Unlike U8g2, which renders a full frame in the microcontroller's RAM before sending it to the display, U8x8 writes data directly to the display controller's memory.
Fixed Width: Every character (from an 'i' to a 'W') occupies the same amount of space.
LCD ST7920 and U8X8 To Save Memory Questions - Arduino Forum
The draw2x2String or draw2x2Glyph functions scale the 8x8 source glyph into a 16x16 pixel box. u8x8 fonts
There are legitimate use cases where a project might need both the graphics capabilities of U8g2 and the lightweight text rendering of U8x8. For instance, one might want to display sensor data using U8x8 for speed and memory efficiency while also showing simple graphical elements such as frames or progress bars using U8g2.
U8x8 fonts are stored as arrays of bytes in the microcontroller‘s flash memory (program memory). Each 8×8 character is represented by exactly 8 bytes, where each byte corresponds to one row of pixels in the character cell. Within each byte, the individual bits represent whether a pixel is on (1) or off (0) in that column.
If you call u8x8.setFont() with a u8g2_font_xxxx (note the g2 ), your compiler will throw an error. You must use the u8x8_font_xxxx variants. Unlike U8g2, which renders a full frame in
The choice between U8g2 and U8x8 involves meaningful trade-offs in terms of memory and performance:
The library is built for fast, minimalist projects, with a simple API for basic operations:
uint8_t buf[8]; u8x8_get_glyph_data(u8x8.getU8x8(), 'A', buf, 0); /* modify the tile in buf here */ u8x8.drawTile(1, 2, 1, buf); There are legitimate use cases where a project
prioritizes minimal memory footprints and rapid execution. This paper explores the architectural logic of U8x8 fonts, their role in text-only data visualization on monochrome OLEDs and LCDs, and why they remain a staple for Arduino and micro-controller enthusiasts despite the advent of high-definition screens. 1. Introduction to the U8x8 Sub-Library
'A' => ### # # # # # # # # ###
U8g2 and U8x8 include hundreds of open-source fonts. To help you navigate them, Oliver Kraus established a strict naming convention. A typical font name looks like this: u8x8_font_chroma48_hf
The primary reason developers choose U8x8 is its . Unlike U8g2, which needs a display buffer in the microcontroller's RAM, U8x8 writes data directly to the display. This feature is a lifesaver for smaller microcontrollers with only a few kilobytes of RAM, such as the ATmega328P in the Arduino Uno.
