83Plus:Software:usb8x/Asm Interface/KBD/KBDInit
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Revision as of 21:45, 1 September 2006 by Dan Englender (Talk | contribs)
Synopsis
Name: KBDInit
Minimum usb8x version: 0.11
Initialize the keyboard driver and hardware
Inputs
- HL: Address of buffer for keyboard driver's RAM storage
- DE: Address of temporary buffer for descriptors
- A: Flags
- bit 0: reset = auto handle lock keys, reset = pass back locks as regular keys
- bit 1: Initial state of CAPS LOCK key
- bit 2: Initial state of NUM LOCK key
- bit 3: Initial state of SCROLL LOCK key
- bit 4: set = pass through call-backs to U_CALL_INIT's call-back
Outputs
- NC: Success
Destroys
- AF, BC, DE, HL, IX
Notes
Initializes the USB host but assumes the USB driver has already been initialized with [[../../DriverInit|DriverInit]]. KBDInit resets the callback address for use with the keyboard, so the callback address passed to U_CALL_INIT will not be used.
Use [[../KBDVersion|KBDVersion]] to find the exact amount of memory required for the keyboard driver's RAM, or just use 32 bytes as a safe static value.
The current version of usb8x does not set the LED indicators on the keyboard to indicate caps/num/scroll lock. If bit 0 of the flag byte is reset, however, the driver will still keep track of the lock status and modify keypresses as appropriate.
See Also
- [[../KBDGetKey|KBDGetKey]] - Get keypresses
