# Example

This directory shows how to flash a system verilog program (A full-adder) on a Zybo `xc7z010clg400-1` card.

## Build

Firstly, the system verilog file needs to be converted to verilog in order to use it with yosys :

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

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

Then, yosys can achieve the RTL synthesis of the program :

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

Nextpnr can now place and route each components using the xdc constraints file :

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

Now the fasm file can be converted in a frames file and then in a bitstream :

```bash
podman run --mount=type=bind,source=.,target=/root/code fmn_alpine fasm2frames --part xc7z010clg400-1 --db-root /usr/share/xray/database/zynq7 out.fasm out.frames
podman run --mount=type=bind,source=.,target=/root/code fmn_alpine 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 card 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 fmn_alpine openFPGALoader -b zybo_z7_10 out.bin
```
