RP2040-code/Function Generator

Function Generator on a RP2040.

• Features:

  • Direct Digital Synthesis (DDS) Function Generator
  • Independant control of either channel through Putty terminal session over USB port
  • Dual 8 bit R-2R Digital to Analog converter
  • 1Hz => 1MHz frequency range.
  • X-Y mode for Analog clock
  • Variable output level 0=>100%
  • External, 3 digit, SPI display
  • Target device = Pico (also works on Pimoroni PGA2040)

• Limitations:

  • USB serial requires Windows (10 or later)
  • Phase sync mechanism not effective at high frequencies
  • Target device must be overclocked for 1MHz operation

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

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

X-Y mode for Analog Clock Simulator on a CRT Oscilloscope...