20230920
This commit is contained in:
lampmerchant
parent
7b9799b6a4
commit
fd7b098638
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@ -8,22 +8,6 @@
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;
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;;; License ;;;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Connections ;;;
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;;; ;;;
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@ -77,7 +61,13 @@ DNOP macro
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;FLAGS:
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LR_FRM equ 7 ;Set when received frame registers have changed
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CTS_PLS equ 6 ;Set when a CTS frame should trigger a send from queue
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LR_CROK equ 6 ;Set when CRC of last frame passed
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CTS_PLS equ 5 ;Set when a CTS frame should trigger a send from queue
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TMPFLAG equ 4 ;Used as temporary storage in transmitter
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;FEATURES:
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CALCCRC equ 7 ;Set if transmitter should calculate CRC itself
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CHKCRC equ 6 ;Set if receiver should check CRC and signal bad CRCs
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;;; Variable Storage ;;;
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@ -86,18 +76,18 @@ CTS_PLS equ 6 ;Set when a CTS frame should trigger a send from queue
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FLAGS ;You've got to have flags
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LR_BUF ;Receiver buffer
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LR_BUF2 ;Receiver buffer
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LR_CCRC1 ;Receiver CRC register
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LR_CCRC2 ; "
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LR_STATE ;Receiver state pointer
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UR_LEN ;Current length of UART receiver queue
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GBACKOFF ;Global backoff mask
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LBACKOFF ;Local backoff mask
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COL_HIST ;Collision history for last 8 transmissions
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DEF_HIST ;Deferral history for last 8 transmissions
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UR_DEST ;First five bytes of frame loaded for transmission
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UR_SRC ; "
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UR_TYPE ; "
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UR_4TH ; "
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UR_5TH ; "
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ATTEMPTS ;Number of attempts at this transmission
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FEATURES ;Feature flags
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D2
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D1
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D0
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@ -144,16 +134,19 @@ CTS_PLS equ 6 ;Set when a CTS frame should trigger a send from queue
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FSR1L_TM ;Temp registers when using FSR1 to modify the node ID
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INDF1_TM ; bitmap
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LT_CRC1 ;Running CRC value calculated by SendByte
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LT_CRC1 ;Running CRC value calculated by SendByte/SendFromQueue
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LT_CRC2 ; "
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LT_CRCX ;Temp variable used by SendByte when calculating CRC
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LT_CRCX ;Temp variable used when calculating CRC
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LT_LENH ;Number of bytes to be read from queue by SendFromQueue
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LT_LENL ; "
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LT_BUF ;Buffer used to hold the byte being sent over LocalTalk
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LT_BUF2 ;Temporary buffer
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LT_ONES ;Count of consecutive ones sent by LT transmitter
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LR_CCRC1 ;CRC register used to calculate the CRC of incoming
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LR_CCRC2 ; control frames
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UR_DEST ;First five bytes of frame loaded for transmission
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UR_SRC ; "
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UR_TYPE ; "
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UR_4TH ; "
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UR_5TH ; "
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endc
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@ -262,8 +255,30 @@ Init
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movlw B'11001000'
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movwf INTCON
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clrf FEATURES ;All optional features off to start
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clrf LR_CCRC1 ;Receiver CRC registers cleared to ones to
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decf LR_CCRC1,F ; start, we don't have time to do this when we
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clrf LR_CCRC2 ; jump into the code
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decf LR_CCRC2,F
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bra PrepForNextFrame
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;entered with BSR = 2
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AwaitFeatures
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call CheckLtReceiver ;Check for and deal with receiver activity
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movf UR_LEN,W ;If there isn't yet a byte in the UART receiver
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addlw -1 ; queue, loop around again
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btfss STATUS,C ; "
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bra AwaitFeatures ; "
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movwf UR_LEN ;Decrement the UART receiver queue size by 1
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movlw B'11111011' ;If the pop off the queue dropped the length
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btfss UR_LEN,6 ; below 64, assert CTS so the host sends us
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andwf LATA,F ; data again
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moviw FSR1++ ;Pop the next byte off the UART receiver queue
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bcf FSR1L,7 ; "
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movwf FEATURES ;Store this byte into the features bitmap
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bra AwaitCommand ;Return to await next command
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;entered with BSR = 2
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AwaitNodeId
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call CheckLtReceiver ;Check for and deal with receiver activity
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@ -393,6 +408,9 @@ AwaitCommand
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addlw -1 ;If it's two, that's the command byte for
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btfsc STATUS,Z ; setting the node ID bitmap, so go wait for
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bra AwaitNodeId ; that data
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addlw -1 ;If it's three, that's the command byte for
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btfsc STATUS,Z ; setting the features bitmap, so go wait for
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bra AwaitFeatures ; that data
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bra AwaitCommand ;All other commands are considered no-ops
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;entered with BSR = ?
