Macintosh-SW/tashtalk
1
0
Fork 0
mirror of https://github.com/lampmerchant/tashtalk.git synced 2025-04-13 11:37:10 +00:00
Code Issues Projects Releases Wiki Activity

20240110

Browse Source
This commit is contained in:
lampmerchant 2024-01-10 07:05:38 -07:00
parent 16178a16ef
commit 0e15b7d230
1 changed files with 7 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
firmware/one-chip.asm
View File

@ -1374,7 +1374,7 @@ SendPoL DNOP ;32-33
movlw B'00101010' ;33 Get ready to tristate LT pin
tris 5 ;34 Tristate LT pin
bcf LATA,4 ;00 Switch transceiver to receive mode
bra SendPoW ;Go wait for the line to return to idle
return ;End transmission
SendPoZ nop ;34
bcf LATA,5 ;00 Drive bus to 0
call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
@ -1382,14 +1382,6 @@ SendPoZ nop ;34
movlw B'00101010' ;33 Get ready to tristate LT pin
tris 5 ;34 Tristate LT pin
bcf LATA,4 ;00 Switch transceiver to receive mode
SendPoW call SendDoUartSvc ;Service the UART receiver while we wait for
movlb 0 ; the LocalTalk bus to go high/idle again for
btfss PORTA,5 ; two consecutive reads, this protects us
bra SendPoW ; against interpreting the not-idle line as a
call SendDoUartSvc ; frame and preventing ourselves from sending
movlb 0 ; any data
btfss PORTA,5 ; "
bra SendPoW ; "
return ;End transmission
SendByteStuff
@ -1861,10 +1853,12 @@ InFErr
OutLostClock
EmpLostClock
FinishUp
movlb 0 ;Deactivate Timer2 and clear its interrupt flag
bcf T2CON,TMR2ON ; so anything that was waiting for it knows
bcf PIR1,TMR2IF ; that a receive event happened while waiting
clrf LR_CCRC1 ;Clear receiver CRC registers to ones since we
movlb 0 ;If the frame regs changed, deactivate Timer2
btfss FLAGS,LR_FRM ; and clear its interrupt flag so anything that
bra Finish2 ; was waiting for it knows that a frame was
bcf T2CON,TMR2ON ; received while waiting
bcf PIR1,TMR2IF ; "
Finish2 clrf LR_CCRC1 ;Clear receiver CRC registers to ones since we
decf LR_CCRC1,F ; don't have time to do this when we jump into
clrf LR_CCRC2 ; the receiver
decf LR_CCRC2,F ; "