RP2040-code/Function Generator

Function Generator on a RP2040.

• TBD:

  • Port the clock code from here

• Features:

  • Direct Digital Synthesis (DDS) Function Generator
  • Dual 8 bit R-2-R Digital to Analog converter
  • Variable output level (requires MCP41020 dual digital potentiometer with SPI interface)
  • Target device = Pico (also works on Pimoroni PGA2040)
  • External, 3 digit, SPI display
  • Independant control of either channel through Putty terminal session
  • Putty terminal session over USB port

• Limitations:

  • USB serial requires Windows (10 or later)
  • Square wave rise time is slow ( distortion visable at ~10KHz )
  • Phase sync mechanism not effective at high frequencies

Two independanty controled, phase locked, DMA channels...

Early version of hardware running single channel 150Hz Sine wave + 3rd harmonic on a vintage oscilloscope...