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@ -442,7 +460,7 @@ PrepForNextFrame
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btfsc WREG,7 ; "
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clrf DEF_HIST ; "
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btfsc WREG,7 ; "
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decf DEF_HIST ; "
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decf DEF_HIST,F ; "
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lslf COL_HIST,F ;Progress the collision and deferral history
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lslf DEF_HIST,F ; logs to make space for what happens this time
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movf GBACKOFF,W ;Copy the global backoff mask into the local
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@ -545,9 +563,10 @@ WaitToSendCtrl
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WTSC1 bcf INTCON,GIE ;Disable interrupts before checking Timer2
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btfss PIR1,TMR2IF ;Unless Timer2 has interrupted, loop around
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bra WaitToSendCtrl ; again
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btfss UR_TYPE,7 ;If the loaded frame is a control frame, just
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bra WTSC2 ; go ahead and send it and then prepare for the
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call SendControlFrame; next frame
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movlb 2 ;If the loaded frame is a control frame, just
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btfss UR_TYPE,7 ; go ahead and send it and then prepare for the
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bra WTSC2 ; next frame
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call SendControlFrame; "
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bra PrepForNextFrame; "
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WTSC2 call SendRts ;If it's a data frame, send an RTS frame first
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movlb 0 ;Set Timer2 to interrupt after 200us, the
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@ -556,21 +575,23 @@ WTSC2 call SendRts ;If it's a data frame, send an RTS frame first
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bsf T2CON,TMR2ON ;Activate Timer2
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clrf TMR2 ;Reset Timer2
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bcf PIR1,TMR2IF ;Clear the Timer2 interrupt flag
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incf UR_DEST,W ;If frame's destination is broadcast (0xFF)
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btfsc STATUS,Z ; then we want to wait for 200us of silence
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bra WaitForSilence ; before sending; otherwise we want to wait for
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bra WaitForCts ; a CTS frame and 200us is our timeout
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movlb 2 ;If frame's destination is broadcast (0xFF)
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incf UR_DEST,W ; then we want to wait for 200us of silence
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movlb 0 ; before sending; otherwise we want to wait for
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btfsc STATUS,Z ; a CTS frame and 200us is our timeout
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bra WaitForSilence ; "
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bra WaitForCts ; "
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;entered with BSR = ?
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GiveUp
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movlb 2
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btfsc UR_TYPE,7 ;If loaded frame is a control frame, we already
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bra PrepForNextFrame; have it in full
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movlb 2 ;If loaded frame is a data frame, we need to
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movf UR_4TH,W ; extract the length from the 4th and 5th bytes
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andlw B'00000011' ; and drain that many characters from the UART
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movwf LT_LENH ; receiver queue (even if it doesn't already
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movf UR_5TH,W ; contain all of them)
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movwf LT_LENL ; "
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movf UR_4TH,W ;If loaded frame is a data frame, we need to
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andlw B'00000011' ; extract the length from the 4th and 5th bytes
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movwf LT_LENH ; and drain that many characters from the UART
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movf UR_5TH,W ; receiver queue (even if it doesn't already
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movwf LT_LENL ; contain all of them)
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GiveUp1 movlw -1 ;Decrement the length counter; if it was
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addwf LT_LENL,F ; already zero, we're done
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addwfc LT_LENH,F ; "
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@ -663,6 +684,8 @@ DealWithFrame
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btfss FLAGS,LR_FRM ;If the incoming frame regs haven't changed,
