[aprssig] APRS bit I/O

'Scott Miller' scott at opentrac.org
Thu Jun 28 14:57:05 EDT 2007

>    Hmmmm, interesting.  According to 
> http://www.maxim-ic.com/appnotes.cfm/appnote_number/187 , you're 
> correct.  In practice, I have some long ( 100 yard ) 1-wire 
> nets with > 
> 15 or so sensors in which I definitely get the ID's back in varying 
> orders, using the DalSemi OneWireAPI libs.  Now you have me curious 
> about the reason...

Not sure.. I haven't used the APIs myself.  I've had issues with parts
dropping off the bus at weird times, but I think I've fixed those.  1-wire
is a seriously annoying protocol to try to debug.  I much prefer to stick
with SPI when I can.  Not that it's foolproof - I had a prototype on my
bench last night that started sending commands intended for a FRAM to the
PLL in the transmitter module!  Didn't seem to break anything, but it
certainly wasn't on the frequency it was supposed to be.


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