qmk_firmware/docs/feature_oled_driver.md

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# OLED Driver
## Supported Hardware
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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.
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!> 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.
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## 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`:
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```make
OLED_ENABLE = yes
```
## OLED type
|OLED Driver |Supported Device |
|-------------------|---------------------------|
|SSD1306 (default) |For both SSD1306 and SH1106|
e.g.
```make
OLED_DRIVER = SSD1306
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```
Then in your `keymap.c` file, implement the OLED task call. This example assumes your keymap has three layers named `_QWERTY`, `_FN` and `_ADJ`:
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```c
#ifdef OLED_ENABLE
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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);
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}
#endif
```
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## 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:
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```c
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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
};
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oled_write_P(qmk_logo, false);
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}
```
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## 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};
static void fade_display(void) {
//Define the reader structure
oled_buffer_reader_t reader;
uint8_t buff_char;
if (random() % 30 == 0) {
srand(timer_read());
// Fetch a pointer for the buffer byte at index 0. The return structure
// will have the pointer and the number of bytes remaining from this
// index position if we want to perform a sequential read by
// incrementing the buffer pointer
reader = oled_read_raw(0);
//Loop over the remaining buffer and erase pixels as we go
for (uint16_t i = 0; i < reader.remaining_element_count; i++) {
//Get the actual byte in the buffer by dereferencing the pointer
buff_char = *reader.current_element;
if (buff_char != 0) {
oled_write_raw_byte(buff_char & single_bit_masks[rand() % 8], i);
}
//increment the pointer to fetch a new byte during the next loop
reader.current_element++;
}
}
}
```
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## Other Examples
In split keyboards, it is very common to have two OLED displays that each render different content and are oriented or flipped differently. You can do this by switching which content to render by using the return value from `is_keyboard_master()` or `is_keyboard_left()` found in `split_util.h`, e.g:
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```c
#ifdef OLED_ENABLE
oled_rotation_t oled_init_user(oled_rotation_t rotation) {
if (!is_keyboard_master()) {
return OLED_ROTATION_180; // flips the display 180 degrees if offhand
}
return rotation;
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}
void oled_task_user(void) {
if (is_keyboard_master()) {
render_status(); // Renders the current keyboard state (layer, lock, caps, scroll, etc)
} else {
render_logo(); // Renders a static logo
oled_scroll_left(); // Turns on scrolling
}
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}
#endif
```
## Basic Configuration
|Define |Default |Description |
|---------------------------|-----------------|--------------------------------------------------------------------------------------------------------------------------|
|`OLED_DISPLAY_ADDRESS` |`0x3C` |The i2c address of the OLED Display |
|`OLED_FONT_H` |`"glcdfont.c"` |The font code file to use for custom fonts |
|`OLED_FONT_START` |`0` |The starting character index for custom fonts |
|`OLED_FONT_END` |`223` |The ending character index for custom fonts |
|`OLED_FONT_WIDTH` |`6` |The font width |
|`OLED_FONT_HEIGHT` |`8` |The font height (untested) |
