U8g2 is a graphics library developed at [olikraus/u8g2](https://github.com/olikraus/u8g2) with support for many different displays. It is the successor of [U8glib](https://github.com/olikraus/u8glib) which is not developed any further.
U8g2 is a graphics library developed at [olikraus/u8g2](https://github.com/olikraus/u8g2) with support for many different displays. It is the successor of [U8glib](https://github.com/olikraus/u8glib) which is not developed any further. Please see [How to port U8g code](https://github.com/olikraus/u8g2/wiki/u8gvsu8g2) for generic porting instructions.
- st7567 - variants 132x64, jlx12864, and enh_dg128064i
- st75256 jlx172104 and jlx256128 variants
- st7586 - s028hn118a and erc240160 variants
- st75256 - jlx172104 and jlx256128 variants
- t6963 - variants 240x128, 240x64, 256x64, 128x64, and 160x80
- uc1701 - dogs102 and mini12864 variants
- uc1701 - dogs102 and mini12864 variants
This integration is based on [v2.19.8](https://github.com/olikraus/U8g2_Arduino/releases/tag/2.19.8).
This integration uses full "RAM" memory buffer without picture loop and calls u8g2's `begin()` internally when creating a display object. It is based on [v2.23.18](https://github.com/olikraus/U8g2_Arduino/releases/tag/2.23.18).
## Overview
## Overview
### I²C Connection
Hook up SDA and SCL to any free GPIOs. Eg. [graphics_test.lua](../../../lua_examples/u8glib/u8g_graphics_test.lua) expects SDA=GPIO16 and SCL=GPIO17. They are used to set up nodemcu's I²C driver before accessing the display:
```lua
id=i2c.HW0
sda=16
scl=17
i2c.setup(id,sda,scl,i2c.FAST)
```
### SPI connection
Hook up pins to any free GPIOs:
- SCLK
- MOSI
- CS
- D/C
- RES (optional for some displays)
Again, refer to the initialization sequence eg. in [graphics_test.lua](../../../lua_examples/u8glib/u8g_graphics_test.lua):
```lua
sclk=19
mosi=23
bus=spi.master(spi.HSPI,{sclk=sclk,mosi=mosi})
```
### Library Usage
### Library Usage
The Lua bindings for this library closely follow u8g2's object oriented C++ API. Based on the u8g2 class, you create an object for your display type.
The Lua bindings for this library closely follow u8g2's object oriented C++ API. Based on the u8g2 class, you create an object for your display type. The communication interface has to be initialized up front, refer to the examples below on how to do this.
SSD1306 via I²C:
SSD1306 via I²C:
```lua
```lua
...
@@ -84,21 +102,58 @@ res = 0 -- RES is optional YMMV
...
@@ -84,21 +102,58 @@ res = 0 -- RES is optional YMMV
disp=u8g2.ssd1306_128x64_noname(bus,cs,dc,res)
disp=u8g2.ssd1306_128x64_noname(bus,cs,dc,res)
```
```
This object provides all of u8g2's methods to control the display. Refer to [graphics_test.lua](../../../lua_examples/u8glib/u8g_graphics_test.lua) to get an impression how this is achieved with Lua code. Visit the [u8g2 homepage](https://github.com/olikraus/u8g2) for technical details.
This object provides all of u8g2's methods to control the display. Refer to [graphics_test.lua](../../../lua_examples/u8g2/graphics_test.lua) to get an impression how this is achieved with Lua code. Visit the [u8g2 homepage](https://github.com/olikraus/u8g2) for technical details.
### Displays selection
I²C and HW SPI based displays with support in u8g2 can be enabled.
The procedure is different for ESP8266 and ESP32 platforms.
#### ESP8266
Add the desired entries to the I²C or SPI display tables in [app/include/u8g2_displays.h](../../../app/include/u8g2_displays.h):
I²C and HW SPI based displays with support in u8g2 can be enabled. To get access to the respective constructors, enable the desired entries for I²C and SPI displays in u8g2's sub-menu (run `make menuconfig`).
