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144 lines
7.1 KiB
Plaintext
144 lines
7.1 KiB
Plaintext
= Getting started
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So you want to try Embassy, great! To get started, there are a few tools you need to install:
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* link:https://rustup.rs/[rustup] - the Rust toolchain is needed to compile Rust code.
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* link:https://probe.rs/[probe-rs] - to flash the firmware on your device. If you already have other tools like `OpenOCD` setup, you can use that as well.
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If you don't have any supported board, don't worry: you can also run embassy on your PC using the `std` examples.
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== Getting a board with examples
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Embassy supports many microcontroller families, but the quickest way to get started is by using a board which Embassy has existing example code for.
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This list is non-exhaustive. If your board isn’t included here, check the link:https://github.com/embassy-rs/embassy/tree/main/examples[examples folder] to see if example code has been written for it.
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=== nRF kits
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* link:https://www.nordicsemi.com/Products/Development-hardware/nrf52-dk[nRF52 DK]
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* link:https://www.nordicsemi.com/Products/Development-hardware/nRF9160-DK[nRF9160 DK]
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=== STM32 kits
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* link:https://www.st.com/en/evaluation-tools/nucleo-h743zi.html[STM32 Nucleo-144 development board with STM32H743ZI MCU]
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* link:https://www.st.com/en/evaluation-tools/nucleo-f429zi.html[STM32 Nucleo-144 development board with STM32F429ZI MCU]
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* link:https://www.st.com/en/evaluation-tools/b-l4s5i-iot01a.html[STM32L4+ Discovery kit IoT node, low-power wireless, BLE, NFC, WiFi]
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* link:https://www.st.com/en/evaluation-tools/b-l072z-lrwan1.html[STM32L0 Discovery kit LoRa, Sigfox, low-power wireless]
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* link:https://www.st.com/en/evaluation-tools/nucleo-wl55jc.html[STM32 Nucleo-64 development board with STM32WL55JCI MCU]
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* link:https://www.st.com/en/evaluation-tools/b-u585i-iot02a.html[Discovery kit for IoT node with STM32U5 series]
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=== RP2040 kits
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* link:https://www.raspberrypi.com/products/raspberry-pi-pico/[Raspberry Pi Pico]
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=== ESP32
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* link:https://github.com/esp-rs/esp-rust-board[ESP32C3]
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== Running an example
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First you need to clone the link:https://github.com/embassy-rs/embassy[github repository];
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[source, bash]
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----
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git clone https://github.com/embassy-rs/embassy.git
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cd embassy
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----
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Once you have a copy of the repository, find examples folder for your board and, and build an example program. `blinky` is a good choice as all it does is blink an LED – the embedded world’s equivalent of “Hello World”.
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[source, bash]
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----
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cd examples/nrf52840
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cargo build --bin blinky --release
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----
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Once you’ve confirmed you can build the example, connect your computer to your board with a debug probe and run it on hardware:
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[source, bash]
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----
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cargo run --bin blinky --release
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----
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If everything worked correctly, you should see a blinking LED on your board, and debug output similar to this on your computer:
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[source]
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----
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Finished dev [unoptimized + debuginfo] target(s) in 1m 56s
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Running `probe-run --chip STM32F407VGTx target/thumbv7em-none-eabi/debug/blinky`
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(HOST) INFO flashing program (71.36 KiB)
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(HOST) INFO success!
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────────────────────────────────────────────────────────────────────────────────
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0 INFO Hello World!
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└─ blinky::__embassy_main::task::{generator#0} @ src/bin/blinky.rs:18
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1 INFO high
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└─ blinky::__embassy_main::task::{generator#0} @ src/bin/blinky.rs:23
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2 INFO low
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└─ blinky::__embassy_main::task::{generator#0} @ src/bin/blinky.rs:27
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3 INFO high
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└─ blinky::__embassy_main::task::{generator#0} @ src/bin/blinky.rs:23
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4 INFO low
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└─ blinky::__embassy_main::task::{generator#0} @ src/bin/blinky.rs:27
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----
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NOTE: How does the `+cargo run+` command know how to connect to our board and program it? In each `examples` folder, there’s a `.cargo/config.toml` file which tells cargo to use link:https://probe.rs/[probe-rs] as the runner for ARM binaries in that folder. probe-rs handles communication with the debug probe and MCU. In order for this to work, probe-rs needs to know which chip it’s programming, so you’ll have to edit this file if you want to run examples on other chips.
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=== It didn’t work!
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If you hare having issues when running `+cargo run --release+`, please check the following:
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* You are specifying the correct `+--chip+` on the command line, OR
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* You have set `+.cargo/config.toml+`’s run line to the correct chip, AND
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* You have changed `+examples/Cargo.toml+`’s HAL (e.g. embassy-stm32) dependency's feature to use the correct chip (replace the existing stm32xxxx feature)
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At this point the project should run. If you do not see a blinky LED for blinky, for example, be sure to check the code is toggling your board's LED pin.
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If you are trying to run an example with `+cargo run --release+` and you see the following output:
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[source]
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----
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0.000000 INFO Hello World!
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└─ <invalid location: defmt frame-index: 14>
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0.000000 DEBUG rcc: Clocks { sys: Hertz(80000000), apb1: Hertz(80000000), apb1_tim: Hertz(80000000), apb2: Hertz(80000000), apb2_tim: Hertz(80000000), ahb1: Hertz(80000000), ahb2: Hertz(80000000), ahb3: Hertz(80000000) }
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└─ <invalid location: defmt frame-index: 124>
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0.000061 TRACE allocating type=Interrupt mps=8 interval_ms=255, dir=In
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└─ <invalid location: defmt frame-index: 68>
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0.000091 TRACE index=1
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└─ <invalid location: defmt frame-index: 72>
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----
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To get rid of the frame-index error add the following to your `Cargo.toml`:
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[source,toml]
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----
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[profile.release]
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debug = 2
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----
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If you’re getting an extremely long error message containing something like the following:
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[source]
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----
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error[E0463]: can't find crate for `std`
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= note: the `thumbv6m-none-eabi` target may not support the standard library
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= note: `std` is required by `stable_deref_trait` because it does not declare `#![no_std]`
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----
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Make sure that you didn’t accidentally run `+cargo add probe-rs+` (which adds it as a dependency) instead of link:https://probe.rs/docs/getting-started/installation/[correctly installing probe-rs].
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If you’re using a raspberry pi pico-w, make sure you’re running `+cargo run --bin wifi_blinky --release+` rather than the regular blinky. The pico-w’s on-board LED is connected to the WiFi chip, which needs to be initialized before the LED can be blinked.
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If you’re using an rp2040 debug probe (e.g. the pico probe) and are having issues after running `probe-rs info`, unplug and reconnect the probe, letting it power cycle. Running `probe-rs info` is link:https://github.com/probe-rs/probe-rs/issues/1849[known to put the pico probe into an unusable state].
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If you’re still having problems, check the link:https://embassy.dev/book/#_frequently_asked_questions[FAQ], or ask for help in the link:https://matrix.to/#/#embassy-rs:matrix.org[Embassy Chat Room].
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== What's next?
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Congratulations, you have your first Embassy application running! Here are some suggestions for where to go from here:
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* Read more about the xref:_embassy_executor[executor].
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* Read more about the xref:_hardware_abstraction_layer_hal[HAL].
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* Start xref:_a_basic_embassy_application[writing your application].
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* Learn how to xref:_starting_a_new_project[start a new embassy project by adapting an example].
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