Vicharak Shrike-Lite

The Vicharak Shrike-Lite is a tiny development board based on the Raspberry Pi RP2040 microcontroller paired with a Renesas ForgeFPGA SLG47910V FPGA.

Interfaces

Pins

Machine Package Docs

Documentation for the machine package for Shrike-Lite

Flashing

UF2

The board comes with the UF2 bootloader already installed.

CLI Flashing

• Put your board into Bootloader mode

• Flash your TinyGo program to the board using this command:

  tinygo flash -target=vicharak_shrike-lite [PATH TO YOUR PROGRAM]
  

• The board should restart and then begin running your program.

Flashing the FPGA

An SPI interface should be configured at specific pins in order to flash the FPGA

	machine.SPI0.Configure(machine.SPIConfig{
		SDO:       machine.IO3, // MOSI
		SDI:       machine.IO0, // MISO
		SCK:       machine.IO2,
		Frequency: 1600000,
		Mode:      0b00,
	})
	machine.FPGA_PWR.Configure(machine.PinConfig{Mode: machine.PinOutput})
	machine.FPGA_EN.Configure(machine.PinConfig{Mode: machine.PinOutput})
	machine.IO1.Configure(machine.PinConfig{Mode: machine.PinOutput}) // SS

To start flashing, set FPGA_PWR and FPGA_EN to HIGH, IO1 to LOW, and write the bitstream.
Once flashing is successful, set IO1 to HIGH.

	err := machine.SPI0.Tx(data, nil) // data[] is the bitstream

	if err != nil {
		panic(err)
	}
	machine.IO1.High() // Setting SS to HIGH

A simple tool for flashing the FPGA can be found at https://github.com/YajTPG/shrike_go/blob/master/shrikeflash.go

Troubleshooting

Any troubleshooting tips go here.

Notes

You can use the USB port to the board as a serial port.

TinyGo has support for the RP2040’s on-board Programmable Input/Output (PIO) block.

For more informantion, see https://github.com/tinygo-org/pio