223 lines
8.5 KiB
Markdown
223 lines
8.5 KiB
Markdown
# ucg Module
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Ucglib is a graphics library developed at [olikraus/ucglib](https://github.com/olikraus/ucglib) with support for color TFT displays. The NodeMCU firmware supports a subset of these:
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- ILI9163
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- ILI9341
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- PCF8833
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- SEPS225
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- SSD1331
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- SSD1351
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- ST7735
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This integration is based on [v1.3.3](https://github.com/olikraus/Ucglib_Arduino/releases/tag/v1.3.3).
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## Overview
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### SPI Connection
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The HSPI module is used ([more information](http://d.av.id.au/blog/esp8266-hardware-spi-hspi-general-info-and-pinout/)), so certain pins are fixed:
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* HSPI CLK = GPIO14
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* HSPI MOSI = GPIO13
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* HSPI MISO = GPIO12 (not used)
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All other pins can be assigned to any available GPIO:
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* CS
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* D/C
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* RES (optional for some displays)
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Also refer to the initialization sequence eg in [GraphicsTest.lua](https://github.com/nodemcu/nodemcu-firmware/blob/master/lua_examples/ucglib/GraphicsRest.lua):
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```lua
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spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, 8, 8)
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```
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### Library Usage
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The Lua bindings for this library closely follow ucglib's object oriented C++ API. Based on the ucg class, you create an object for your display type.
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ILI9341 via SPI:
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```lua
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cs = 8 -- GPIO15, pull-down 10k to GND
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dc = 4 -- GPIO2
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res = 0 -- GPIO16, RES is optional YMMV
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disp = ucg.ili9341_18x240x320_hw_spi(cs, dc, res)
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```
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This object provides all of ucglib's methods to control the display.
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Again, refer to [GraphicsTest.lua](https://github.com/nodemcu/nodemcu-firmware/blob/master/lua_examples/ucglib/GraphicsTest.lua) to get an impression how this is achieved with Lua code. Visit the [ucglib homepage](https://github.com/olikraus/ucglib) for technical details.
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### Displays
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To get access to the display constructors, add the desired entries to the display table in [app/include/ucg_config.h](https://github.com/nodemcu/nodemcu-firmware/blob/master/app/include/ucg_config.h):
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```c
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#define UCG_DISPLAY_TABLE \
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UCG_DISPLAY_TABLE_ENTRY(ili9341_18x240x320_hw_spi, ucg_dev_ili9341_18x240x320, ucg_ext_ili9341_18) \
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UCG_DISPLAY_TABLE_ENTRY(st7735_18x128x160_hw_spi, ucg_dev_st7735_18x128x160, ucg_ext_st7735_18) \
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```
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### Fonts
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ucglib comes with a wide range of fonts for small displays. Since they need to be compiled into the firmware image, you'd need to include them in [app/include/ucg_config.h](https://github.com/nodemcu/nodemcu-firmware/blob/master/app/include/ucg_config.h) and recompile. Simply add the desired fonts to the font table:
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```c
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#define UCG_FONT_TABLE \
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UCG_FONT_TABLE_ENTRY(font_7x13B_tr) \
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UCG_FONT_TABLE_ENTRY(font_helvB12_hr) \
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UCG_FONT_TABLE_ENTRY(font_helvB18_hr) \
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UCG_FONT_TABLE_ENTRY(font_ncenR12_tr) \
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UCG_FONT_TABLE_ENTRY(font_ncenR14_hr)
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```
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They'll be available as `ucg.<font_name>` in Lua.
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## Display Drivers
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Initialize a display via Hardware SPI.
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- `ili9163_18x128x128_hw_spi()`
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- `ili9341_18x240x320_hw_spi()`
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- `pcf8833_16x132x132_hw_spi()`
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- `seps225_16x128x128_univision_hw_spi()`
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- `ssd1351_18x128x128_hw_spi()`
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- `ssd1351_18x128x128_ft_hw_spi()`
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- `ssd1331_18x96x64_univision_hw_spi()`
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- `st7735_18x128x160_hw_spi()`
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#### Syntax
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`ucg.st7735_18x128x160_hw_spi(cs, dc, [res])`
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#### Parameters
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- `cs` GPIO pin for /CS
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- `dc` GPIO pin for DC
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- `res` GPIO pin for /RES (optional)
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#### Returns
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ucg display object
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#### Example
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```lua
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spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
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cs = 8 -- GPIO15, pull-down 10k to GND
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dc = 4 -- GPIO2
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res = 0 -- GPIO16, RES is optional YMMV
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disp = ucg.st7735_18x128x160_hw_spi(cs, dc, res)
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```
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## Constants
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`ucg.FONT_MODE_TRANSPARENT`, `ucg.FONT_MODE_SOLID`, `ucg.DRAW_UPPER_RIGHT`,
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`ucg.DRAW_UPPER_LEFT`, `ucg.DRAW_LOWER_RIGHT`, `ucg.DRAW_LOWER_LEFT`, `ucg.DRAW_ALL`
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`ucg.font_7x13B_tr`, ...