Alternatively, you can define them as `U8G2_DISPLAY_TABLE_I2C_EXTRA` and `U8G2_DISPLAY_TABLE_SPI_EXTRA` in an external file to avoid changing the source tree. Include the extra file on the `make` command line:
```
make EXTRA_CCFLAGS='-include $(TOP_DIR)/my_extras.h'
```
### Fonts
#### ESP32
u8g2 comes with a wide range of fonts for small displays. They can be supplied as strings or compiled into the firmware image to decrease the RAM footprint. Simply add the desired fonts to the font selection sub-entry via`make menuconfig`.
Enable the desired entries for I²C and SPI displays in u8g2's sub-menu (run`make menuconfig`).
They'll become available as `u8g2.<font_name>` in Lua.
### Fonts selection
U8g2 comes with a wide range of fonts for small displays. Fonts can be supplied as strings or compiled into the firmware image to decrease the RAM footprint. If compiled into the firmware they become available as `u8g2.<font_name>` in Lua.
The procedure is different for ESP8266 and ESP32 platforms.
#### ESP8266
Add the desired fonts to the font table in [app/include/u8g2_fonts.h](../../../app/include/u8g2_fonts.h):
```c
#define U8G2_FONT_TABLE \
U8G2_FONT_TABLE_ENTRY(font_6x10_tf) \
U8G2_FONT_TABLE_ENTRY(font_unifont_t_symbols) \
```
Alternatively, you can define this as `U8G2_FONT_TABLE_EXTRA` in an external file to avoid changing the source tree. Include the extra file on the `make` command line:
```
make EXTRA_CCFLAGS='-include $(TOP_DIR)/my_extras.h'
```
#### ESP32
Add the desired fonts to the font selection sub-entry via `make menuconfig`.
### Bitmaps
### Bitmaps
XBM bitmaps are supplied as strings to `drawXBM()`. This off-loads all data handling from the u8g2 module to generic methods for binary files. See [graphics_test.lua](../../../lua_examples/u8glib/u8g_graphics_test.lua).
XBM bitmaps are supplied as strings to `drawXBM()` in contrast to the source code based inclusion of XBMs in upstream u8g2 library. This off-loads all data handling from the u8g2 module to generic methods for binary files. See [graphics_test.lua](../../../lua_examples/u8g2/graphics_test.lua).
In contrast to the source code based inclusion of XBMs in upstream u8g2 library, it's required to provide precompiled binary files. This can be performed online with [Online-Utility's Image Converter](http://www.online-utility.org/image_converter.jsp): Convert from XBM to MONO format and upload the binary result.
Conversion of XBM bitmaps can be performed online with [Online-Utility's Image Converter](http://www.online-utility.org/image_converter.jsp): Convert from XBM to MONO format and upload the binary result.
## I²C Display Drivers
## I²C Display Drivers
Initialize a display via I²C.
Initialize a display via I²C.
...
@@ -106,17 +161,31 @@ Initialize a display via I²C.
...
@@ -106,17 +161,31 @@ Initialize a display via I²C.
