Hello all,

A couple of years ago (tempus fugit) when I was first getting into the
PIC world, I wrote a Dallas one-wire/i-button search routine (in
assembler) to find all the devices on a one-wire bus.  Since I didn't
have any devices, I was unable to actually test the code.  Some kind
soul sent me an i-button to test with, but it ended up getting tossed
out, after a flood, by my wife as she thought it was a dead watch
battery.  James (IIRC) posted my original untested routine to the
techref site.

Well, I recently got some temp sensors and decided to test out the
routine.  Naturally, it didn't work.  :-(  Some Googling showed me that
there are still no examples of this kind of routine for the PIC since my
routine came up near the top of the search results.  This is not too
surprising as it's a convoluted process that I only barely understood
after writing my initial routine using the Dallas app note flow chart.
After some head scratching and datasheet re-evaluation, I succeeded in
getting it to work.  I only have four devices, but it finds them all
fine.

My program will scan the bus and find a maximum of four devices (16F84
memory limits and easily changed).  It then prints the 64 bit serial
number (in HEX) to a Hitachi 4*20 display.  If anyone is interested, I
will offer the code up for free, non-commercial use.

Michael Brown
Instant Net Solutions
www.KillerPCs.net

"In the land of the blind, he who has one eye is king"

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