See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
The Corne PCBs have a reset button next to the TRRS jack to enter in to the bootloader.
Additionally, if you hold down the "Q" or "P" buttons when plugging in that half of the keyboard (per the default QWERTY layout), this will jump to the bootloader and reset the EEPROM (persistent storage). This would normally be the very top corner-most position, but due to the breakaway column, it's left at Q and P for compatibility.
The Corne Keyboard also supports using the RGB Matrix feature, in place of RGB Light. This provids a better experience when using the keyboard, as it supports a number of per key effects properly. If you're not using the in switch LEDs, then you may want to pass on doing this.
In your keymap's `rules.mk` file, add the following:
// # define RGB_MATRIX_LED_PROCESS_LIMIT (DRIVER_LED_TOTAL + 4) / 5 // limits the number of LEDs to process in an animation per task run (increases keyboard responsiveness)
// # define RGB_MATRIX_LED_FLUSH_LIMIT 16 // limits in milliseconds how frequently an animation will update the LEDs. 16 (16ms) is equivalent to limiting to 60fps (increases keyboard responsiveness)
# define RGB_MATRIX_MAXIMUM_BRIGHTNESS 150 // limits maximum brightness of LEDs to 150 out of 255. Higher may cause the controller to crash.
# define RGB_MATRIX_HUE_STEP 8
# define RGB_MATRIX_SAT_STEP 8
# define RGB_MATRIX_VAL_STEP 8
# define RGB_MATRIX_SPD_STEP 10
/* Disable the animations you don't want/need. You will need to disable a good number of these *
* because they take up a lot of space. Disable until you can successfully compile your firmware. */
