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Create "pico2-ice" target board (#5062)
* Create "pico2-ice" target board This board has an rp2350b chip on it, as well as a Lattice Semiconductor iCE40UP5K FPGA. More details of this open hardware board here: https://pico2-ice.tinyvision.ai/ Tested on a pico2-ice board with: ~/go/bin/tinygo flash -target=pico2-ice src/examples/blinky1/blinky1.go which blinks the GREEN LED (connected to GPIO0) on this board. Signed-off-by: Tinkerer <tinkerer@zappem.net> * More silkscreen labels for pico2-ice board Reading the schematic and the rev2 board viewer: https://raw.githubusercontent.com/tinyvision-ai-inc/pico2-ice/refs/heads/main/Board/Rev2/bom/ibom.html concluded that the RP2350B GPIO pins are not labeled with these pin numbers in the silkscreen. Instead, the silkscreen refers to uses of the GPIOs or the ICE numbered pins. RP2340B devoted pins map to the A1..4 B1..4 pins on the RP PMOD connector. Also silkscreen "~0".."~6" are labeled as pins N0..N6. Signed-off-by: Tinkerer <tinkerer@zappem.net> * Added a smoketest for pico2-ice board and tidied up GPIO defs Addresses review comments from aykevl. Signed-off-by: Tinkerer <tinkerer@zappem.net>
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‎GNUmakefile‎

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@@ -621,6 +621,8 @@ smoketest: testchdir
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@$(MD5SUM) test.hex
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$(TINYGO) build -size short -o test.hex -target=feather-rp2040 examples/device-id
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@$(MD5SUM) test.hex
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$(TINYGO) build -size short -o test.hex -target=pico2-ice examples/blinky1
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@$(MD5SUM) test.hex
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# test simulated boards on play.tinygo.org
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ifneq ($(WASM), 0)
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GOOS=js GOARCH=wasm $(TINYGO) build -size short -o test.wasm -tags=arduino examples/blinky1

