Introduction to Keil Software

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Introduction to Keil Software

• WWW.8051.IN

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Keil A Cross Compiler

• The Keil 8051 Development Tools are designed to
  solve the complex problems facing embedded
  software developers.
• Keil offers an evaluation package that will allow
  the assembly and debugging of files 2K or 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 source code
  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 cross compiler.

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Why do we need cross compiler?

• Development of complex embedded systems completed
  in 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
  available with 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 all the
  related files connected with your project.
• Editing window is the place where you will edit
  the code
• Output window will show the output when you
  compile 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 test with.
  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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• Compiler will ask for copying standard 8051
  startup code to project folder.
• Click NO

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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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• includeltreg51.hgt
• void delay( )
• int i
• for(i0ilt18000i)
• void main( )
• bit mybit
• mybit1
• while(1)
• P1mybit
• mybitmybit
• delay()

• Copy the Program source code to the Right into
  the new window.
• This file will toggle Port 1 with a delay.

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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 to the project

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Creating HEX for the Part

• Click on Target 1 in Tree menu
• Click on Project Menu and select Options for
  Target 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 it should 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 change as you completely step
  through the code.
• To exit out, Click on Debug Menu and Select
  Start/Stop Debug Session

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THANKS

• VISIT www.8051.in for more.