XIAO

xiao-esp32c6/.cargo/config.toml

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+[build]
+target = "riscv32imac-esp-espidf"
+
+[target.riscv32imac-esp-espidf]
+linker = "ldproxy"
+runner = "espflash flash --monitor"
+rustflags = [ "--cfg",  "espidf_time64"]
+
+[unstable]
+build-std = ["std", "panic_abort"]
+
+[env]
+MCU="esp32c6"
+# Note: this variable is not used by the pio builder (`cargo build --features pio`)
+# ESP_IDF_VERSION = "v5.2.3"
+

xiao-esp32c6/Cargo.toml

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+[package]
+name = "xiao-esp32c6"
+version = "0.1.0"
+edition = "2024"
+
+[[bin]]
+name = "xiao-esp32c6"
+harness = false
+
+[build-dependencies]
+embuild = "*"
+
+[dependencies]
+critical-section = { version = "*", features = ["std"] }
+embassy-executor = { version = "*", features = ["arch-std", "executor-thread", "log"] }
+esp-idf-svc = { version = "*", features = ["embassy-time-driver"] }
+log = "*"
+riscv-rt = "*"
+static_cell = "*"
+
+[features]
+default = []
+experimental = ["esp-idf-svc/experimental"]
+
+[profile.release]
+opt-level = "s"
+
+[profile.dev]
+debug = true
+opt-level = "z"
+

xiao-esp32c6/build.rs

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+fn main() {
+    embuild::espidf::sysenv::output();
+}

xiao-esp32c6/sdkconfig.defaults

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+# Rust often needs a bit of an extra main task stack size compared to C (the default is 3K)
+CONFIG_ESP_MAIN_TASK_STACK_SIZE=8000
+
+# Use this to set FreeRTOS kernel tick frequency to 1000 Hz (100 Hz by default).
+# This allows to use 1 ms granularity for thread sleeps (10 ms by default).
+#CONFIG_FREERTOS_HZ=1000
+
+# Workaround for https://github.com/espressif/esp-idf/issues/7631
+#CONFIG_MBEDTLS_CERTIFICATE_BUNDLE=n
+#CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_DEFAULT_FULL=n

xiao-esp32c6/src/bin/xiao-esp32c6.rs

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+#![no_main]
+
+use embassy_executor::Executor;
+use static_cell::StaticCell;
+use xiao_esp32c6::entrypoint;
+
+static EXECUTOR: StaticCell<Executor> = StaticCell::new();
+
+#[unsafe(no_mangle)]
+fn main() {
+    EXECUTOR.init(Executor::new()).run(|spawner| {
+        spawner
+            .spawn(entrypoint(spawner))
+            .expect("Embassy should be able to spawn entrypoint task");
+    });
+}

xiao-esp32c6/src/lib.rs

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+use embassy_executor::Spawner;
+
+#[embassy_executor::task]
+pub async fn entrypoint(_spawner: Spawner) {
+    // It is necessary to call this function once. Otherwise some patches to the runtime
+    // implemented by esp-idf-sys might not link properly. See https://github.com/esp-rs/esp-idf-template/issues/71
+    esp_idf_svc::sys::link_patches();
+
+    // Bind the log crate to the ESP Logging facilities
+    esp_idf_svc::log::EspLogger::initialize_default();
+}