mirror of https://github.com/wwarthen/RomWBW.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
166 lines
5.0 KiB
166 lines
5.0 KiB
;
|
|
;==================================================================================================
|
|
; CH376 NATIVE USB KEYBOARD DRIVER
|
|
;==================================================================================================
|
|
;
|
|
; This driver is designed to work within the TMS video driver for a CRT solution.
|
|
|
|
#DEFINE DEFM .DB
|
|
#DEFINE DEFB .DB
|
|
#DEFINE DEFW .DW
|
|
|
|
#IF (SYSTIM == TM_NONE)
|
|
.ECHO "*** ERROR: MKY REQUIRES SYSTEM TIMER -- NONE CONFIGURED!!!\n"
|
|
!!! ; FORCE AN ASSEMBLY ERROR
|
|
#ENDIF
|
|
|
|
#include "./ch376-native/keyboard.s"
|
|
|
|
; COUNT FOR INTERRUPT HANDLER TO TRIGGER KEYBOARD SCANNER (EG: SCAN KEYBOARD ONLY EVERY 2ND INTERRUPT (2/60))
|
|
SCAN_INT_PERIOD: .EQU 2
|
|
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
.DB 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
UKY_INTSTK: ; 128 bytes for keyboard interrupt stack - need ~52 bytes???
|
|
|
|
CHUKB_INIT:
|
|
CALL _keyboard_init
|
|
OR A
|
|
RET Z
|
|
|
|
; INSTALL INTERRUPT HANDLER
|
|
LD HL, (VEC_TICK+1)
|
|
LD (VEC_CHUKB_TICK+1), HL
|
|
|
|
LD HL, CHUKB_TICK
|
|
LD (VEC_TICK+1), HL
|
|
|
|
RET
|
|
|
|
CHUKB_TICK:
|
|
LD A, SCAN_INT_PERIOD ; SCAN THE KEYBOARD EVERY 'SCAN_INT_PERIOD' INTERRUPTS.
|
|
UKY_SCNCNT .EQU $ - 1
|
|
DEC A
|
|
LD (UKY_SCNCNT), A
|
|
JP NZ, HB_TICK
|
|
|
|
LD A, SCAN_INT_PERIOD
|
|
LD (UKY_SCNCNT), A
|
|
|
|
; we gonna need a bigger stack
|
|
|
|
LD (UKY_INT_SP),SP ; SAVE ORIGINAL STACK FRAME
|
|
LD SP,UKY_INTSTK ; USE DEDICATED INT STACK FRAME IN HI MEM
|
|
|
|
CALL _usb_kyb_tick
|
|
|
|
LD SP, $FFFF ; RESTORE ORIGINAL STACK FRAME
|
|
UKY_INT_SP .EQU $ - 2
|
|
;
|
|
|
|
|
|
VEC_CHUKB_TICK:
|
|
JP HB_TICK
|
|
|
|
; ### Function 0x4C -- Keyboard Status (VDAKST)
|
|
;
|
|
; Inputs:
|
|
; None
|
|
;
|
|
; Outputs:
|
|
; A: Status / Codes Pending
|
|
; B: Number of buffered usb reports
|
|
; A': USB Report Modifier Key State (valid if B > 0)
|
|
; B', C', D', E', H', L': USB Report's 6 key codes (valid only if B > 0)
|
|
;
|
|
; Return a count of the number of key Codes Pending (A) in the keyboard buffer.
|
|
; If it is not possible to determine the actual number in the buffer, it is
|
|
; acceptable to return 1 to indicate there are key codes available to read and
|
|
; 0 if there are none available.
|
|
; The value returned in register A is used as both a Status (A) code and the
|
|
; return value. Negative values (bit 7 set) indicate a standard HBIOS result
|
|
; (error) code. Otherwise, the return value represents the number of key codes
|
|
; pending.
|
|
;
|
|
; USB Keyboard Extension:
|
|
; Returns the current USB HID keyboard report data.
|
|
; Register B contains the number of buffered reports available:
|
|
; B = 0: No reports available
|
|
; B > 0: At least one report available (will be consumed after reading)
|
|
; When a report is available (B > 0):
|
|
; A': Contains modifier key states
|
|
; B',C',D',E',H',L': Contains up to 6 concurrent key codes
|
|
; See USB HID Usage Tables specification for key codes
|
|
|
|
UKY_STAT .EQU _usb_kyb_report
|
|
|
|
; ### Function 0x4D -- Video Keyboard Flush (VDAKFL)
|
|
;
|
|
; Inputs:
|
|
; None
|
|
;
|
|
; Outputs:
|
|
; A: standard HBIOS result code
|
|
;
|
|
; Purged and all contents discarded. The Status (A) is a standard HBIOS result code.
|
|
;
|
|
UKY_FLUSH .EQU _usb_kyb_flush
|
|
|
|
;
|
|
; ### Function 0x4E -- Video Keyboard Read (VDAKRD)
|
|
;
|
|
; Inputs:
|
|
; None
|
|
;
|
|
; Outputs:
|
|
; A: Status
|
|
; C: Scancode
|
|
; D: Keystate
|
|
; E: Keycode
|
|
;
|
|
; Read the next key data from the keyboard. If a buffer is used, return the next key code in the buffer.
|
|
; If no key data is available, this function will wait indefinitely for a key press. The Status (A) is a
|
|
; standard HBIOS result code.
|
|
;
|
|
; The Scancode (C) value is the raw scan code from the keyboard for the key press. Scan codes are standard
|
|
; usb scan codes
|
|
;
|
|
; The Keystate (D) is a bitmap representing the value of all modifier keys and shift states as they
|
|
; existed at the time of the keystroke. The bitmap is defined as:
|
|
;
|
|
; Bit Key state Indication
|
|
; 7 Key pressed was from the num pad
|
|
; 6 Caps Lock was active
|
|
; 5 Num Lock was active
|
|
; 4 Scroll Lock was active
|
|
; 3 Windows key was held down
|
|
; 2 Alt key was held down
|
|
; 1 Control key was held down
|
|
; 0 Shift key was held down
|
|
;
|
|
; The Keycode (E) is generally returned as appropriate ASCII values, if possible. Special keys, like
|
|
; function keys and arrows, are returned as reserved codes.
|
|
;
|
|
UKY_READ:
|
|
CALL _usb_kyb_buf_get_next
|
|
LD A, H
|
|
OR A
|
|
JR NZ, UKY_READ
|
|
LD C, L
|
|
XOR A
|
|
RET
|
|
|
|
|