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#include QMK_KEYBOARD_H enum custom_keycodes { KC_HELLO = SAFE_RANGE, }; const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = { LAYOUT_ortho_1x1(KC_HELLO) }; bool process_record_user(uint16_t keycode, keyrecord_t *record) { switch (keycode) { case KC_HELLO: if (record->event.pressed) { println("Hello world!"); } return false; } return true; }