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Oliver Sedlacek
02/14/13 02:11
Read: 809 times

#189361 - Please explain a bit more
Responding to: Jim Granville's previous message
Jim Granville said:

Perhaps better suited to 8051 / Small uC is what I've called a twisted ring.

All uC are connected in a ring, using 9 bit UARTS, and all controllers look for an EDGE on the 9th bit. They then extract an agreed count, and replace with replies, and move the signal edge as they do so.
So the 9th bit looks just like a twisted ring counter, as it moves along the loop. This is well suited to similar-slaves, and modern 8051 can do this to > 1MBd

Address is automatic, by location in the loop, and even the total count present can be found by checking how far the 9th bit moved. You also know the slaves are awake, and not crashed, every transaction.

I can see that a ring is a really good topology for a small number of 8051 class nodes, but can you explain your twisted ring a bit more as it sounds really interesting.

How many bits or bytes make up a packet?

Can any slave inject a packet?

Where does the twist come in?

List of 7 messages in thread
Multi-CPU designs      Josť A. Ruiz      02/13/13 02:55      
   Commonly Done       Jim Granville      02/13/13 03:41      
   Fun with network protocols      Oliver Sedlacek      02/13/13 08:55      
      and also a twisted ring network      Jim Granville      02/13/13 14:12      
         Please explain a bit more      Oliver Sedlacek      02/14/13 02:11      
            more details       Jim Granville      02/14/13 04:15      
   I'd use I¬≤C      Erik Malund      02/14/13 10:33      

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