// *************************************************
// * Private Constructors *
// *************************************************
// *************************************************
// * Private Methods *
// *************************************************
// *************************************************
// * Public properties and Indexer *
// *************************************************
// *************************************************
// * Public constructors *
// *************************************************
public ReedSolomonECC(Int32 msgSymbolCnt, Int32 maxCorrectibleErrorCnt, Byte symbolBitWidth)
{
k = msgSymbolCnt;
s = maxCorrectibleErrorCnt;
N = k + 2 * s;
// Create Binary Galois Field ( that is GF(2^symbolBitWidth) )
galoisField = new BinaryGaloisField(symbolBitWidth);
// Create the generator polynomial, g(x)
generatorPoly = ReedSolomonECC.createGeneratorPolynomial(galoisField, maxCorrectibleErrorCnt);
}
/// <summary>
/// Main program.
/// </summary>
/// <param name="args">Input commandline arguments</param>
/// <returns>Return code: 0 for correct exit, -1 for unexpected exit</returns>
static Int32 Main(String[] args)
{
// Assumes that in AssemblyInfo.cs, the version is specified as 1.0.* or the like,
// with only 2 numbers specified; the next two are generated from the date.
System.Version v = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
// v.Build is days since Jan. 1, 2000, v.Revision*2 is seconds since local midnight
Int32 buildYear = new DateTime( v.Build * TimeSpan.TicksPerDay + v.Revision * TimeSpan.TicksPerSecond * 2 ).AddYears(1999).Year;
// Begin main code
//Console.Clear();
Console.WriteLine("-----------------------------------------------------");
Console.WriteLine(" TI EMIF2.5 ECC Parity Generator for " + devString );
Console.WriteLine(" (C) "+buildYear+", Texas Instruments, Inc." );
Console.WriteLine(" Ver. "+v.Major+"."+v.Minor.ToString("D2") );
Console.WriteLine("-----------------------------------------------------");
Console.Write("\n\n");
// Parse the input command line parameters
ProgramCmdParams cmdParams = ParseCmdLine(args);
if (!cmdParams.valid)
{
DispHelp();
return -1;
}
// Create Reed Solomon ECC Object
// Usage: ReedSolomonECC(Int32 msgSymbolCnt, Int32 maxCorrectibleErrorCnt, Byte symbolBitWidth)
ReedSolomonECC rs = new ReedSolomonECC(512,4,10);
// Create binary writer for saving ECC data to output file
BinaryWriter bw = new BinaryWriter(new FileStream(cmdParams.outputFileName,FileMode.Create,FileAccess.Write));
// Read input data from file
Byte[] fileData = FileIO.GetFileData(cmdParams.inputfileName);
Int32[] subArray = new Int32[512];
Int32[] parityArray;
for (int i=0; i<fileData.Length; i+=512)
{
for (int j=0; j<512; j++)
{
// Swap order of message data since this is apparently what the hardware does
// for its RS calculations
subArray[511-j] = ((i+j) >= fileData.Length) ? (0xFF) : ((Int32) fileData[i+j]);
}
// Calculate parity of the message data
parityArray = rs.GenerateParity(subArray);
// Prep the parity data and output it to file
if (cmdParams.verbose)
{
Console.WriteLine("NAND operation #{0}",(i/512)+1);
}
for (int j=0; j<8; j+=2)
{
if (cmdParams.verbose)
{
Console.WriteLine("\tNAND4BITECC{0} = {1:X8}", (j/2 + 1),( (parityArray[j+1] & 0x3FF) << 16) | (parityArray[j] & 0x3FF) );
}
bw.Write( ( (parityArray[j+1] & 0x3FF) << 16) | (parityArray[j] & 0x3FF) );
}
}
return 0;
}
