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[Docs] MATRIX_MASKED docs for SPLIT_HAND_MATRIX_GRID (#11974)

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Trevor Elliott 2021-03-01 21:29:11 -08:00 committed by GitHub
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docs/feature_split_keyboard.md
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@ -109,6 +109,10 @@ Normally, when a diode is connected to an intersection, it is judged to be left.
#define SPLIT_HAND_MATRIX_GRID_LOW_IS_RIGHT
```
Note that adding a diode at a previously unused intersection will effectively tell the firmware that there is a key held down at that point. You can instruct qmk to ignore that intersection by defining `MATRIX_MASKED` and then defining a `matrix_row_t matrix_mask[MATRIX_ROWS]` array in your keyboard config. Each bit of a single value (starting form the least-significant bit) is used to tell qmk whether or not to pay attention to key presses at that intersection.
While `MATRIX_MASKED` isn't necessary to use `SPLIT_HAND_MATRIX_GRID` successfully, without it you may experience issues trying to suspend your computer with your keyboard attached as the matrix will always report at least one key-press.
#### Handedness by EEPROM
This method sets the keyboard's handedness by setting a flag in the persistent storage (`EEPROM`). This is checked when the controller first starts up, and determines what half the keyboard is, and how to orient the keyboard layout.