-`u8g2.ld7032_i2c_60x32()`
-`u8g2.ld7032_i2c_60x32()`
-`u8g2.sh1106_i2c_128x64_noname()`
-`u8g2.sh1106_i2c_128x64_noname()`
-`u8g2.sh1106_i2c_128x64_vcomh0()`
-`u8g2.sh1106_i2c_128x64_vcomh0()`
-`u8g2.sh1107_i2c_64x128()`
-`u8g2.sh1107_i2c_seeed_96x96()`
-`u8g2.sh1107_i2c_128x128()`
-`u8g2.sh1108_i2c_160x160()`
-`u8g2.ssd1305_i2c_128x32_noname()`
-`u8g2.ssd1305_i2c_128x32_noname()`
-`u8g2.ssd1306_i2c_128x32_univision()`
-`u8g2.ssd1306_i2c_128x32_univision()`
-`u8g2.ssd1306_i2c_128x64_noname()`
-`u8g2.ssd1306_i2c_128x64_noname()`
-`u8g2.ssd1306_i2c_128x64_vcomh0()`
-`u8g2.ssd1306_i2c_128x64_vcomh0()`
-`u8g2.ssd1309_i2c_128x64_noname0()`
-`u8g2.ssd1309_i2c_128x64_noname0()`
-`u8g2.ssd1309_i2c_128x64_noname2()`
-`u8g2.ssd1309_i2c_128x64_noname2()`
-`u8g2.ssd1306_i2c_128x64_alt0()`
-`u8g2.ssd1306_i2c_64x48_er()`
-`u8g2.ssd1306_i2c_64x48_er()`
-`u8g2.ssd1306_i2c_96x16_er()`
-`u8g2.ssd1306_i2c_96x16_er()`
-`u8g2.ssd1325_i2c_nhd_128x64()`
-`u8g2.ssd1325_i2c_nhd_128x64()`
-`u8g2.ssd1326_i2c_er_256x32()`
-`u8g2.ssd1327_i2c_seeed_96x96()`
-`u8g2.ssd1327_i2c_seeed_96x96()`
-`u8g2.ssd1327_i2c_ea_w128128()`
-`u8g2.ssd1327_i2c_midas_128x128()`
-`u8g2.st7567_i2c_64x32()`
-`u8g2.st7588_i2c_jlx12864()`
-`u8g2.st7588_i2c_jlx12864()`
-`u8g2.st75256_i2c_jlx25664()`
-`u8g2.st75256_i2c_jlx172104()`
-`u8g2.st75256_i2c_jlx240160()`
-`u8g2.st75256_i2c_jlx256128()`
-`u8g2.st75256_i2c_jlx256160()`
-`u8g2.uc1602_i2c_128X32()`
-`u8g2.uc1602_i2c_128X32()`
-`u8g2.uc1604_i2c_jlx19264()`
-`u8g2.uc1604_i2c_jlx19264()`
-`u8g2.uc1608_i2c_erc24064()`
-`u8g2.uc1608_i2c_erc24064()`
...
@@ -137,7 +206,17 @@ Initialize a display via I²C.
...
@@ -137,7 +206,17 @@ Initialize a display via I²C.
See [u8g2 clearBuffer()](https://github.com/olikraus/u8g2/wiki/u8g2reference#clearbuffer).
## u8g2.disp:drawBox()
Draw a box (filled frame).
See [u8g2 drawBox()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawbox).
## u8g2.disp:drawCircle()
Draw a circle.
See [u8g2 drawCircle()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawcircle).
Note that parameter `opt` is optional and defaults to `u8g2.DRAW_ALL` if omitted.
## u8g2.disp:drawDisc()
Draw a filled circle.
See [u8g2 drawDisc()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawdisc).
Note that parameter `opt` is optional and defaults to `u8g2.DRAW_ALL` if omitted.
## u8g2.disp:drawEllipse()
Draw an ellipse.
See [u8g2 drawEllipse()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawellipse).
Note that parameter `opt` is optional and defaults to `u8g2.DRAW_ALL` if omitted.
## u8g2.disp:drawFilledEllipse()
Draw a filled ellipse.
See [u8g2 drawFilledEllipse()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawfilledellipse).
Note that parameter `opt` is optional and defaults to `u8g2.DRAW_ALL` if omitted.
## u8g2.disp:drawFrame()
Draw a frame (empty box).
See [u8g2 drawFrame()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawframe).
## u8g2.disp:drawGlyph()
Draw a single character.
See [u8g2 drawGlyph()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawglyph).
## u8g2.disp:drawHLine()
Draw a horizontal line.
See [u8g2 drawHLine()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawhline).
## u8g2.disp:drawLine()
Draw a line between two points.
See [u8g2 drawLine()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawline).
## u8g2.disp:drawPixel()
Draw a pixel.
See [u8g2 drawPixel()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawpixel).
