qmk-firmware/docs/features/dynamic_macros.md

Dynamic Macros: Record and Replay Macros in Runtime

QMK supports temporary macros created on the fly. We call these Dynamic Macros. They are defined by the user from the keyboard and are lost when the keyboard is unplugged or otherwise rebooted.

You can store one or two macros and they may have a combined total of 128 keypresses. You can increase this size at the cost of RAM.

To enable them, first include DYNAMIC_MACRO_ENABLE = yes in your rules.mk. Then, add the following keys to your keymap:

Key	Alias	Description
QK_DYNAMIC_MACRO_RECORD_START_1	DM_REC1	Start recording Macro 1
QK_DYNAMIC_MACRO_RECORD_START_2	DM_REC2	Start recording Macro 2
QK_DYNAMIC_MACRO_PLAY_1	DM_PLY1	Replay Macro 1
QK_DYNAMIC_MACRO_PLAY_2	DM_PLY2	Replay Macro 2
QK_DYNAMIC_MACRO_RECORD_STOP	DM_RSTP	Finish the macro that is currently being recorded.

That should be everything necessary.

To start recording the macro, press either DM_REC1 or DM_REC2.

To finish the recording, press the DM_RSTP layer button. You can also press DM_REC1 or DM_REC2 again to stop the recording.

To replay the macro, press either DM_PLY1 or DM_PLY2.

It is possible to replay a macro as part of a macro. It's ok to replay macro 2 while recording macro 1 and vice versa but never create recursive macros i.e. macro 1 that replays macro 1. If you do so and the keyboard will get unresponsive, unplug the keyboard and plug it again. You can disable this completely by defining DYNAMIC_MACRO_NO_NESTING in your config.h file.

::: tip For the details about the internals of the dynamic macros, please read the comments in the process_dynamic_macro.h and process_dynamic_macro.c files. :::

Customization

There are a number of options added that should allow some additional degree of customization

Define	Default	Description
DYNAMIC_MACRO_SIZE	128	Sets the amount of memory that Dynamic Macros can use. This is a limited resource, dependent on the controller.
DYNAMIC_MACRO_USER_CALL	Not defined	Defining this falls back to using the user keymap.c file to trigger the macro behavior.
DYNAMIC_MACRO_NO_NESTING	Not Defined	Defining this disables the ability to call a macro from another macro (nested macros).
DYNAMIC_MACRO_DELAY	Not Defined	Sets the waiting time (ms unit) when sending each key.

If the LEDs start blinking during the recording with each keypress, it means there is no more space for the macro in the macro buffer. To fit the macro in, either make the other macro shorter (they share the same buffer) or increase the buffer size by adding the DYNAMIC_MACRO_SIZE define in your config.h (default value: 128; please read the comments for it in the header).

DYNAMIC_MACRO_USER_CALL

For users of the earlier versions of dynamic macros: It is still possible to finish the macro recording using just the layer modifier used to access the dynamic macro keys, without a dedicated DM_RSTP key. If you want this behavior back, add #define DYNAMIC_MACRO_USER_CALL to your config.h and insert the following snippet at the beginning of your process_record_user() function:

	uint16_t macro_kc = (keycode == MO(_DYN) ? DM_RSTP : keycode);

	if (!process_record_dynamic_macro(macro_kc, record)) {
		return false;
	}

User Hooks

There are a number of hooks that you can use to add custom functionality and feedback options to Dynamic Macro feature. This allows for some additional degree of customization.

Note, that direction indicates which macro it is, with 1 being Macro 1, -1 being Macro 2, and 0 being no macro.

• dynamic_macro_record_start_user(int8_t direction) - Triggered when you start recording a macro.
• dynamic_macro_play_user(int8_t direction) - Triggered when you play back a macro.
• dynamic_macro_record_key_user(int8_t direction, keyrecord_t *record) - Triggered on each keypress while recording a macro.
• dynamic_macro_record_end_user(int8_t direction) - Triggered when the macro recording is stopped.

Additionally, you can call dynamic_macro_led_blink() to flash the backlights if that feature is enabled.