qmk_firmware_custom/keyboards/ivy/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

extern keymap_config_t keymap_config;

// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.

enum pad_layers {
  _L1,
  _FUNC
};

// Defines for task manager and such
#define CALTDEL LCTL(LALT(KC_DEL))
#define TSKMGR LCTL(LSFT(KC_ESC))

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

/* Layer 1
 * ,------.
 * |  1   |
 * |------|
 * |  2   |
 * |------|
 * |  FN  |
 * `------'
 */
[_L1] = LAYOUT( \
    KC_1, \
    KC_2, \
    MO(_FUNC)  \
),

[_FUNC] = LAYOUT( \
    CALTDEL, \
    TSKMGR, \
    _______ \
)

};

void matrix_init_user(void) {

}