Support for the Espressif ESP32-C3-DevKit-RUST-1 development board

Signed-off-by: John Clark <inindev@gmail.com>

src/machine/board_esp32-c3-devkit-rust-1.go

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+//go:build esp32_c3_devkit_rust_1
+
+// This file contains the pin mappings for the Espressif ESP32-C3 Development Board for Rust.
+//
+// The Espressif ESP32-C3-DevKit-RUST-1 development board is powered
+// by the Espressif ESP32-C3 SoC featuring an open-source RISC-V architecture.
+//
+// Specifications:
+//   SoC: ESP32-C3-MINI-1, 4MB Flash, RISCV-32bit, 160MHz, 400KB SRAM
+//   Wireless: WiFi & Bluetooth 5.0 (BLE)
+//   ICM-42670-P 6-Axis IMU  (I2C Addr 0x68)
+//   SHTC3 Humidity and Temperature Sensor (I2C Addr 0x70)
+//   WS2812B LED
+
+// GitHub:    https://github.com/esp-rs/esp-rust-board
+// Schematic: https://github.com/esp-rs/esp-rust-board/blob/master/hardware/esp-rust-board/schematic/esp-rust-board.pdf
+// Datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf
+
+package machine
+
+// Digital pins
+const (
+	//    Pin    // Function
+	//    -----  // ---------------
+	D0  = GPIO0  //
+	D1  = GPIO1  //
+	D2  = GPIO2  // WS2812
+	D3  = GPIO3  //
+	D4  = GPIO4  // MTMS
+	D5  = GPIO5  // MTDI
+	D6  = GPIO6  // MTCK
+	D7  = GPIO7  // Red LED / MTDO
+	D8  = GPIO8  // I2C SCL
+	D9  = GPIO9  // Boot Button
+	D10 = GPIO10 // I2C SDA
+	D18 = GPIO18 // USB DM
+	D19 = GPIO19 // USB DP
+	D20 = GPIO20 // UART RX
+	D21 = GPIO21 // UART TX
+)
+
+// Analog pins
+const (
+	A0 = GPIO0
+	A1 = GPIO1
+	A2 = GPIO2
+	A3 = GPIO3
+	A4 = GPIO4
+	A5 = GPIO5
+)
+
+// Button pin
+const (
+	BUTTON      = BUTTON_BOOT
+	BUTTON_BOOT = D9
+)
+
+// LED pins
+const (
+	LED         = LED_BUILTIN
+	WS2812      = D2
+	LED_BUILTIN = D7
+)
+
+// I2C pins
+const (
+	I2C_SCL_PIN = D8
+	I2C_SDA_PIN = D10
+)
+
+// USBCDC pins
+const (
+	USBCDC_DM_PIN = D18
+	USBCDC_DP_PIN = D19
+)
+
+// UART pins
+const (
+	UART_RX_PIN = D20
+	UART_TX_PIN = D21
+)

targets/esp32-c3-devkit-rust-1.json

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+{
+	"inherits": ["esp32c3"],
+	"build-tags": ["esp32_c3_devkit_rust_1"]
+}