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return ; we have nothing to do here
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bcf FLAGS,LR_FRM ;This is so we know if regs changed under us
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btfss FLAGS,LR_CROK ;If the frame's CRC check failed, the frame is
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return ; invalid, ignore it
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btfss LR_TYPE,7 ;If the frame is not a control frame, there's
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return ; nothing to do; host handles data frames
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movf FSR1L,W ;Using the node ID bitmap, check whether this
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@ -687,55 +710,6 @@ DealWithFrame
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movf INDF1_TM,F ; "
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btfsc STATUS,Z ; "
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return ; "
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clrf LR_CCRC1 ;Clear the CRC check registers to all ones so
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clrf LR_CCRC2 ; we can start checking the CRC of the frame
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decf LR_CCRC1,F ; "
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decf LR_CCRC2,F ; "
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movf LR_DEST,W ;Update the CRC check registers with the frame
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xorwf LR_CCRC1,W ; destination
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movwf LR_CCRC1 ; "
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movlp high CrcLut1 ; "
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callw ; "
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xorwf LR_CCRC2,W ; "
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xorwf LR_CCRC1,F ; "
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xorwf LR_CCRC1,W ; "
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xorwf LR_CCRC1,F ; "
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movlp high CrcLut2 ; "
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callw ; "
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movwf LR_CCRC2 ; "
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movf LR_SRC,W ;Update the CRC check registers with the frame
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xorwf LR_CCRC1,W ; source
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movwf LR_CCRC1 ; "
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movlp high CrcLut1 ; "
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callw ; "
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xorwf LR_CCRC2,W ; "
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xorwf LR_CCRC1,F ; "
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xorwf LR_CCRC1,W ; "
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xorwf LR_CCRC1,F ; "
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movlp high CrcLut2 ; "
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callw ; "
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movwf LR_CCRC2 ; "
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movf LR_TYPE,W ;Update the CRC check registers with the frame
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xorwf LR_CCRC1,W ; type
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movwf LR_CCRC1 ; "
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movlp high CrcLut1 ; "
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callw ; "
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xorwf LR_CCRC2,W ; "
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xorwf LR_CCRC1,F ; "
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xorwf LR_CCRC1,W ; "
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xorwf LR_CCRC1,F ; "
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movlp high CrcLut2 ; "
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callw ; "
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movwf LR_CCRC2 ; "
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movlp 0 ; "
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comf LR_CCRC1,W ;If the calculated CRC does not match the
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xorwf LR_CRC1,W ; received one, the frame is invalid and we're
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btfss STATUS,Z ; done
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return ; "
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comf LR_CCRC2,W ; "
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xorwf LR_CRC2,W ; "
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btfss STATUS,Z ; "
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return ; "
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bcf INTCON,GIE ;Disable interrupts so frame vars don't change
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btfsc FLAGS,LR_FRM ;If this flag is set, regs changed under us so
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bra DealWiR ; we can't act, reenable interrupts and return
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@ -784,13 +758,16 @@ SendControlFrame
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DNOP ;30-31
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call SendByte ;32-25
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movf UR_4TH,W ;26
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movwf LT_BUF ;27
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DNOP ;28-29
