Controlling a Si5351 syntethizer through a Unix like shell and generating frequencies throughout its entire range.
The shell is provided by a RP2040 (Pico board), it uses a USB CDC connection and the SDK makes programming this the same as on a Unix OS (stdinand stdout wise).
The oscilloscope used to measure was terminated at a high impedance, I pray to god that this is what caused the ringing on the square waves, a 50 ohm terminator should provide better results.
Check out the source code: github.com/crazybolillo/pico53
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