Michael wrote:
>
> ; Were'synced
> ; calculate output part 1
> ; wait 2300 cycles
> ; Read inputs
> ; Choose output port
> ; calculate output part 2
> ; 170 cycles after read write output
>
> This same routine runs parallel in 3 different MCUs?
> So they have to be hardware synced.
>
> Make MCU0 the master, slaves are MCU1 and MCU2 then.
>
> MCU0 needs 2 sync-signal input port pins.
>
> MCU1+2 need 1 sync-signal output port pin.
>
> MCU1 and MCU2 need a ready input pin.
>
> When R is done, MCU1+2 set their sync signal port bit.
>
> Connect MCU2-sync-out --> MCU0-sync2-in
> Connect MCU1-sync-out --> MCU0-sync1-in
> Connect MCU0-ready-out --> MCU1+2-ready-in
>
> When Master MCU0 is ready, it pulls those incomming sync-bits until all
> are set. Now master sets his ready port pin for MCU2 and MCU3. Now you
> are synced again. Proceed...
>
> Is that what was on your mind?
That was my first idea. There are two problems, mechanical space and isolation.
The clock signal is optocoupler isolated and using more pins doesn't fit and
decoupling more signals would also use too much space.
However I'm trying to tackle this problem with simavr.
If that doesn't help I'll wirite something which calculates time for me from
source files.
Hannu Vuolasaho
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