Support for Makerfabs ESP32C3SPI35 TFT Touchscreen board

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

src/machine/board_makerfabs-esp32c3spi35.go

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+//go:build makerfabs_esp32c3spi35
+
+// This file contains the pin mappings for the Makerfabs ESP32C3SPI35 board.
+//
+// The Makerfabs ESP32C3SPI35 is an LCD Touchscreen development board powered
+// by the Espressif ESP32-C3 SoC featuring an open-source RISC-V architecture.
+//
+// Specifications:
+//   SoC: ESP32-C3-MINI-1-N4, 4MB Flash, RISCV-32bit, 160MHz, 400KB SRAM
+//   Wireless: WiFi & Bluetooth 5.0 (BLE)
+//   LCD: 3.5inch TFT LCD (480x320)
+//   LCD Driver: ILI9488 SPI
+//   Touch Panel: Capacitive
+//   Touch Panel Driver: FT6236
+//   MicroSD Card Slot
+//   Mabee Interface
+//   Dual USB Type-C (one for USB-to-UART and one for native USB)
+//
+// Website:   https://www.makerfabs.com/ep32-c3-risc-v-spi-tft-touch.html
+// Wiki:      https://wiki.makerfabs.com/ESP32_C3_SPI_3.5_TFT_with_Touch.html
+// GitHub:    https://github.com/Makerfabs/Makerfabs-ESP32-C3-SPI-TFT-with-Touch
+// Schematic: https://github.com/Makerfabs/Makerfabs-ESP32-C3-SPI-TFT-with-Touch/raw/main/Hardware/ESP32-C3%20TFT%20Touch%20v1.1(3.5''%20ili9488).PDF
+// Datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-c3-mini-1_datasheet_en.pdf
+
+package machine
+
+// Digital pins
+const (
+	//    Pin    // Function
+	//    -----  // ---------------------
+	D0  = GPIO0  // Touchscreen CS
+	D1  = GPIO1  // MicroSD CS
+	D2  = GPIO2  // I2C SDA
+	D3  = GPIO3  // I2C SCL
+	D4  = GPIO4  // SPI CS
+	D5  = GPIO5  // SPI SCK
+	D6  = GPIO6  // SPI SDO
+	D7  = GPIO7  // SPI SDI
+	D8  = GPIO8  // Touchscreen Backlight
+	D9  = GPIO9  // Boot Button
+	D10 = GPIO10 // TFT D/C
+	D18 = GPIO18 // USB DM
+	D19 = GPIO19 // USB DP
+	D20 = GPIO20 // UART RX
+	D21 = GPIO21 // UART TX
+)
+
+// Button pin
+const (
+	BUTTON      = BUTTON_BOOT
+	BUTTON_BOOT = D9
+)
+
+// TFT pins
+const (
+	TFT_BL_PIN  = D8
+	TFT_CS_PIN  = SPI_CS_PIN
+	TFT_DC_PIN  = D10
+	TFT_SCK_PIN = SPI_SCK_PIN
+	TFT_SDI_PIN = SPI_SDI_PIN
+	TFT_SDO_PIN = SPI_SDO_PIN
+)
+
+// Touchscreen pins
+const (
+	TS_CS_PIN  = D0
+	TS_SDA_PIN = I2C_SDA_PIN
+	TS_SCL_PIN = I2C_SCL_PIN
+)
+
+// MicroSD pins
+const (
+	SD_CS_PIN  = D1
+	SD_SCK_PIN = SPI_SCK_PIN
+	SD_SDI_PIN = SPI_SDI_PIN
+	SD_SDO_PIN = SPI_SDO_PIN
+)
+
+// USBCDC pins
+const (
+	USBCDC_DM_PIN = D18
+	USBCDC_DP_PIN = D19
+)
+
+// UART pins
+const (
+	UART_RX_PIN = D20
+	UART_TX_PIN = D21
+)
+
+// I2C pins
+const (
+	I2C_SDA_PIN = D2
+	I2C_SCL_PIN = D3
+)
+
+// SPI pins
+const (
+	SPI_CS_PIN  = D4
+	SPI_SCK_PIN = D5
+	SPI_SDI_PIN = D7
+	SPI_SDO_PIN = D6
+)

targets/makerfabs-esp32c3spi35.json

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+{
+	"inherits": ["esp32c3"],
+	"build-tags": ["makerfabs_esp32c3spi35"]
+}