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INTRODUCTION TO
Keil SOFTWARE
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Keil: A Cross Compiler
The Keil 8051 Development Tools aredesigned to solve the complex problemsfacing embedded software developers.
Keil offers an evaluation package that willallow the assembly and debugging of files 2Kor less.
This package is freely available at their web
site. Keils website address is www.keil.com.
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Concept of compiler
Compilers are programs used to convert a High
Level Language to object code.
So if one wants to define a compiler then
compiler is a program that translates sourcecode into object code.
A cross compiler is similar to the compilers but
we write a program for the target processor (like
8051 and its derivatives) on the host processors
(like computer of x86)
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It means being in one environment you are
writing a code for another environment is
called cross development. And the compiler
used for cross development is called crosscompiler.
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Why do we need cross compiler?
Development of complex embedded systems completedin a fraction of the time
Reliability is improved Maintenance is easy Knowledge of the processor instruction set and memory
architecture is not required Improved program readability Keywords and operational functions that more nearly
resemble the human thought process can be used. Program development and debugging times are
dramatically reduced Existing routine can be reused in new programs by
utilizing the modular programming techniques availablewith C.
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Development tools provided by Keil
IDE (Integrated Development environment)
Project Manager
Simulator
Debugger
C Cross Compiler , Cross Assembler,
Locator/Linker
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An assembler is used to assemble your 8051
assembly program
A compiler is used to compile your C source
code into an object file
A linker is used to create an absolute object
module suitable for your in-circuit emulator.
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8051 project development cycle
These are the steps to develop 8051 project
using keil
Create source files in C or assembly.
Compile or assemble source files.
Correct errors in source files.
Link object files from compiler and assembler.
Test linked application
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Basic Keil Tutorial
Open Keil from the Start menu
The Figure below shows the basic names of the
windows referred.
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You can see three different windows in this
screen. 1) project work space window 2)editing window 3) output window.
Project workspace window is for showing allthe related files connected with your project.
Editing window is the place where you will editthe code
Output window will show the output when youcompile or build or run your project.
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To start with a new project
Select New Project from the Project Menu.
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Name the project.
Click on the Save Button.
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The device window
will be displayed.
Select the part you
will be using to testwith. For now we will
use the Atmel micro
controller AT89C51.
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Select this device
from given options.
Click OK
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Creating Source File
Click File Menu and
select New.
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A new window will open up in the Keil IDE
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Copy the Program source codeto the Right into the new
window. This file will toggle Port 1 with
a delay.
#include
void delay( )
{
int i;
for(i=0;i
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Click on File menu
and select Save As
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Name the file
Click the Save Button
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Adding File to the Project
Expand Target 1 in the Tree Menu and add file to
source group.
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Change file extension to .c
Click Add button
Click Close Button
Click OK button when you return to
Target, Groups, Filesdialog box
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Expand the Source
Group 1 in the Tree
menu to ensure that
the file was added tothe project
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Creating HEX for the Part
Click on Target 1 in
Tree menu
Click on Project Menu
and select Options forTarget 1
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Select Target Tab
Change Xtal (Mhz)into 11.0592
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Select Output Tab
Click on Create Hex
File check box
Click OK Button
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Click on Project Menu
and select
Rebuild all Target
Files
In the Build Window itshould report 0 Errors
(s), 0 Warnings
You are now ready to
Program your Part
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Click on Debug Menu and Select Start/Stop
Debug Session
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Running the Keil Debugger
The Keil Debugger
should be now be
Running.
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To check output..
Click on Peripherals.
Select I/O Ports,
Select Port 1
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A new window should
port will pop up. This
represent the Port
and Pins
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Step through the code by
pressing F11 (step by
step debugging) on the
Keyboard. The Parallel
Port 1 Box should changeas you completely step
through the code.
To exit out, Click on
Debug Menu and SelectStart/Stop Debug Session
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VISIT www.8051.in for more.
THANKS
www 8051 in
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