|`OLED_TIMEOUT` |`60000` |Turns off the OLED screen after 60000ms of keyboard inactivity. Helps reduce OLED Burn-in. Set to 0 to disable. |
2021 May 29 Breaking Changes Update (#13034) * Add Per Key functionality for AutoShift (#11536) * LED Matrix: Reactive effect buffers & advanced indicators (#12588) * [Keyboard] kint36: switch to sym_eager_pk debouncing (#12626) * [Keyboard] kint2pp: reduce input latency by ≈10ms (#12625) * LED Matrix: Split (#12633) * [CI] Format code according to conventions (#12650) * feat: infinite timeout for leader key (#6580) * feat: implement leader_no_timeout logic * docs(leader_key): infinite leader timeout docs * Format code according to conventions (#12680) * Update ADC driver for STM32F1xx, STM32F3xx, STM32F4xx (#12403) * Fix default ADC_RESOLUTION for ADCv3 (and ADCv4) Recent ChibiOS update removed ADC_CFGR1_RES_10BIT from the ADCv3 headers (that macro should not have been there, because ADCv3 has CFGR instead of CFGR1). Fix the default value for ADC_RESOLUTION to use ADC_CFGR_RES_10BITS if it is defined (that name is used for ADCv3 and ADCv4). * Update ADC docs to match the actually used resolution ADC driver for ChibiOS actually uses the 10-bit resolution by default (probably to match AVR); fix the documentation accordingly. Also add both ADC_CFGR_RES_10BITS and ADC_CFGR1_RES_10BIT constants (these names differ according to the ADC implementation in the particular MCU). * Fix pinToMux() for B12 and B13 on STM32F3xx Testing on STM32F303CCT6 revealed that the ADC mux values for B12 and B13 pins were wrong. * Add support for all possible analog pins on STM32F1xx Added ADC mux values for pins A0...A7, B0, B1, C0...C5 on STM32F1xx (they are the same at least for STM32F103x8 and larger F103 devices, and also F102, F105, F107 families). Actually tested on STM32F103C8T6 (therefore pins C0...C5 were not tested). Pins F6...F10, which are present on STM32F103x[C-G] in 144-pin packages, cannot be supported at the moment, because those pins are connected only to ADC3, but the ChibiOS ADC driver for STM32F1xx supports only ADC1. * Add support for all possible analog pins on STM32F4xx Added ADC mux values for pins A0...A7, B0, B1, C0...C5 and optionally F3...F10 (if STM32_ADC_USE_ADC3 is enabled). These mux values are apparently the same for all F4xx devices, except some smaller devices may not have ADC3. Actually tested on STM32F401CCU6, STM32F401CEU6, STM32F411CEU6 (using various WeAct “Blackpill” boards); only pins A0...A7, B0, B1 were tested. Pins F3...F10 are inside `#if STM32_ADC_USE_ADC3` because some devices which don't have ADC3 also don't have the GPIOF port, therefore the code which refers to Fx pins does not compile. * Fix STM32F3xx ADC mux table in documentation The ADC driver documentation had some errors in the mux table for STM32F3xx. Fix this table to match the datasheet and the actual code (mux settings for B12 and B13 were also tested on a real STM32F303CCT6 chip). * Add STM32F1xx ADC pins to the documentation * Add STM32F4xx ADC pins to the documentation * Add initial support for tinyuf2 bootloader (when hosted on F411 blackpill) (#12600) * Add support for jumping to tinyuf2 bootloader. Adds blackpill UF2 example. * Update flashing.md * Update chconf.h * Update config.h * Update halconf.h * Update mcuconf.h * eeprom driver: Refactor where eeprom driver initialisation (and EEPROM emulation initialisation) occurs to make it non-target-specific. (#12671) * Add support for MCU = STM32F446 (#12619) * Add support for MCU = STM32F446 * Update platforms/chibios/GENERIC_STM32_F446XE/configs/config.h * Restore mcuconf.h to the one used by RT-STM32F446RE-NUCLEO64 * stm32f446: update mcuconf.h and board.h for 16MHz operation, with USB enabled, and other peripherals disabled. * Format code according to conventions (#12682) * Format code according to conventions (#12687) * Add STM32L433 and L443 support (#12063) * initial L433 commit * change to XC * fix L433 * disable all peripherals * update system and peripheral clocks * 433 change * use its own board files * revert its own board files * l433 specific change * fix stm32l432xx define * remove duplicate #define * fix bootloader jump * move to L443xx and add i2c2, spi2, usart3 to mcuconf.h * move to L443 * move