Add Pimoroni's Tufty2040 board

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)
+}