GROUP EVALUATION FORM
Laboratory 5: Parallel Port Interfacing
Group No:
Section:
LAB SCHEDULE:
Group Members:
DATE PERFORMED:
1.
DATE SUBMITTED:
2.
Exercises
3.
Prog’g Problems
4.
Teamwork (+pts)
5
EVALUATION GRADE:
EVALUATION: (for lab instructor use only)
Exercises (50%):
Prog’g Problems (50%):
Lab Performance (10%):
Attendance (10%):
LABORATORY NO. 5
Parallel Port Interfacing
I. Objective
 To introduce parallel port of PC its internal registers and pin configurations.
 To understand the operations of basic I/O devices.
 To develop interface programs that will manipulate the I/O devices using parallel port.
II. Components to be borrowed
 PC power cords (2)
 Keyboard
 Mouse
 Printer Cable
 Power supply
 Breadboard
 Connecting wires (13)
 I/O-01 module
 I/O-02 module
III. Conceptual Framework
The professor will provide this.
IV. Procedure:

Using LEDs
1.
Connect I/O-01 module to DB25 connector.
DB 25
25
GND
1
9
10
8
11
7
6
5
4
12
13
14
15
3
2
16
17
+5v
LEDS
CIRCUTRY
I/O-01 MODULE
26
Note: Don’t forget to connect any of the pins 18 to 25 of DB25 and pin 1 of I/O-01 module to GND, and pin 26 to
+5v.
j.tio
Lab5
2
PIN CONFIGURATION OF DB25:
Pin No
2-9
10,11,12,13,15
1,14,16,17
18-25
1.
2.
3.
4.
Description
D0-D7
S6,S7,S5,S4,S3
C0,C1,C2,C3
GND
Assemble the given program LAB5E1.asm (refer to attached file) using
NASMIDE software.
Compile and execute the program.
Observe the output of the LEDs for each of the following inputs. Shade the circle that corresponds to
LED being lit.
Key pressed (Input)
1
0
8 LEDs output
5. Repeat steps number 2 and 3 considering the given program LAB5E2.asm. Observe the output of
LEDs and illustrate the output.
Screen Output

8 LEDs output
Using 7-segment Display
6. Connect I/O-02 module to DB25 connector.
DB 25
25
GND
1
9
17
8
16
7
6
5
4
15
14
13
12
3
2
11
10
+5v
7-SEGMENT DISPLAY
CIRCUTRY
I/O-02 MODULE
26
Note: Don’t forget to connect any of the pins 18 to 25 of DB25 and pin 1 of I/O-02 module to
GND and +5v to pin 26 of I/O-02 module.
j.tio
Lab5
3
7. Assemble the program LAB5E3.asm.
8. Compile and execute the program.
9. Observe the output. Write your observation on the provided table.
Key pressed
7-segment
Screen Output
1
0
Any key
V. Programming Problems:
1. Develop a program that will display the equivalent binary code (using the LED board) of the key
being pressed.
Key pressed (Input)
0
1
2
3
4
:
:
:
E
F
8 LEDs output
:
:
:
2. Design a PC-based application that will automatically display the numbers from 00 to 99 into the 7segment display.
3. Design a PC-based application that will simulate a parking system having 10 parking slots. The
system should indicate if the parking is full, which will be indicated by the 7-segment display as
FULL (displaying 2 letters at a time). It should also provide the number of parking spaces occupied.
Screen Output
Customer wants to park/exit (P/E)?
Customer wants to park/exit (P/E)? P
Customer wants to park/exit (P/E)? P
Customer wants to park/exit (P/E)? E
*Customer wants to park/exit (P/E)? P
7 segment Output
00
01
02
01
FULL
* Assume 10 slots occupied
j.tio
Lab5
4
4. Write a program that will display the following 8-LED patterns based on the switch pressed. Please
refer to the conditions and connections below.
