setup esp32-c3 project, target: riscv32imc-esp-espidf, toolchain: nightly

.cargo/config.toml

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+[build]
+# Uncomment the relevant target for your chip here (ESP32, ESP32-S2, ESP32-S3 or ESP32-C3)
+#target = "xtensa-esp32-espidf"
+#target = "xtensa-esp32s2-espidf"
+#target = "xtensa-esp32s3-espidf"
+target = "riscv32imc-esp-espidf"
+
+[target.xtensa-esp32-espidf]
+linker = "ldproxy"
+
+[target.xtensa-esp32s2-espidf]
+linker = "ldproxy"
+
+[target.xtensa-esp32s3-espidf]
+linker = "ldproxy"
+
+[target.riscv32imc-esp-espidf]
+linker = "ldproxy"
+
+# Future - necessary for the experimental "native build" of esp-idf-sys with ESP32C3
+# See also https://github.com/ivmarkov/embuild/issues/16
+rustflags = ["-C", "default-linker-libraries"]
+
+[unstable]
+
+build-std = ["std", "panic_abort"]
+#build-std-features = ["panic_immediate_abort"] # Required for older ESP-IDF versions without a realpath implementation
+
+[env]
+# Note: these variables are not used when using pio builder
+# Enables the esp-idf-sys "native" build feature (`cargo build --features native`) to build against ESP-IDF stable (v4.4)
+ESP_IDF_VERSION = { value = "branch:release/v4.4" }
+# Enables the esp-idf-sys "native" build feature (`cargo build --features native`) to build against ESP-IDF master (mainline)
+#ESP_IDF_VERSION = { value = "master" }

.gitignore

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+/.vscode
+/.embuild
+/target
+/Cargo.lock

Cargo.toml

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+[package]
+name = "sphinx-key"
+version = "0.1.0"
+authors = ["Evan Feenstra <evanfeenstra@gmail.com>"]
+edition = "2018"
+resolver = "2"
+
+[profile.release]
+opt-level = "s"
+
+[profile.dev]
+debug = true # Symbols are nice and they don't increase the size on Flash
+opt-level = "z"
+
+[features]
+pio = ["esp-idf-sys/pio"]
+
+[dependencies]
+esp-idf-sys = { version = "0.31.5", features = ["binstart"] }
+
+
+[build-dependencies]
+embuild = "0.29"
+anyhow = "1"

README.md

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+# sphinx-key
+
+### deps
+
+##### cargo nightly:
+
+`rustup install nightly`
+
+`rustup component add rust-src --toolchain nightly`
+
+##### python 3.7 or higher is required
+
+##### cargo sub-commands
+
+`cargo install cargo-generate`
+
+`cargo install ldproxy`
+
+`cargo install espflash`
+
+`cargo install espmonitor`
+
+### build
+
+`cargo build`
+
+### flash
+
+`espflash /dev/ttyUSB0 target/riscv32imc-esp-espidf/debug/sphinx-key`
+
+replace dev/ttyUSB0 with the usb where board is connected

build.rs

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+// Necessary because of this issue: https://github.com/rust-lang/cargo/issues/9641
+fn main() -> anyhow::Result<()> {
+    embuild::build::CfgArgs::output_propagated("ESP_IDF")?;
+    embuild::build::LinkArgs::output_propagated("ESP_IDF")
+}

rust-toolchain.toml

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+[toolchain]
+
+channel = "nightly"

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=7000
+
+# Use this to set FreeRTOS kernel tick frequency to 1000 Hz (100 Hz by default).
+# This allows to use 1 ms granuality 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

src/main.rs

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+use esp_idf_sys as _; // If using the `binstart` feature of `esp-idf-sys`, always keep this module imported
+
+fn main() {
+    // Temporary. Will disappear once ESP-IDF 4.4 is released, but for now it is necessary to call this function once,
+    // or else some patches to the runtime implemented by esp-idf-sys might not link properly.
+    esp_idf_sys::link_patches();
+
+    println!("Hello, world!");
+}