add board: esp32c3-supermini

GNUmakefile

@@ -822,6 +822,8 @@ endif
 ifneq ($(XTENSA), 0)
 	$(TINYGO) build -size short -o test.bin -target=esp32-mini32      	examples/blinky1
 	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target=esp32c3-supermini   examples/blinky1
+	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=nodemcu             examples/blinky1
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target m5stack-core2       examples/machinetest

src/machine/board_esp32c3-supermini.go

@@ -0,0 +1,57 @@
+//go:build esp32c3_supermini
+
+// This file contains the pin mappings for the ESP32 supermini boards.
+//
+// - https://forum.arduino.cc/t/esp32-c3-supermini-pinout/1189850/7
+
+package machine
+
+// Digital Pins
+const (
+	IO0  = GPIO0
+	IO1  = GPIO1
+	IO2  = GPIO2
+	IO3  = GPIO3
+	IO4  = GPIO4
+	IO5  = GPIO5
+	IO6  = GPIO6
+	IO7  = GPIO7
+	IO8  = GPIO8
+	IO9  = GPIO9
+	IO10 = GPIO10
+	IO20 = GPIO20
+	IO21 = GPIO21
+)
+
+// Built-in LED
+const LED = GPIO8
+
+// Analog pins
+const (
+	A0 = GPIO0
+	A1 = GPIO1
+	A2 = GPIO2
+	A3 = GPIO3
+	A4 = GPIO4
+	A5 = GPIO5
+)
+
+// UART pins
+const (
+	UART_RX_PIN = GPIO20
+	UART_TX_PIN = GPIO21
+)
+
+// I2C pins
+const (
+	SDA_PIN = GPIO8
+	SCL_PIN = GPIO9
+)
+
+// SPI pins
+const (
+	SPI_MISO_PIN = GPIO5
+	SPI_MOSI_PIN = GPIO6
+	SPI_SS_PIN   = GPIO7
+	SPI_SCK_PIN  = GPIO4
+)

targets/esp32c3-supermini.json

@@ -0,0 +1,4 @@
+{
+  "inherits": ["esp32c3"],
+  "build-tags": ["esp32c3_supermini"]
+}