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rpi4-osdev/part9-sound/README.md
Adam Greenwood-Byrne 8b7079608f First commit of part9-sound code
2021-02-17 10:32:35 +00:00

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Writing a "bare metal" operating system for Raspberry Pi 4 (Part 9)

Playing sound from the audio jack

One thing our game is missing is the excitement of sound! Some beeps and squeaks would be a wonderful addition to make the gameplay more compelling. Let's work to do just that!

This code was derived from Peter Lemon's work, for which I am very grateful. It's been ported to C with some modifications to work on the Raspberry Pi 4 hardware.

Todo

  • Write-up the CPU-driven playaudio_cpu() code, explaining clocks/PWM etc.
  • Code the DMA version so we don't have to tie up the CPU
  • Add a Makefile.gcc (I'm using LLVM Clang these days, so not a priority)