Problems with 1-Wire DS2438 and PIC16F88

[HeadCase]

Thanks for your help, Darrel! Your EXT methods will be a great help with other projects.

After adding in your code, I noticed that the raw data was still a series of 1's. I switched to a DS18B20 using your suggested code (with slight modification to the one-wire commands) and it worked perfectly.

For kicks, I removed all of the 1-Wire devices and the raw data is still showing 1's. Seems like the PIC is reading the pin's state (pulled up with a resistor) rather than the data coming over the DQ wire. While the wiring and code seem correct and appear to conform with the datasheets, perhaps I'm missing something?

[Darrel Taylor]

Try adding this before the Read command. (after the conversion)

OWOUT DQ_Pin,1,[$CC, $B8, $00] ' Recall Memory page 0

From the datasheet ...

Recall Memory [B8hxxh]
This command recalls the stored values in EEPROM / SRAM page xxh to the scratchpad page xxh.
This command must proceed a Read SPxx command in order to read any page of memory on the DS2438.

hth,

[HeadCase]

That worked perfectly. While I figured the recall function was a bit redundant, after some more studying of the datasheet, it now makes sense. I'll post the complete code and schematic once I've completed the project.

Thanks for your help, Darrel.