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# Debounce algorithm
QMK supports multiple debounce algorithms through its debounce API.
The logic for which debounce method called is below. It checks various defines that you have set in rules.mk
```
DEBOUNCE_DIR:= $(QUANTUM_DIR)/debounce
DEBOUNCE_TYPE?= sym_g
ifneq ($(strip $(DEBOUNCE_TYPE)), custom)
QUANTUM_SRC += $(DEBOUNCE_DIR)/$(strip $(DEBOUNCE_TYPE)).c
endif
```
# Debounce selection
| DEBOUNCE_TYPE | Description | What else is needed |
| ------------- | --------------------------------------------------- | ----------------------------- |
| Not defined | Use the default algorithm, currently sym_g | Nothing |
| custom | Use your own debounce code | ```SRC += debounce.c``` add your own debounce.c and implement necessary functions |
| anything_else | Use another algorithm from quantum/debounce/* | Nothing |
**Regarding split keyboards**:
The debounce code is compatible with split keyboards.
# Use your own debouncing code
* Set ```DEBOUNCE_TYPE = custom```.
* Add ```SRC += debounce.c```
* Add your own ```debounce.c```. Look at current implementations in ```quantum/debounce``` for examples.
* Debouncing occurs after every raw matrix scan.
* Use num_rows rather than MATRIX_ROWS, so that split keyboards are supported correctly.
# Changing between included debouncing methods
You can either use your own code, by including your own debounce.c, or switch to another included one.
Included debounce methods are:
* eager_pr - debouncing per row. On any state change, response is immediate, followed by locking the row ```DEBOUNCE``` milliseconds of no further input for that row.
For use in keyboards where refreshing ```NUM_KEYS``` 8-bit counters is computationally expensive / low scan rate, and fingers usually only hit one row at a time. This could be
appropriate for the ErgoDox models; the matrix is rotated 90°, and hence its "rows" are really columns, and each finger only hits a single "row" at a time in normal use.
* eager_pk - debouncing per key. On any state change, response is immediate, followed by ```DEBOUNCE``` milliseconds of no further input for that key
* sym_g - debouncing per keyboard. On any state change, a global timer is set. When ```DEBOUNCE``` milliseconds of no changes has occured, all input changes are pushed.
* sym_pk - debouncing per key. On any state change, a per-key timer is set. When ```DEBOUNCE``` milliseconds of no changes have occured on that key, the key status change is pushed.
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