In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

That did it for me:

[code]
' -------------------------------------------------
' Subroutine / Function Code
' ------------------------------------------------- 

' Use: aByte = RX_BYTE
' -- returns "aByte" from 8-byte circular buffer
' -- will wait if buffer is presently empty
' -- rxBufCnt holds byte count of receive buffer (0 to 8) 

FUNC RX_BYTE
  ASM
    BANK  rxSerial
    TEST  rxBufCnt    ' check buffer count
    JZ    @RX_BYTE    ' wait if empty
    MOV   W, #rxBuf    ' point to tail
    ADD   W, rxTail
    MOV   FSR, W
    MOV   __PARAM1, IND    ' get byte at tail
    INC   rxTail    ' update tail
    CLRB  rxTail.3    ' keep 0 to 7    
    DEC   rxBufCnt    ' update buffer count
    BANK  0
  ENDASM
  [b]RETURN __PARAM1[/b]
  ENDFUNC 
[/code]

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