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RP2040-code/Function Generator
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README.md

Function Generator on a RP2040.

alt textWork In Progress. alt text

  • TBD:

    • Move the display to an SPI module to free up some additional GPIO ports.
    • Use the additional GPIO ports to implement a second DMA channel and add code for Lissajou figures.
    • Port the clock code from here

  • Features:

    • Direct digital synthesis (DDS) Function Generator
    • Target device = Pimoroni PGA2040 to maximise GPIO connections
    • Nixie tube display with 170 volt SMPU
    • Digital level control
    • Single 8 bit R2R Digital to Analog converter

Hardware

(150Hz Sine wave + 3rd harmonic on a vintage GEC MiniScope)