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111 lines
4.1 KiB
Plaintext
111 lines
4.1 KiB
Plaintext
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U8glib V2: Name and project goals
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https://github.com/olikraus/u8g2
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U8g2 = Universal 8bit Graphics
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[U]niversal: Support for many displays ans development platforms
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[8]bit: Initial focus had been 8 bit microcontroller systems
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[g]raphics": U8g2 is a graphics library with focus on monochrome graphics displays
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[2]: Second generation and successor of u8glib
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U8glib V2 Goals
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- Support for monochrome LCDs and OLEDs
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- Focus on "monochrome"
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- Low memory footprint
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U8glib V2: Features and Limitations
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- Full Memory Buffer
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- 3-wire-SPI
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- Support for Arduino Libraries SPI and TWI
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- Unicode Support
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Unicode plane 0 (Basic Multilingual Plane, BMP, glyphs with 0x0000-0xffff)
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is fully supported.
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Limitation: Unicode planes > 0 are not supported
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- UTF-8 Support
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2 and 3 byte sequences are detected and handled.
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Limitation:
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Behavior for sequences with more than 3 bytes is unknown.
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- Large number of fonts
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- Compilation speed improved (font data)
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- "Text only" sub library: U8x8
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- Hardware supported display flip
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- Better hardware support: Tested with avr, esp8266 and sam architectures.
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u8g vs. u8g2
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Major Changes (Code rework required)
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- The name of the include file has changed: Use
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#include "U8g2lib.h"
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- The native type for pixel coordinates has changed to u8g2_uint_t
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Use the following line to redefine this at the beginning of your code
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typedef u8g2_uint_t u8g_uint_t;
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- Old Arduino IDE 00xx (before 1.00) is not supported any more.
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ARDUINO macro must be >= 100
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- begin() must be called (this was optional in U8glib)
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- constructor contains name of communicaton interface and
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also contains the display orientation as first argument
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- u8g2.drawStr90 does not exist any more, use
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void u8g2_SetFontDirection(u8g2_t *u8g2, uint8_t dir);
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- "P" versions of the string functions are not yet implemented.
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This includes drawStrP(), getStrWidthP(), etc
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Use the print function with the F() macro instead.
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- In U8glib font transparency was defined in the .begin() statement. This is now
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handled by setFontMode().
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- Screen rotation is handled by the constructor in u8g2
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The functions undoRotation, setRot90, setRot180 and setRot270 are
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replaced by the first argument of the constructor
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- Screen scaling is not there in u8g2
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It is completly removed, there are no corresponding function in u8g2
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for undoScale() and setScale2x2().
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- setColorEntry(), setHiColor(), setHiColorByRGB(), setRGB: Not supported any more
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(u8g2 focus are monochrome displays, use Ucglib instead)
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- getMode(): Is not available any more because there is only one monochrome mode.
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- setDefaultForegroundColor(), setDefaultBackgroundColor() and
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setDefaultMidColor() are not required any more. These functions do not
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exist in U8g2. Use setDrawColor() instead.
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- getFontLineSpacing() and setFontLineSpacingFactor() are not supported any more.
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- getStrPixelWidth() is replaced by getStrWidth()
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- setHardwareBackup() not supported any more. Might be implemented later
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- Cursor functions are not available. This includes:
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setCursorFont(), setCursorStyle(), setCursorPos(), setCursorColor(),
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enableCursor(), disableCursor(), drawCursor()
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- Virtual screen handling is not supported:
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setVirtualScreenDimension(), addToVirtualScreen()
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Minor Changes (Code update might be required)
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- U8g2 drawTriangle() expects signed arguments (u8glib expects unsigned arguments)
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- U8g2 has different font names. Some of the old font names are known to u8g2 and are
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mapped automatically. If the font name is unknown, please choose a different font from the font list.
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Change Notes (No code change required)
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- sleepOn(), sleepOff(): supported, but better user setPowerSave()
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- setColorIndex() and getColorIndex() are renamed to setDrawColor() and
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getDrawColor(). The old names are still supported.
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- getFontAscent() and getFontDescent() are renamed to getAscent() and getDescent()
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The old names are still supported.
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- Signal names are renamed in the constructor calls:
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U8glib sck == U8g2 clock
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U8glib mosi == U8g2 data
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U8glib a0 == U8g2 dc
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- getHeight() renamed to getDisplayHeight(), old name still exists
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- getWidth() renamed to getDisplayWidth(), old name still exists
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