[time-nuts] DAC for OCXO disciplining

[Hal Murray]

magnus at rubidium.se said:
> I was amazed that it was this simple to move energy to where it makes less
> damage. Turns out that FPGA logic wise, it's at the same cost as PWM. 

You can do the same thing in software.  Many small CPUs have IO gear that lets 
you send raw bits.  Just setup a buffer in memory and send it out.

Simple UARTs aren't ideal due to start/stop bits but you can probably work 
around that.  Your output range is 10% to 90% rather than 0-100.  Many serial 
ports have modes without start/stop bits.  I haven't looked carefully but some 
of the gear for simple 2 or 3 wire protocols may work.

-- 
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