targets: add support for Pimoroni Tiny2350 board

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

GNUmakefile

@@ -743,6 +743,8 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pico2               examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=tiny2350            examples/blinky1
+	@$(MD5SUM) test.hex
 	# test pwm
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m0        examples/pwm
 	@$(MD5SUM) test.hex

src/machine/board_tiny2350.go

@@ -0,0 +1,82 @@
+//go:build tiny2350
+
+package machine
+
+// GPIO pins
+const (
+	GP0  Pin = GPIO0
+	GP1  Pin = GPIO1
+	GP2  Pin = GPIO2
+	GP3  Pin = GPIO3
+	GP4  Pin = GPIO4
+	GP5  Pin = GPIO5
+	GP6  Pin = GPIO6
+	GP7  Pin = GPIO7
+	GP12 Pin = GPIO12
+	GP13 Pin = GPIO13
+	GP18 Pin = GPIO18
+	GP19 Pin = GPIO19
+	GP20 Pin = GPIO20
+	GP26 Pin = GPIO26
+	GP27 Pin = GPIO27
+	GP28 Pin = GPIO28
+	GP29 Pin = GPIO29
+
+	// Onboard LED
+	LED_RED   Pin = GPIO18
+	LED_GREEN Pin = GPIO19
+	LED_BLUE  Pin = GPIO20
+	LED           = LED_RED
+
+	// Onboard crystal oscillator frequency, in MHz.
+	xoscFreq = 12 // MHz
+)
+
+// I2C Default pins on Tiny2350.
+const (
+	I2C0_SDA_PIN = GP12
+	I2C0_SCL_PIN = GP13
+
+	I2C1_SDA_PIN = GP2
+	I2C1_SCL_PIN = GP3
+)
+
+// SPI default pins
+const (
+	// Default Serial Clock Bus 0 for SPI communications
+	SPI0_SCK_PIN = GPIO6
+	// Default Serial Out Bus 0 for SPI communications
+	SPI0_SDO_PIN = GPIO7 // Tx
+	// Default Serial In Bus 0 for SPI communications
+	SPI0_SDI_PIN = GPIO4 // Rx
+
+	// Default Serial Clock Bus 1 for SPI communications
+	SPI1_SCK_PIN = GPIO26
+	// Default Serial Out Bus 1 for SPI communications
+	SPI1_SDO_PIN = GPIO27 // Tx
+	// Default Serial In Bus 1 for SPI communications
+	SPI1_SDI_PIN = GPIO28 // Rx
+)
+
+// UART pins
+const (
+	UART0_TX_PIN = GPIO0
+	UART0_RX_PIN = GPIO1
+	UART1_TX_PIN = GPIO4
+	UART1_RX_PIN = GPIO5
+	UART_TX_PIN  = UART0_TX_PIN
+	UART_RX_PIN  = UART0_RX_PIN
+)
+
+var DefaultUART = UART0
+
+// USB identifiers
+const (
+	usb_STRING_PRODUCT      = "Tiny2350"
+	usb_STRING_MANUFACTURER = "Pimoroni"
+)
+
+var (
+	usb_VID uint16 = 0x2E8A
+	usb_PID uint16 = 0x000F
+)

targets/tiny2350.json

@@ -0,0 +1,7 @@
+{
+    "inherits": [
+        "rp2350"
+    ],
+    "build-tags": ["tiny2350"],
+    "serial-port": ["2e8a:000f"]
+}