initial

.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"
+runner = "espflash --monitor"
+#rustflags = ["--cfg", "espidf_time64"] # Extending time_t for ESP IDF 5: https://github.com/esp-rs/rust/issues/110
+
+[target.xtensa-esp32s2-espidf]
+linker = "ldproxy"
+runner = "espflash --monitor"
+#rustflags = ["--cfg", "espidf_time64"] # Extending time_t for ESP IDF 5: https://github.com/esp-rs/rust/issues/110
+
+[target.xtensa-esp32s3-espidf]
+linker = "ldproxy"
+runner = "espflash --monitor"
+#rustflags = ["--cfg", "espidf_time64"] # Extending time_t for ESP IDF 5: https://github.com/esp-rs/rust/issues/110
+
+[target.riscv32imc-esp-espidf]
+linker = "ldproxy"
+runner = "espflash --monitor"
+# Future - necessary for the experimental "native build" of esp-idf-sys with ESP32C3. See also https://github.com/ivmarkov/embuild/issues/16
+# For ESP-IDF 5 add `espidf_time64` and for earlier versions - remove this flag: https://github.com/esp-rs/rust/issues/110
+#rustflags = ["-C", "default-linker-libraries"]
+rustflags = ["--cfg", "espidf_time64", "-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 (`cargo build --features pio`)
+# Builds against ESP-IDF stable (v4.4)
+ESP_IDF_VERSION = "release/v5.1"
+# Builds against ESP-IDF master (mainline)
+#ESP_IDF_VERSION = "master"