targets: add Adafruit qtpy-esp32c3 board support

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/machine/board_qtpy_esp32c3.go

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+//go:build qtpy_esp32c3
+
+// This file contains the pin mappings for the Adafruit QtPy ESP32C3 boards.
+//
+// https://learn.adafruit.com/adafruit-qt-py-esp32-c3-wifi-dev-board/pinouts
+package machine
+
+// Digital Pins
+const (
+	D0 = GPIO4
+	D1 = GPIO3
+	D2 = GPIO1
+	D3 = GPIO0
+)
+
+// Analog pins (ADC1)
+const (
+	A0 = GPIO4
+	A1 = GPIO3
+	A2 = GPIO1
+	A3 = GPIO0
+)
+
+// UART pins
+const (
+	RX_PIN = GPIO20
+	TX_PIN = GPIO21
+
+	UART_RX_PIN = RX_PIN
+	UART_TX_PIN = TX_PIN
+)
+
+// I2C pins
+const (
+	SDA_PIN = GPIO5
+	SCL_PIN = GPIO6
+
+	I2C0_SDA_PIN = SDA_PIN
+	I2C0_SCL_PIN = SCL_PIN
+)
+
+// SPI pins
+const (
+	SCK_PIN = GPIO10
+	MI_PIN  = GPIO8
+	MO_PIN  = GPIO7
+
+	SPI_SCK_PIN = SCK_PIN
+	SPI_SDI_PIN = MI_PIN
+	SPI_SDO_PIN = MO_PIN
+)
+
+const (
+	NEOPIXEL = GPIO2
+	WS2812   = GPIO2
+
+	// also used for boot button.
+	// set it to be an input-with-pullup
+	BUTTON = GPIO9
+)

targets/qtpy-esp32c3.json

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+{
+	"inherits": ["esp32c3"],
+	"build-tags": ["qtpy_esp32c3"]
+}