  U8X8_DLY(25), // Delay 50 ms

  U8X8_CAA(0x0C0,0x036,0x01),// Vop = 136h data sheet suggested 0x0145 but this caused streaks

  U8X8_CA(0x0C3,0x000), // BIAS = 1/14

  U8X8_CA(0x0C4,0x007), // Booster = x8

  U8X8_CA(0x0D0,0x01D), // Enable Analog Circuit

  U8X8_CA(0x0B3,0x000), // Set FOSC divider

  U8X8_CA(0x0B5,0x000), // N-Line = 0

  U8X8_C(0x039), // 0x39 Monochrome mode. 0x38 - gray Mode

  U8X8_C(0x03A), // Enable DDRAM Interface
  U8X8_A(0x002), // monochrome and 4-level

  U8X8_C(0x036), // Scan Direction Setting
  U8X8_A(0x0C8), // COM:C159->C0   SEG: SEG383->SEG0

  U8X8_C(0x0B1), // First output COM
  U8X8_A(0x000), // 
  
  U8X8_C(0x0B0), // Duty Setting (num rows - 1)
  U8X8_A(0x09F), 

  U8X8_C(0x020), // Display inversion off

  U8X8_C(0x02A), // Column Address Setting
  U8X8_A(0x000), // COL0 -> COL127
  U8X8_A(0x008), // 
  U8X8_A(0x000), //
  U8X8_A(0x07F), // 80*3=240 pixels

  U8X8_C(0x02B), // Row Address Setting
  U8X8_A(0x000), // ROW0 -> ROW159
  U8X8_A(0x000), //
  U8X8_A(0x000), //
  U8X8_A(0x09F), // 160 pixels

  U8X8_C(0x029), // Display ON
  U8X8_END()  /* end of sequence */
};

static const u8x8_display_info_t u8x8_st7586s_erc240160_display_info =
{
  /* chip_enable_level = */ 0,
  /* chip_disable_level = */ 1,

  /* post_chip_enable_wait_ns = */ 5,
  /* pre_chip_disable_wait_ns = */ 5,
  /* reset_pulse_width_ms = */ 1,
  /* post_reset_wait_ms = */ 6,
  /* sda_setup_time_ns = */ 20,
  /* sck_pulse_width_ns = */  100,  /* datasheet ST7586S */
  /* sck_clock_hz = */ 8000000UL, /* since Arduino 1.6.0, the SPI bus speed in Hz. Should be  1000000000/sck_pulse_width_ns */
  /* ST7586+Atmega128RFA1 works with 8MHz */
  /* spi_mode = */ 3,   /* active high, rising edge */
  /* i2c_bus_clock_100kHz = */ 4,
  /* data_setup_time_ns = */ 20, /* datasheet suggests min 20 */
  /* write_pulse_width_ns = */ 40,
  /* tile_width = */ 30,
  /* tile_height = */ 20,
  /* default_x_offset = */ 0,  /* abused as flag to know if we are flipped */
  /* flipmode_x_offset = */ 1, /* as pixel order different for normal/flipped  */
  /* pixel_width = */ 240,
  /* pixel_height = */ 160
};

/*******************************************************************************
 * st7586s_erc240160 driver. ST7586 based display from buydisplay.com
 ******************************************************************************/
uint8_t u8x8_d_st7586s_erc240160(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) {
  
  uint8_t c;
  uint8_t *ptr;
  uint8_t i, byte;
  uint32_t input;
  uint8_t output[4];
  switch (msg) {
    case U8X8_MSG_DISPLAY_DRAW_TILE:
    u8x8_cad_StartTransfer(u8x8); // OK Start transfer
    u8x8_cad_SendCmd(u8x8, 0x02B);  /* Row Address Setting */
    u8x8_cad_SendArg(u8x8, 0x000);
    u8x8_cad_SendArg(u8x8, 0x008 * ((u8x8_tile_t *)arg_ptr)->y_pos);
    u8x8_cad_SendArg(u8x8, 0x000);
    u8x8_cad_SendArg(u8x8, 0x09F); // should set end row based on display dimensions
    u8x8_cad_SendCmd(u8x8, 0x02C);  /* cmd write display data to ram */
    c = ((u8x8_tile_t *) arg_ptr)->cnt; //
    c *= 8;
    ptr = ((u8x8_tile_t *) arg_ptr)->tile_ptr;  //

// The ST7586S has an unusual 3 pixels per byte format the ERC240160 is even more annoying
// as it has every 3rd COM line disconnected for extra oddness so here we read in a byte 
// (8 pixels) and pack that into 4 bytes of 2 pixels + 1 unused each. This has to be done
// in a different order for flipped, normal UUx11x22 flipped 11x22xUU
	while (c > 0) {
      input = ((uint8_t)ptr[0]);
      
      for (i=0; i<4; i++)
      {
        byte = 0;
        if (u8x8->x_offset ==0){
          if (input & 0x80)          // if bit 7
            byte = byte | 0b00011000;  //set pixel 1
          if (input & 0x40)          // if bit 6
            byte = byte | 0b00000011;  //set pixel 2
        }
        if (u8x8->x_offset ==1){
          if (input & 0x80)          // if bit 7
            byte = byte | 0b11000000;  //set pixel 1
          if (input & 0x40)          // if bit 6
            byte = byte | 0b00011000;  //set pixel 2
        }
        output[i] = byte;
        input <<= 2;
      }
      
      u8x8_cad_SendData(u8x8, 4, output);
      ptr += 1;
      c -= 1;
    }
    u8x8_cad_EndTransfer(u8x8); 
    break;
  case U8X8_MSG_DISPLAY_INIT:
    u8x8_d_helper_display_init(u8x8);
    u8x8_cad_SendSequence(u8x8, u8x8_d_st7586s_erc240160_init_seq);
    break;
  case U8X8_MSG_DISPLAY_SETUP_MEMORY:
    u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7586s_erc240160_display_info);
    break;
  case U8X8_MSG_DISPLAY_SET_FLIP_MODE:
  	if ( arg_int == 0 )
    {
       u8x8_cad_SendSequence(u8x8, u8x8_d_st7586s_erc240160_flip0_seq);
       u8x8->x_offset = u8x8->display_info->default_x_offset;
    }
    else
    {
      u8x8_cad_SendSequence(u8x8, u8x8_d_st7586s_erc240160_flip1_seq);
      u8x8->x_offset = u8x8->display_info->flipmode_x_offset;
    }	
    break;
  case U8X8_MSG_DISPLAY_SET_POWER_SAVE:
    if (arg_int == 0)
      u8x8_cad_SendSequence(u8x8, u8x8_d_st7586s_sleep_off);
    else
      u8x8_cad_SendSequence(u8x8, u8x8_d_st7586s_sleep_on);
    break;
#ifdef U8X8_WITH_SET_CONTRAST
  case U8X8_MSG_DISPLAY_SET_CONTRAST:
    u8x8_cad_StartTransfer(u8x8);
    u8x8_cad_SendCmd(u8x8, 0x0C0);
    u8x8_cad_SendArg(u8x8, arg_int);
    u8x8_cad_SendArg(u8x8, 1);
    u8x8_cad_EndTransfer(u8x8);
    break;
#endif
  default:
    return 0;
  }
  return 1;
}
