TIM4 INT with pindebug

TIM4 INT with pindebug

_TIM4_IRQHandler:
        ; patch test - turn on 1's digit
        BSET PB_ODR,#0
        ; end patch test

        ; TIM4 interrupt handler for software Rx/Tx
        BRES    TIM4_SR,#0      ; clear TIM4 UIF

        LD      A,TIM4RCNT      ; test receive step counter
        JREQ    TIM4_TESTTRANS  ; nothing to do - check for transmit

        ; Receive a bit
        BTJT    PSIM+IDR,#PNRX,1$ ; dummy branch, copy GPIO to CF

        ; old 1 line - patch
; 1$:     RRC     TIM4RXREG

        ; new 2 lines - patch
        ; this PC5 mirror works on both A and V display outputs
1$:     bccm    PC_ODR,#5       ; pindebug: mirror bit to 1000's digit p1 on LED
        RRC     TIM4RXREG

        DEC     TIM4RCNT
        JRNE    TIM4_TESTTRANS

        ; Receive sequence complete
        MOV     TIM4RXBUF,TIM4RXREG ; save result
        BSET    PSIM+CR2,#PNRX  ; enable PNRX external interrupt

        ; patch
        MOV     TSTAMP  ,TIM2_CNTRH
        MOV     TSTAMP+1,TIM2_CNTRL
        ; end patch

        ; patch test - turn off 1's digit
        BRES PB_ODR,#0
        ; end patch test

        ; fall through