basic project setup

firmware/.cargo/config.toml

@@ -0,0 +1,14 @@
+[target.xtensa-esp32-none-elf]
+runner = "espflash flash --monitor --chip esp32"
+
+[env]
+
+[build]
+rustflags = [
+  "-C", "link-arg=-nostartfiles",
+]
+
+target = "xtensa-esp32-none-elf"
+
+[unstable]
+build-std = ["alloc", "core"]

firmware/.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+.vscode/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# RustRover
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/

firmware/Cargo.toml

@@ -0,0 +1,56 @@
+[package]
+edition = "2021"
+name    = "firmware"
+version = "0.1.0"
+
+[[bin]]
+name = "firmware"
+path = "./src/bin/main.rs"
+
+[dependencies]
+esp-bootloader-esp-idf = "0.1.0"
+esp-hal                = { version = "=1.0.0-beta.1", features = ["esp32", "unstable"] }
+
+bleps = { git = "https://github.com/bjoernQ/bleps", package = "bleps", rev = "a5148d8ae679e021b78f53fd33afb8bb35d0b62e", features = [
+  "async",
+  "macros",
+] }
+critical-section = "1.2.0"
+embedded-io = "0.6.1"
+esp-alloc = "0.8.0"
+esp-wifi = { version = "0.14.1", features = [
+  "ble",
+  "builtin-scheduler",
+  "coex",
+  "esp-alloc",
+  "esp32",
+  "smoltcp",
+  "wifi",
+] }
+smoltcp = { version = "0.12.0", default-features = false, features = [
+  "medium-ethernet",
+  "multicast",
+  "proto-dhcpv4",
+  "proto-dns",
+  "proto-ipv4",
+  "socket-dns",
+  "socket-icmp",
+  "socket-raw",
+  "socket-tcp",
+  "socket-udp",
+] }
+
+
+[profile.dev]
+# Rust debug is too slow.
+# For debug builds always builds with some optimization
+opt-level = "s"
+
+[profile.release]
+codegen-units    = 1     # LLVM can perform better optimizations using a single thread
+debug            = 2
+debug-assertions = false
+incremental      = false
+lto              = 'fat'
+opt-level        = 's'
+overflow-checks  = false

firmware/build.rs

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+fn main() {
+    linker_be_nice();
+    // make sure linkall.x is the last linker script (otherwise might cause problems with flip-link)
+    println!("cargo:rustc-link-arg=-Tlinkall.x");
+}
+
+fn linker_be_nice() {
+    let args: Vec<String> = std::env::args().collect();
+    if args.len() > 1 {
+        let kind = &args[1];
+        let what = &args[2];
+
+        match kind.as_str() {
+            "undefined-symbol" => match what.as_str() {
+                "_defmt_timestamp" => {
+                    eprintln!();
+                    eprintln!("💡 `defmt` not found - make sure `defmt.x` is added as a linker script and you have included `use defmt_rtt as _;`");
+                    eprintln!();
+                }
+                "_stack_start" => {
+                    eprintln!();
+                    eprintln!("💡 Is the linker script `linkall.x` missing?");
+                    eprintln!();
+                }
+                "esp_wifi_preempt_enable"
+                | "esp_wifi_preempt_yield_task"
+                | "esp_wifi_preempt_task_create" => {
+                    eprintln!();
+                    eprintln!("💡 `esp-wifi` has no scheduler enabled. Make sure you have the `builtin-scheduler` feature enabled, or that you provide an external scheduler.");
+                    eprintln!();
+                }
+                "embedded_test_linker_file_not_added_to_rustflags" => {
+                    eprintln!();
+                    eprintln!("💡 `embedded-test` not found - make sure `embedded-test.x` is added as a linker script for tests");
+                    eprintln!();
+                }
+                _ => (),
+            },
+            // we don't have anything helpful for "missing-lib" yet
+            _ => {
+                std::process::exit(1);
+            }
+        }
+
+        std::process::exit(0);
+    }
+
+    println!(
+        "cargo:rustc-link-arg=-Wl,--error-handling-script={}",
+        std::env::current_exe().unwrap().display()
+    );
+}

firmware/rust-toolchain.toml

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+[toolchain]
+channel = "esp"

firmware/src/lib.rs

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+#![no_std]

firmware/tests/hello_test.rs

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+//! Demo test suite using embedded-test
+//!
+//! You can run this using `cargo test` as usual.
+
+#![no_std]
+#![no_main]
+
+#[cfg(test)]
+#[embedded_test::tests]
+mod tests {
+    use esp_hal as _;
+
+    #[init]
+    fn init() {
+        let _ = esp_hal::init(esp_hal::Config::default());
+    }
+
+    #[test]
+    fn hello_test() {
+        assert_eq!(1 + 1, 2);
+    }
+}