Scanner/energy row: UpdateScanner

       Name: UpdateScanner                                           [Show more]
       Type: Subroutine
   Category: Scanner/energy row
    Summary: Update the scanner, if required
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * IRQHandler calls UpdateScanner


.UpdateScanner

 LDA scannerUpdate      \ If scannerUpdate is non-zero then the scanner is
 BNE UpdateScannerNow   \ configured to update, so jump to UpdateScannerNow to
                        \ do just that, returning from the subroutine using a
                        \ tail call

 CMP lastScannerState   \ If the scanner state has not changed since the last
 BEQ scan6              \ time we updated the scanner, jump to scan6 to return
                        \ from the subroutine without updating the scanner

                        \ Otherwise fall through into UpdateScannerNow to update
                        \ the scanner