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

Here is what i am attempting....

I am wanting to have a set of 7 segment displays to show my current RPM on my car.  I am using an RPM function that i found on here and now I am trying to get it to show the RPM on the displays.  Everything works except there is a VERY noticeable flicker on the displays.  Can anyone help me on how to remove this flicker?

[code]
RPM_signal      PIN 	RC.0
TRIS_disp       VAR     TRIS_B
rpm          	VAR 	WORD
pWidth0       	VAR 	WORD
pWidth1       	VAR 	WORD
dividendMSW   	VAR 	WORD
dividendLSW   	VAR 	WORD
overflow      	VAR 	BIT
doneBit       	VAR 	BIT
display         VAR     RB
digit		VAR	WORD
digit1		VAR	WORD
b1              VAR     WORD
PROGRAM Start

PUT_DIGIT       SUB     2
getrpm		FUNC	3, 0

Start:
  TRIS_disp = %00000000

Main:
    rpm = getrpm
    display = PUT_DIGIT rpm
    GOTO Main

PUT_DIGIT:
  b1 = __WPARAM12
  LOW RA.1
  digit1 = b1 / 10
  digit = __REMAINDER
  READ SegMap + digit, display
  pause 5
  HIGH RA.1
  LOW RA.2
  digit1 = digit1 / 10
  digit = __REMAINDER
  READ SegMap + digit, display
  pause 5
  HIGH RA.2
  LOW RA.3
  digit1 = digit1 / 10
  digit = __REMAINDER
  READ SegMap + digit, display
  pause 5
  HIGH RA.3
  RETURN

getrpm:
    PULSIN RPM_signal, 0, pWidth0
    PULSIN RPM_signal, 1, pWidth1
    pWidth0 = pWidth0 + pWidth1
    dividendMSW = $005B
    dividendLSW = $8D80
    rpm = 1
    overflow = 0  
    DO
      doneBit = rpm.15
      rpm = rpm << 1
      IF overflow = 1 THEN
        rpm.0 = 1
        dividendMSW = dividendMSW - pWidth0
      ELSE
        IF dividendMSW >= pWidth0 THEN
          rpm.0 = 1
          dividendMSW = dividendMSW - pWidth0
        ENDIF
      ENDIF
      overflow = dividendMSW.15
      dividendMSW = dividendMSW << 1
      dividendMSW.0 = dividendLSW.15
      dividendLSW = dividendLSW << 1
    LOOP UNTIL doneBit = 1
    rpm = rpm << 1
    rpm.0 = overflow
    IF dividendMSW >= pWidth0 THEN
      rpm.0 = 1
    ENDIF
    RETURN rpm
    ENDFUNC
[/code]

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