to L443 * fix sdmmc in mcuconf.h * include STM32L443 * add L443 * Include L443 in compatible microcontrollers * Include L443 in compatible microcontrollers * Update config bootloader jump description * Update ChibiOS define reasoning * Update quantum/mcu_selection.mk * fix git conflict * Updated Function96 with V2 files and removed chconf.h and halconf.h (#12613) * Fix bad PR merge for #6580. (#12721) * Change RGB/LED Matrix to use a simple define for USB suspend (#12697) * [CI] Format code according to conventions (#12731) * Fixing transport's led/rgb matrix suspend state logic (#12770) * [CI] Format code according to conventions (#12772) * Fix comment parsing (#12750) * Added OLED fade out support (#12086) * fix some references to bin/qmk that slipped in (#12832) * Resolve a number of warnings in `qmk generate-api` (#12833) * New command: qmk console (#12828) * stash poc * stash * tidy up implementation * Tidy up slightly for review * Tidy up slightly for review * Bodge environment to make tests pass * Refactor away from asyncio due to windows issues * Filter devices * align vid/pid printing * Add hidapi to the installers * start preparing for multiple hid_listeners * udev rules for hid_listen * refactor to move closer to end state * very basic implementation of the threaded model * refactor how vid/pid/index are supplied and parsed * windows improvements * read the report directly when usage page isn't available * add per-device colors, the choice to show names or numbers, and refactor * add timestamps * Add support for showing bootloaders * tweak the color for bootloaders * Align bootloader disconnect with connect color * add support for showing all bootloaders * fix the pyusb check * tweaks * fix exception * hide a stack trace behind -v * add --no-bootloaders option * add documentation for qmk console * Apply suggestions from code review * pyformat * clean up and flesh out KNOWN_BOOTLOADERS * Remove pointless SERIAL_LINK_ENABLE rules (#12846) * Make Swap Hands use PROGMEM (#12284) This converts the array that the Swap Hands feature uses to use PROGMEM, and to read from that array, as such. Since this array never changes at runtime, there is no reason to keep it in memory. Especially for AVR boards, as memory is a precious resource. * Fix another bin/qmk reference (#12856) * [Keymap] Turn OLED off on suspend in soundmonster keymap (#10419) * Fixup build errors on `develop` branch. (#12723) * LED Matrix: Effects! (#12651) * Fix syntax error when compiling for ARM (#12866) * Remove KEYMAP and LAYOUT_kc (#12160) * alias KEYMAP to LAYOUT * remove KEYMAP and LAYOUT_kc * Add setup, clone, and env to the list of commands we allow even with broken modules (#12868) * Rename `point_t` -> `led_point_t` (#12864) * [Keyboard] updated a vendor name / fixed minor keymap issues (#12881) * Add missing LED Matrix suspend code to suspend.c (#12878) * LED Matrix: Documentation (#12685) * Deprecate `send_unicode_hex_string()` (#12602) * Fix spelling mistake regarding LED Matrix in split_common. (#12888) * [Keymap] Fix QWERTY/DVORAK status output for kzar keymap (#12895) * Use milc.subcommand.config instead of qmk.cli.config (#12915) * Use milc.subcommand.config instead * pyformat * remove the config test * Add function to allow repeated blinking of one layer (#12237) * Implement function rgblight_blink_layer_repeat to allow repeated blinking of one layer at a time * Update doc * Rework rgblight blinking according to requested change * optimize storage * Fixup housekeeping from being invoked twice per loop. (#12933) * matrix: wait for row signal to go HIGH for every row (#12945) I noticed this discrepancy (last row of the matrix treated differently than the others) when optimizing the input latency of my keyboard controller, see also https://michael.stapelberg.ch/posts/2021-05-08-keyboard-input-latency-qmk-kinesis/ Before this commit, when tuning the delays I noticed ghost key presses when pressing the F2 key, which is on the last row of the keyboard matrix: the dead_grave key, which is on the first row of the keyboard matrix, would be incorrectly detected as pressed. After this commit, all keyboard matrix rows are interpreted correctly. I suspect