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Implemented mark and space checks.

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This commit is contained in:
Alex Thissen 2024-02-09 12:54:00 +00:00
parent 014f85f226
commit 65bce9ecde
1 changed files with 12 additions and 2 deletions
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14
libsrc/lynx/ser/lynx-comlynx.s
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@ -151,7 +151,7 @@ SER_OPEN:
cmp #SER_BAUD_600
beq setbaudrate
; Source period is 4 us
; Source period is 8 us
ldy #%00011011 ; ENABLE_RELOAD|ENABLE_COUNT|AUD_8
ldx #51
@ -341,8 +341,9 @@ SER_IRQ:
ldx SERDAT ; Read received data
lda contrl
and #PAREN ; Parity enabled implies SER_PAR_EVEN or SER_PAR_ODD
tay
ora #OVERRUN|FRAMERR|RXBRK
bit SERCTL ; Compare with SERCTL
bit SERCTL ; Check error flags in SERCTL
beq @rx_irq ; No errors so far
@ -358,6 +359,15 @@ SER_IRQ:
bra @exit0
@rx_irq:
tya
bne @2 ; Parity was enabled so no marker bit check needed
lda contrl
eor SERCTL ; Should match current parity bit
and #PARBIT ; Check for mark or space value
bne @exit0
@2:
txa
ldx RxPtrIn
sta RxBuffer,x