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DNOP ;30-31
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btfsc FEATURES,CALCCRC;27
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comf LT_CRC1,W ;28
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movwf LT_BUF ;29
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comf LT_CRC2,W ;30
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movwf LT_BUF2 ;31
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call SendByte ;32-25
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movf UR_5TH,W ;26
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movwf LT_BUF ;27
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DNOP ;28-29
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btfsc FEATURES,CALCCRC;27
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movf LT_BUF2,W ;28
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movwf LT_BUF ;29
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DNOP ;30-31
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call SendByte ;32-25
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DNOP ;26-27
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@ -819,24 +796,31 @@ SendDataFrame
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call SendByte ;32-25
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movf UR_TYPE,W ;26
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movwf LT_BUF ;27
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DNOP ;28-29
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DNOP ;30-31
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nop ;28
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bsf FLAGS,TMPFLAG ;29 If frame length is 2, we need to overwrite
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btfss FEATURES,CALCCRC;30 the CRC bytes with our calculated CRC; if
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bcf FLAGS,TMPFLAG ;31 the feature is off, never do this
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call SendByte ;32-25
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movf UR_4TH,W ;26
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movwf LT_BUF ;27
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andlw B'00000011' ;28
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movwf LT_LENH ;29
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DNOP ;30-31
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btfss STATUS,Z ;30 If high byte of length is not zero, length
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bcf FLAGS,TMPFLAG ;31 of frame is not 2
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call SendByte ;32-25
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movf UR_5TH,W ;26
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movwf LT_BUF ;27
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movwf LT_LENL ;28
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nop ;29
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DNOP ;30-31
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xorlw 2 ;29 If low byte of length is not 2, length of
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btfss STATUS,Z ;30 frame is not 2
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bcf FLAGS,TMPFLAG ;31 "
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call SendByte ;32-25
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DNOP ;26-27
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DNOP ;28-29
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DNOP ;30-31
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comf LT_CRC1,W ;26 If length of frame is 2, overstrike the
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btfsc FLAGS,TMPFLAG ;27 first byte to send with the first byte of
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movwf INDF1 ;28 the CRC and store the second for later
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comf LT_CRC2,W ;29 use; this takes care of the fact that we
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btfsc FLAGS,TMPFLAG ;30 won't have time to do it later
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movwf LT_BUF2 ;31 "
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call SendFromQueue ;32-25 (Branches into SendPostamble)
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movlb 7 ;Clear the inevitable IOC interrupt that came
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bcf IOCAF,IOCAF5 ; in while (and because) we were transmitting
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@ -1184,8 +1168,13 @@ SendFrL movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
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bsf LT_ONES,0 ;21 "
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btfsc LT_ONES,5 ;22 If the consecutive ones counter has reached
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call SendByteStuff ;23(-24) five, stuff a zero
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DELAY 3 ;24-32
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nop ;33
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movf INDF1,W ;24 Update LT_CRC1 with the byte being sent;
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xorwf LT_CRC1,W ;25 note that we don't movlp back to 0 because
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movwf LT_CRCX ;26 we don't have time; this only works
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movlp high CrcLut1 ;27 because CrcLut1 is below the page boundary
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callw ;28-31 "
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xorwf LT_CRC2,W ;32 "
