Playing audio files in a Pi Pico without a DAC

• Pico-USB-audio

  1 113 - C++

  Sigma Delta Modulation for RP2040, ESP32, Teensy

Using PWM to play audio is flawed (but usable for many applications), other approaches such a sigma-delta will lead to much better results, but with a lot more effort. https://github.com/tierneytim/Pico-USB-audio seems like a reasonable implementation at first glance.

• mico

  1 189 - HTML

  Open Source PDM to USB microphone based on the Raspberry PI RP2040. (by mkvenkit)

Agreed.

While ΔΣ modulation, also known as pulse-density modulation, is not supported in "hardware" on Pi Pico, it is possible to do it in "software" with programmable IO, like in tierneytim's Pico-USB-audio project you're linking to.

Also, PDM input could be done in similar fashion: https://github.com/mkvenkit/mico

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• driver-examples

  3 86 4.8 Rust

  Rust example programs for many of my hardware device drivers running on STM32F3 Discovery, STM32F103 "Blue Pill", RaspberryPi and micro:bit boards

It was actually quite simple and a lot of fun to write (and hear!).

Video: [1]

Source code: [2]

[1]: https://blog.eldruin.com/ad983x-waveform-generator-dds-drive...

[2]: https://github.com/eldruin/driver-examples/blob/master/stm32...

• pigweed

  1 222 10.0 C++

  Modern software development for embedded systems

  

Yep, it's a Google project. We've also got a GitHub mirror: https://github.com/google/pigweed

• ohmy

  1 - -

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