U8x8 Fonts Official

Some display controllers rotate data differently. If your text appears mirrored or garbled, you may need to use the setFlipMode() function. U8x8 fonts are stored in a specific byte order; if your display uses a different page addressing mode, it will look like static.

As an embedded developer, you must constantly choose between features and resources.

| Feature | u8x8 (Font Mode) | U8g2 (Graphics Mode) | | :--- | :--- | :--- | | RAM Usage | ~0 bytes (plus display buffer) | 128 - 1024 bytes | | Flash Usage | Small (font data only) | Large (font + drawing routines) | | Font Height | Fixed 8 pixels (or multiples of 8) | Arbitrary (6px, 12px, 24px) | | Graphics | No (Text only) | Yes (Lines, circles, bitmaps) | | Speed | Very Fast | Moderate to Slow | | Text Placement | Only at char grid (Col, Row) | Any pixel coordinate | u8x8 fonts

When to use u8x8 fonts:

When not to use u8x8 fonts:

When you install the U8g2 library, you get access to dozens of u8x8 fonts. Here are the critical ones:

Let's get practical. Assume you have an SSD1306 128x64 I2C OLED connected to an Arduino. Some display controllers rotate data differently

You can convert any 8x8 pixel font using the U8g2 font tool (Python script from the U8g2 repository):

# Example: Convert a .bdf font
python bdf2u8g2.py myfont.bdf myfont.c --u8x8

Or use the online tool: u8g2 font converter When not to use u8x8 fonts: When you