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

Remember that SX/B is "simpler" than PBASIC, even it if it is syntactically similar -- and with that simplicity comes the power to do what you want.  You could always create a WAITFOR subroutine:
 

WAITFOR:

  temp1 = __PARAM1

  DO

    SERIN Sin, Baud, temp2

  LOOP UNTIL temp2 = temp1

  RETURN

 

In your application you can:

 

  WAITFOR "C"

 

Now, if you are expecting things to arrive within a given window, you could do something like this that would cause WAITFOR to return a success code if it worked:

 

WAITFOR:
  temp1 = __PARAM1
  DO
    SERIN Sin, Baud, temp2, 20, NO_RX

  LOOP UNTIL temp2 = temp1

  temp1 = 0

  GOTO WAITFOR_EXIT

NO_RX:

  temp1 = $FF   

 

WAITFOR_EXIT
  RETURN temp1               


One thing I did notice is that you don't update your buffer pointer after receiving a byte.  Perhaps you should add "INC ax" afer you move bx into the buffer.

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