DS1307 returns incorrect data ???

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  1. - 7th October 2009, 02:30 #1
    gtvmarty's Avatar
    gtvmarty
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    Although i'm NOW writing as hex data to keep things clear for me, i think my main problem is Reading/converting the 'read data' into correct decimal form.

    getting closer ;-)
    Marty.
  2. - 7th October 2009, 04:44 #2
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    Look at the DS1307 registers and format your data accordingly. The values you write should be packed BCD values wherever needed.

    eg: To write 21 minutes, you need to write HEX 21 to the minutes register. Same for the other registers like hours and seconds. Only make sure to write to the bits needed by the registers.

    I haven't used PBP to write a DS1307 yet, but have some C code that works with the IC. Let me know if you wish to look at it for inspiration
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  3. - 7th October 2009, 05:24 #3
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    This is for a DS1337C but it might give you an idea...

    Routine to set the RTC:
    Code:
    <font color="#0000FF"><b>SET_RTC</b></font>:
<font color="#0000FF"><b>yr </b></font>= <font color="#800000"><b>$09
</b></font><font color="#0000FF"><b>mon </b></font>= <font color="#800000"><b>$03
</b></font><font color="#0000FF"><b>date </b></font>= <font color="#800000"><b>$07
</b></font><font color="#0000FF"><b>sec </b></font>= <font color="#800000"><b>$00
</b></font><font color="#0000FF"><b>mins </b></font>= <font color="#800000"><b>$28
</b></font><font color="#0000FF"><b>hr </b></font>= <font color="#800000"><b>$05
</b></font><font color="#FF0000"><b>I2CWRITE </b></font><font color="#0000FF"><b>DS_SDA</b></font>, <font color="#0000FF"><b>DS_SCL</b></font>, <font color="#0000FF"><b>RTC</b></font>, <font color="#0000FF"><b>SecReg</b></font>, [<font color="#0000FF"><b>sec</b></font>,<font color="#0000FF"><b>mins</b></font>,<font color="#0000FF"><b>hr</b></font>,<font color="#0000FF"><b>day</b></font>,<font color="#0000FF"><b>date</b></font>,<font color="#0000FF"><b>mon</b></font>,<font color="#0000FF"><b>yr</b></font>]
<font color="#FF0000"><b>RETURN 
</b></font>
    To READ and send to terminal:
    Code:
    <font color="#FF0000"><b>I2CREAD </b></font><font color="#0000FF"><b>DS_SDA</b></font>, <font color="#0000FF"><b>DS_SCL</b></font>, <font color="#0000FF"><b>RTC</b></font>, <font color="#0000FF"><b>SecReg</b></font>, [<font color="#0000FF"><b>sec</b></font>,<font color="#0000FF"><b>MINs</b></font>,<font color="#0000FF"><b>hr</b></font>,<font color="#0000FF"><b>day</b></font>,<font color="#0000FF"><b>date</b></font>,<font color="#0000FF"><b>mon</b></font>,<font color="#0000FF"><b>yr</b></font>] 
<font color="#FF0000"><b>PAUSE </b></font><font color="#800000"><b>100
</b></font><font color="#FF0000"><b>SEROUT2 </b></font><font color="#0000FF"><b>PORTC</b></font>.<font color="#800000"><b>6</b></font>, <font color="#800000"><b>16572</b></font>, [ <b>&quot;TIME &quot;</b>, <font color="#FF0000"><b>HEX2 </b></font><font color="#0000FF"><b>hr</b></font>, <b>&quot;:&quot;</b>, <font color="#FF0000"><b>HEX2 </b></font><font color="#0000FF"><b>MINs</b></font>, <b>&quot;:&quot;</b>,<font color="#FF0000"><b>HEX2 </b></font><font color="#0000FF"><b>sec</b></font>,<font color="#800000"><b>$d</b></font>, <font color="#800000"><b>$a</b></font>]
<font color="#FF0000"><b>SEROUT2 </b></font><font color="#0000FF"><b>PORTC</b></font>.<font color="#800000"><b>6</b></font>, <font color="#800000"><b>16572</b></font>, [ <b>&quot;DATE &quot;</b>, <font color="#FF0000"><b>HEX2 </b></font><font color="#0000FF"><b>mon</b></font>,<b>&quot;-&quot;</b>,<font color="#FF0000"><b>HEX2 </b></font><font color="#0000FF"><b>date</b></font>,<b>&quot;-&quot;</b>,<font color="#FF0000"><b>HEX2 </b></font><font color="#0000FF"><b>yr</b></font>,<font color="#800000"><b>$d</b></font>, <font color="#800000"><b>$a</b></font>]
    Dave
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  4. - 7th October 2009, 07:37 #4
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    Thanx Dave, i'll try that when time allows....

    I tried some things from other examples recently, but anything with a DEC2 or HEX2 command in it wouldn't compile for me.

    I was using PBP 2.40 with Code Designer lite 1.7, although today i've just purchased PBP 2.60 upgrade (& manual) from local supplier.

    Does it sound possible that v2.4 didn't support DEC/HEX commands?

    Anyway, back to it
    Marty.
  5. - 7th October 2009, 11:48 #5
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    Quote Originally Posted by gtvmarty View Post
    Does it sound possible that v2.4 didn't support DEC/HEX commands?
    Not sure, could be.
    Make sure your local supplier does not sell you an old version. Get 2.6.
    Last edited by mackrackit; - 7th October 2009 at 12:01.
    Dave
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  6. - 7th October 2009, 11:53 #6
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    Yep, it IS v2.6 from Dontronics (Aus).
  7. - 8th October 2009, 09:54 #7
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    hello

    a good example of converting binary bcd
    http://www.picaxeforum.co.uk/showthr...307+Correction
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