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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>
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‎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 Pin = GPIO0
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GP1 Pin = GPIO1
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GP2 Pin = GPIO2
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GP3 Pin = GPIO3
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GP4 Pin = GPIO4
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GP5 Pin = GPIO5
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GP6 Pin = GPIO6
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GP7 Pin = GPIO7
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GP8 Pin = GPIO8
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GP9 Pin = GPIO9
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GP10 Pin = GPIO10
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GP11 Pin = GPIO11
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GP12 Pin = GPIO12
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GP13 Pin = GPIO13
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GP14 Pin = GPIO14
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GP15 Pin = GPIO15
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GP16 Pin = GPIO16
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GP17 Pin = GPIO17
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GP18 Pin = GPIO18
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GP19 Pin = GPIO19
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GP20 Pin = GPIO20
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GP21 Pin = GPIO21
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GP22 Pin = GPIO22
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GP23 Pin = GPIO23
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GP24 Pin = GPIO24
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GP25 Pin = GPIO25
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GP26 Pin = GPIO26
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GP27 Pin = GPIO27
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GP28 Pin = GPIO28
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GP29 Pin = GPIO29
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GP30 Pin = 30
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GP31 Pin = 31
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GP32 Pin = 32
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GP33 Pin = 33
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GP34 Pin = 34
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GP35 Pin = 35
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GP36 Pin = 36
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GP37 Pin = 37
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GP38 Pin = 38
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GP39 Pin = 39
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GP40 Pin = 40
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GP41 Pin = 41
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GP42 Pin = 42
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GP43 Pin = 43
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GP44 Pin = 44
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GP45 Pin = 45
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GP46 Pin = 46
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GP47 Pin = 47
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// RPi pins shared with ICE
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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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FPGA_RSTN = GP31
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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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RED Pin = GP1
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GREEN Pin = GP0
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BLUE Pin = GP9
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// Onboard LED
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LED Pin = 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 Pin = 0
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I2C0_SCL_PIN Pin = 0
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I2C1_SDA_PIN Pin = 0
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I2C1_SCL_PIN Pin = 0
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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
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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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config.SDI = SPI1_SDI_PIN
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}
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}
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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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if err := spi.validPins(config); err != nil {
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return err
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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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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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