that my setup is more susceptible to this nuance than others because I use GPIO_INPUT_PIN_DELAY=0 and hence don’t have another delay that might mask the problem. * ensure we do not conflict with existing keymap aliases (#12976) * Add support for up to 4 IS31FL3733 drivers (#12342) * Convert Encoder callbacks to be boolean functions (#12805) * [Keyboard] Fix Terrazzo build failure (#12977) * Do not hard set config in CPTC files (#11864) * [Keyboard] Corne - Remove legacy revision support (#12226) * [Keymap] Update to Drashna keymap and user code (based on develop) (#12936) * Add Full-duplex serial driver for ARM boards (#9842) * Document LED_MATRIX_FRAMEBUFFER_EFFECTS (#12987) * Backlight: add defines for default level and breathing state (#12560) * Add dire message about LUFA mass storage bootloader (#13014) * [Keyboard] Remove redundant legacy and common headers for crkbd (#13023) Was causing compiler errors on some systems. * Fix keyboards/keymaps for boolean encoder callback changes (#12985) * `backlight.c`: include `eeprom.h` (#13024) * Add changelog for 2021-05-29 Breaking Changes merge (#12939) * Add ChangeLog for 2021-05-29 Breaking Changes Merge: initial version * Add recent develop changes * Sort recent develop changes * Remove sections for ChibiOS changes per tzarc No ChibiOS changes this round. * Add and sort recent develop changes * add notes about keyboard moves/deletions * import changelog for PR 12172 Documents the change to BOOTMAGIC_ENABLE. * update section headings * re-sort changelog * add additional note regarding Bootmagic changes * remove changelog timestamp * update dates in main Breaking Changes docs * fix broken section anchors in previous changelogs * add link to backlight/eeprom patch to changelog * highlight some more changes * link PRs from section headers * Restore standard readme * run: qmk cformat --core-only
2021-05-29 23:38:50 +02:00
|`OLED_FADE_OUT` |*Not defined* |Enables fade out animation. Use together with `OLED_TIMEOUT`. |
|`OLED_FADE_OUT_INTERVAL` |`0` |The speed of fade out animation, from 0 to 15. Larger values are slower. |
|`OLED_SCROLL_TIMEOUT` |`0` |Scrolls the OLED screen after 0ms of OLED inactivity. Helps reduce OLED Burn-in. Set to 0 to disable. |
|`OLED_SCROLL_TIMEOUT_RIGHT`|*Not defined* |Scroll timeout direction is right when defined, left when undefined. |
|`OLED_IC` |`OLED_IC_SSD1306`|Set to `OLED_IC_SH1106` if you're using the SH1106 OLED controller. |
|`OLED_COLUMN_OFFSET` |`0` |(SH1106 only.) Shift output to the right this many pixels.<br />Useful for 128x64 displays centered on a 132x64 SH1106 IC.|
|`OLED_BRIGHTNESS` |`255` |The default brightness level of the OLED, from 0 to 255. |
2020 November 28 Breaking Changes Update (#11053) * Branch point for 2020 November 28 Breaking Change * Remove matrix_col_t to allow MATRIX_ROWS > 32 (#10183) * Add support for soft serial to ATmega32U2 (#10204) * Change MIDI velocity implementation to allow direct control of velocity value (#9940) * Add ability to build a subset of all keyboards based on platform. * Actually use eeprom_driver_init(). * Make bootloader_jump weak for ChibiOS. (#10417) * Joystick 16-bit support (#10439) * Per-encoder resolutions (#10259) * Share button state from mousekey to pointing_device (#10179) * Add hotfix for chibios keyboards not wake (#10088) * Add advanced/efficient RGB Matrix Indicators (#8564) * Naming change. * Support for STM32 GPIOF,G,H,I,J,K (#10206) * Add milc as a dependency and remove the installed milc (#10563) * ChibiOS upgrade: early init conversions (#10214) * ChibiOS upgrade: configuration file migrator (#9952) * Haptic and solenoid cleanup (#9700) * XD75 cleanup (#10524) * OLED display update interval support (#10388) * Add definition based on currently-selected serial driver. (#10716) * New feature: Retro Tapping per key (#10622) * Allow for modification of output RGB values when using rgblight/rgb_matrix. (#10638) * Add housekeeping task callbacks so that keyboards/keymaps are capable of executing code for each main loop iteration. (#10530) * Rescale both ChibiOS and AVR backlighting. * Reduce Helix keyboard build variation (#8669) * Minor change to behavior allowing display updates