Problems with 1-Wire DS2438 and PIC16F88

[Darrel Taylor]

Here's an easy way to read the whole page ...

Using a technique shown here (Typcasting Variables inside of Arrays)

<font color="#000000"><b>DSbuffer  </b><font color="#008000"><b>VAR BYTE</b></font>[<font color="#800000"><b>9</b></font>] <b>BANK0</b>
<font color="#008000"><b>ASM
</b></font><font color="#000080">DSstat    = _DSbuffer      </font><font color="#0000FF"><b><i>; byte
</i></b></font><font color="#000080">DStemp    = _DSbuffer + 1  </font><font color="#0000FF"><b><i>; word
</i></b></font><font color="#000080">DSvolts   = _DSbuffer + 3  </font><font color="#0000FF"><b><i>; word
</i></b></font><font color="#000080">DScurrent = _DSbuffer + 5  </font><font color="#0000FF"><b><i>; word
</i></b></font><font color="#000080">DSthres   = _DSbuffer + 7  </font><font color="#0000FF"><b><i>; byte
</i></b></font><font color="#000080">DScrc     = _DSbuffer + 8  </font><font color="#0000FF"><b><i>; byte
</i></b></font><font color="#008000"><b>ENDASM

</b></font><b>DSstat    </b><font color="#008000"><b>VAR  BYTE  </b></font><b>EXT </b><font color="#0000FF"><b><i>; Status/Configuration
</i></b></font><b>DStemp    </b><font color="#008000"><b>VAR  WORD  </b></font><b>EXT </b><font color="#0000FF"><b><i>; Temperature
</i></b></font><b>DSvolts   </b><font color="#008000"><b>VAR  WORD  </b></font><b>EXT </b><font color="#0000FF"><b><i>; Voltage
</i></b></font><b>DScurrent </b><font color="#008000"><b>VAR  WORD  </b></font><b>EXT </b><font color="#0000FF"><b><i>; Current
</i></b></font><b>DSthres   </b><font color="#008000"><b>VAR  BYTE  </b></font><b>EXT </b><font color="#0000FF"><b><i>; Threshold
</i></b></font><b>DScrc     </b><font color="#008000"><b>VAR  BYTE  </b></font><b>EXT </b><font color="#0000FF"><b><i>; CRC</i></b></font>

Then you can read page 0 like this ...<table><tr><td>

<font color="#008000"><b>OWOUT </b></font><b>DQ_Pin</b>,<font color="#800000"><b>1</b></font>,[<font color="#800000"><b>$CC</b></font>, <font color="#800000"><b>$B8</b></font>, <font color="#800000"><b>$00</b></font>] <font color="#0000FF"><b><i>' Skip ROM search, Recall Memory page 0
</i></b></font><font color="#008000"><b>OWOUT </b></font><b>DQ_Pin</b>,<font color="#800000"><b>1</b></font>,[<font color="#800000"><b>$CC</b></font>, <font color="#800000"><b>$BE</b></font>, <font color="#800000"><b>$00</b></font>] <font color="#0000FF"><b><i>' Skip ROM search, Read page 0
</i></b></font><font color="#008000"><b>OWIN  </b></font><b>DQ_Pin</b>,<font color="#800000"><b>2</b></font>,[<font color="#008000"><b>STR </b></font><b>DSbuffer</b>\<font color="#800000"><b>9</b></font>]<font color="#0000FF"><b><i>' Read 9 bytes</i></b></font>

</td><td valign=top><br><br>Recall Memory added: see next few posts.</td></tr></table>
After reading, all the values will be in the correct variables, with the correct size (word/byte), ready to be used.

hth,