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# Custom Userspace Callback Functions
Specifically QMK works by using customized callback functions for everything. This allows for multiple levels of customization.
`matrix_scan` calls `matrix_scan_kb`, which calls `matrix_scan_user`.
`process_record` calls a bunch of stuff, but eventually calls `process_record_kb` which calls `process_record_user`
The same goes for `matrix_init`, `layer_state_set`, `led_set`, and a few other functions.
All (most) `_user` functions are handled here, in the userspace instead. To allow keyboard specific configuration, I've created `_keymap` functions that can be called by the keymap.c files instead.
This allows for keyboard specific configuration while maintaining the ability to customize the board.
My [Ergodox EZ Keymap](https://github.com/qmk/qmk_firmware/blob/master/layouts/community/ergodox/drashna/keymap.c) is a good example of this, as it uses the LEDs as modifier indicators.
You can see a list of these files in [callbacks.c](callbacks.c), or a shortend list here
```c
__attribute__((weak)) void keyboard_post_init_keymap(void) {}
void keyboard_post_init_user(void) {
keyboard_post_init_keymap();
}
__attribute__((weak)) void matrix_scan_keymap(void) {}
void matrix_scan_user(void) {
matrix_scan_keymap();
}
__attribute__ ((weak)) bool process_record_keymap(uint16_t keycode, keyrecord_t *record) { return true; }
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
if (!process_record_keymap(keycode, record)) { return false; }
return true;
}
__attribute__((weak)) layer_state_t layer_state_set_keymap(layer_state_t state) { return state; }
layer_state_t layer_state_set_user(layer_state_t state) {
state = layer_state_set_keymap(state);
return state;
}
__attribute__ ((weak)) void led_set_keymap(uint8_t usb_led) {}
void led_set_user(uint8_t usb_led) {
led_set_keymap(usb_led);
}
__attribute__ ((weak)) void suspend_power_down_keymap(void) {}
void suspend_power_down_user(void) {
suspend_power_down_keymap();
}
__attribute__ ((weak)) void suspend_wakeup_init_keymap(void) {}
void suspend_wakeup_init_user(void) {
suspend_wakeup_init_keymap();
}
__attribute__((weak)) bool shutdown_keymap(bool jump_to_bootloader) {
return true;
}
bool shutdown_user(bool jump_to_bootloader) {
if (!shutdown_keymap(jump_to_bootloader)) {
return false;
}
return true;
}
__attribute__ ((weak)) void eeconfig_init_keymap(void) {}
void eeconfig_init_user(void) {
eeconfig_update_user(0);
eeconfig_init_keymap();
}
```
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