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movwf LT_CRC1 ;33 "
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movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
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xorwf LATA,F ;00 Invert LocalTalk pin for clock
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call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
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@ -1198,8 +1187,12 @@ SendFrL movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
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bsf LT_ONES,0 ;21 "
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btfsc LT_ONES,5 ;22 If the consecutive ones counter has reached
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call SendByteStuff ;23(-24) five, stuff a zero
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DELAY 3 ;24-32
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nop ;33
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movf LT_CRCX,W ;24 Update LT_CRC2 with the byte being sent
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movlp high CrcLut2 ;25 "
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callw ;26-29 "
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movlp 0 ;30 "
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movwf LT_CRC2 ;31 "
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DNOP ;32-33
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movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
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xorwf LATA,F ;00 Invert LocalTalk pin for clock
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call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
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@ -1212,8 +1205,16 @@ SendFrL movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
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bsf LT_ONES,0 ;21 "
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btfsc LT_ONES,5 ;22 If the consecutive ones counter has reached
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call SendByteStuff ;23(-24) five, stuff a zero
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DELAY 3 ;24-32
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nop ;33
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bsf FLAGS,TMPFLAG ;24 If frame length is 2, we need to overwrite
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btfss FEATURES,CALCCRC;25 the CRC bytes with our calculated CRC; if
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bcf FLAGS,TMPFLAG ;26 the feature is off, never do this
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movf LT_LENH,W ;27 If the upper byte of the remaining byte
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btfss STATUS,Z ;28 counter is not zero, remaining byte
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bcf FLAGS,TMPFLAG ;29 counter is not 2
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movf LT_LENL,W ;30 If the lower byte of the remaining byte
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xorlw 2 ;31 counter is not 2, remaining byte counter
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btfss STATUS,Z ;32 is not 2; we will use this flag later
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bcf FLAGS,TMPFLAG ;33 "
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movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
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xorwf LATA,F ;00 Invert LocalTalk pin for clock
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call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
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@ -1226,8 +1227,16 @@ SendFrL movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
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bsf LT_ONES,0 ;21 "
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btfsc LT_ONES,5 ;22 If the consecutive ones counter has reached
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call SendByteStuff ;23(-24) five, stuff a zero
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DELAY 3 ;24-32
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nop ;33
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moviw FSR1++ ;24 Advance the receiver queue pop pointer
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bcf FSR1L,7 ;25 "
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comf LT_CRC1,W ;26 If the remaining byte counter is at 2, set
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btfsc FLAGS,TMPFLAG ;27 the next byte to be sent to the first byte
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movwf INDF1 ;28 of the CRC and store the second byte of
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comf LT_CRC2,W ;29 the CRC to be sent later (when the
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btfsc FLAGS,TMPFLAG ;30 remaining byte counter is at 1)
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movwf LT_BUF2 ;31 "
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decf FSR1L,F ;32 Regress the receiver queue pop pointer
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bcf FSR1L,7 ;33 "
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movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
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xorwf LATA,F ;00 Invert LocalTalk pin for clock
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call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
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@ -1240,8 +1249,16 @@ SendFrL movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
