Multiple IF-THEN statements

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  1. - 19th June 2007, 09:56 #1
    DavidK's Avatar
    DavidK
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    Default Multiple IF-THEN statements

    I know it is late and maybe that is the problem. I am trying to run multiple IF-THEN statements. Individually they work fine, but combining them does not. The combined statements assemble fine. BTW, I am reading a clock chip and after every minute rollover, I cycle a cooling fan approx 7 seconds at the 0 second point and 30 second point. I may have to adjust this time (or increase the number of cycles) so I want to be flexible. Where am I missing it?

    IF (rtcsec >= $00) AND (rtcsec <= $07) THEN
    portb.7 = 1
    IF (rtcsec >= $30) AND (rtcsec <= $37) THEN
    portb.7 = 1
    ELSE
    portb.7 = 0
    ENDIF
    ENDIF
  2. - 19th June 2007, 10:10 #2
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    try this;

    Code:
    IF rtcsec <= $07 OR (rtcsec >= $30 AND rtcsec <= $37) THEN
   portb.7 = 1
ELSE
   portb.7 = 0
ENDIF

    -----------------------------
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
  3. - 19th June 2007, 10:36 #3
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    Smile

    Quote Originally Posted by DavidK View Post
    I know it is late and maybe that is the problem. I am trying to run multiple IF-THEN statements. Individually they work fine, but combining them does not. The combined statements assemble fine. BTW, I am reading a clock chip and after every minute rollover, I cycle a cooling fan approx 7 seconds at the 0 second point and 30 second point. I may have to adjust this time (or increase the number of cycles) so I want to be flexible. Where am I missing it?

    IF (rtcsec >= $00) AND (rtcsec <= $07) THEN
    portb.7 = 1
    IF (rtcsec >= $30) AND (rtcsec <= $37) THEN
    portb.7 = 1
    ELSE
    portb.7 = 0
    ENDIF
    ENDIF
    Here is why yours did not work - all I did was format your IF-Thens

    Code:
    IF (rtcsec >= $00) AND (rtcsec <= $07) THEN
	portb.7 = 1
	IF (rtcsec >= $30) AND (rtcsec <= $37) THEN 
		portb.7 = 1
	ELSE
		portb.7 = 0
	ENDIF
ENDIF
    As you can see in order for the code to reach your between 30-37 check, the first condition must be true (between 0-7) - go with Jerson's version or two separate checks like you said you had working.
    Paul Borgmeier
    Salt Lake City, UT
    USA
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  4. - 19th June 2007, 11:27 #4
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    Quote Originally Posted by paul borgmeier
    .... - go with Jerson's version ...
    Who is Jerson ?


    --------------
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
  5. - 19th June 2007, 12:40 #5
    Acetronics2's Avatar
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    Post one test only version ...

    Hi,

    May be we could simplify ...

    RTCSEC is ALWAYS >= 0 with PbP ... huh ...


    IF ( RTCSEC & $F0) = 0 or 3 ... AND
    IF RTCSEC & $0F < 8 ... PortB.7 = 1

    Else Portb.7 = 0

    so,

    IF (( rtcsec & $F0 = 0 ) OR (rtcsec & $F0 = $30 )) AND ( rtcsec & $0F < 8 ) THEN
    PORTB.7 = 1
    ELSE
    PORTB.7 = 0
    ENDIF

    ...


    Alain

    PS: Hi Sayzer ... you've also got one point !!!
    Last edited by Acetronics2; - 19th June 2007 at 12:52.
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************
  6. - 19th June 2007, 17:25 #6
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    Red face

    Quote Originally Posted by sayzer View Post
    Who is Jerson ?


    --------------
    MY apologies - Please substitute Sayzer for Jerson. That is what staying up to 4AM gets me. Jerson regularly contributes and for some reason, I mixed you up when I was writing my reply? (I hope neither of you are offended by that - if you are, next time either of you are in SLC, UT, I will by you a beer or a beverage of your choice).

    Paul
    Last edited by paul borgmeier; - 19th June 2007 at 17:27.
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  7. - 20th June 2007, 05:45 #7
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    Who is Jerson ?
    Hey, that's me. No offence taken Paul. I am in a way lucky to be entitled to one of your free beers/beverages. Thanks.

    Jerson
    Embedded Systems Designer
    http://jerson.co.in
  8. - 20th June 2007, 10:37 #8
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    Quote Originally Posted by paul borgmeier View Post
    ...Please substitute Sayzer for Jerson. ...

    Paul
    Which one is correct ?

    "Please substitute Sayzer for Jerson" OR "Please substitute Jerson for Sayzer ".


    I am confused a little there.

    Is it something with my English or my understanding?

    P.S. - Not offended of any kind...
    --------------------
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
  9. - 20th June 2007, 18:09 #9
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    IF A=B... will B=A ?
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  10. - 19th June 2007, 15:38 #10
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    Talking

    WOW !! That simple. I was real foggy last night. Tried the code suggestion and it works perfect. Now hopefully I can get by with just two cooling’s otherwise I have to install a temperature sensor, wich I might do anyway. Fans make noise.

    Thanks everyone for your help and explanations
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