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tashtalk
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20210913-3

This commit is contained in:
lampmerchant 2021-09-13 18:53:32 -06:00
parent f403bcb93a
commit 7481fa16ac
1 changed files with 34 additions and 9 deletions
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43
firmware/one-chip.asm
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@ -758,7 +758,8 @@ DealWiR bsf INTCON,GIE ;Reenable interrupts
SendControlFrame
movlb 2
bcf INTCON,GIE ;Disable interrupts
call SendPreamble ;XX-25
call SendSyncPulse ;XX-23 Sync pulse because frame starts a dialog
call SendPreamble ;24-25
movf UR_DEST,W ;26
movwf LT_BUF ;27
DNOP ;28-29
@ -838,7 +839,8 @@ SendDataFrame
SendRts
movlb 2
bcf INTCON,GIE ;Disable interrupts
call SendPreamble ;XX-25
call SendSyncPulse ;XX-23 Sync pulse because frame starts a dialog
call SendPreamble ;24-25
movf UR_DEST,W ;26
movwf LT_BUF ;27
DNOP ;28-29
@ -957,14 +959,37 @@ SendCts
;All subs below assume that they're being called with BSR in bank 2
SendSyncPulse
movlw B'00001111' ;32 Make sure driver is turned off and data out
andwf LATA,F ;33 pin is ready to output 0 when turned on
movlw B'00010000' ;34 Load pattern to turn on driver
iorwf LATA,F ;00 Turn driver on
call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
DELAY 6 ;15-32
nop ;33
movlw B'11101111' ;34 Load pattern to turn off driver
andwf LATA,F ;00 Turn driver off
call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
DELAY 7 ;15-00
call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
DELAY 7 ;15-00
call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
DELAY 7 ;15-00
call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
DELAY 7 ;15-00
call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
DELAY 2 ;15-20
nop ;21
return ;22-23
SendPreamble
movlw B'01111110' ;Load the flag byte into the buffer for later
movwf LT_BUF ; "
movlw 4 ;Set the counter to send four pre-flag ones
movwf LT_ONES ; "
movlw B'00001111' ;Make sure driver is turned off and LocalTalk
andwf LATA,F ; pin is ready to output 0 when it's turned on
movlw B'00010000' ;Load pattern to turn on driver
movlw B'01111110' ;26 Load flag byte into the buffer for later
movwf LT_BUF ;27 "
movlw 4 ;28 Set the counter to send four pre-flag ones
movwf LT_ONES ;29 "
movlw B'00001111' ;30 Make sure driver is turned off and data out
andwf LATA,F ;31 pin is ready to output 0 when turned on
movlw B'00010000' ;32 Load pattern to turn on driver
SendPr1 nop ;33
nop ;34
xorwf LATA,F ;00 Invert LocalTalk pin for clock