semaphore pic12f629

[Darrel Taylor]

Well, ok.

But I accept no responsibility for the resulting accidents.

@ device  INTOSCIO, WDT_OFF, PWRT_OFF, MCLR_OFF, PROTECT_OFF, CPD_OFF 
DEFINE OSCCAL_1K 1

Green         CON 5000             ; mS to show Green Light
Yellow        CON 1000             ; mS to show Yellow Light
Tcalibrate    CON 480              ; Adjust for loop timing accuracy
;---------------------
Sequence      VAR BYTE             ; cycles through the 4 states
TimeCount     VAR WORD             ; Counts down sequence time

CMCON = 7                          ; Disable comparator
GPIO   = %110000                   ; Start with all LED's off
TRISIO = %001000                   ; Set LED ports to output

;---------------------------------------------------------------------------
Main:
  FOR Sequence = 0 to 3
    LOOKUP2 Sequence,[ Green,  Yellow,  Green,  Yellow], TimeCount
    REPEAT                                                   ; Multiplex
      LOOKUP Sequence,[%100001,%100011,%100100,%100100],GPIO ;  Tr. Light #1
      PauseUS Tcalibrate
      LOOKUP Sequence,[%010100,%010100,%010001,%010011],GPIO ;  Tr. Light #2
      PauseUS Tcalibrate
      TimeCount = TimeCount - 1
    UNTIL TimeCount = 0
  NEXT  Sequence
GOTO Main