hi;
erik malund wrote:
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The "flag" method sometimes leads to lost data, the "do the time dependent, get out" does not with proper design.

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that is why i wrote about counter.the variations are possible:
1.use counter,prod_index,consum_index:this shall be useful with circular buffers/unprioritized mailboxes.typically useful for fifo.
2.counter and (maybe)index for lifo.counter++ in ISR counter-- in main.
regards
pranav