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110 lines
4.1 KiB
110 lines
4.1 KiB
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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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