Add Pimoroni's Tufty2040 board

Makefile

@@ -589,6 +589,8 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=badger2040          examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=tufty2040           examples/blinky1
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=thingplus-rp2040    examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=xiao-rp2040         examples/blinky1

README.md

@@ -43,7 +43,7 @@ See the [getting started instructions](https://tinygo.org/getting-started/) for
 
 You can compile TinyGo programs for microcontrollers, WebAssembly and Linux.
 
-The following 88 microcontroller boards are currently supported:
+The following 89 microcontroller boards are currently supported:
 
 * [Adafruit Circuit Playground Bluefruit](https://www.adafruit.com/product/4333)
 * [Adafruit Circuit Playground Express](https://www.adafruit.com/product/3333)
@@ -108,6 +108,7 @@ The following 88 microcontroller boards are currently supported:
 * [Particle Xenon](https://docs.particle.io/datasheets/discontinued/xenon-datasheet/)
 * [Phytec reel board](https://www.phytec.eu/product-eu/internet-of-things/reelboard/)
 * [Pimoroni Badger2040](https://shop.pimoroni.com/products/badger-2040)
+* [Pimoroni Tufty2040](https://shop.pimoroni.com/products/tufty-2040)
 * [PineTime DevKit](https://www.pine64.org/pinetime/)
 * [PJRC Teensy 3.6](https://www.pjrc.com/store/teensy36.html)
 * [PJRC Teensy 4.0](https://www.pjrc.com/store/teensy40.html)

src/machine/board_tufty2040.go

@@ -0,0 +1,105 @@
+//go:build tufty2040
+// +build tufty2040
+
+// This contains the pin mappings for the Badger 2040 Connect board.
+//
+// For more information, see: https://shop.pimoroni.com/products/tufty-2040
+// Also
+// - Tufty 2040 schematic: https://cdn.shopify.com/s/files/1/0174/1800/files/tufty_schematic.pdf?v=1655385675
+//
+package machine
+
+import (
+	"device/rp"
+	"runtime/interrupt"
+)
+
+const (
+	LED Pin = GPIO25
+
+	BUTTON_A    Pin = GPIO7
+	BUTTON_B    Pin = GPIO8
+	BUTTON_C    Pin = GPIO9
+	BUTTON_UP   Pin = GPIO22
+	BUTTON_DOWN Pin = GPIO6
+	BUTTON_USER Pin = GPIO23
+
+	LCD_BACKLIGHT Pin = GPIO2
+	LCD_CS        Pin = GPIO10
+	LCD_DC        Pin = GPIO11
+	LCD_WR        Pin = GPIO12
+	LCD_RD        Pin = GPIO13
+	LCD_DB0       Pin = GPIO14
+	LCD_DB1       Pin = GPIO15
+	LCD_DB2       Pin = GPIO16
+	LCD_DB3       Pin = GPIO17
+	LCD_DB4       Pin = GPIO18
+	LCD_DB5       Pin = GPIO19
+	LCD_DB6       Pin = GPIO20
+	LCD_DB7       Pin = GPIO21
+
+	VBUS_DETECT  Pin = GPIO24
+	BATTERY      Pin = GPIO29
+	USER_LED     Pin = GPIO25
+	LIGHT_SENSE  Pin = GPIO26
+	SENSOR_POWER Pin = GPIO27
+)
+
+// I2C pins
+const (
+	I2C0_SDA_PIN Pin = GPIO4
+	I2C0_SCL_PIN Pin = GPIO5
+
+	I2C1_SDA_PIN Pin = NoPin
+	I2C1_SCL_PIN Pin = NoPin
+)
+
+// SPI pins.
+const (
+	SPI0_SCK_PIN Pin = NoPin
+	SPI0_SDO_PIN Pin = NoPin
+	SPI0_SDI_PIN Pin = NoPin
+
+	SPI1_SCK_PIN Pin = NoPin
+	SPI1_SDO_PIN Pin = NoPin
+	SPI1_SDI_PIN Pin = NoPin
+)
+
+// Onboard crystal oscillator frequency, in MHz.
+const (
+	xoscFreq = 12 // MHz
+)
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "Tufty 2040"
+	usb_STRING_MANUFACTURER = "Pimoroni"
+)
+
+var (
+	usb_VID uint16 = 0x2e8a
+	usb_PID uint16 = 0x1002
+)
+
+// UART pins
+const (
+	UART0_TX_PIN = GPIO0
+	UART0_RX_PIN = GPIO1
+	UART_TX_PIN  = UART0_TX_PIN
+	UART_RX_PIN  = UART0_RX_PIN
+)
+
+// UART on the RP2040
+var (
+	UART0  = &_UART0
+	_UART0 = UART{
+		Buffer: NewRingBuffer(),
+		Bus:    rp.UART0,
+	}
+)
+
+var DefaultUART = UART0
+
+func init() {
+	UART0.Interrupt = interrupt.New(rp.IRQ_UART0_IRQ, _UART0.handleInterrupt)
+}

targets/tufty2040.json

@@ -0,0 +1,11 @@
+{
+    "inherits": [
+        "rp2040"
+    ],
+    "serial-port": ["acm:2e8a:0003"],
+    "build-tags": ["tufty2040"],
+    "linkerscript": "targets/tufty2040.ld",
+    "extra-files": [
+        "targets/pico-boot-stage2.S"
+    ]
+}

targets/tufty2040.ld

@@ -0,0 +1,10 @@
+
+MEMORY
+{
+    /* Reserve exactly 256 bytes at start of flash for second stage bootloader */
+    BOOT2_TEXT (rx) : ORIGIN = 0x10000000, LENGTH = 256
+    FLASH_TEXT (rx) : ORIGIN = 0x10000000 + 256, LENGTH = 1020K - 256
+    RAM (rwx)       : ORIGIN = 0x20000000, LENGTH = 256k
+}
+
+INCLUDE "targets/rp2040.ld"