Setup

Hardware pinout

LCD

ST7735	ESP32 GPIO	description
LED	GPIO 18	backlight
SCK	GPIO 14	SPI SCL
SDA	GPIO 13	SPI MOSI
A0	GPIO 17	? command/data selection ?
RESET	GPIO 16	LCD reset, active low
CS	GPIO 15	chip select

LEDs

ESP32 GPIO	description
GPIO 19	left eye / LED0
GPIO 21	right eye / LED1

Linux simulator build

Make sure to use the main branch. cargo run will do the trick.

ESP32 build

See "Rust on ESP" book for instructions for setting up the toolchain: https://docs.esp-rs.org/book/introduction.html

Either use the esp32 branch, or:

1. Uncomment the line in build.rs file.

   #[cfg] are not defined when building it, and embuild::espidf just doesn't exist on non-ESP builds so a runtime check fails to compile. Of course there's a 6-year-old issue about this. rust-lang/cargo#4932

2. Uncomment the channel = "esp" line in rust-toolchain.toml file, and comment the channel = "stable" one.

3. Uncomment the #target = "xtensa-esp32-espidf" line in .cargo/config.toml.