u8g2-copy/sys/arduino/u8g2_page_buffer/DirectAccess/DirectAccess.ino

/*

  DirectAccess.ino
  
  Demonstrate how to interact with the internal buffer directly
  Warning: This example will not work with all graphics controller.
  It will work with SSD13xx, UC1xxx, ST7656 controller
  It will definitly not work with ST7920, T6962, RA8835.

  Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)

  Copyright (c) 2016, 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 <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

/*
  U8glib Example Overview:
    Frame Buffer Examples: clearBuffer/sendBuffer. Fast, but may not work with all Arduino boards because of RAM consumption
    Page Buffer Examples: firstPage/nextPage. Less RAM usage, should work with all Arduino boards.
    U8x8 Text Only Example: No RAM usage, direct communication with display controller. No graphics, 8x8 Text only.
    
  This is a page buffer example.    
*/

// Please UNCOMMENT one of the contructor lines below
// U8g2 Contructor List (Picture Loop Page Buffer)
// The complete list is available here: https://github.com/olikraus/u8g2/wiki/u8g2setupcpp
// Please update the pin numbers according to your setup. Use U8X8_PIN_NONE if the reset pin is not connected
//U8G2_SSD1306_128X64_NONAME_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_SSD1306_128X64_NONAME_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 12, /* dc=*/ 4, /* reset=*/ 6);	// Arduboy (Production, Kickstarter Edition)
//U8G2_SSD1306_128X64_NONAME_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_SSD1306_128X64_NONAME_1_3W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* reset=*/ 8);
//U8G2_SSD1306_128X64_NONAME_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* reset=*/ 8);
//U8G2_SSD1306_128X64_NONAME_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);   // All Boards without Reset of the Display
//U8G2_SSD1306_128X64_NONAME_1_6800 u8g2(U8G2_R0, 13, 11, 2, 3, 4, 5, 6, A4, /*enable=*/ 7, /*cs=*/ 10, /*dc=*/ 9, /*reset=*/ 8);
//U8G2_SSD1306_128X64_NONAME_1_8080 u8g2(U8G2_R0, 13, 11, 2, 3, 4, 5, 6, A4, /*enable=*/ 7, /*cs=*/ 10, /*dc=*/ 9, /*reset=*/ 8);
//U8G2_SSD1306_128X64_VCOMH0_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);	// same as the NONAME variant, but maximizes setContrast() range
//U8G2_SH1106_128X64_NONAME_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_SH1106_128X64_VCOMH0_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);		// same as the NONAME variant, but maximizes setContrast() range
//U8G2_SSD1306_128X32_UNIVISION_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ 21, /* data=*/ 20, /* reset=*/ U8X8_PIN_NONE);   // Adafruit Feather M0 Basic Proto + FeatherWing OLED
//U8G2_SSD1306_128X32_UNIVISION_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);   // Adafruit Feather ESP8266/32u4 Boards + FeatherWing OLED
//U8G2_SSD1306_128X32_UNIVISION_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // Adafruit ESP8266/32u4/ARM Boards + FeatherWing OLED
//U8G2_SSD1306_64X48_ER_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // EastRising 0.66" OLED breakout board, Uno: A4=SDA, A5=SCL, 5V powered
//U8G2_SSD1322_NHD_256X64_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);	// Enable U8G2_16BIT in u8g2.h
//U8G2_SSD1322_NHD_256X64_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);	// Enable U8G2_16BIT in u8g2.h
//U8G2_SSD1325_NHD_128X64_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_SSD1325_NHD_128X64_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_SSD1327_SEEED_96X96_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);	// Seeedstudio Grove OLED 96x96
//U8G2_SSD1327_SEEED_96X96_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);	// Seeedstudio Grove OLED 96x96
//U8G2_SSD1305_128X32_NONAME_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_SSD1305_128X32_NONAME_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_SSD1309_128X64_NONAME_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);  
//U8G2_SSD1309_128X64_NONAME_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);  
//U8G2_LD7032_60X32_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 11, /* data=*/ 12, /* cs=*/ 9, /* dc=*/ 10, /* reset=*/ 8);	// SW SPI Nano Board
//U8G2_LD7032_60X32_1_4W_SW_I2C u8g2(U8G2_R0, /* clock=*/ 11, /* data=*/ 12, /* reset=*/ U8X8_PIN_NONE);	// NOT TESTED!
//U8G2_UC1701_EA_DOGS102_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_UC1701_EA_DOGS102_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_PCD8544_84X48_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);	// Nokia 5110 Display
//U8G2_PCD8544_84X48_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);						// Nokia 5110 Display
//U8G2_PCF8812_96X65_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);	// Could be also PCF8814
//U8G2_PCF8812_96X65_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);						// Could be also PCF8814
//U8G2_KS0108_128X64_1 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /*enable=*/ 18, /*dc=*/ 17, /*cs0=*/ 14, /*cs1=*/ 15, /*cs2=*/ U8X8_PIN_NONE, /* reset=*/  U8X8_PIN_NONE); 	// Set R/W to low!
//U8G2_KS0108_ERM19264_1 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /*enable=*/ 18, /*dc=*/ 17, /*cs0=*/ 14, /*cs1=*/ 15, /*cs2=*/ 16, /* reset=*/  U8X8_PIN_NONE); 	// Set R/W to low!
