64 lines
3.3 KiB
Markdown
64 lines
3.3 KiB
Markdown
# embassy-net
|
|
|
|
`embassy-net` is a no-std no-alloc async network stack, designed for embedded systems.
|
|
|
|
It builds on [`smoltcp`](https://github.com/smoltcp-rs/smoltcp). It provides a higher-level and more opinionated
|
|
API. It glues together the components provided by `smoltcp`, handling the low-level details with defaults and
|
|
memory management designed to work well for embedded systems, aiiming for a more "Just Works" experience.
|
|
|
|
## Features
|
|
|
|
- IPv4, IPv6
|
|
- Ethernet and bare-IP mediums.
|
|
- TCP, UDP, DNS, DHCPv4, IGMPv4
|
|
- TCP sockets implement the `embedded-io` async traits.
|
|
|
|
See the [`smoltcp`](https://github.com/smoltcp-rs/smoltcp) README for a detailed list of implemented and
|
|
unimplemented features of the network protocols.
|
|
|
|
## Hardware support
|
|
|
|
- [`esp-wifi`](https://github.com/esp-rs/esp-wifi) for WiFi support on bare-metal ESP32 chips. Maintained by Espressif.
|
|
- [`cyw43`](https://github.com/embassy-rs/embassy/tree/main/cyw43) for WiFi on CYW43xx chips, used in the Raspberry Pi Pico W
|
|
- [`embassy-usb`](https://github.com/embassy-rs/embassy/tree/main/embassy-usb) for Ethernet-over-USB (CDC NCM) support.
|
|
- [`embassy-stm32`](https://github.com/embassy-rs/embassy/tree/main/embassy-stm32) for the builtin Ethernet MAC in all STM32 chips (STM32F1, STM32F2, STM32F4, STM32F7, STM32H7, STM32H5).
|
|
- [`embassy-net-wiznet`](https://github.com/embassy-rs/embassy/tree/main/embassy-net-wiznet) for Wiznet SPI Ethernet MAC+PHY chips (W5100S, W5500)
|
|
- [`embassy-net-esp-hosted`](https://github.com/embassy-rs/embassy/tree/main/embassy-net-esp-hosted) for using ESP32 chips with the [`esp-hosted`](https://github.com/espressif/esp-hosted) firmware as WiFi adapters for another non-ESP32 MCU.
|
|
|
|
## Examples
|
|
|
|
- For usage with Embassy HALs and network chip drivers, search [here](https://github.com/embassy-rs/embassy/tree/main/examples) for `eth` or `wifi`.
|
|
- The [`esp-wifi` repo](https://github.com/esp-rs/esp-wifi) has examples for use on bare-metal ESP32 chips.
|
|
- For usage on `std` platforms, see [the `std` examples](https://github.com/embassy-rs/embassy/tree/main/examples/std/src/bin)
|
|
|
|
## Adding support for new hardware
|
|
|
|
To add `embassy-net` support for new hardware (i.e. a new Ethernet or WiFi chip, or
|
|
an Ethernet/WiFi MCU peripheral), you have to implement the [`embassy-net-driver`](https://crates.io/crates/embassy-net-driver)
|
|
traits.
|
|
|
|
Alternatively, [`embassy-net-driver-channel`](https://crates.io/crates/embassy-net-driver-channel) provides a higer-level API
|
|
to construct a driver that processes packets in its own background task and communicates with the `embassy-net` task via
|
|
packet queues for RX and TX.
|
|
|
|
Drivers should depend only on `embassy-net-driver` or `embassy-net-driver-channel`. Never on the main `embassy-net` crate.
|
|
This allows existing drivers to continue working for newer `embassy-net` major versions, without needing an update, if the driver
|
|
trait has not had breaking changes.
|
|
|
|
## Interoperability
|
|
|
|
This crate can run on any executor.
|
|
|
|
[`embassy-time`](https://crates.io/crates/embassy-time) is used for timekeeping and timeouts. You must
|
|
link an `embassy-time` driver in your project to use this crate.
|
|
|
|
## License
|
|
|
|
This work is licensed under either of
|
|
|
|
- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
|
|
http://www.apache.org/licenses/LICENSE-2.0)
|
|
- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
|
|
|
|
at your option.
|