## u8g2.disp:drawRBox()
Draw a box with round edges.
See [u8g2 drawRBox()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawrbox).
## u8g2.disp:drawRFrame()
Draw a frame with round edges.
See [u8g2 drawRFrame()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawrframe).
## u8g2.disp:drawStr()
Draw a string.
See [u8g2 drawStr()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawstr).
## u8g2.disp:drawTriangle()
Draw a triangle (filled polygon).
See [u8g2 drawTriangle()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawtriangle).
## u8g2.disp:drawUTF8()
Draw a string which is encoded as UTF-8.
See [u8g2 drawUTF8()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawutf8).
## u8g2.disp:drawVLine()
Draw a vertical line.
See [u8g2 drawVLine()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawvline).
## u8g2.disp:drawXBM()
Draw a XBM Bitmap.
See [u8g2 drawXBM()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawxbm).
XBM bitmaps are supplied as strings to `drawXBM()`. This off-loads all data handling from the u8g2 module to generic methods for binary files. See [graphics_test.lua](../../../lua_examples/u8glib/u8g_graphics_test.lua).
In contrast to the source code based inclusion of XBMs in upstream u8g2 library, it's required to provide precompiled binary files. This can be performed online with [Online-Utility's Image Converter](http://www.online-utility.org/image_converter.jsp): Convert from XBM to MONO format and upload the binary result.
## u8g2.disp:getAscent()
Returns the reference height of the glyphs above the baseline (ascent).
See [u8g2 getAscent()](https://github.com/olikraus/u8g2/wiki/u8g2reference#getascent).
## u8g2.disp:getDescent()
Returns the reference height of the glyphs below the baseline (descent).
See [u8g2 getDescent()](https://github.com/olikraus/u8g2/wiki/u8g2reference#getdescent).
## u8g2.disp:getStrWidth()
Return the pixel width of string.
See [u8g2 getStrWidth()](https://github.com/olikraus/u8g2/wiki/u8g2reference#getstrwidth).
## u8g2.disp:getUTF8Width()
Return the pixel width of an UTF-8 encoded string.
See [u8g2 getUTF8Width()](https://github.com/olikraus/u8g2/wiki/u8g2reference#getutf8width).
## u8g2.disp:sendBuffer()
Send the content of the memory frame buffer to the display.
See [u8g2 sendBuffer()](https://github.com/olikraus/u8g2/wiki/u8g2reference#sendbuffer).
## u8g2.disp:setBitmapMode()
Define bitmap background color mode.
See [u8g2 setBitmapMode()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setbitmapmode).
## u8g2.disp:setContrast()
Set the contrast or brightness.
See [u8g2 setContrast()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setconstrast).
## u8g2.disp:setDisplayRotation()
Changes the display rotation.
See [u8g2 setDisplayRotation()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setdisplayrotation).
## u8g2.disp:setDrawColor()
Defines the bit value (color index) for all drawing functions.
See [u8g2 setDrawColor()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setdrawcolor).
## u8g2.disp:setFlipMode()
Set flip (180 degree rotation) mode.
See [u8g2 setFlipMode()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setflipmode).
## u8g2.disp:setFont()
Define a u8g2 font for the glyph and string drawing functions. They can be supplied as strings or compiled into the firmware image. They are available as `u8g2.<font_name>` in Lua.
See [u8g2 setFont()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfont).
## u8g2.disp:setFontDirection()
Set the drawing direction of all strings or glyphs.
See [u8g2 setFontDirection()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontdirection).
## u8g2.disp:setFontMode()
Define font background color mode.
See [u8g2 setFontMode()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontmode).
## u8g2.disp:setFontPosBaseline()
Change the reference position for the glyph and string draw functions to "baseline".
See [u8g2 setFontPosBaseline()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontposbaseline).
## u8g2.disp:setFontPosBottom()
Change the reference position for the glyph and string draw functions to "bottom".
See [u8g2 setFontPosBottom()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontposbottom).
