Why Verilog $fread Only Read til 1658 Byte?

[jasonkee111]

I face an issue of $fread only read up to 1658 Byte. The snippet of code is below:

    byte   TempDataBY[2000];

    FileID      = $fopen(BinFile.rbf, "r");
    if (FileID == NULL)
        $error ("Error Open File: %s", FileName);

    while (!$feof(FileID)) begin
        ReadStatus  = $fread(TempDataBY,FileID);
    end

    $display("FileID:%d, End of File", FileID);

Pls advice. Thanks.

 

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I had to add a bunch of stuff and correct the typos of missing "" around the filename, but it worked for me. All the data from the file BinFile.rbf ends up in TempDataBY.

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Code Verilog - [expand]
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module test;
  
  localparam NULL = 0;
  integer FileID, ReadStatus;
  reg [8*20-1:0] FileName; //forced to use this instead of string (Vivado simulator does not support SV string)
 
  initial begin : file_io
    byte   TempDataBY[3000];
 
    FileID = $fopen("BinFile.rbf", "r");
    if (FileID == NULL) $error ("Error Open File: %s", FileName);
 
    while (!$feof(FileID)) begin
        ReadStatus  = $fread(TempDataBY,FileID);
    end
 
    // added to check the data loaded into TempDataBY by the $fread.
    for (int i=0;i<3000;i++) begin
      $display ("TempDataBY[%d] = %h", i, TempDataBY[i]);
    end
 
    $display("FileID:%d, End of File", FileID);
    $fclose(FileID);
  end
 
endmodule

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I did end up getting a single warning from the simulator:
WARNING: Insufficient data from the input file for $fread
which doesn't make sense as I increased the size of the file to 4000 bytes. I started with 2000 bytes exactly then changed it to 2002 (used a text file of 0-9 repeated (ends with CR-LF )).

Not sure why you're not reading the entire binary file in. Are you sure the file isn't 1658 bytes in length?

 

[jasonkee111]

Hi

i am sure that my binary file is more than 2kB. It is fine when i am using fscanf using the same method but the data stored in normat .txt. Anyway, i am using mentor questa and i have file an service request to them.