# Example

This directory shows how to flash a SystemVerilog program (a full-adder) on a Zybo `xc7z010clg400-1` board.

## Build

Firstly, the SystemVerilog file needs to be converted to verilog to use it with Yosys :

```bash
podman run --mount=type=bind,source=.,target=/root/code localhost/fmn-toolchain sv2v adder.sv -w adder.v
```

The mount parameter is used to provide the current directory to podman.

Then, Yosys can perform the RTL synthesis of the program :

```bash
podman run --mount=type=bind,source=.,target=/root/code localhost/fmn-toolchain yosys adder.v -p "synth_xilinx; write_json synthesis.json"
```

Nextpnr can now place and route each component using the XDC constraints file :

```bash
podman run --mount=type=bind,source=.,target=/root/code localhost/fmn-toolchain nextpnr-himbaechel --json synthesis.json -o xdc=adder.xdc -o fasm=out.fasm --device xc7z010clg400-1
```

Now the FASM file can be converted to a frames file and then to a bitstream :

```bash
podman run --mount=type=bind,source=.,target=/root/code localhost/fmn-toolchain fasm2frames --part xc7z010clg400-1 --db-root /usr/share/xray/database/zynq7 out.fasm out.frames
podman run --mount=type=bind,source=.,target=/root/code localhost/fmn-toolchain xc7frames2bit -frm_file out.frames -part_file /usr/share/xray/database/zynq7/xc7z010clg400-1/part.yaml --output_file out.bin
```

## Flashing the FPGA

Finally, we can flash the bitstream on the board with `openFPGALoader`.

Podman requires a device argument to allow `openFPGALoader` to access the USB interface. You can find this path with `lsusb` :

```txt
Bus 003 Device 005: ID 0403:6010 Future Technology Devices International, Ltd FT2232C/D/H Dual UART/FIFO IC
```

Here the usb device path is `/dev/bus/usb/003/005`

```bash
podman run --device=/dev/bus/usb/003/005 --mount=type=bind,source=.,target=/root/code localhost/fmn-toolchain openFPGALoader -b zybo_z7_10 out.bin
```
