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1= Project Structure
2
3There are many ways to configure embassy and it's components for your exact application. The link:https://github.com/embassy-rs/embassy/tree/main/examples[examples] directory for each chipset demonstrate how your project structure should look. Let's break it down:
4
5The toplevel file structure of your project should look like this:
6[source,plain]
7----
8{} = Maybe
9
10my-project
11|- .cargo
12| |- config.toml
13|- src
14| |- main.rs
15|- build.rs
16|- Cargo.toml
17|- {memory.x}
18|- rust-toolchain.toml
19----
20
21=== .cargo/config.toml
22
23This directory/file describes what platform you're on, and configures link:https://github.com/probe-rs/probe-rs[probe-rs] to deploy to your device.
24
25Here is a minimal example:
26
27[source,toml]
28----
29[target.thumbv6m-none-eabi] # <-change for your platform
30runner = 'probe-rs run --chip STM32F031K6Tx' # <- change for your chip
31
32[build]
33target = "thumbv6m-none-eabi" # <-change for your platform
34
35[env]
36DEFMT_LOG = "trace" # <- can change to info, warn, or error
37----
38
39=== build.rs
40
41This is the build script for your project. It links defmt (what is defmt?) and the `memory.x` file if need be. This file is pretty specific for each chipset, just copy and paste from the corresponding link:https://github.com/embassy-rs/embassy/tree/main/examples[example].
42
43=== Cargo.toml
44
45This is your manifest file, where you can configure all of the embassy components to use the features you need.
46
47TODO: someone should exhaustively describe every feature for every component!
48
49=== memory.x
50
51This file outlines the flash/ram usage of your program. It is especially useful when using link:https://github.com/embassy-rs/nrf-softdevice[nrf-softdevice] on an nRF5x.
52
53Here is an example for using S140 with an nRF52840:
54
55[source,x]
56----
57MEMORY
58{
59 /* NOTE 1 K = 1 KiBi = 1024 bytes */
60 /* These values correspond to the NRF52840 with Softdevices S140 7.0.1 */
61 FLASH : ORIGIN = 0x00027000, LENGTH = 868K
62 RAM : ORIGIN = 0x20020000, LENGTH = 128K
63}
64----
65
66=== rust-toolchain.toml
67
68This file configures the rust version and configuration to use.
69
70A minimal example:
71
72[source,toml]
73----
74[toolchain]
75channel = "nightly-2023-08-19" # <- as of writing, this is the exact rust version embassy uses
76components = [ "rust-src", "rustfmt" ] # <- optionally add "llvm-tools-preview" for some extra features like "cargo size"
77targets = [
78 "thumbv6m-none-eabi" # <-change for your platform
79]
80----