> Why? Just turn off interrupts on all the cards, and poll them every
> 1ms. Then you can call zt_transmit and zt_receive on all of them in
> order.
In *different* drivers? Can you elaborate how one driver can
poll cards handled by a different driver?
That's why my original post highlighted the lack of a global
zaptel "tick" that calls the low level drivers.
Such (not existing yet) mechanism would make your claim valid.
Actually to make it feasible all TDM devices in system should be
synchronized by TDM bus, because all devices use a clock generators
with different parameters, so you'll experience regular slips or skips
without true hardware synchronization.
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