83Plus:Software:usb8x/Asm Interface/KBD/KBDInit

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 passthrough callback will use the callback you specified during U_CALL_INIT if you're using the U_CALL system. Otherwise specifiy the callback in register BC.

See Also

• [[../KBDGetKey|KBDGetKey]] - Get keypresses