esp-fast-serial

Fast serial communication for ESP32-S3 and similar microcontrollers that has a built-in USB Serial JTAG interface.

Features

• Much faster than the default esp-println implementation.
• Uses the built-in USB Serial JTAG interface.
• No need for external hardware.
• Provides a fast concurrent defmt printer.
• Provides a direct write function for ASCII/raw data alongside defmt logging.
• Provides a custom halt function that allows reflashing without disconnecting the USB cable.

Limitations

• Only supports defmt messages that are less than 2048 bytes.
  • This is due to the current implementation of the "global" logger.
  • As defmt messages cannot be interleaved, we have to make a global buffer to store the full message.
  • It is possible to create your own local logger that can handle larger messages.
• Currently only supports the S3 and the C6

Usage

Add the following to your Cargo.toml:

[dependencies]
esp-fast-serial = { version = "0.5.0", features = ["esp32s3"] }

Then, in your main.rs:

spawner.spawn(esp_fast_serial::serial_comm_task(peripherals.USB_DEVICE));

// After the task created the serial I/O, you can get the handle to the RX queue
let reader = esp_fast_serial::reader_take();

License

MIT OR Apache-2.0