Stable ADC readings

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  1. - 22nd January 2011, 20:13 #1
    mister_e's Avatar
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    I would love to see the whole code with ADCIN. Sometime if you play with some ADC registers, and you place them Before or After the DEFINEs, it may end-up with unexpected results.
    Steve

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  2. - 23rd January 2011, 10:58 #2
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    Hi,

    Found in the Datasheet ...

    Note:
    The GO/DONE bit should not be set in the
    same instruction that turns on the ADC.
    Refer to     Section 8.2.5 “A/D Conversion

    Procedure”    .
    a beginning of an explanation ???

    Alain
    ************************************************** ***********************
    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 " !!!
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  3. - 23rd January 2011, 13:05 #3
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    ADCIN doesn't work with port pin aliases. Use ADCIN 2,W0, or define PinProbe as a constant. PinProbe CON 2 would work.

    Also ADCIN doesn't setup TRIS, ANSEL or ADCON1. So you end up with Fosc/2 for your A/D clock because ADCON1 defaults to all 0's. So you're way out of spec for a 4MHz osc. Fosc/8 would be a good one to use with 4MHz (see datasheet).
    Regards,

    -Bruce
    tech at rentron.com
    http://www.rentron.com
  4. - 23rd January 2011, 13:50 #4
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    Bruce ... 1K points ...

    as always !!!...

    Shame on me.

    Alain
    ************************************************** ***********************
    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 " !!!
    *****************************************
  5. - 23rd January 2011, 20:33 #5
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    Blonde moment here too

    Disclaimer: "Blonde moment" is a deliberate sentence that belongs to Mister_e user and plah plah plah, shall not be considered as offensive plah plah plah. Complaints about that shall not be send to Admin, Mods, user but only to Mister_e user plah plah plah....
    Last edited by mister_e; - 23rd January 2011 at 20:37. Reason: Disclaimer
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  6. - 24th January 2011, 08:10 #6
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    Hi, Steve

    I Think the "Blonde" term use rights already belong to KarenHornby ...

    so, you'll have to buy a licence ...

    Alain
    ************************************************** ***********************
    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 " !!!
    *****************************************
  7. - 24th January 2011, 16:59 #7
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    busted .....
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
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