Keyboard Scan
Note
Kscan APIs are deprecated, any driver and applications should be ported over to use Input instead.
Overview
The kscan driver (keyboard scan matrix) is used for detecting a key press in a connected matrix keyboard or any device with buttons such as joysticks. Typically, matrix keyboards are implemented using a two-dimensional configuration in order to sense several keys. This allows interfacing to many keys through fewer physical pins. Keyboard matrix drivers read the rows while applying power through the columns one at a time with the purpose of detecting key events. There is no correlation between the physical and electrical layout of keys. For, example, the physical layout may be one array of 16 or fewer keys, which may be electrically connected to a 4 x 4 array. In addition, key values are defined by a keymap provided by the keyboard manufacturer.
Configuration Options
Related configuration options: