EmbLogic » Pooja Gaur

IEEE 1284-1994 std. device driver for 74LS244 Parallel port- BYTE MODE

Pooja Gaur — Fri, 21 Nov 2014 04:26:07 +0000

RCS file: header.h,v
Working file: header.h
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
File contains header file and macros used
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revision 1.2 locked by: root;
date: 2014/11/19 10:06:25; author: root; state: Exp; lines: +3 -3
ioport.h , io.h
add delay.h for msleep
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revision 1.1
date: 2014/11/19 10:03:05; author: root; state: Exp;
Initial revision
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RCS file: file_operation.h,v
Working file: file_operation.h
head: 1.1
branch:
locks: strict
root: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
File contains application operations mapping to driver operations
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revision 1.1 locked by: root;
date: 2014/11/19 10:03:05; author: root; state: Exp;
Initial revision
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RCS file: declaration.h,v
Working file: declaration.h
head: 1.1
branch:
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root: 1.1
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total revisions: 1; selected revisions: 1
description:
File contains function declaration and variable declaration
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revision 1.1 locked by: root;
date: 2014/11/19 10:03:05; author: root; state: Exp;
Initial revision
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if not free, release region
Request for region
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revision 1.1
date: 2014/11/19 10:03:05; author: root; state: Exp;
Initial revision
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RCS file: devopen.c,v
Working file: devopen.c
head: 1.1
branch:
locks: strict
root: 1.1
access list:
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keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
File contains implementation of container_of
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revision 1.1 locked by: root;
date: 2014/11/19 10:03:05; author: root; state: Exp;
Initial revision
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RCS file: devwrite.c,v
Working file: devwrite.c
head: 1.5
branch:
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root: 1.5
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total revisions: 5; selected revisions: 5
description:
File conatains implementation of copy_from_user
user sent data which is copied to SCULL
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revision 1.5 locked by: root;
date: 2014/11/19 10:23:13; author: root; state: Exp; lines: +1 -1
Sent strobe that data is valid
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revision 1.4
date: 2014/11/19 10:17:14; author: root; state: Exp; lines: +1 -1
check if reader is free, by receiving Acknowlegement
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revision 1.3
date: 2014/11/19 10:15:30; author: root; state: Exp; lines: +1 -1
sent character to data register
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revision 1.2
date: 2014/11/19 10:14:13; author: root; state: Exp; lines: +1 -1
Initialy set control register 0×00
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revision 1.1
date: 2014/11/19 10:03:05; author: root; state: Exp;
Initial revision
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RCS file: devread.c,v
Working file: devread.c
head: 1.8
branch:
locks: strict
root: 1.8
access list:
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keyword substitution: kv
total revisions: 8; selected revisions: 8
description:
File read the data from register and copy to user application
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revision 1.8 locked by: root;
date: 2014/11/19 11:04:15; author: root; state: Exp; lines: +1 -1
Copy to user application
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revision 1.7
date: 2014/11/19 11:02:37; author: root; state: Exp; lines: +1 -1
Receieve character from data register
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revision 1.6
date: 2014/11/19 11:00:46; author: root; state: Exp; lines: +2 -2
Reset strobe to 0
Set 5 bit high for bidirectional in control register
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revision 1.5
date: 2014/11/19 10:59:32; author: root; state: Exp; lines: +1 -1
Check for Acknowledgement that the coming data is valid
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revision 1.4
date: 2014/11/19 10:58:01; author: root; state: Exp; lines: +1 -1
After 5 sec sent strobe, receiver is free
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revision 1.3
date: 2014/11/19 10:56:37; author: root; state: Exp; lines: +1 -1
reader sleep for 5 seconds
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revision 1.2
date: 2014/11/19 10:55:26; author: root; state: Exp; lines: +1 -1
Sent strobe that the receiver is busy in control register
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revision 1.1
date: 2014/11/19 10:53:45; author: root; state: Exp;
Initial revision
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RCS file: removedriver.c,v
Working file: removedriver.c
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
File contains exit module
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revision 1.2 locked by: root;
date: 2014/11/19 10:25:09; author: root; state: Exp; lines: +1 -0
Release region when driver is removed
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revision 1.1
date: 2014/11/19 10:05:00; author: root; state: Exp;
Initial revision
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Command to know CPU Architecture & Endianness

Pooja Gaur — Sat, 15 Nov 2014 08:02:27 +0000

lscpu: lscpu gathers CPU architecture information like number of CPUs, threads, cores, sockets, NUMA nodes, information about CPU caches, CPU family, model, bogoMIPS, byte order and stepping from sysfs and /proc/cpuinfo, and prints it in a human-read?able format.
Cmd to know system endianness:
1. file a.out
2. lscpu | grep -i byte
3.readelf -h libname //command to check particular library info

IEEE std. 1284-1994 std. Signaling method for 74LS244 – NIBBLE MODE

Pooja Gaur — Thu, 13 Nov 2014 05:19:15 +0000

RCS file: header.h,v
Working file: header.h
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 1
description:
This is header file, which contains all the header file used in driver
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revision 1.2 locked by: root;
date: 2014/11/12 12:26:12; author: root; state: Exp; lines: +1 -0
Add linux/ioport.h
add asm/io.h
add linux/delay.h
=============================================================================

RCS file: declaration.h,v
Working file: declaration.h
head: 1.1
branch:
locks: strict
root: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
This file contains all the functions declaration
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revision 1.1 locked by: root;
date: 2014/11/12 12:08:53; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: file_operation.h,v
Working file: file_operation.h
head: 1.1
branch:
locks: strict
root: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
This file contains operation mapping.
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revision 1.1 locked by: root;
date: 2014/11/12 12:08:53; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: driver.c,v
Working file: driver.c
head: 1.2
branch:
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root: 1.2
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total revisions: 2; selected revisions: 1
description:
This file contains allocation of region in memory
Add device with major and minor
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revision 1.2 locked by: root;
date: 2014/11/12 12:11:23; author: root; state: Exp; lines: +1 -0
Check for parallel port region
if occupied, release region
then, request for region
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RCS file: devopen.c,v
Working file: devopen.c
head: 1.1
branch:
locks: strict
root: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
use container of
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revision 1.1 locked by: root;
date: 2014/11/12 12:08:53; author: root; state: Exp;
Initial revision
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RCS file: devwrite.c,v
Working file: devwrite.c
head: 1.3
branch:
locks: strict
root: 1.3
access list:
symbolic names:
keyword substitution: kv
total revisions: 3; selected revisions: 3
description:
This file allocates memory for quantum & qset in scull
data sent from write application is stored in quantum
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revision 1.3 locked by: root;
date: 2014/11/12 12:43:56; author: root; state: Exp; lines: +1 -1
For second nibble shift the character by 4
same steps are followed for second nibble
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revision 1.2
date: 2014/11/12 12:38:50; author: root; state: Exp; lines: +1 -1
set 0×00 at control register
& character from quantum with 0x0f, for first nibble
sent first nibble
checking status of reader, if free or not
if received strobe from reader, that the reader is free now
sent the strobe that data is valid
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revision 1.1
date: 2014/11/12 12:38:06; author: root; state: Exp;
Initial revision
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RCS file: devread.c,v
Working file: devread.c
head: 1.3
branch:
locks: strict
root: 1.3
access list:
symbolic names:
keyword substitution: kv
total revisions: 3; selected revisions: 3
description:
This file read the character from port, and copy to the user application
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revision 1.3 locked by: root;
date: 2014/11/12 13:12:17; author: root; state: Exp; lines: +1 -1
Shift the second nibble received by 3
Shift the received charcter by 4 to make it msb
|(or) with previous stored chracter in first nibble.
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revision 1.2
date: 2014/11/12 13:02:10; author: root; state: Exp; lines: +1 -1
First make the reader busy, then after 5 sec free the reader
sent the strobe signal that the reader is free
wait for acknowlegement the data going to be received is valid or not
when receives the strobe, from writer that the data is valid
set the control register 32 for bidirectional
receives the first nibble and & with 0×78
shift the receive nibble by 3, & with 0x0f
store the character in other variable
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revision 1.1
date: 2014/11/12 13:00:27; author: root; state: Exp;
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RCS file: devrelease.c,v
Working file: devrelease.c
head: 1.1
branch:
locks: strict
root: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
This file free the allocated memory for device
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revision 1.1 locked by: root;
date: 2014/11/12 12:08:53; author: root; state: Exp;
Initial revision
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RCS file: removedriver.c,v
Working file: removedriver.c
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
unregister allocated region
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revision 1.2 locked by: root;
date: 2014/11/12 12:12:56; author: root; state: Exp; lines: +1 -0
File contains release region when driver is removed
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revision 1.1
date: 2014/11/12 12:08:53; author: root; state: Exp;
Initial revision
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CREATING STATIC LIBRARY

Pooja Gaur — Mon, 10 Nov 2014 17:32:00 +0000

Static libraries are collection of ordinary object files. For a static library, the actual code is extracted from the library by the linker and used to build the final executable at the point you compile/build your application.
Steps:
1.Creates .c file, that contains functions in your library and application.
2.Create object file.eg
gcc -c add.c -o add.o
//-c means to create an intermediary object file, rather than an executable.
3.Create static library.This step is to bundle multiple object files in one static library.
ar rcs libststlib.a add.o sub.o
//r means to insert with replacement, c means to create a new archive,
and s means to write an index.
NOTE: A static library must start with ‘lib’ and have the suffix ‘.a’.
4.Making Executable and linking with library.
gcc -o operation operation.o -L. -lststlib
Note: -L. is used to tell that the static library is in current folder or you can provide the path too.
-l searches for the library named library at the time of linking. Linker searches and processes libraries and object files in the order they are specified.
5. Run the program.

Note:
1.You can see the list of object files in your library using
ar -t libststlib.a
2.ar is archive is single file holding a collection of other files.

IEEE 1284 device driver for 74LS244 parallel port- Compatibility mode

Pooja Gaur — Mon, 10 Nov 2014 04:54:41 +0000

Implementing read and write operations for Compatibility mode.In compatibility mode , the data is sent character by character on a hardware which consists of 8 led. It is tested by sending data on LEDs connected on a hardware.

RCS file: header.h,v
Working file: header.h
head: 1.1
branch:
locks: strict
root: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
add linux/ioport.h
add asm/io.h
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revision 1.1 locked by: root;
date: 2014/11/06 12:47:01; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: declaration.h,v
Working file: declaration.h
head: 1.1
branch:
locks: strict
root: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
This is DECLATAION file
all the function prototypes,declared in this file
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revision 1.1 locked by: root;
date: 2014/11/06 12:47:01; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: file_operation.h,v
Working file: file_operation.h
head: 1.1
branch:
locks: strict
root: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
this file contains the mapping of devwrite file to write called from application
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revision 1.1 locked by: root;
date: 2014/11/06 12:47:01; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: devopen.c,v
Working file: devopen.c
head: 1.1
branch:
locks: strict
root: 1.1
access list:
symbolic names:
keyword substitution: kv
total revisions: 1; selected revisions: 1
description:
—————————-
revision 1.1 locked by: root;
date: 2014/11/06 12:47:01; author: root; state: Exp;
Initial revision
=============================================================================

RCS file: driver.c,v
Working file: driver.c
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
this file contains the initialization of module
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revision 1.2 locked by: root;
date: 2014/11/06 12:50:22; author: root; state: Exp; lines: +1 -0
check if region is free i.e. at address 0×378
if not free, request for region
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revision 1.1
date: 2014/11/06 12:47:01; author: root; state: Exp;
Initial revision
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RCS file: devwrite.c,v
Working file: devwrite.c
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
allocate region for scull in memory, and store data write from application in quantum of scull
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revision 1.2 locked by: root;
date: 2014/11/06 12:55:39; author: root; state: Exp; lines: +2 -2
Initially reset data lines by outb(0×00)
character sent in loop at interval of 5 sec
character are write in quantum from application, and in each loop one character is outb
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revision 1.1
date: 2014/11/06 12:47:01; author: root; state: Exp;
Initial revision
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RCS file: removedriver.c,v
Working file: removedriver.c
head: 1.2
branch:
locks: strict
root: 1.2
access list:
symbolic names:
keyword substitution: kv
total revisions: 2; selected revisions: 2
description:
this file contains exit module when driver is removed
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revision 1.2 locked by: root;
date: 2014/11/06 12:52:36; author: root; state: Exp; lines: +1 -0
region is released when driver is removed
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revision 1.1
date: 2014/11/06 12:47:01; author: root; state: Exp;
Initial revision
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Difference between Hardlink & Softlink/Symbolic link

Pooja Gaur — Mon, 03 Nov 2014 07:27:20 +0000

Hard link is a directory reference or pointer to a file. Hardlink is a label stored in a directory structure that refers the operating system to the file data when it is accessed.
Symbolic links are automatically resolved by the file system. Any software programs, upon accessing a symbolic link, will see the target instead, whether the program is aware of symbolic links or not. symlinks are like shortcuts.
Difference:
Hardlink creates the file with same inode number,size, & file permission of original file whereas Softlink creates the file with diferent inode number, size, & file permissions
when original file deleted, hardlink file still remain same but softlink file contents will lost.

Program of concatenate 2 string without strcat

Pooja Gaur — Mon, 12 May 2014 08:17:39 +0000

RCS file: fun_3.c,v
Working file: fun_3.c
head:
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 0
description:
Program to concatenate two strings without strcat
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