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bsf LT_ONES,0 ;21 "
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btfsc LT_ONES,5 ;22 If the consecutive ones counter has reached
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call SendByteStuff ;23(-24) five, stuff a zero
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DELAY 3 ;24-32
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nop ;33
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bsf FLAGS,TMPFLAG ;24 If frame length is 2, we need to overwrite
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btfss FEATURES,CALCCRC;25 the CRC bytes with our calculated CRC; if
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bcf FLAGS,TMPFLAG ;26 the feature is off, never do this
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movf LT_LENH,W ;27 If the upper byte of the remaining byte
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btfss STATUS,Z ;28 counter is not zero, remaining byte
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bcf FLAGS,TMPFLAG ;29 counter is not 1
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movf LT_LENL,W ;30 If the lower byte of the remaining byte
|
||||
xorlw 1 ;31 counter is not 1, remaining byte counter
|
||||
btfss STATUS,Z ;32 is not 1; we will use this flag later
|
||||
bcf FLAGS,TMPFLAG ;33 "
|
||||
movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
|
||||
xorwf LATA,F ;00 Invert LocalTalk pin for clock
|
||||
call SendDoUartSvc ;01-02 (03-14) Service the UART receiver
|
||||
|
|
@ -1254,7 +1271,14 @@ SendFrL movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
|
|||
bsf LT_ONES,0 ;21 "
|
||||
btfsc LT_ONES,5 ;22 If the consecutive ones counter has reached
|
||||
call SendByteStuff ;23(-24) five, stuff a zero
|
||||
DELAY 3 ;24-32
|
||||
moviw FSR1++ ;24 Advance the receiver queue pop pointer
|
||||
bcf FSR1L,7 ;25 "
|
||||
movf LT_BUF2,W ;26 If the remaining byte counter is at 1, set
|
||||
btfsc FLAGS,TMPFLAG ;27 the next byte to be sent to the second
|
||||
movwf INDF1 ;28 byte of the CRC that we saved earlier
|
||||
decf FSR1L,F ;29 Regress the receiver queue pop pointer
|
||||
bcf FSR1L,7 ;30 "
|
||||
DNOP ;31-32
|
||||
nop ;33
|
||||
movlw B'00100000' ;34 Load pattern for inverting LocalTalk pin
|
||||
xorwf LATA,F ;00 Invert LocalTalk pin for clock
|
||||
|
|
@ -1375,7 +1399,7 @@ SendDoUartCts
|
|||
|
||||
;;; CRC Lookup Tables ;;;
|
||||
|
||||
org 0x700
|
||||
org 0x600
|
||||
|
||||
CrcLut1
|
||||
dt 0x00,0x89,0x12,0x9B,0x24,0xAD,0x36,0xBF
|
||||
|
|
@ -1412,7 +1436,7 @@ CrcLut1
|
|||
dt 0xC7,0x4E,0xD5,0x5C,0xE3,0x6A,0xF1,0x78
|
||||
|
||||
|
||||
org 0x800
|
||||
org 0x700
|
||||
|
||||
CrcLut2
|
||||
dt 0x00,0x11,0x23,0x32,0x46,0x57,0x65,0x74
|
||||
|
|
@ -1459,7 +1483,7 @@ CrcLut2
|
|||
; \________________/
|
||||
; Time period when we should be checking for a clock-inversion
|
||||
|
||||
org 0x900
|
||||
org 0x800
|
||||
|
||||
OutNothingSkip
|
||||
movlw B'00001111' ;16 If the UART receiver queue length >= 64,
|
||||
|
|
@ -1607,6 +1631,33 @@ InCheckInv
|
|||
bra InReceive ;43 "
|
||||
bra InLostClock ;By this point, we must assume we've lost clock
|
||||
|
||||
InSecond
|
||||
movf LR_BUF2,W ;12 Update the CRC with the last byte received
|
||||
xorwf LR_CCRC1,W ;13 "
|
||||
movlp high CrcLut1 ;14 "
|
||||
callw ;15-18 "
|
||||
movwf D0 ;19 "
|
||||
bra InCheckInv ;20-21
|
||||
|
||||
InFourth
|
||||
movf LR_BUF2,W ;12 Update the CRC with the last byte received
|
||||
movwi FSR1++ ;13 "
|
||||
xorwf LR_CCRC1,W ;14 "
|
||||
movwf D1 ;15 "
|
||||
movf D0,W ;16 "
|
||||
xorwf LR_CCRC2,W ;17 "
|
||||
movwf LR_CCRC1 ;18 "
|
||||
nop ;19
|
||||
bra InCheckInv ;20-21
|
||||
|
||||
InSixth
|
||||
movf D1,W ;12 Update the CRC with the last byte received
|
||||
movlp high CrcLut2 ;13 "
|
||||
callw ;14-17 "
|
||||
movwf LR_CCRC2 ;18 "
|
||||
nop ;19
|
||||
bra InCheckInv ;20-21
|
||||
|
||||
OutReceive
|
||||
bcf IOCAF,IOCAF5 ;00 Ready to detect inversion
|
||||
movlp high OutFSA ;01 Point PCLATH to the out-of-frame FSA for 0
|
||||
|
|
@ -1632,19 +1683,80 @@ InReceive
|
|||
movwf PCL ;05-06 "
|
||||
|
||||
InFlag
|
||||
movlb 3 ;12 Transmit a zero, which is an escape
|
||||
clrf TXREG ;13 character
|
||||
movlw 0xFD ;14 Transmit 0xFD, which signifies 'Frame Done'
|
||||
movwf TXREG ;15 "
|
||||
movlb 7 ;16 "
|
||||
bsf FLAGS,LR_FRM ;17 Raise the flag that frame regs have changed
|
||||
DNOP ;18-19
|
||||
bra OutCheckInv ;20-21 Switch to out-of-frame inversion check
|
||||
bsf FLAGS,LR_CROK ;12 If the whole frame and a correct CRC have
|
||||
movf LR_CCRC1,W ;13 been fed through the CRC calculator, the
|
||||
xorlw 0xB8 ;14 registers should be 0xB8 and 0xF0; set
|
||||
btfss STATUS,Z ;15 flag if this is the case and clear it
|
||||
bcf FLAGS,LR_CROK ;16 otherwise
|
||||
movf LR_CCRC2,W ;17 "
|
||||
xorlw 0xF0 ;18 "
|
||||
btfss STATUS,Z ;19 "
|
||||
bcf FLAGS,LR_CROK ;20 "
|
||||
movlw 0xFC ;21 Compute the correct status to send - if the
|
||||
btfss FLAGS,LR_CROK ;22 CRC is wrong and CRC checking is enabled,
|
||||
btfss FEATURES,CHKCRC ;23 this should be 0xFC (frame check failed),
|
||||
movlw 0xFD ;24 otherwise it should be 0xFD (frame done)
|
||||
movlb 3 ;25 Transmit a zero, which is an escape
|
||||
clrf TXREG ;26 character
|
||||
movwf TXREG ;27 Send the byte computed above
|
||||
movlb 7 ;28 "
|
||||
bsf FLAGS,LR_FRM ;29 Raise the flag that frame regs have changed
|
||||
InFlag2 bcf IOCAF,IOCAF5 ;Ready to detect inversion
|
||||
movlb 0 ;00 Check if there is a byte waiting from the
|
||||
bcf STATUS,C ;01 UART
|
||||
btfsc PIR1,RCIF ;02 "
|
||||
bsf STATUS,C ;03 "
|
||||