‎src/machine/board_pico2_ice.go‎

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//go:build pico2_ice
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// Most of the info is from
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// https://pico2-ice.tinyvision.ai/md_pinout.html although
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// (2025-09-07) RP4 appears twice in that pinout - the schematic is
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// more clear. Consistent with other RPi boards, we use GPn instead of
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// RPn to reference the RPi connected pins.
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package machine
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// GPIO pins
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const (
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GP0 = GPIO0
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GP1 = GPIO1
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GP2 = GPIO2
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GP3 = GPIO3
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GP4 = GPIO4
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GP5 = GPIO5
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GP6 = GPIO6
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GP7 = GPIO7
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GP8 = GPIO8
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GP9 = GPIO9
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GP10 = GPIO10
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GP11 = GPIO11
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GP12 = GPIO12
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GP13 = GPIO13
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GP14 = GPIO14
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GP15 = GPIO15
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GP16 = GPIO16
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GP17 = GPIO17
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GP18 = GPIO18
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GP19 = GPIO19
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GP20 = GPIO20
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GP21 = GPIO21
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GP22 = GPIO22
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GP23 = GPIO23
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GP24 = GPIO24
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GP25 = GPIO25
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GP26 = GPIO26
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GP27 = GPIO27
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GP28 = GPIO28
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GP29 = GPIO29
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GP30 = GPIO30
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GP31 = GPIO31
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GP32 = GPIO32
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GP33 = GPIO33
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GP34 = GPIO34
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GP35 = GPIO35
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GP36 = GPIO36
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GP37 = GPIO37
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GP38 = GPIO38
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GP39 = GPIO39
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GP40 = GPIO40
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GP41 = GPIO41
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GP42 = GPIO42
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GP43 = GPIO43
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GP44 = GPIO44
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GP45 = GPIO45
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GP46 = GPIO46
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GP47 = GPIO47
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// RPi pins shared with ICE. The ICE number is what appears on
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// the board silkscreen.
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ICE9 = GP28
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ICE11 = GP29
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ICE14 = GP7
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ICE15 = GP6
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ICE16 = GP5
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ICE17 = GP4
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ICE18 = GP27
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ICE19 = GP23
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ICE20 = GP22
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ICE21 = GP26
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ICE23 = GP25
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ICE25 = GP30
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ICE26 = GP24
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ICE27 = GP20
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// FPGA Clock pin.
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ICE35_G0 = GP21
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// Silkscreen & Pinout names
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ICE_SSN = ICE16
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ICE_SO = ICE14
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ICE_SI = ICE17
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ICE_CK = ICE15
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SD = GP2
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SC = GP3
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FPGA_RSTN = GP31
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A3 = GP32
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A1 = GP33
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A4 = GP34
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A2 = GP35
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B3 = GP36
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B1 = GP37
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B4 = GP38
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B2 = GP39
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N0 = GP40 // On the board these are labeled "~0"
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N1 = GP41
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N2 = GP42
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N3 = GP43
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N4 = GP44
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N5 = GP45
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N6 = GP46
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// Functions from Schematic.
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ICE_DONE = GP40
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USB_BOOT = GP42
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// Button
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SW1 = GP42
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BOOTSEL = GP42
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// Tricolor LEDs
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LED_RED = GP1
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LED_GREEN = GP0
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LED_BLUE = GP9
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// Onboard LED
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LED = LED_GREEN
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// Onboard crystal oscillator frequency, in MHz.
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xoscFreq = 12 // MHz
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)
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// This board does not define default i2c pins.
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const (
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I2C0_SDA_PIN = NoPin
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I2C0_SCL_PIN = NoPin
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I2C1_SDA_PIN = NoPin
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I2C1_SCL_PIN = NoPin
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)
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// SPI default pins
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const (
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// Default Serial Clock Bus 0 for SPI communications
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SPI0_SCK_PIN = GPIO18
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// Default Serial Out Bus 0 for SPI communications
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SPI0_SDO_PIN = GPIO19 // Tx
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// Default Serial In Bus 0 for SPI communications
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SPI0_SDI_PIN = GPIO16 // Rx
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// Default Serial Clock Bus 1 for SPI communications
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SPI1_SCK_PIN = GPIO10
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// Default Serial Out Bus 1 for SPI communications
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SPI1_SDO_PIN = GPIO11 // Tx
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// Default Serial In Bus 1 for SPI communications
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SPI1_SDI_PIN = GPIO12 // Rx
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)
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// UART pins
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const (
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UART0_TX_PIN = GPIO0
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UART0_RX_PIN = GPIO1
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UART1_TX_PIN = GPIO8
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UART1_RX_PIN = GPIO9
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UART_TX_PIN = UART0_TX_PIN
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UART_RX_PIN = UART0_RX_PIN
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)
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var DefaultUART = UART0
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// USB identifiers
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const (
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usb_STRING_PRODUCT = "Pico2"
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usb_STRING_MANUFACTURER = "Raspberry Pi"
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)
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var (
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usb_VID uint16 = 0x2E8A
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usb_PID uint16 = 0x000A
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)

‎src/machine/machine_rp2_2040.go‎

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@@ -124,6 +124,31 @@ const (
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fnXIP pinFunc = 0
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)
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// validPins confirms that the SPI pin selection is a legitimate one
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// for the the 2040 chip.
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func (spi *SPI) validPins(config SPIConfig) error {
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var okSDI, okSDO, okSCK bool
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switch spi.Bus {
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case rp.SPI0:
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okSDI = config.SDI == 0 || config.SDI == 4 || config.SDI == 16 || config.SDI == 20
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okSDO = config.SDO == 3 || config.SDO == 7 || config.SDO == 19 || config.SDO == 23
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okSCK = config.SCK == 2 || config.SCK == 6 || config.SCK == 18 || config.SCK == 22
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case rp.SPI1:
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okSDI = config.SDI == 8 || config.SDI == 12 || config.SDI == 24 || config.SDI == 28
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okSDO = config.SDO == 11 || config.SDO == 15 || config.SDO == 27
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okSCK = config.SCK == 10 || config.SCK == 14 || config.SCK == 26
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}
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switch {
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case !okSDI:
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return errSPIInvalidSDI
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case !okSDO:
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return errSPIInvalidSDO
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case !okSCK:
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return errSPIInvalidSCK
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}
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return nil
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}
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// Configure configures the gpio pin as per mode.
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func (p Pin) Configure(config PinConfig) {
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if p == NoPin {