Conditions:
Switch Pressed
1
2
3
8-LED Pattern
Alternate lights
Running lights
Blinking lights
DB 25
25
GND
1
15
2
13
3
12
4
+5v
26
GND
1
SWITCHES
CIRCUTRY
I/O-01 MODULE
DB 25
25
9
10
8
11
7
6
5
4
12
13
14
15
3
2
16
17
+5v
j.tio
LEDS
CIRCUTRY
I/O-01 MODULE
26
Lab5
5
;NASM-IDE ASM Assistant Assembler Project File
BITS 16
;Set code generation to 16 bit mode
ORG 0x0100
;Set code start address to 0000h
; Filename: LAB5E1.asm
; LED Control
; Author: J. TIO
[section .text]
MAIN:
jmp START
DISP:
mov ah,09h
int 21h
ret
OFF:
mov
mov
out
jmp
ON:
mov
mov
out
;String Print int service
al,00h
dx, 378h
dx, al
MAIN
;All LEDs OFF
al,0FFh
dx, 378h
dx, al
;All LEDs ON
START:
lea dx,[msg1]
call DISP
mov ah, 01h
int 21h
cmp al,'1'
je ON
cmp al,'0'
je OFF
END:
mov al, 00h
mov dx, 378h
out dx, al
mov ah, 4Ch
int 21h
;Display message
;keyboard interrupt
;press 1 to ON
;press 0 to OFF
;OFF LEDs and motor
;End of program
section .data
msg1 db 13,10,'Press 1/0(press any key to exit):
j.tio
Lab5
','$'
6
; Information
; Program Title : Introduction to NASM
;
External name : LAB5E2.COM
;
;
;
Version
Author
Description
bits 16
org 0x0100
: 1.1
: J. Tio
: A simple example of
;parallel interfacing file programmed
;using NASM-IDE 1.5 and NASM 0.98.08.
; Set 16 bit code generation
; Set code start address to
; 100h (COM file)
[section .text]
MAIN:
jmp
START
DISPLAY:
lea dx,[msg1]
mov ah,09h
int $21
ret
; Jump to label 'START'
;
;
;
;
DELAY:
.NEXT:
.NEXT2:
END:
mov
int
ret
MOV CX, 01Fh
MOV BX,0FFFFH
NOP
NOP
NOP
DEC BX
JNZ .NEXT2
LOOP .NEXT
RET
ah, $4C
$21
PATTERN:
;1st pattern
mov dx,$378
mov al,$03
out dx,al
call DELAY
j.tio
Subroutine program
string print
service no 09h
interrupt 21h
;Delay program
;outer loop
;inner loop
;Define label 'END'
;service no =4ch
;return to calling
;set data port address
;set two LEDs ON
;output to data port
;call delay subroutine
Lab5
7
;2nd pattern
mov dx,$378
mov al,$02
out dx,al
call DELAY
;3rd pattern
mov dx,$378
mov al,$01
out dx,al
call DELAY
;4th pattern
mov dx,$378
mov al,$00
out dx,al
call DELAY
ret
START:
call DISPLAY
call PATTERN
call END
section .data
msg1
;set data port address
;set one LED = OFF, another LED=ON
;output to data port
;call delay subroutine
;set data port address
;set one LED = ON, another LED=OFF
;output to data port
;call delay subroutine
;set data port address
;set two LEDs = OFF
;output to data port
;call delay subroutine
; display message on screen
; display pattern
; end program
db
13,10,Program running? ','$'
----------------------------------------------
;NASM-IDE ASM Assistant Assembler Project File
BITS 16
;Set code generation to 16 bit mode
ORG 0x0100
;Set code start address to 0000h
; Filename: LAB5E3.asm
; 7-Segment Display Control
; Author: J. TIO
[section .text]
MAIN:
jmp START
DISP:
mov ah,09h
int 21h
ret
j.tio
;String Print int service
Lab5
8
ON2:
lea dx,[msg3]
call DISP
mov al,0F0h
mov dx, 378h
out dx, al
jmp MAIN
;Display message
lea dx,[msg2]
call DISP
mov al,0Fh
mov dx, 378h
out dx, al
;Display message
;2nd 7-seg ON
ON1:
START:
lea dx,[msg1]
call DISP
;1st 7-seg ON
;Display message
mov ah, 01h
int 21h
;keyboard interrupt
cmp al,'1'
je ON1
cmp al,'2'
je ON2
;press 1 to ON1
mov
mov
out
mov
int
;LEDs OFF
;press 2 to ON2
END:
section
msg1 db
msg2 db
msg3 db
j.tio
al,
dx,
dx,
ah,
21h
00h
378h
al
4Ch
;End of program
.data
13,10,'Press 1/0: ','$'
13,10,'First 7-SEG ON...','$'
13,10,'Second 7-SEG ON...','$'
Lab5
9