movlb 3 ;04 If there is a byte waiting from the UART,
|
||||
btfsc STATUS,C ;05 push it onto the queue
|
||||
movf RCREG,W ;06 "
|
||||
movlb 0 ;07 "
|
||||
btfsc STATUS,C ;08 "
|
||||
movwi FSR0++ ;09 "
|
||||
bcf FSR0L,7 ;10 Wrap the queue around
|
||||
btfsc STATUS,C ;11 If there was a byte waiting from the UART,
|
||||
incf UR_LEN,F ;12 increment the queue length
|
||||
movlw B'00001111' ;13 If the UART receiver queue length >= 64,
|
||||
btfsc UR_LEN,6 ;14 deassert CTS so the host stops sending us
|
||||
movwf PORTA ;15 data
|
||||
bcf STATUS,C ;16 Check if there is a byte waiting from the
|
||||
btfsc PIR1,RCIF ;17 UART
|
||||
bsf STATUS,C ;18 "
|
||||
movlb 3 ;19 If there is a byte waiting from the UART,
|
||||
btfsc STATUS,C ;20 push it onto the queue
|
||||
movf RCREG,W ;21 "
|
||||
movlb 0 ;22 "
|
||||
btfsc STATUS,C ;23 "
|
||||
movwi FSR0++ ;24 "
|
||||
bcf FSR0L,7 ;25 Wrap the queue around
|
||||
btfsc STATUS,C ;26 If there was a byte waiting from the UART,
|
||||
incf UR_LEN,F ;27 increment the queue length
|
||||
movlw B'00001111' ;28 If the UART receiver queue length >= 64,
|
||||
btfsc UR_LEN,6 ;29 deassert CTS so the host stops sending us
|
||||
movwf PORTA ;30 data
|
||||
bcf STATUS,C ;31 Check if there is a byte waiting from the
|
||||
btfsc PIR1,RCIF ;32 UART
|
||||
bsf STATUS,C ;33 "
|
||||
movlb 3 ;34 If there is a byte waiting from the UART,
|
||||
btfsc STATUS,C ;35 push it onto the queue
|
||||
movf RCREG,W ;36 "
|
||||
movlb 0 ;37 "
|
||||
btfsc STATUS,C ;38 "
|
||||
movwi FSR0++ ;39 "
|
||||
bcf FSR0L,7 ;40 Wrap the queue around
|
||||
btfsc STATUS,C ;41 If there was a byte waiting from the UART,
|
||||
incf UR_LEN,F ;42 increment the queue length
|
||||
movlw B'00001111' ;43 If the UART receiver queue length >= 64,
|
||||
btfsc UR_LEN,6 ;44 deassert CTS so the host stops sending us
|
||||
movwf PORTA ;45 data
|
||||
movlb 7 ;If there's been an inversion in the elapsed
|
||||
btfsc IOCAF,IOCAF5 ; ~1.25 bit times, the line is not yet idle and
|
||||
bra InFlag2 ; we should try again
|
||||
bra FinishUp ;Else, proceed to finish the receive
|
||||
|
||||
EmpByte
|
||||
InByte
|
||||
movf LR_BUF,W ;12 Save the received byte into the frame regs
|
||||
movwi FSR1++ ;13 using FSR1
|
||||
movf LR_BUF,W ;12 Save received byte into second buffer so it
|
||||
movwf LR_BUF2 ;13 can be CRC'd and copied into the frame regs
|
||||
btfss STATUS,Z ;14 If the received byte is not a zero, just
|
||||
bra InByte2 ;15(-16) transmit it as-is
|
||||
movlb 3 ;16 If the received byte is a zero, transmit
|
||||
|
|
@ -1714,7 +1826,22 @@ InFErr
|
|||
clrf TXREG ; "
|
||||
movlw 0xFE ;Transmit 0xFE, which signifies 'Frame Error'
|
||||
movwf TXREG ; "
|
||||
bra FinishUp
|
||||
;fall through
|
||||
|
||||
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
|
||||
decf LR_CCRC1,F ; don't have time to do this when we jump into
|
||||
clrf LR_CCRC2 ; the receiver
|
||||
decf LR_CCRC2,F ; "
|
||||
movf FSR0L,W ;Store the changed UART receiver push point
|
||||
movlb 31 ; back in its shadow register so it stays the
|
||||
movwf FSR0L_SHAD ; same when we return from interrupt
|
||||
retfie
|
||||
|
||||
InLostClock
|
||||
movlb 0 ;Wait until the UART transmitter is ready for
|
||||
|
|
@ -1730,17 +1857,6 @@ InLostClock
|
|||
movwf TXREG ; "
|
||||
bra FinishUp
|
||||
|
||||
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
|
||||
movf FSR0L,W ;Store the changed UART receiver push point
|
||||
movlb 31 ; back in its shadow register so it stays the
|
||||
movwf FSR0L_SHAD ; same when we return from interrupt
|
||||
retfie
|
||||
|
||||
|
||||
;;; LocalTalk Receiver State Machines ;;;
|
||||
|
||||
|
|
@ -2569,7 +2685,7 @@ Is0c0r0 bcf LR_BUF,0 ;07
|
|||
Is0c1r0 bcf LR_BUF,1 ;07
|
||||
movlw low Is0c2r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is0c2r0 bcf LR_BUF,2 ;07
|
||||
movlw low Is0c3r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2577,7 +2693,7 @@ Is0c2r0 bcf LR_BUF,2 ;07
|
|||
Is0c3r0 bcf LR_BUF,3 ;07
|
||||
movlw low Is0c4r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is0c4r0 bcf LR_BUF,4 ;07
|
||||
movlw low Is0c5r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2585,7 +2701,7 @@ Is0c4r0 bcf LR_BUF,4 ;07
|
|||
Is0c5r0 bcf LR_BUF,5 ;07
|
||||
movlw low Is0c6r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is0c6r0 bcf LR_BUF,6 ;07
|
||||
movlw low Is0c7r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2601,7 +2717,7 @@ Is1c0r0 bcf LR_BUF,0 ;07
|
|||
Is1c1r0 bcf LR_BUF,1 ;07
|
||||
movlw low Is0c2r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is1c2r0 bcf LR_BUF,2 ;07
|
||||
movlw low Is0c3r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2609,7 +2725,7 @@ Is1c2r0 bcf LR_BUF,2 ;07
|
|||
Is1c3r0 bcf LR_BUF,3 ;07
|
||||
movlw low Is0c4r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is1c4r0 bcf LR_BUF,4 ;07
|
||||
movlw low Is0c5r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2617,7 +2733,7 @@ Is1c4r0 bcf LR_BUF,4 ;07
|
|||
Is1c5r0 bcf LR_BUF,5 ;07
|
||||
movlw low Is0c6r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is1c6r0 bcf LR_BUF,6 ;07
|
||||
movlw low Is0c7r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2633,7 +2749,7 @@ Is2c0r0 bcf LR_BUF,0 ;07
|
|||
Is2c1r0 bcf LR_BUF,1 ;07
|
||||
movlw low Is0c2r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is2c2r0 bcf LR_BUF,2 ;07
|
||||
movlw low Is0c3r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2641,7 +2757,7 @@ Is2c2r0 bcf LR_BUF,2 ;07
|
|||
Is2c3r0 bcf LR_BUF,3 ;07
|
||||
movlw low Is0c4r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is2c4r0 bcf LR_BUF,4 ;07
|
||||
movlw low Is0c5r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2649,7 +2765,7 @@ Is2c4r0 bcf LR_BUF,4 ;07