//U8G2_ST7920_192X32_1_8080 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /*enable=*/ 18, /*cs=*/ U8X8_PIN_NONE, /*dc=*/ 17, /*reset=*/ U8X8_PIN_NONE);
//U8G2_ST7920_192X32_1_SW_SPI u8g2(U8G2_R0, /* clock=*/ 18 /* A4 */ , /* data=*/ 16 /* A2 */, /* CS=*/ 17 /* A3 */, /* reset=*/ U8X8_PIN_NONE);
//U8G2_ST7920_128X64_1_8080 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /*enable=*/ 18 /* A4 */, /*cs=*/ U8X8_PIN_NONE, /*dc/rs=*/ 17 /* A3 */, /*reset=*/ 15 /* A1 */);	// Remember to set R/W to 0 
//U8G2_ST7920_128X64_1_SW_SPI u8g2(U8G2_R0, /* clock=*/ 18 /* A4 */ , /* data=*/ 16 /* A2 */, /* CS=*/ 17 /* A3 */, /* reset=*/ U8X8_PIN_NONE);
//U8G2_ST7920_128X64_1_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* CS=*/ 10, /* reset=*/ 8);
//U8G2_ST7920_128X64_1_HW_SPI u8g2(U8G2_R0, /* CS=*/ 10, /* reset=*/ 8);
//U8G2_ST7565_EA_DOGM128_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_ST7565_EA_DOGM128_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_ST7565_EA_DOGM132_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ U8X8_PIN_NONE);	// DOGM132 Shield
//U8G2_ST7565_EA_DOGM132_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ U8X8_PIN_NONE);	// DOGM132 Shield
//U8G2_ST7565_ZOLEN_128X64_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_ST7565_ZOLEN_128X64_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_ST7565_LM6059_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);		// Adafruit ST7565 GLCD
//U8G2_ST7565_LM6059_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);			// Adafruit ST7565 GLCD
//U8G2_ST7565_NHD_C12832_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_ST7565_NHD_C12832_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_ST7567_PI_132X64_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 7, /* dc=*/ 9, /* reset=*/ 8);  // Pax Instruments Shield, LCD_BL=6
//U8G2_ST7567_PI_132X64_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 7, /* dc=*/ 9, /* reset=*/ 8);  // Pax Instruments Shield, LCD_BL=6
//U8G2_NT7534_TG12864R_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);  
//U8G2_NT7534_TG12864R_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);  
//U8G2_ST7588_JLX12864_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ 5);  
//U8G2_ST7588_JLX12864_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ 5);
//U8G2_IST3020_ERC19264_1_6800 u8g2(U8G2_R0, 44, 43, 42, 41, 40, 39, 38, 37,  /*enable=*/ 28, /*cs=*/ 32, /*dc=*/ 30, /*reset=*/ 31); // Connect WR pin with GND
//U8G2_IST3020_ERC19264_1_8080 u8g2(U8G2_R0, 44, 43, 42, 41, 40, 39, 38, 37,  /*enable=*/ 29, /*cs=*/ 32, /*dc=*/ 30, /*reset=*/ 31); // Connect RD pin with 3.3V
//U8G2_IST3020_ERC19264_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);
//U8G2_LC7981_160X80_1_6800 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /*enable=*/ 18, /*cs=*/ 14, /*dc=*/ 15, /*reset=*/ 16); // Connect RW with GND
//U8G2_T6963_240X128_1_8080 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /*enable=*/ 17, /*cs=*/ 14, /*dc=*/ 15, /*reset=*/ 16); // Connect RD with +5V, FS0 and FS1 with GND
//U8G2_T6963_256X64_1_8080 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /*enable=*/ 17, /*cs=*/ 14, /*dc=*/ 15, /*reset=*/ 16); // Connect RD with +5V, FS0 and FS1 with GND
//U8G2_SED1330_240X128_1_8080 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /*enable=*/ 17, /*cs=*/ 14, /*dc=*/ 15, /*reset=*/ 16); // Connect /RD = E with +5V, enable is /WR = RW, FG with GND, 14=Uno Pin A0
//U8G2_SED1330_240X128_1_6800 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7,  /*enable=*/ 17, /*cs=*/ 14, /*dc=*/ 15, /*reset=*/ 16); // A0 is dc pin, /WR = RW = GND, enable is /RD = E
//U8G2_RA8835_NHD_240X128_1_8080 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /*enable=*/ 17, /*cs=*/ 14, /*dc=*/ 15, /*reset=*/ 16); // Connect /RD = E with +5V, enable is /WR = RW, FG with GND, 14=Uno Pin A0
//U8G2_RA8835_NHD_240X128_1_6800 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7,  /*enable=*/ 17, /*cs=*/ 14, /*dc=*/ 15, /*reset=*/ 16); // A0 is dc pin, /WR = RW = GND, enable is /RD = E
//U8G2_UC1604_JLX19264_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8); 
//U8G2_UC1604_JLX19264_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);  
//U8G2_UC1608_ERC24064_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);  // SW SPI, Due ERC24064-1 Test Setup
//U8G2_UC1608_240X128_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);  // SW SPI, Due ERC24064-1 Test Setup
//U8G2_UC1610_EA_DOGXL160_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/  U8X8_PIN_NONE);
//U8G2_UC1610_EA_DOGXL160_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/  U8X8_PIN_NONE);
//U8G2_UC1611_EA_DOGM240_1_2ND_HW_I2C u8g2(U8G2_R0, /* reset=*/ 8);	// Due, 2nd I2C, DOGM240 Test Board
//U8G2_UC1611_EA_DOGM240_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);   // SW SPI, Due DOGXL240 Test Board
//U8G2_UC1611_EA_DOGXL240_1_2ND_HW_I2C u8g2(U8G2_R0, /* reset=*/ 8);	// Due, 2nd I2C, DOGXL240 Test Board
//U8G2_UC1611_EA_DOGXL240_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);   // SW SPI, Due DOGXL240 Test Board
//U8G2_SSD1606_172X72_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);		// eInk/ePaper Display
//U8G2_SSD1607_200X200_1_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);	// eInk/ePaper Display

