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|
# OLED Driver
## Supported Hardware
OLED modules using SSD1306 or SH1106 driver ICs, communicating over I2C.
Tested combinations:
|IC |Size |Platform|Notes |
|---------|------|--------|------------------------|
|SSD1306 |128x32|AVR |Primary support |
|SSD1306 |128x64|AVR |Verified working |
|SSD1306 |128x32|Arm | |
|SH1106 |128x64|AVR |No rotation or scrolling|
Hardware configurations using Arm-based microcontrollers or different sizes of OLED modules may be compatible, but are untested.
!> Warning: This OLED driver currently uses the new i2c_master driver from Split Common code. If your split keyboard uses I2C to communicate between sides, this driver could cause an address conflict (serial is fine). Please contact your keyboard vendor and ask them to migrate to the latest Split Common code to fix this. In addition, the display timeout system to reduce OLED burn-in also uses Split Common to detect keypresses, so you will need to implement custom timeout logic for non-Split Common keyboards.
## Usage
To enable the OLED feature, there are three steps. First, when compiling your keyboard, you'll need to add the following to your `rules.mk`:
```make
OLED_DRIVER_ENABLE = yes
```
Then in your `keymap.c` file, implement the OLED task call. This example assumes your keymap has three layers named `_QWERTY`, `_FN` and `_ADJ`:
```c
#ifdef OLED_DRIVER_ENABLE
void oled_task_user(void) {
// Host Keyboard Layer Status
oled_write_P(PSTR("Layer: "), false);
switch (get_highest_layer(layer_state)) {
case _QWERTY:
oled_write_P(PSTR("Default\n"), false);
break;
case _FN:
oled_write_P(PSTR("FN\n"), false);
break;
case _ADJ:
oled_write_P(PSTR("ADJ\n"), false);
break;
default:
// Or use the write_ln shortcut over adding '\n' to the end of your string
oled_write_ln_P(PSTR("Undefined"), false);
}
// Host Keyboard LED Status
led_t led_state = host_keyboard_led_state();
oled_write_P(led_state.num_lock ? PSTR("NUM ") : PSTR(" "), false);
oled_write_P(led_state.caps_lock ? PSTR("CAP ") : PSTR(" "), false);
oled_write_P(led_state.scroll_lock ? PSTR("SCR ") : PSTR(" "), false);
}
#endif
```
## Logo Example
In the default font, certain ranges of characters are reserved for a QMK logo. To render this logo to the OLED screen, use the following code example:
```c
static void render_logo(void) {
static const char PROGMEM qmk_logo[] = {
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, 0x93, 0x94,
0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, 0xB4,
0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0x00
};
oled_write_P(qmk_logo, false);
}
```
## Buffer Read Example
For some purposes, you may need to read the current state of the OLED display
buffer. The `oled_read_raw` function can be used to safely read bytes from the
buffer.
In this example, calling `fade_display` in the `oled_task_user` function will
slowly fade away whatever is on the screen by turning random pixels black over
time.
```c
//Setup some mask which can be or'd with bytes to turn off pixels
const uint8_t single_bit_masks[8] = {127, 191, 223, 239, 247, 251, 253, 254};
|
