This is a test to port C++'s ymfm and Rust's vgmplay to ESP32(Xtensa).

hiromasa

Last update: Feb 26, 2023

Overview

m5stack-chipstream

This is a test to port C++'s ymfm and Rust's vgmplay to ESP32(Xtensa).

Still slow and impractical, depending on the sound chip you choose.

Environment

M5Stack Core2 (ESP32 PSRAM 4MB+4MB)
M5Stack RCA Module (I2S PCM5102APWR)

Demo

🎥 https://twitter.com/h1romas4/status/1629345305861947393

TODO

The transfer of PCM waveforms from Rust to C is shifted depending on the memory state. (Is it due to int16_t alignment?)
I may be using the ring buffer or I2S DMA incorrectly. The process slows down from the same time, independent of the waveform generation process time.
Player control is not complete. May stop when transitioning to next song.
There is no interface to stop playback.

Build

@see .github/workflows/build.yml

Setup

Setup ESF-IDF v4.4.3

get_idf

alias get_idf='. $HOME/esp/esp-idf/export.sh'

$ get_idf
Detecting the Python interpreter
... snip ...
Done! You can now compile ESP-IDF projects.
Go to the project directory and run:

  idf.py build

$ echo ${IDF_PATH}
/home/hiromasa/devel/toolchain/esp/esp-idf

$ xtensa-esp32-elf-gcc -v
Using built-in specs.
COLLECT_GCC=xtensa-esp32-elf-gcc
COLLECT_LTO_WRAPPER=/home/hiromasa/.espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0/xtensa-esp32-elf/bin/../libexec/gcc/xtensa-esp32-elf/8.4.0/lto-wrapper
lto-wrapper
Target: xtensa-esp32-elf
... snip ...
Thread model: posix
gcc version 8.4.0 (crosstool-NG esp-2021r2-patch5)

Setup Rust Xtensa toolchaine

https://github.com/esp-rs/espup

curl -L https://github.com/esp-rs/espup/releases/latest/download/espup-x86_64-unknown-linux-gnu -o espup
chmod a+x espup
./espup install

cat ~/export-esp.sh
export LIBCLANG_PATH="/home/hiromasa/.espressif/tools/xtensa-esp32-elf-clang/esp-15.0.0-20221201-x86_64-unknown-linux-gnu/esp-clang/lib"
export CLANG_PATH="/home/hiromasa/.espressif/tools/xtensa-esp32-elf-clang/esp-15.0.0-20221201-x86_64-unknown-linux-gnu/esp-clang/bin/clang"

$ ls -laF ~/.rustup/toolchains/esp/
合計 28
drwxrwxr-x 7 hiromasa hiromasa 4096  2月 14 20:56 ./
drwxrwxr-x 9 hiromasa hiromasa 4096  2月 14 20:55 ../
drwxr-xr-x 2 hiromasa hiromasa 4096  2月 14 20:56 bin/
drwxr-xr-x 3 hiromasa hiromasa 4096  2月 14 20:56 etc/
drwxr-xr-x 3 hiromasa hiromasa 4096  2月 14 20:56 lib/
drwxr-xr-x 2 hiromasa hiromasa 4096  2月 14 20:56 libexec/
drwxr-xr-x 5 hiromasa hiromasa 4096  2月 14 20:56 share/
$ ~/.rustup/toolchains/esp/bin/rustc -V
rustc 1.67.0-nightly (725e31c21 2023-01-25)

$ ls -laF ~/.espressif/tools/xtensa-esp32-elf-clang/
合計 12
drwxrwxr-x  3 hiromasa hiromasa 4096  2月 14 20:58 ./
drwxrwxr-x 13 hiromasa hiromasa 4096  2月 14 20:58 ../
drwxrwxr-x  3 hiromasa hiromasa 4096  2月 14 20:58 esp-15.0.0-20221201-x86_64-unknown-linux-gnu/

Compile and Flash

git clone and build

git clone --recursive https://github.com/h1romas4/m5stack-chipstream
cd m5stack-chipstream
idf.py build

Restart M5Stack Core 2

idf.py flash monitor

Dependencies

Thanks for all the open source.

Name	Version	License
esp-idf	`v4.4.3`	BSD License
arduino-esp32	`2.0.6`	LGPL-2.1 License
M5Core2	`0.1.5`	MIT License
M5EPD	`0.1.4`	The FreeType License(FreeType Part)
M5GFX	`0.1.4`	MIT license
ymfm	`d641a806`	BSD-3-Clause license
libymfm.wasm	`v0.16.0`	BSD-3-Clause license (include MAME's soundchip ports)

License

BSD-3-Clause License

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