to continue between task ticks (#10750) * Some GPIO manipulations in matrix.c change to atomic. (#10491) * qmk cformat (#10767) * [Keyboard] Update the Speedo firmware for v3.0 (#10657) * Maartenwut/Maarten namechange to evyd13/Evy (#10274) * [quantum] combine repeated lines of code (#10837) * Add step sequencer feature (#9703) * aeboards/ext65 refactor (#10820) * Refactor xelus/dawn60 for Rev2 later (#10584) * add DEBUG_MATRIX_SCAN_RATE_ENABLE to common_features.mk (#10824) * [Core] Added `add_oneshot_mods` & `del_oneshot_mods` (#10549) * update chibios os usb for the otg driver (#8893) * Remove HD44780 References, Part 4 (#10735) * [Keyboard] Add Valor FRL TKL (+refactor) (#10512) * Fix cursor position bug in oled_write_raw functions (#10800) * Fixup version.h writing when using SKIP_VERSION=yes (#10972) * Allow for certain code in the codebase assuming length of string. (#10974) * Add AT90USB support for serial.c (#10706) * Auto shift: support repeats and early registration (#9826) * Rename ledmatrix.h to match .c file (#7949) * Split RGB_MATRIX_ENABLE into _ENABLE and _DRIVER (#10231) * Split LED_MATRIX_ENABLE into _ENABLE and _DRIVER (#10840) * Merge point for 2020 Nov 28 Breaking Change
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|`OLED_UPDATE_INTERVAL` |`0` |Set the time interval for updating the OLED display in ms. This will improve the matrix scan rate. |
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## 128x64 & Custom sized OLED Displays
The default display size for this feature is 128x32 and all necessary defines are precalculated with that in mind. We have added a define, `OLED_DISPLAY_128X64`, to switch all the values to be used in a 128x64 display, as well as added a custom define, `OLED_DISPLAY_CUSTOM`, that allows you to provide the necessary values to the driver.
|Define |Default |Description |
|---------------------|---------------|----------------------------------------------------------------------------------------------------------------------------------------|
|`OLED_DISPLAY_128X64`|*Not defined* |Changes the display defines for use with 128x64 displays. |
|`OLED_DISPLAY_CUSTOM`|*Not defined* |Changes the display defines for use with custom displays.<br>Requires user to implement the below defines. |
|`OLED_DISPLAY_WIDTH` |`128` |The width of the OLED display. |
|`OLED_DISPLAY_HEIGHT`|`32` |The height of the OLED display. |
|`OLED_MATRIX_SIZE` |`512` |The local buffer size to allocate.<br>`(OLED_DISPLAY_HEIGHT / 8 * OLED_DISPLAY_WIDTH)`. |
|`OLED_BLOCK_TYPE` |`uint16_t` |The unsigned integer type to use for dirty rendering. |
|`OLED_BLOCK_COUNT` |`16` |The number of blocks the display is divided into for dirty rendering.<br>`(sizeof(OLED_BLOCK_TYPE) * 8)`. |
|`OLED_BLOCK_SIZE` |`32` |The size of each block for dirty rendering<br>`(OLED_MATRIX_SIZE / OLED_BLOCK_COUNT)`. |
|`OLED_COM_PINS` |`COM_PINS_SEQ` |How the SSD1306 chip maps it's memory to display.<br>Options are `COM_PINS_SEQ`, `COM_PINS_ALT`, `COM_PINS_SEQ_LR`, & `COM_PINS_ALT_LR`.|
|`OLED_SOURCE_MAP` |`{ 0, ... N }` |Precalculated source array to use for mapping source buffer to target OLED memory in 90 degree rendering. |
|`OLED_TARGET_MAP` |`{ 24, ... N }`|Precalculated target array to use for mapping source buffer to target OLED memory in 90 degree rendering. |
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### 90 Degree Rotation - Technical Mumbo Jumbo
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!> Rotation is unsupported on the SH1106.
```c
// OLED Rotation enum values are flags
typedef enum {
OLED_ROTATION_0 = 0,
OLED_ROTATION_90 = 1,
OLED_ROTATION_180 = 2,
OLED_ROTATION_270 = 3, // OLED_ROTATION_90 | OLED_ROTATION_180
} oled_rotation_t;
```
OLED displays driven by SSD1306 drivers only natively support in hardware 0 degree and 180 degree rendering. This feature is done in software and not free. Using this feature will increase the time to calculate what data to send over i2c to the OLED. If you are strapped for cycles, this can cause keycodes to not register. In testing however, the rendering time on an ATmega32U4 board only went from 2ms to 5ms and keycodes not registering was only noticed once we hit 15ms.
