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

Hello.  
 

I want to monitor two pins.

 

When the two pins are dissimilar, then I want to increase a counter by 1.

 

Here is my code.  It won't compile.  The error message says "unknown command LET".  What is this?

 

' =========================================================================
'
'   File......
'   Purpose...
'   Author.... 
'   E-mail.... 
'   Started...
'   Updated...
'
' =========================================================================


' -------------------------------------------------------------------------
' Program Description
' -------------------------------------------------------------------------


' -------------------------------------------------------------------------
' Conditional Compilation Symbols
' -------------------------------------------------------------------------


' -------------------------------------------------------------------------
' Device Settings
' -------------------------------------------------------------------------

DEVICE          SX28, OSC4MHZ, TURBO, STACKX, OPTIONX, BOR42
FREQ            4_000_000


' -------------------------------------------------------------------------
' I/O Pins
' -------------------------------------------------------------------------

Pin1 PIN RA.0 INPUT
Pin2 PIN RA.2 INPUT

' -------------------------------------------------------------------------
' Constants
' -------------------------------------------------------------------------


' -------------------------------------------------------------------------
' Variables
' -------------------------------------------------------------------------

 a VAR bit
 b VAR bit
 cc VAR bit

' =========================================================================
' INTERRUPT
' =========================================================================
'ISR_Start:
  ' ISR code here

'ISR_Exit:
  'RETURNINT ' {cycles}                                 

 

' =========================================================================
  PROGRAM Start
' =========================================================================


' -------------------------------------------------------------------------
' Subroutine / Function Declarations
' -------------------------------------------------------------------------


' -------------------------------------------------------------------------
' Program Code
' -------------------------------------------------------------------------

Start:

  a = Pin1 
  b = Pin2
  
  cc = a ^ b
  IF cc = 1 THEN
    counter = counter + 1
  ENDIF

Main:

  GOTO Main


' -------------------------------------------------------------------------
' Subroutine / Function Code
' -------------------------------------------------------------------------


' -------------------------------------------------------------------------


' -------------------------------------------------------------------------
' User Data
' -------------------------------------------------------------------------

---------- End of Message ----------


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