FREQ measurement and PWM to PIO

[kd7eir]

Waveform generator resistor ladder

Sjaak pointed me to this instructable using an RP2040 to do arbitrary waveform generation at up to 125MHz using the PIO and an external resistor ladder. That project is CC NC-BY so I won’t touch it directly, but I understand from the write-up how it works and we should be able to implement the same kind of thing. [image] I made a little board with a resistor ladder and quick connector. I’m going to add an op-amp too, but I don’t have a lot of experience with op-amps at these speeds. I think G…