## u8g2.disp:setFontPosTop()
Change the reference position for the glyph and string draw functions to "top".
See [u8g2 setFontPosTop()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontpostop).
## u8g2.disp:setFontPosCenter()
Change the reference position for the glyph and string draw functions to "center".
See [u8g2 setFontPosCenter()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontposcenter).
## u8g2.disp:setFontRefHeightAll()
Set ascent and descent calculation mode to "highest and lowest glyph".
See [u8g2 setFontRefHeightAll()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontrefheightall).
## u8g2.disp:setFontRefHeightExtendedText()
Set ascent and descent calculation mode to "highest of [A1(], lowest of [g(]".
See [u8g2 setFontRefHeightExtendedText()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontrefheightextendedtext).
## u8g2.disp:setFontRefHeightText()
Set ascent and descent calculation mode to "highest of [A1], lowest of [g]".
See [u8g2 setFontRefHeightText()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontrefheighttext).
## u8g2.disp:setPowerSave()
Activate or disable power save mode of the display.
See [u8g2 setPowerSave()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setpowersave).
See [u8g2 clearBuffer()](https://github.com/olikraus/u8g2/wiki/u8g2reference#clearbuffer).
## u8g2.disp:drawBox()
Draw a box (filled frame).
See [u8g2 drawBox()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawbox).
## u8g2.disp:drawCircle()
Draw a circle.
See [u8g2 drawCircle()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawcircle).
Note that parameter `opt` is optional and defaults to `u8g2.DRAW_ALL` if omitted.
## u8g2.disp:drawDisc()
Draw a filled circle.
See [u8g2 drawDisc()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawdisc).
Note that parameter `opt` is optional and defaults to `u8g2.DRAW_ALL` if omitted.
## u8g2.disp:drawEllipse()
Draw an ellipse.
See [u8g2 drawEllipse()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawellipse).
Note that parameter `opt` is optional and defaults to `u8g2.DRAW_ALL` if omitted.
## u8g2.disp:drawFilledEllipse()
Draw a filled ellipse.
See [u8g2 drawFilledEllipse()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawfilledellipse).
Note that parameter `opt` is optional and defaults to `u8g2.DRAW_ALL` if omitted.
## u8g2.disp:drawFrame()
Draw a frame (empty box).
See [u8g2 drawFrame()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawframe).
## u8g2.disp:drawGlyph()
Draw a single character.
See [u8g2 drawGlyph()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawglyph).
## u8g2.disp:drawHLine()
Draw a horizontal line.
See [u8g2 drawHLine()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawhline).
## u8g2.disp:drawLine()
Draw a line between two points.
See [u8g2 drawLine()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawline).
## u8g2.disp:drawPixel()
Draw a pixel.
See [u8g2 drawPixel()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawpixel).
## u8g2.disp:drawRBox()
Draw a box with round edges.
See [u8g2 drawRBox()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawrbox).
## u8g2.disp:drawRFrame()
Draw a frame with round edges.
See [u8g2 drawRFrame()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawrframe).
## u8g2.disp:drawStr()
Draw a string.
See [u8g2 drawStr()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawstr).
## u8g2.disp:drawTriangle()
Draw a triangle (filled polygon).
See [u8g2 drawTriangle()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawtriangle).
## u8g2.disp:drawUTF8()
Draw a string which is encoded as UTF-8.
See [u8g2 drawUTF8()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawutf8).
## u8g2.disp:drawVLine()
Draw a vertical line.
See [u8g2 drawVLine()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawvline).
## u8g2.disp:drawXBM()
Draw a XBM Bitmap.
See [u8g2 drawXBM()](https://github.com/olikraus/u8g2/wiki/u8g2reference#drawxbm).
XBM bitmaps are supplied as strings to `drawXBM()`. This off-loads all data handling from the u8g2 module to generic methods for binary files. See [graphics_test.lua](../../../lua_examples/u8glib/u8g_graphics_test.lua).
