?? key05r2.asm
字號:
releas8 cmp #$7E ;Scroll Lock Released
bne releas9
bclr pscrlck,status
releas9 cmp #$77 ;Num Lock Released
bne relea10
bclr pnumlck,status
relea10 jmp main ;Return to Main
*****************************************************
* *
* rel_ext - An Extended Key has been Released *
* *
*****************************************************
rel_ext jsr Receive ;Get Next byte
lda byte
cmp #$11 ;Right Alt Released
bne rel_ex2
bclr ralt,status
jmp alt_rel
rel_ex2 cmp #$14 ;Right Ctrl Released
bne rel_ex3
bclr rctrl,status
jmp ctrl_re
rel_ex3 jmp main ;Return to main
*****************************************************
* *
* LEDshow - Copies the 3 LSB of the LED register to *
* keyboard for the keyboards Status LED's *
* E.g. Num Lock, Caps Lock, Scroll Lock *
* Also makes their status present on *
* PORTB *
* *
*****************************************************
LEDshow lda LED
ora #$20 ;Set TXD High
and #$27
sta PORTB ;Made Status Avalible at PORTB
lda #$ED
sta byte
jsr transmit
jsr Receive
lda LED
and #$07
sta byte
jsr transmit
jmp main
*****************************************************
* *
* Transmit - Send Data stored at Byte to the *
* Keyboard. Result *
* *
*****************************************************
transmit
ldx #$08 ;8 Data Bits
bset clk,DDRA ;Set Clock Low
lda #$13 ;Delay 64uS
jsr delay
clra ;Clear Parity Register
bset data,DDRA ;Set Data Low
bclr clk,DDRA ;Release Clock Line
jsr highlow
loop ror byte
bcs mark
space bset data,DDRA ;Clear Bit
jmp next
mark bclr data,DDRA ;Clear Bit
inca ;Parity Calculation
next jsr highlow ;Wait for high to low transition
decx
bne loop
and #$01
bne clr_par
set_par bclr data,DDRA
jmp tr_ackn
clr_par bset data,DDRA
tr_ackn jsr highlow
bclr data,DDRA ;Release Data Line
jsr highlow
brset data,PORTA,error ;Check for Ack
brclr clk,PORTA,* ;Wait for idle line
bset clk,DDRA ;Prevent Keyboard from sending data
;(Clear to Send)
rts
error lda #$FF ;Reset
sta byte
jsr transmit
rts
*****************************************************
* *
* Receive - Get a Byte from the Keyboard. Result *
* stored in byte. *
* *
*****************************************************
Receive ldx #08 ;Number of Bits
clr PAR ;Clear Parity Register
bclr clk,DDRA ;Clear to Send
brset clk,PORTA,* ;wait for idle Clock
brset data,PORTA,Receive ;False Start Bit, Restart
Recdata ror byte
jsr highlow ;Wait for high to low Transision
brset data,PORTA,Recset
bclr 7,byte
jmp Recnext
Recset bset 7,byte
inc PAR
Recnext decx
bne Recdata ;Loop until 8 bits been received
jsr highlow
lda PORTA ;Read Parity Bit
rola ;Place in LSbit
rola
eor PAR ;Parity Bit Detection
and #$01
beq r_error
jsr highlow
brclr data,PORTA,r_error ;Stop Bit Detection
bset clk,DDRA ;Prevent Keyboard from sending data
;(Clear to Send)
rts
r_error lda #$FE ;Resend
sta byte
jsr Transmit
jmp Receive ;Try again
*****************************************************
* *
* highlow - Waits for next High to Low Transistion *
* on the Clock Line *
* *
*****************************************************
highlow brclr clk,PORTA,* ;Loop until Clk High
brset clk,PORTA,* ;Loop until Clk Low
rts
*****************************************************
* *
* ctrlhex & althex - Make sure keys pressed are *
* valid. If not, don't store them. Also converts *
* ASCII to binary and stores them in the ASCII *
* Storage Location *
* *
*****************************************************
ctrlhex cmp #'a' ;Convert 'a' - 'f' to binary
blo he1_ran
cmp #'f'
bhi outrang
sub #$57
jmp store
he1_ran cmp #'A' ;Convert 'A' - 'F' to binary
blo altdec
cmp #'F'
bhi outrang
sub #$37
jmp store
altdec cmp #'0' ;Convert '0' - '9' to binary
blo outrang
cmp #'9'
bhi outrang
sub #$30
store ldx asc+1 ;Shift Bytes Left
stx asc+0
ldx asc+2
stx asc+1
sta asc+2 ;Store as Binary
outrang jmp main
*****************************************************
* *
* alt_rel Alt Released. (Decimal Enter Routine) *
* Once both the ALT keys have been released *
* a calculation must be made to convert the *
* bytes found in ASCII Storage to binary *
* for transmission. *
* *
*****************************************************
alt_rel lda status ;Decimal Calculation
and #$30
bne complet ;One of the Alt Keys Still Pressed
lda asc
ldx #$64 ;x 100
mul
sta byte
lda asc+1
ldx #$0A ;x 10
mul
add asc+2 ;Add Units
add byte ;Add hundreds
sta byte
jsr RS232T ;Transmit number
jmp main ;Return to Main.
*****************************************************
* *
* ctrl_re Ctrl Released.(Hexadecimal Enter Routine) *
* Once both the CTRL keys have been released*
* a calculation must be made to convert the *
* bytes found in ASCII Storage to binary *
* for transmission. *
* *
*****************************************************
ctrl_re lda status
and #$C0
bne complet ;One of the Ctrl Keys Still Pressed
lda asc+1
lsla
lsla
lsla
lsla
add asc+2
sta byte
jsr RS232T ;Transmit Number
complet jmp main ;Return to Main
*****************************************************
* *
* clrasc - Clear ASCII Storage Locations (3 Bytes) *
* - These storage bytes are used for the *
* ALTDEC & CTRLHEX Routines. *
* *
*****************************************************
clrasc clr asc+0
clr asc+1
clr asc+2
jmp main
*****************************************************
* *
* RS-232 NRZ 8N1 Transmit Routine. *
* *
* Uses a 4.00 Mhz Crystal (2 Mhz Bus Speed) *
* to obtain a transmission speed of 9600 BPS *
* *
*****************************************************
RS232T ldx #8 ; Number of Bits (8)
bclr TXD,PORTB ; Start Bit (0)
lda #$1D ; 29 Cycles 6[29] + 6
jsr delay
brn *
nop
nop
nextbit ror byte
bcs rsmark
bclr TXD,PORTB ; Space (Logic 0)
jmp rsnext
rsmark bset TXD,PORTB ; Mark (Logic 1)
brn *
rsnext lda #$1C ; 28 Cycles 6[28] + 6
jsr delay
nop
nop
decx
bne nextbit
brn *
brn *
nop
bset TXD,PORTB ; Stop Bit (Logic 1)
lda #$1F ; 31 Cycles 6[31] + 6
jsr delay
rts
delay deca ; Delay = 6[A] + 6
bne delay
rts
*****************************************************
* *
* No-Shift - Lookup Table when Shift not Pressed *
* *
*****************************************************
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