90 degree rotation is achieved by using bitwise operations to rotate each 8 block of memory and uses two precalculated arrays to remap buffer memory to OLED memory. The memory map defines are precalculated for remap performance and are calculated based on the display height, width, and block size. For example, in the 128x32 implementation with a `uint8_t` block type, we have a 64 byte block size. This gives us eight 8 byte blocks that need to be rotated and rendered. The OLED renders horizontally two 8 byte blocks before moving down a page, e.g:
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| | | | | | |
|---|---|---|---|---|---|
| 0 | 1 | | | | |
| 2 | 3 | | | | |
| 4 | 5 | | | | |
| 6 | 7 | | | | |
However the local buffer is stored as if it was Height x Width display instead of Width x Height, e.g:
| | | | | | |
|---|---|---|---|---|---|
| 3 | 7 | | | | |
| 2 | 6 | | | | |
| 1 | 5 | | | | |
| 0 | 4 | | | | |
So those precalculated arrays just index the memory offsets in the order in which each one iterates its data.
## OLED API
```c
// OLED rotation enum values are flags
typedef enum {
OLED_ROTATION_0 = 0,
OLED_ROTATION_90 = 1,
OLED_ROTATION_180 = 2,
OLED_ROTATION_270 = 3, // OLED_ROTATION_90 | OLED_ROTATION_180
} oled_rotation_t;
// Initialize the OLED display, rotating the rendered output based on the define passed in.
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// Returns true if the OLED was initialized successfully
bool oled_init(oled_rotation_t rotation);
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// Called at the start of oled_init, weak function overridable by the user
// rotation - the value passed into oled_init
// Return new oled_rotation_t if you want to override default rotation
oled_rotation_t oled_init_user(oled_rotation_t rotation);
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// Clears the display buffer, resets cursor position to 0, and sets the buffer to dirty for rendering
void oled_clear(void);
// Renders the dirty chunks of the buffer to OLED display
void oled_render(void);
// Moves cursor to character position indicated by column and line, wraps if out of bounds
// Max column denoted by 'oled_max_chars()' and max lines by 'oled_max_lines()' functions
void oled_set_cursor(uint8_t col, uint8_t line);
// Advances the cursor to the next page, writing ' ' if true
// Wraps to the begining when out of bounds
void oled_advance_page(bool clearPageRemainder);
// Moves the cursor forward 1 character length
// Advance page if there is not enough room for the next character
// Wraps to the begining when out of bounds
void oled_advance_char(void);
// Writes a single character to the buffer at current cursor position
// Advances the cursor while writing, inverts the pixels if true
// Main handler that writes character data to the display buffer
void oled_write_char(const char data, bool invert);
// Writes a string to the buffer at current cursor position
// Advances the cursor while writing, inverts the pixels if true
void oled_write(const char *data, bool invert);
// Writes a string to the buffer at current cursor position
// Advances the cursor while writing, inverts the pixels if true
// Advances the cursor to the next page, wiring ' ' to the remainder of the current page
void oled_write_ln(const char *data, bool invert);
// Pans the buffer to the right (or left by passing true) by moving contents of the buffer
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// Useful for moving the screen in preparation for new drawing
// oled_scroll_left or oled_scroll_right should be preferred for all cases of moving a static
// image such as a logo or to avoid burn-in as it's much, much less cpu intensive
void oled_pan(bool left);
// Returns a pointer to the requested start index in the buffer plus remaining
// buffer length as struct
oled_buffer_reader_t oled_read_raw(uint16_t start_index);
// Writes a string to the buffer at current cursor position
void oled_write_raw(const char *data, uint16_t size);
// Writes a single byte into the buffer at the specified index
void oled_write_raw_byte(const char data, uint16_t index);
// Sets a specific pixel on or off
// Coordinates start at top-left and go right and down for positive x and y
void oled_write_pixel(uint8_t x, uint8_t y, bool on);
