Matching time conditions

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  1. - 30th March 2010, 07:25 #1
    Acetronics2's Avatar
    Acetronics2
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    Talking just choose the good module !!!

    Hi, Malc

    The other RTC Module from MKE ( W/a PCF8583 ) has an Alarm function ...

    no comment needed ???

    Alain
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  2. - 30th March 2010, 07:29 #2
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    Alain, another module to add to my collection....

    Don't tell the wife I'm spending more money on this project
  3. - 5th April 2010, 17:08 #3
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    Alain,

    Quick question, I take it this new module will still work with the same code for the DS1307, ie

    Code:
    I2CRead SDApin,SCLpin,$D0,$00,[RTCSec,RTCMin,RTCHour,RTCWDay,RTCDay,RTCMonth,RTCYear,RTCCtrl]
    Incidentally, can someone break down that line. I understand it's the code to read the I2C channel, data pin, clock pin, and then the current value for each of the time / date fragments, but in what format is the raw code. It mentions BCD ?

    Also, do you have to read [RTCSec,RTCMin,RTCHour,RTCWDay,RTCDay,RTCMonth,RTCY ear,RTCCtrl] in one hit, or could you choose to read back just the hours and mins ?
  4. - 5th April 2010, 17:56 #4
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    DATASHEET!!!!

    Just as you wouldn't have a clue what CMCON was for a PIC that you never met before, in the same way you need to know what Registers you've got inside your DS1307, in what sequence you arrive at them, and what their contents are.

    Download the DATASHEET for the DS1307.

    You will follow the SAME proceedure for ANY complex chip (or device) that you come across. Copying and relying on other peoples code is insufficient. It's worse than trying to decypher Egyptian without the Rosetta stone.

    And in answer to your question, you can choose to read back whatever you want in whatever sequence you want (though not nescessarilly in one I2C instruction)... the DATASHEET will explain how and reveal other Registers, features and goodies which you may be unaware of, and which the code you are copying from does not take advantage of.
  5. - 11th April 2010, 16:57 #5
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    Quote Originally Posted by Acetronics View Post

    The other RTC Module from MKE ( W/a PCF8583 ) has an Alarm function ...
    Well after a lot of searching I've just ordered that module...

    Seems that none of the usual electronics outlets stock the DS1337 (RS, Rapid etc). Hopefully the module will be here mid week so I can start playing again

    Better start reading the datasheet - even if it's only to keep Mel happy
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