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# ucg.disp Sub-Module
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## [ucg.disp:begin()](https://github.com/olikraus/ucglib/wiki/reference#begin)
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## [ucg.disp:clearScreen()](https://github.com/olikraus/ucglib/wiki/reference#clearscreen)
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## [ucg.disp:draw90Line()](https://github.com/olikraus/ucglib/wiki/reference#draw90line)
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## [ucg.disp:drawBox()](https://github.com/olikraus/ucglib/wiki/reference#drawbox)
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## [ucg.disp:drawCircle()](https://github.com/olikraus/ucglib/wiki/reference#drawcircle)
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## [ucg.disp:drawDisc()](https://github.com/olikraus/ucglib/wiki/reference#drawdisc)
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## [ucg.disp:drawFrame()](https://github.com/olikraus/ucglib/wiki/reference#drawframe)
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## [ucg.disp:drawGlyph()](https://github.com/olikraus/ucglib/wiki/reference#drawglyph)
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## [ucg.disp:drawGradientBox()](https://github.com/olikraus/ucglib/wiki/reference#drawgradientbox)
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## [ucg.disp:drawGradientLine()](https://github.com/olikraus/ucglib/wiki/reference#drawgradientline)
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## [ucg.disp:drawHLine()](https://github.com/olikraus/ucglib/wiki/reference#drawhline)
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## [ucg.disp:drawLine()](https://github.com/olikraus/ucglib/wiki/reference#drawline)
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## [ucg.disp:drawPixel()](https://github.com/olikraus/ucglib/wiki/reference#drawpixel)
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## [ucg.disp:drawRBox()](https://github.com/olikraus/ucglib/wiki/reference#drawrbox)
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## [ucg.disp:drawRFrame()](https://github.com/olikraus/ucglib/wiki/reference#drawrframe)
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## [ucg.disp:drawString()](https://github.com/olikraus/ucglib/wiki/reference#drawstring)
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## [ucg.disp:drawTetragon()](https://github.com/olikraus/ucglib/wiki/reference#drawtetragon)
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## [ucg.disp:drawTriangle()](https://github.com/olikraus/ucglib/wiki/reference#drawrtiangle)
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## [ucg.disp:drawVLine()](https://github.com/olikraus/ucglib/wiki/reference#drawvline)
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## [ucg.disp:getFontAscent()](https://github.com/olikraus/ucglib/wiki/reference#getfontascent)
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## [ucg.disp:getFontDescent()](https://github.com/olikraus/ucglib/wiki/reference#getfontdescent)
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## [ucg.disp:getHeight()](https://github.com/olikraus/ucglib/wiki/reference#getheight)
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## [ucg.disp:getStrWidth()](https://github.com/olikraus/ucglib/wiki/reference#getstrwidth)
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## [ucg.disp:getWidth()](https://github.com/olikraus/ucglib/wiki/reference#getwidth)
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## [ucg.disp:print()](https://github.com/olikraus/ucglib/wiki/reference#print)
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## [ucg.disp:setClipRange()](https://github.com/olikraus/ucglib/wiki/reference#setcliprange)
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## [ucg.disp:setColor()](https://github.com/olikraus/ucglib/wiki/reference#setcolor)
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## ucg.disp:setFont()
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ucglib comes with a wide range of fonts for small displays. Since they need to be compiled into the firmware image, you'd need to include them in [app/include/ucg_config.h](https://github.com/nodemcu/nodemcu-firmware/blob/master/app/include/ucg_config.h) and recompile. Simply add the desired fonts to the font table:
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```c
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#define UCG_FONT_TABLE \
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UCG_FONT_TABLE_ENTRY(font_7x13B_tr) \
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UCG_FONT_TABLE_ENTRY(font_helvB12_hr) \
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UCG_FONT_TABLE_ENTRY(font_helvB18_hr) \
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UCG_FONT_TABLE_ENTRY(font_ncenR12_tr) \
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UCG_FONT_TABLE_ENTRY(font_ncenR14_hr)
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```
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They'll be available as `ucg.<font_name>` in Lua.
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#### Syntax
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`disp:setFont(font)`
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#### Parameters
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`font` constant to identify pre-compiled font
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#### Returns
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`nil`
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#### Example
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```lua
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disp:setFont(ucg.font_7x13B_tr)
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```
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#### See also
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[ucglib setFont()](https://github.com/olikraus/ucglib/wiki/reference#setfont)
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## [ucg.disp:setFontMode()](https://github.com/olikraus/ucglib/wiki/reference#setfontmode)
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## [ucg.disp:setFontPosBaseline()](https://github.com/olikraus/ucglib/wiki/reference#setfontposbaseline)
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## [ucg.disp:setFontPosBottom()](https://github.com/olikraus/ucglib/wiki/reference#setfontposbottom)
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## [ucg.disp:setFontPosCenter()](https://github.com/olikraus/ucglib/wiki/reference#setfontposcenter)
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## [ucg.disp:setFontPosTop()](https://github.com/olikraus/ucglib/wiki/reference#setfontpostop)
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## [ucg.disp:setMaxClipRange()](https://github.com/olikraus/ucglib/wiki/reference#setmaxcliprange)
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## [ucg.disp:setPrintDir()](https://github.com/olikraus/ucglib/wiki/reference#setprintdir)
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## [ucg.disp:setPrintPos()](https://github.com/olikraus/ucglib/wiki/reference#setprintpos)
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## [ucg.disp:setRotate90()](https://github.com/olikraus/ucglib/wiki/reference#setrotate90)
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## [ucg.disp:setRotate180()](https://github.com/olikraus/ucglib/wiki/reference#setrotate180)
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## [ucg.disp:setRotate270()](https://github.com/olikraus/ucglib/wiki/reference#setrotate270)
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## [ucg.disp:setScale2x2()](https://github.com/olikraus/ucglib/wiki/reference#setscale2x2)
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## [ucg.disp:undoClipRange()](https://github.com/olikraus/ucglib/wiki/reference#undocliprange)
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## [ucg.disp:undoRotate()](https://github.com/olikraus/ucglib/wiki/reference#undorotate)
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## [ucg.disp:undoScale()](https://github.com/olikraus/ucglib/wiki/reference#undoscale)
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