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// Writes a PROGMEM string to the buffer at current cursor position
// Advances the cursor while writing, inverts the pixels if true
// Remapped to call 'void oled_write(const char *data, bool invert);' on ARM
void oled_write_P(const char *data, bool invert);
// Writes a PROGMEM string to the buffer at current cursor position
// Advances the cursor while writing, inverts the pixels if true
// Advances the cursor to the next page, wiring ' ' to the remainder of the current page
// Remapped to call 'void oled_write_ln(const char *data, bool invert);' on ARM
void oled_write_ln_P(const char *data, bool invert);
// Writes a PROGMEM string to the buffer at current cursor position
void oled_write_raw_P(const char *data, uint16_t size);
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// Can be used to manually turn on the screen if it is off
// Returns true if the screen was on or turns on
bool oled_on(void);
// Can be used to manually turn off the screen if it is on
// Returns true if the screen was off or turns off
bool oled_off(void);
// Returns true if the oled is currently on, false if it is
// not
bool is_oled_on(void);
// Sets the brightness level of the display
uint8_t oled_set_brightness(uint8_t level);
// Gets the current brightness level of the display
uint8_t oled_get_brightness(void);
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// Basically it's oled_render, but with timeout management and oled_task_user calling!
void oled_task(void);
// Called at the start of oled_task, weak function overridable by the user
void oled_task_user(void);
// Set the specific 8 lines rows of the screen to scroll.
// 0 is the default for start, and 7 for end, which is the entire
// height of the screen. For 128x32 screens, rows 4-7 are not used.
void oled_scroll_set_area(uint8_t start_line, uint8_t end_line);
// Sets scroll speed, 0-7, fastest to slowest. Default is three.
// Does not take effect until scrolling is either started or restarted
// the ssd1306 supports 8 speeds with the delay
// listed below betwen each frame of the scrolling effect
// 0=2, 1=3, 2=4, 3=5, 4=25, 5=64, 6=128, 7=256
void oled_scroll_set_speed(uint8_t speed);
// Begin scrolling the entire display right
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// Returns true if the screen was scrolling or starts scrolling
// NOTE: display contents cannot be changed while scrolling
bool oled_scroll_right(void);
// Begin scrolling the entire display left
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// Returns true if the screen was scrolling or starts scrolling
// NOTE: display contents cannot be changed while scrolling
bool oled_scroll_left(void);
// Turns off display scrolling
// Returns true if the screen was not scrolling or stops scrolling
bool oled_scroll_off(void);
// Returns true if the oled is currently scrolling, false if it is
// not
bool is_oled_scrolling(void);
// Inverts the display
// Returns true if the screen was or is inverted
bool oled_invert(bool invert);
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// Returns the maximum number of characters that will fit on a line
uint8_t oled_max_chars(void);
// Returns the maximum number of lines that will fit on the OLED
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uint8_t oled_max_lines(void);
```
!> Scrolling and rotation are unsupported on the SH1106.
## SSD1306.h Driver Conversion Guide
|Old API |Recommended New API |
|-------------------------|---------------------------------|
|`struct CharacterMatrix` |*removed - delete all references*|
|`iota_gfx_init` |`oled_init` |
|`iota_gfx_on` |`oled_on` |
|`iota_gfx_off` |`oled_off` |
|`iota_gfx_flush` |`oled_render` |
|`iota_gfx_write_char` |`oled_write_char` |
|`iota_gfx_write` |`oled_write` |
|`iota_gfx_write_P` |`oled_write_P` |
|`iota_gfx_clear_screen` |`oled_clear` |
|`matrix_clear` |*removed - delete all references*|
|`matrix_write_char_inner`|`oled_write_char` |
|`matrix_write_char` |`oled_write_char` |
|`matrix_write` |`oled_write` |
|`matrix_write_ln` |`oled_write_ln` |
|`matrix_write_P` |`oled_write_P` |
|`matrix_write_ln_P` |`oled_write_ln_P` |
|`matrix_render` |`oled_render` |
|`iota_gfx_task` |`oled_task` |
|`iota_gfx_task_user` |`oled_task_user` |