ESD Lab 01

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Embedded Software Design (EC242)

B.Sc. Special Honours Degree

in

Information Technology

(Computer Systems & Networking)

2nd

Year – 2nd

Semester

Lab 01

Objectives

After completing this lab you will be able to;

1. Write simple assembly language programs to run on PIC16F microcontrollers.

2. Describe the procedure of creating a project in MPLAB IDE to program PIC16F

microcontrollers.

3. Simulate a simple assembly language program using MPLAB IDE and PIC

SIMULATOR IDE.

4. Explain the usage of header files in MPLAB projects.

Important

You are advised to keep a proper lab notebook to takedown;

Code segments you develop during the lab sessions

Important facts related to the software and hardware tools used or the lab exercises

Calculations performed

And any other useful facts.

This notebook will be helpful for you to perform well in the lab assignments to be done in the

last 5/6 weeks of the semester. Also this notebook will help you to prepare well for the

examinations.

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Exercise

Create a new folder in D:\ pic or Z:\pic and name it as lab1_exe1

Open note pad and type the following code and save it as main.asm in the created

folder.

;Declaration and configuration of the processor

LIST P=16F877A

#include p16F877A.inc ;include the header file

num1 equ h'26'

num2 equ h'27'

num3 equ h'28'

org 0x00 ;the reset vector

goto main

main

;putting the value 0xF0 to num1

movlw 0xF0

movwf num1

;Using AND operation of num1 to mask bits

movlw 0x5F

andwf num1,f

;using OR operation on num2 to set bits

movf num1,w

iorwf num2,f

;using X-OR operation on working register to toggle

bits

movlw 0x01

clrf num3

xorwf num3,f

xorwf num3,f

endmain

goto endmain

end

Start -> All programs -> microchip -> MPLAB IDE 7.30 -> MPLABIDE

Once MPLAB is open go to project-> project wizard

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Click next and select the device as 16F877A

Select the Microchip MPASM tool suite.

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Enter the project name as lab1_exe1 and select the directory where the main.asm file

is saved.

Add the main.asm file and select it.

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Click finish.

Add the header file C:\program files\MICROCHIP\MPAS suit\P16F877A.inc

Build the project by clicking

Change the movlw in line 17 to mov and check the output once built.

You can go to the error line by clicking on the error message.

Select the MPLAB SIM in the debugger.

The following bar appears. The first button is to run the code the next is to pause the

execution. The 3rd

button will go through each instruction. The 4th

button will allow the user

to go through each instruction and go inside subroutines. The 5th

button will allow the user to

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go through each instruction and execute subroutines with one click. The 6th

button will allow

the user to come out from a subroutine. The last button will reset the MCU.

Use the breakpoint function and set a breakpoint and see what happens.

Open the stopwatch in the debugger menu and measure the time.

Open the watch window in the view tab and add the 3 variables num1,num2 and

num3 and the working register.

Find out the values of num1, num2, num3 and working register after each instruction.

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Num1 Num2 Num3 WREG

movlw 0xF0

movwf num1

movlw 0x5F

andwf

num1,f

movf

num1,w

iorwf

num2,f

movlw 0x01

clrf num3

xorwf

num3,f

xorwf

num3,f

Describe the operation of the below instructions.

movlw

movwf

andwf

movf

iorwf

movlw

clrf

xorwf

In order to check how the program responds to external outputs use the stimulus

controller in the debugger menu.

Update your lab notebooks.

ESD Lab 01

Documents

Transcript of ESD Lab 01