How to write data in a file from FPGA

Store it in a file where? On what device/media? On your Windows PC filesystem? Or on an SDcard attached to your FPGA?

Probably the simplest solution is to dump the data out using a UART serial module and connect the serial pins thru the
appropriate level conversion logic to a USB serial converter plugged into your PC. Then you can capture the result on a terminal window.

Thank you for the reply.

Storing data in anyway is useful for me. Any way that is easier works for me.

Can you please explain a bit more about the solution you mentioned? What hardware and software I will need to do that?

DE2-115 is a very nice development board, I also happen to have one of those.

It has a standard 9p RS232 compatible serial port, so you could just connect that to a PC via a COM port or a SERIAL/USB adapter.

So you could just implement a UART module in the FPGA and write text/data to the serial port and capture it on a PC.

It also has an SDcard socket, but that will require much more effort to use in any effective way.

Same for the etherNet port connections on the board.

Thank you for the quick and helpful suggestions from the community!

Hi @MG007,

Do you need further help in regards to this case?

Best Regards,

Richard Tan

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Richard Tan

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module BinarySearch (
input logic clk,
input logic [6:0] target,
input logic valid,
output logic [6:0] D_out
);

reg [6:0] result;
integer file_out;

initial file_out = $fopen("output.txt", "w");

always_ff @(posedge clk) begin
if (valid) begin
result <= D_out;
$fwrite(file_out, "%b\n", result);
end
end

endmodule

This shortened version retains the essential components for storing D_out when valid is high and writes the result to a file during simulation. Adjust the file path and name as needed.

Regards
Menupro

The above code snippet will ONLY work within a logic simulation environment.

System tasks like $fopen() $fwrite() $fread() $fclose() etc are not supported in synthesis and on real hardware.

Which was the question the original poster had: saving data from an FPGA design on a physical development board.

If it were me I would use SignalTap with appropriately selected conditional storage qualifiers, then export the data / create signaltap list file.