In contrast to the source code based inclusion of XBMs in upstream u8g2 library, it's required to provide precompiled binary files. This can be performed online with [Online-Utility's Image Converter](http://www.online-utility.org/image_converter.jsp): Convert from XBM to MONO format and upload the binary result.
## u8g2.disp:getAscent()
Returns the reference height of the glyphs above the baseline (ascent).
See [u8g2 getAscent()](https://github.com/olikraus/u8g2/wiki/u8g2reference#getascent).
## u8g2.disp:getDescent()
Returns the reference height of the glyphs below the baseline (descent).
See [u8g2 getDescent()](https://github.com/olikraus/u8g2/wiki/u8g2reference#getdescent).
## u8g2.disp:getStrWidth()
Return the pixel width of string.
See [u8g2 getStrWidth()](https://github.com/olikraus/u8g2/wiki/u8g2reference#getstrwidth).
## u8g2.disp:getUTF8Width()
Return the pixel width of an UTF-8 encoded string.
See [u8g2 getUTF8Width()](https://github.com/olikraus/u8g2/wiki/u8g2reference#getutf8width).
## u8g2.disp:sendBuffer()
Send the content of the memory frame buffer to the display.
See [u8g2 sendBuffer()](https://github.com/olikraus/u8g2/wiki/u8g2reference#sendbuffer).
## u8g2.disp:setBitmapMode()
Define bitmap background color mode.
See [u8g2 setBitmapMode()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setbitmapmode).
## u8g2.disp:setContrast()
Set the contrast or brightness.
See [u8g2 setContrast()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setconstrast).
## u8g2.disp:setDisplayRotation()
Changes the display rotation.
See [u8g2 setDisplayRotation()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setdisplayrotation).
## u8g2.disp:setDrawColor()
Defines the bit value (color index) for all drawing functions.
See [u8g2 setDrawColor()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setdrawcolor).
## u8g2.disp:setFlipMode()
Set flip (180 degree rotation) mode.
See [u8g2 setFlipMode()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setflipmode).
## u8g2.disp:setFont()
Define a u8g2 font for the glyph and string drawing functions. They can be supplied as strings or compiled into the firmware image. They are available as `u8g2.<font_name>` in Lua.
See [u8g2 setFont()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfont).
## u8g2.disp:setFontDirection()
Set the drawing direction of all strings or glyphs.
See [u8g2 setFontDirection()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontdirection).
## u8g2.disp:setFontMode()
Define font background color mode.
See [u8g2 setFontMode()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontmode).
## u8g2.disp:setFontPosBaseline()
Change the reference position for the glyph and string draw functions to "baseline".
See [u8g2 setFontPosBaseline()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontposbaseline).
## u8g2.disp:setFontPosBottom()
Change the reference position for the glyph and string draw functions to "bottom".
See [u8g2 setFontPosBottom()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontposbottom).
## u8g2.disp:setFontPosTop()
Change the reference position for the glyph and string draw functions to "top".
See [u8g2 setFontPosTop()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontpostop).
## u8g2.disp:setFontPosCenter()
Change the reference position for the glyph and string draw functions to "center".
See [u8g2 setFontPosCenter()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontposcenter).
## u8g2.disp:setFontRefHeightAll()
Set ascent and descent calculation mode to "highest and lowest glyph".
See [u8g2 setFontRefHeightAll()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontrefheightall).
## u8g2.disp:setFontRefHeightExtendedText()
Set ascent and descent calculation mode to "highest of [A1(], lowest of [g(]".
See [u8g2 setFontRefHeightExtendedText()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontrefheightextendedtext).
## u8g2.disp:setFontRefHeightText()
Set ascent and descent calculation mode to "highest of [A1], lowest of [g]".
See [u8g2 setFontRefHeightText()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontrefheighttext).
## u8g2.disp:setPowerSave()
Activate or disable power save mode of the display.
See [u8g2 setPowerSave()](https://github.com/olikraus/u8g2/wiki/u8g2reference#setpowersave).