Read a BCD value (Thumbwheel Switch)

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  1. - 5th December 2005, 11:53 #1
    KD6OJI's Avatar
    KD6OJI
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    Question So how would one do this with PORTA on a 16F628?

    I too am a NU B. I understand the coding from Melanies example. But how would I config PORTA 0-3 to read my switch. Seems the option register only controls port B options. I know it is probably uber simple, just eluding me at the time!

    Thanks in advance...

    Shawn
  2. - 5th December 2005, 12:04 #2
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    KD6OJI
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    Wink Arghhhhhh... documentation is da bomb..

    I found my answer!!!

    CMCON and VRCON control the configuration and behavior of PORTA..

    wow.. love these things, learing a lot just flashing LED's
  3. - 5th December 2005, 19:03 #3
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    You also have to use external pull-ups for porta. I believe portb is the only one that has them.
  4. - 5th December 2005, 19:30 #4
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    Hello KD6OJI,

    What class are you? Extra Class here for decades. have a few Hams around here... some from England, Some from Cal <g>, and some from Kansas. And another in 8 land.

    Dwayne
    Ability to Fly:
    Hurling yourself towards the ground, and missing.

    Engineers that Contribute to flying:
    Both optimists and pessimists contribute to the society. The optimist invents the aeroplane, the pessimist the parachute

    Pilots that are Flying:
    Those who know their limitations, and respect the green side of the grass...
  5. - 5th December 2005, 21:52 #5
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    KD6OJI
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    Talking Thanks!

    External pullups aren't a problem, thats easy.
    just had to figure out HOW to tell port A not to be fancy, just be a lowly input pin.


    As for me, Tech no code since 92.. Living in Dallas TX area now, originally licensed in CA.
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