// End of constructor list

uint8_t background_images[8][32];

void setup(void) {
  uint8_t i;
  /* U8g2 Project: SSD1306 Test Board */
  //pinMode(10, OUTPUT);
  //pinMode(9, OUTPUT);
  //digitalWrite(10, 0);
  //digitalWrite(9, 0);		

  /* U8g2 Project: T6963 Test Board */
  //pinMode(18, OUTPUT);
  //digitalWrite(18, 1);


  u8g2.begin();
  u8g2.setFlipMode(0);

  u8g2.setFont(u8g2_font_chroma48medium8_8r);
  u8g2.setFontPosBottom();
  
  // create eight images for a background animation
  for( i = 0; i < 8; i++ ) {
    // setup buffer by starting with the first page
    u8g2.firstPage();
    // render some graphics into the buffer
    u8g2.drawStr(0-i,8,"U8g2U");
    // store four tiles from the start of the buffer content in some local memory
    // one tile has 8x8 pixel: 8 bytes, four tiles are 32 bytes.
    // note: the actual memory pattern depends on the target display
    memcpy(background_images[i], u8g2.getBufferPtr(), 32);    
  }

  // revert back to basline pos
  u8g2.setFontPosBaseline();

}

void drawBackground(uint8_t image_idx)
{
  u8g2_uint_t src_idx, dest_idx, total;
  uint8_t *buf;
  
  total = u8g2.getBufferTileWidth();
  total *= 8;	// calculate width in pixel
  
  // get the pointer to the buffer. We will write the image to that buffer
  buf = u8g2.getBufferPtr();
  
  // fill the buffer with the background image
  // repeat the image until the complete width is filled
  src_idx = 0;
  for( dest_idx = 0; dest_idx < total; dest_idx++ )
  {
    buf[dest_idx] = background_images[image_idx][src_idx];
    src_idx++;
    if ( src_idx >= 32 )
      src_idx = 0;
  }
}

void drawLogo(void)
{
    u8g2.setFontMode(1);	// Transparent

    u8g2.setFontDirection(0);
    u8g2.setFont(u8g2_font_inb24_mf);
    u8g2.drawStr(0, 30, "U");
    
    u8g2.setFontDirection(1);
    u8g2.setFont(u8g2_font_inb30_mn);
    u8g2.drawStr(21,8,"8");
        
    u8g2.setFontDirection(0);
    u8g2.setFont(u8g2_font_inb24_mf);
    u8g2.drawStr(51,30,"g");
    u8g2.drawStr(67,30,"\xb2");
    
    u8g2.drawHLine(2, 35, 47);
    u8g2.drawHLine(3, 36, 47);
    u8g2.drawVLine(45, 32, 12);
    u8g2.drawVLine(46, 33, 12);
    
}

uint8_t image_idx = 0;
uint8_t dir = 0;

void loop(void) {

  // buffer clear is not required any more 
  // this increase performance a little bit
  u8g2.setAutoPageClear(0);	

  // draw the U8g2 logo with a custom background
  u8g2.firstPage();
  do {
    drawBackground(image_idx);
    drawLogo();
  } while ( u8g2.nextPage() );
  
  // move the background around
  if ( dir == 0 ){
    image_idx++;
    if ( image_idx == 7 ) {
      dir = 1;
    }
  } else {
    image_idx--;
    if ( image_idx == 0 ) {
      dir = 0;
    }
  }    
  
  delay(10);
}