qmk_firmware/docs/feature_encoders.md

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# Encoders
Basic encoders are supported by adding this to your `rules.mk`:
```make
ENCODER_ENABLE = yes
```
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and this to your `config.h`:
```c
#define ENCODERS_PAD_A { B12 }
#define ENCODERS_PAD_B { B13 }
```
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Each PAD_A/B variable defines an array so multiple encoders can be defined, e.g.:
```c
#define ENCODERS_PAD_A { encoder1a, encoder2a }
#define ENCODERS_PAD_B { encoder1b, encoder2b }
```
If your encoder's clockwise directions are incorrect, you can swap the A & B pad definitions. They can also be flipped with a define:
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```c
#define ENCODER_DIRECTION_FLIP
```
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Additionally, the resolution, which defines how many pulses the encoder registers between each detent, can be defined with:
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```c
#define ENCODER_RESOLUTION 4
```
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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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It can also be defined per-encoder, by instead defining:
```c
#define ENCODER_RESOLUTIONS { 4, 2 }
```
## Split Keyboards
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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If you are using different pinouts for the encoders on each half of a split keyboard, you can define the pinout (and optionally, resolutions) for the right half like this:
```c
#define ENCODERS_PAD_A_RIGHT { encoder1a, encoder2a }
#define ENCODERS_PAD_B_RIGHT { encoder1b, encoder2b }
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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#define ENCODER_RESOLUTIONS_RIGHT { 2, 4 }
```
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## Callbacks
The callback functions can be inserted into your `<keyboard>.c`:
```c
void encoder_update_kb(uint8_t index, bool clockwise) {
encoder_update_user(index, clockwise);
}
```
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or `keymap.c`:
```c
void encoder_update_user(uint8_t index, bool clockwise) {
if (index == 0) { /* First encoder */
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if (clockwise) {
tap_code(KC_PGDN);
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} else {
tap_code(KC_PGUP);
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}
} else if (index == 1) { /* Second encoder */
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if (clockwise) {
tap_code(KC_DOWN);
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} else {
tap_code(KC_UP);
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}
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}
}
```
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## Hardware
The A an B lines of the encoders should be wired directly to the MCU, and the C/common lines should be wired to ground.