|
|||
Is2c5r0 bcf LR_BUF,5 ;07
|
||||
movlw low Is0c6r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is2c6r0 bcf LR_BUF,6 ;07
|
||||
movlw low Is0c7r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2665,7 +2781,7 @@ Is3c0r0 bcf LR_BUF,0 ;07
|
|||
Is3c1r0 bcf LR_BUF,1 ;07
|
||||
movlw low Is0c2r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is3c2r0 bcf LR_BUF,2 ;07
|
||||
movlw low Is0c3r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2673,7 +2789,7 @@ Is3c2r0 bcf LR_BUF,2 ;07
|
|||
Is3c3r0 bcf LR_BUF,3 ;07
|
||||
movlw low Is0c4r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is3c4r0 bcf LR_BUF,4 ;07
|
||||
movlw low Is0c5r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2681,7 +2797,7 @@ Is3c4r0 bcf LR_BUF,4 ;07
|
|||
Is3c5r0 bcf LR_BUF,5 ;07
|
||||
movlw low Is0c6r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is3c6r0 bcf LR_BUF,6 ;07
|
||||
movlw low Is0c7r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2697,7 +2813,7 @@ Is4c0r0 bcf LR_BUF,0 ;07
|
|||
Is4c1r0 bcf LR_BUF,1 ;07
|
||||
movlw low Is0c2r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is4c2r0 bcf LR_BUF,2 ;07
|
||||
movlw low Is0c3r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2705,7 +2821,7 @@ Is4c2r0 bcf LR_BUF,2 ;07
|
|||
Is4c3r0 bcf LR_BUF,3 ;07
|
||||
movlw low Is0c4r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is4c4r0 bcf LR_BUF,4 ;07
|
||||
movlw low Is0c5r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2713,7 +2829,7 @@ Is4c4r0 bcf LR_BUF,4 ;07
|
|||
Is4c5r0 bcf LR_BUF,5 ;07
|
||||
movlw low Is0c6r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is4c6r0 bcf LR_BUF,6 ;07
|
||||
movlw low Is0c7r0 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2772,7 +2888,7 @@ Is0c0r1 bsf LR_BUF,0 ;07
|
|||
Is0c1r1 bsf LR_BUF,1 ;07
|
||||
movlw low Is1c2r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is0c2r1 bsf LR_BUF,2 ;07
|
||||
movlw low Is1c3r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2780,7 +2896,7 @@ Is0c2r1 bsf LR_BUF,2 ;07
|
|||
Is0c3r1 bsf LR_BUF,3 ;07
|
||||
movlw low Is1c4r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is0c4r1 bsf LR_BUF,4 ;07
|
||||
movlw low Is1c5r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2788,7 +2904,7 @@ Is0c4r1 bsf LR_BUF,4 ;07
|
|||
Is0c5r1 bsf LR_BUF,5 ;07
|
||||
movlw low Is1c6r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is0c6r1 bsf LR_BUF,6 ;07
|
||||
movlw low Is1c7r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2804,7 +2920,7 @@ Is1c0r1 bsf LR_BUF,0 ;07
|
|||
Is1c1r1 bsf LR_BUF,1 ;07
|
||||
movlw low Is2c2r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is1c2r1 bsf LR_BUF,2 ;07
|
||||
movlw low Is2c3r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2812,7 +2928,7 @@ Is1c2r1 bsf LR_BUF,2 ;07
|
|||
Is1c3r1 bsf LR_BUF,3 ;07
|
||||
movlw low Is2c4r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is1c4r1 bsf LR_BUF,4 ;07
|
||||
movlw low Is2c5r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2820,7 +2936,7 @@ Is1c4r1 bsf LR_BUF,4 ;07
|
|||
Is1c5r1 bsf LR_BUF,5 ;07
|
||||
movlw low Is2c6r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is1c6r1 bsf LR_BUF,6 ;07
|
||||
movlw low Is2c7r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2836,7 +2952,7 @@ Is2c0r1 bsf LR_BUF,0 ;07
|
|||
Is2c1r1 bsf LR_BUF,1 ;07
|
||||
movlw low Is3c2r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is2c2r1 bsf LR_BUF,2 ;07
|
||||
movlw low Is3c3r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2844,7 +2960,7 @@ Is2c2r1 bsf LR_BUF,2 ;07
|
|||
Is2c3r1 bsf LR_BUF,3 ;07
|
||||
movlw low Is3c4r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is2c4r1 bsf LR_BUF,4 ;07
|
||||
movlw low Is3c5r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2852,7 +2968,7 @@ Is2c4r1 bsf LR_BUF,4 ;07
|
|||
Is2c5r1 bsf LR_BUF,5 ;07
|
||||
movlw low Is3c6r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is2c6r1 bsf LR_BUF,6 ;07
|
||||
movlw low Is3c7r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2868,7 +2984,7 @@ Is3c0r1 bsf LR_BUF,0 ;07
|
|||
Is3c1r1 bsf LR_BUF,1 ;07
|
||||
movlw low Is4c2r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is3c2r1 bsf LR_BUF,2 ;07
|
||||
movlw low Is4c3r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2876,7 +2992,7 @@ Is3c2r1 bsf LR_BUF,2 ;07
|
|||
Is3c3r1 bsf LR_BUF,3 ;07
|
||||
movlw low Is4c4r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is3c4r1 bsf LR_BUF,4 ;07
|
||||
movlw low Is4c5r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2884,7 +3000,7 @@ Is3c4r1 bsf LR_BUF,4 ;07
|
|||
Is3c5r1 bsf LR_BUF,5 ;07
|
||||
movlw low Is4c6r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is3c6r1 bsf LR_BUF,6 ;07
|
||||
movlw low Is4c7r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2900,7 +3016,7 @@ Is4c0r1 bsf LR_BUF,0 ;07
|
|||
Is4c1r1 bsf LR_BUF,1 ;07
|
||||
movlw low Is5c2r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSecond ;10-11
|
||||
Is4c2r1 bsf LR_BUF,2 ;07
|
||||
movlw low Is5c3r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2908,7 +3024,7 @@ Is4c2r1 bsf LR_BUF,2 ;07
|
|||
Is4c3r1 bsf LR_BUF,3 ;07
|
||||
movlw low Is5c4r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InFourth ;10-11
|
||||
Is4c4r1 bsf LR_BUF,4 ;07
|
||||
movlw low Is5c5r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
@ -2916,7 +3032,7 @@ Is4c4r1 bsf LR_BUF,4 ;07
|
|||
Is4c5r1 bsf LR_BUF,5 ;07
|
||||
movlw low Is5c6r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
goto InNothing ;10-11
|
||||
goto InSixth ;10-11
|
||||
Is4c6r1 bsf LR_BUF,6 ;07
|
||||
movlw low Is5c7r1 ;08
|
||||
movwf LR_STATE ;09
|
||||
|
|
|
|||
Loading…
Reference in New Issue