If I get it right, you will use a PIC to read a quadrature encoder, then communicate with I2C to another PIC and the second PIC will send the data to your DDS?
Does this sound logical and efficient?
You have a PIC then just do it! Use some lines in ISR and get the job done.
After all, it is a good programming exercise! And the bonus is that you will be thrilled when finished! Don't be afraid of the ISR. A bit of work but you can do it!
Ioannis
P.S. what is your current PIC?
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