How to set a pin high an keep it there?

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  1. - 27th September 2009, 05:10 #1
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    Default How to set a pin high an keep it there?

    Utter newbie here... I have three different LEDs on a PIC16F688. Here is my code:
    Code:
    symbol  GREEN = PORTA.1
symbol  ORANGE = PORTA.0
symbol  BLUE = PORTA.2

porta = %00000000
trisa = %00000000

main:
high orange
pause 1000
high green
pause 1000
high blue
pause 1000

end
    This code obviously lights the LEDs in sequence. However each LED turns off before the next one is set high. How do light one, then two, and then all three? Thanks!
  2. - 27th September 2009, 05:32 #2
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    Try this:
    Code:
    main:

PORTA = %00000001
pause 1000
PORTA = %00000011
pause 1000
PORTA = %00000111
PAUSE 1000

end
    It looks like you are experiencing a read-modify-write problem. You can search for more info on this forum.
    Charles Linquist
  3. - 27th September 2009, 06:14 #3
    Darrel Taylor's Avatar
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    Code:
    INCLUDE "AllDigital.pbp"

symbol  GREEN = PORTA.1
symbol  ORANGE = PORTA.0
symbol  BLUE = PORTA.2

porta = %00000000
trisa = %00000000

main:
high orange
pause 1000
high green
pause 1000
high blue
pause 1000

end
    DT
  4. - 27th September 2009, 06:46 #4
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    Code:
    ANSEL=%00000000
CMCON0=%00000111
    Will do the same as Darrel's suggestion and this
    http://www.picbasic.co.uk/forum/showthread.php?t=561
    plus the data sheet will actually help you learn why.
    Dave
    Always wear safety glasses while programming.
  5. - 27th September 2009, 07:41 #5
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    Quote Originally Posted by mackrackit View Post
    ...
    Will do the same as Darrel's suggestion and this
    http://www.picbasic.co.uk/forum/showthread.php?t=561
    plus the data sheet will actually help you learn why.
    Sure,
    But if you run ALLDIGITAL first, then you know where to look in the datasheets, because it's already told you what settings you need to use.
    If you want to learn, look them up.

    People never find the analog registers they need to set by looking in the datasheet first.
    DT
  6. - 27th September 2009, 08:33 #6
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    Quote Originally Posted by Darrel Taylor View Post
    Sure,
    But if you run ALLDIGITAL first, then you know where to look in the datasheets, because it's already told you what settings you need to use.
    If you want to learn, look them up.

    People never find the analog registers they need to set by looking in the datasheet first.
    If you keep going with all of your add ons (includes) you will have any PIC as easy as a STAMP.

    What is the maximum amount of includes you have used in a program?
    Dave
    Always wear safety glasses while programming.
  7. - 27th September 2009, 09:12 #7
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    Exclamation

    I hope not ... Stamp's don't bring back any memories of "Easy" for me.
    What is the maximum amount of includes you have used in a program?
    Probably 12-15, but I've never really counted.

    90% of my programs only have 2 includes.
    care to guess which ones?
    <br>
    DT
  8. - 27th September 2009, 09:37 #8
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    Quote Originally Posted by DT

    90% of my programs only have 2 includes.
    care to guess which ones?
    Care if I take a shot? Must be DT_ints and PBP_reenter.

    Embedded Systems Designer
    http://jerson.co.in
  9. - 27th September 2009, 09:42 #9
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    Ding Ding Ding ... Give that man a cigar!

    If you smoke cigars
    <br>
    DT
  10. - 27th September 2009, 16:25 #10
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    Thanks for the replies!

    Including "ALLDIGITAL.pbp" didn't affect anything (as far as I can tell). Attempting to set those registers simply gives me a couple of compiler errors about an "undefined symbol." Charle's example, however, did the trick. Any idea why the other suggestions didn't work?
  11. - 27th September 2009, 16:40 #11
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    Quote Originally Posted by Darrel Taylor View Post
    90% of my programs only have 2 includes.
    care to guess which ones?
    <br>
    BS1DEFS.BAS and BS2DEFS.BAS? lol
  12. - 27th September 2009, 19:33 #12
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    Quote Originally Posted by ShortBus View Post
    Thanks for the replies!

    Including "ALLDIGITAL.pbp" didn't affect anything (as far as I can tell). Attempting to set those registers simply gives me a couple of compiler errors about an "undefined symbol." Charle's example, however, did the trick. Any idea why the other suggestions didn't work?
    You might have the wrong chip selected in the Device drop-down box.
    Because those are the registers you need to set for a 16F688.
    <br>
    DT
  13. - 29th September 2009, 10:04 #13
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    BS1DEFS.BAS and BS2DEFS.BAS? lol
    Reply With Quote
    Very funny! Made me smile.
  14. - 30th September 2009, 01:38 #14
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    Darrel's not speaking to me now

    [gives Darrel a little prod]
  15. - 30th September 2009, 04:05 #15
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    Quote Originally Posted by comwarrior View Post
    Darrel's not speaking to me now
    Did I miss something?

    I've got that "Paying the rent" thing going on, haven't talked to hardly anyone recently.
    Why can't it be the 24th century, so we don't need money anymore?

    If you meant post #11 ...
    My opinions should be well known ...

    DT
  16. - 1st October 2009, 15:50 #16
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    Red face

    Ouch, that brings back painful memories of the time i stepped on an IC lying on it's back. No, i was not wearing shoes at the time ......
  17. - 1st October 2009, 16:01 #17
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    Quote Originally Posted by Ingvar View Post
    Ouch, that brings back painful memories of the time i stepped on an IC lying on it's back. No, i was not wearing shoes at the time ......
    One of the reasons I like surface mounts...
    Dave
    Always wear safety glasses while programming.
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