Wednesday, 23 December 2015

Download Verilog codes for SPI Master and Slave modules

By Unknown at Wednesday, December 23, 2015 1 comment

Sharing below the links for SPI Verilog codes for Master and Slave modules.

SPI means Serial Pheripheral Interface, is a synchronous serial data link operating in full duplex mode.

For detailed information of the Verilog code of SPI Master and Slaves modules, proceed to the below links.

For Verilog code of SPI Master and Slaves modules code download & discussions, click here.

PERL TUTORIAL PART 4 - Working with files

By Unknown at Monday, November 02, 2015 Perl, PERL FILE HANDLING, PERL TUTORIAL PART 4 1 comment

FILE HANDLING

The basics of handling files are simple, just associate a filehandle with an external file and then use a variety of operators and functions within Perl to read and update the data stored within the data stream associated with the filehandle. The filehandle is the name for an I/O connection between the Perl process and the outside world.

A filehandle is a named internal Perl structure that associates a physical file with a name. The mode of operation must be specified for the filehandle is opened.

Three basic file handles are - STDIN, STDOUT, and STDERR which represent standard input, standard output and standard error devices respectively. Apart from these, any number of filehandles can be added in the code.

The different file operations are:

1) Opening a file

2) Closing the file

3) File Reading

4) File Writing

5) File tests

1) Opening a file

The syntax for opening a file is as follows:

open(FILEHANDLE,"<mode>file_name");

or simply

open(FILEHANDLE,"mode","file_name");

where mode specifies the type of file access.

MODE SYMBOL	ACCESS TYPE
< or r	Read Only Access
> or w	Creates, Writes, and Truncates
>> or a	Writes, Appends, and Creates
+< or r+	Reads and Writes
+> or w+	Reads, Writes, Creates, and Truncates
+>> or a+	Reads, Writes, Appends, and Creates

Most commonly used are <, >, >>.

It is a good practice to use capital letters for filehandles. And for safe operation, it is always recommended to use the DIE(....) function for file open which will terminate the program when it fails to open the file.

open(FILEHANDLE,"mode","file_name") or die "Unable to open the file(file_name)";

Example:

open(FH1R,"<","file1.txt") or die "Unable to open the file(file1.txt) in read mode!";

open(FH2W,">file2.txt") || die "Unable to open the file(file2.txt) to write!";

$logfilename="log.txt"

open(LOG,">>",$logfilename) || die "Unable to open the file(log.txt) in append mode!!!";

2) Closing the file

To close a file simply call the CLOSE(...) function with the filehandle as input. All the filehanldes are automatically closed when the Perl program terminates. The syntax is

close(FILEHANDLE);

3) Reading from a file

To read the contents from the file, <> operator is used, just like STDIN.

Example:

$line_1=<FH1R>; #reads only one line

@lines=<FH1R>; #reads the entire file, & places in the array

4) Writing to a file

Writing data to a file is simply like printing to STDOUT, except the filehandle is used between the print keyword & data.

Example:

print FH2W "Hello!! This is 1st line...\n";

5) File testing

File tests are performed on file handles to determine the file properties. For example –e FileHandle returns true if the file pointed by FileHandle exists in the system. The below table shows the different file test that can be performed in Perl. Note that the CAPITAL and small letter tests produces different results.

PARAMETER	DESCRIPTION
-r	File or directory is readable
-w	File or directory is writable
-x	File or directory is executable
-o	File or directory is owned by user
-R	File or directory is readable by real user, not effective user (differs from -r for setuid programs)
-W	File or directory is writable by real user, not effective user (differs from -w for setuid programs)
-X	File or directory is executable by real user, not effective user (differs from -x for setuid programs)
-O	File or directory is owned by real user, not effective user (differs from -o for setuid programs)
-e	File or directory exists
-z	File exists and has zero size (directories are never empty)
-s	File or directory exists and has nonzero size (the value is the size in bytes)
-f	Entry is a plain file
-d	Entry is a directory
-S	Entry is a socket
-p	Entry is a named pipe (a "fifo")
-t	isatty() on the filehandle is true
-T	File is "text"
-B	File is "binary"
-c	Entry is a character-special file
-M	Modification age in days
-A	Access age in days
-C	Inode -modification age in days

Example:

if (-e FH1)

print "File FH1 exists\n";

if (-T FH1)

print "File FH1 exists & is a Text file\n";

$size= -s FH1;

print "File size is $size bytes...\n";

Click here to download the example code for file handling...

Click the below links to read other tutorials:

Perl - Basics
Perl - Operators & STD input output
Perl - Control structures & loops

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It helps us to do better in future.

Thank you.

Sort numbers using C# with and without .net feature.

By Unknown at Saturday, October 17, 2015 C# No comments

The following Program is a Example of getting 10 integer numbers (from -1000 to 1000) from User and Store it in an array and sort them and Display. .

WITH .NET Feature :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication5
{
class Program
{
static void Main(string[] args)
{
String num_str;
int[] num = new int[10];
int temp;
bool num_flag = false;

Console.WriteLine("Enter 10 integer number:");
for(int i = 0 ; i < 10 ; i++)
{
Console.WriteLine("enter {0} number",i);
num_str = Console.ReadLine();
num_flag = int.TryParse(num_str, out temp);

while (num_flag == false)
{
Console.WriteLine("please Enter interger");
num_str = Console.ReadLine();
num_flag = int.TryParse(num_str, out temp);
}
if ((temp >= -1000) && (temp <= 1000))
{
num[i] = temp;
}
else
{
Console.WriteLine("Please Enter number (-1000 <= x <= 1000");
i--;
}
}

Array.Sort(num);
foreach (int value in num)
{
Console.Write(value);
Console.Write(' ');
}
Console.ReadLine();
}
}
}

WITHOUT .NET Feature :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication6
{
class Program
{

static void Main(string[] args)
{
String num_str;
int[] num = new int[10];
int temp;
bool num_flag = false;

Console.WriteLine("Enter 10 integer number:");
for(int i = 0 ; i < 10 ; i++)
{
Console.WriteLine("enter {0} number",i);
num_str = Console.ReadLine();
num_flag = int.TryParse(num_str, out temp);

while (num_flag == false)
{
Console.WriteLine("please Enter interger");
num_str = Console.ReadLine();
num_flag = int.TryParse(num_str, out temp);
}
if ((temp >= -1000) && (temp <= 1000))
{
num[i] = temp;
}
else
{
Console.WriteLine("Please Enter number (-1000 <= x <= 1000");
i--;
}
}

//Array.Sort(num);

for (int x = 0; x < num.Length; x++)
{
for (int y = 0; y < num.Length - 1; y++)
{
if (num[y] > num[y + 1])
{
int temp1 = num[y + 1];
num[y + 1] = num[y];
num[y] = temp1;
}
}
}
foreach (int value in num)
{
Console.Write(value);
Console.Write(' ');
}
Console.ReadLine();

}
}
}

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APPLICATION WAIT TIMER USING VBSCRIPT

By Unknown at Saturday, August 29, 2015 APPLICATION WAIT TIMER USING VBSCRIPT, VBSCRIPT No comments

tim = InputBox("Please enter wait time [min:sec]")

a=Split(tim,":")

sec=a(1)*1000

min=a(0)*60*1000

Wscript.sleep (min + sec)

msgbox "Hey! " & a(0) & " min " & a(1) & " secs elapsed!!!"

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