‎src/machine/machine_rp2_2350a.go‎

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package machine
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import "device/rp"
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// Analog pins on RP2350a.
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const (
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ADC0 Pin = GPIO26
@@ -12,3 +14,28 @@ const (
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// fifth ADC channel.
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thermADC = 30
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)
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// validPins confirms that the SPI pin selection is a legitimate one
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// for the the 2350a chip.
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func (spi *SPI) validPins(config SPIConfig) error {
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var okSDI, okSDO, okSCK bool
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switch spi.Bus {
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case rp.SPI0:
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okSDI = config.SDI == 0 || config.SDI == 4 || config.SDI == 16 || config.SDI == 20
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okSDO = config.SDO == 3 || config.SDO == 7 || config.SDO == 19 || config.SDO == 23
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okSCK = config.SCK == 2 || config.SCK == 6 || config.SCK == 18 || config.SCK == 22
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case rp.SPI1:
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okSDI = config.SDI == 8 || config.SDI == 12 || config.SDI == 24 || config.SDI == 28
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okSDO = config.SDO == 11 || config.SDO == 15 || config.SDO == 27
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okSCK = config.SCK == 10 || config.SCK == 14 || config.SCK == 26
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}
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switch {
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case !okSDI:
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return errSPIInvalidSDI
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case !okSDO:
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return errSPIInvalidSDO
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case !okSCK:
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return errSPIInvalidSCK
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}
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return nil
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}

‎src/machine/machine_rp2_2350b.go‎

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package machine
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import "device/rp"
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// RP2350B has additional pins.
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const (
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PWM10 = getPWMGroup(10)
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PWM11 = getPWMGroup(11)
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)
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// validPins confirms that the SPI pin selection is a legitimate one
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// for the the 2350b chip.
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func (spi *SPI) validPins(config SPIConfig) error {
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var okSDI, okSDO, okSCK bool
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switch spi.Bus {
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case rp.SPI0:
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okSDI = config.SDI == 0 || config.SDI == 4 || config.SDI == 16 || config.SDI == 20 || config.SDI == 32 || config.SDI == 36
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okSDO = config.SDO == 3 || config.SDO == 7 || config.SDO == 19 || config.SDO == 23 || config.SDO == 35 || config.SDO == 39
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okSCK = config.SCK == 2 || config.SCK == 6 || config.SCK == 18 || config.SCK == 22 || config.SCK == 34 || config.SCK == 38
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case rp.SPI1:
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okSDI = config.SDI == 8 || config.SDI == 12 || config.SDI == 24 || config.SDI == 28 || config.SDI == 40 || config.SDI == 44
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okSDO = config.SDO == 11 || config.SDO == 15 || config.SDO == 27 || config.SDO == 31 || config.SDO == 43 || config.SDO == 47
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okSCK = config.SCK == 10 || config.SCK == 14 || config.SCK == 26 || config.SCK == 30 || config.SCK == 42 || config.SCK == 46
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}
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switch {
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case !okSDI:
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return errSPIInvalidSDI
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case !okSDO:
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return errSPIInvalidSDO
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case !okSCK:
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return errSPIInvalidSCK
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}
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return nil
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}

‎src/machine/machine_rp2_spi.go‎

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@@ -165,27 +165,9 @@ func (spi *SPI) Configure(config SPIConfig) error {
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config.SDI = SPI1_SDI_PIN
166166
}
167167
}
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var okSDI, okSDO, okSCK bool
169-
switch spi.Bus {
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case rp.SPI0:
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okSDI = config.SDI == 0 || config.SDI == 4 || config.SDI == 16 || config.SDI == 20
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okSDO = config.SDO == 3 || config.SDO == 7 || config.SDO == 19 || config.SDO == 23
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okSCK = config.SCK == 2 || config.SCK == 6 || config.SCK == 18 || config.SCK == 22
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case rp.SPI1:
175-
okSDI = config.SDI == 8 || config.SDI == 12 || config.SDI == 24 || config.SDI == 28
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okSDO = config.SDO == 11 || config.SDO == 15 || config.SDO == 27
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okSCK = config.SCK == 10 || config.SCK == 14 || config.SCK == 26
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if err := spi.validPins(config); err != nil {
169+
return err
178170
}
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switch {
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case !okSDI:
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return errSPIInvalidSDI
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case !okSDO:
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return errSPIInvalidSDO
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case !okSCK:
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return errSPIInvalidSCK
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}
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if config.Frequency == 0 {
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config.Frequency = defaultBaud
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}

‎targets/pico2-ice.json‎

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{
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"inherits": [
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"rp2350b"
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],
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"build-tags": ["pico2_ice"],
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"serial-port": ["2e8a:000A"],
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"default-stack-size": 8192,
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"ldflags": [
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"--defsym=__flash_size=4M"
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]
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}

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