8051 practice programs

7/28/2019 8051 Practice Programs

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LEDs

/

**************************************************************************

************Program 1:Write a program to scroll the 2 LEDs left side?

**************************************************************************************/

Algorithm:

1.First,we define P2 to LED.2.We should do left shift operation.

3.Two LEDs are blinking.

Program:#include

#define LED P2

ui i;

void main(){

while(1)

{P2=0x03;

for(i=0;i


2/25

/***********************************************************************

Program 2:Write a program to scroll the 2 LEDs right side?

***********************************************************************/

Algorithm: 1.First,we define P2 to LED.

2.Initialize the value to P2.

3.We should do right shift operation.4.Two LEDs are blinking.

Program:#include

#define LED P2

ui i;void main()

{while(1)

{

P2=0x03;for(i=0;i>2;

}

}

/***********************************************************************

OUTPUT:We observed that,scrolled the LEDs right side.

**********************************************************************/

2


3/25

/***********************************************************************

Program 3:Write a program to blink Green to Red alternate way?

***********************************************************************/

Algorithm:

1.First,we define P2 to LED.

2.Initialize the values to P2.

3.LEDs are blinking alternately.

Program:

#include

#define LED P2

void Delay();void main()

{

ui i=5;while(1)

{

P2=0xAA;

Delay(i);P2=0x55;

Delay(i);

}}

void Delay(){

ui j;

for(j=0;j


4/25

/***********************************************************************

Program 4:Write a program,when switch is pressed LEDs are blinking?

***********************************************************************/

Algorithm:1.First,we define P2 to LED.

2.define a switch for P1_1.

3.Continuously press the switch to toggle LEDs.

Program:

#include#define LED P2

#define SW P1_1

void main()

{P1_1=1;

while(1)

{

if(P1_1==1){

P2=~P2;

}}

}

/***********************************************************************

OUTPUT:We observed that,switch is pressed LEDs are blinking.

***********************************************************************/

4


5/25

/***********************************************************************

Program 5:Write a program,when switch is pressed 3 times toggle LEDs?

***********************************************************************/

Algorithm:1.First,we define P2 to LED.

2.define a switch for P0_4.

3.Repeat the loop 3 times for pressing the switch.

4.Toggle the LEDs after the switch 3 times pressed.

Program:

#include#define LED P2

#define SW P0_4

void main()

{ui i;

while(1)

{

for(i=0;i


6/25

TIMERS & COUNTERS

/***********************************************************************

Program 1:Write a program to toggle all the LEDs with 500ms delay using

Timer0, mode1?

***********************************************************************/

Algorithm:

1.To set the values of TMOD.

2.Toggle all LEDs with 500ms delay.

Program:

#include

#define LED P2

void Delay_500ms();

void main()

{while(1)

{

P2=0x55; //toggle all the bits of P2Delay_500ms();

P2=0xAA; //toggle all the bits of P2

Delay_500ms();}

}

void Delay_500ms(){

TMOD=0x01; //timer0,mode 1

TL1=0xFE; //load TL1TH1=0xA5; //load TH1

TR0=1; //start timer

while(!TF0); //wait for TF0 to roll over

TR0=0; //stop timerTF0=0;

}

/***********************************************************************

OUTPUT:We observed that, all the LEDs are toggling with 500ms delay.

***********************************************************************/

6


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8/25

/***********************************************************************

Program 3:Write a program for counter 0,in mode 2 to count the switchpressing and display

that on P2?

***********************************************************************/

Algorithm:

1.To set the values of TMOD.2.To count the switch pressing and display that on Port 2.

Program:

#include

#define SW P1_4

ui count;

void main(){

TMOD=0x06;TH0=0x00;

while(1)

{

do{

if(SW==0)

{count++;

P2=count;

SW=1;}

}

while(TF0==0);

TR0=0;TF0=0;

}

}

/***********************************************************************

OUTPUT:We observed that,counting the switch pressing and displayed on

Port 2.

***********************************************************************/

8


9/25

/***********************************************************************

Program 4:Write a program for 50ms delay using timer 0 mode 1 to togglethe LEDs?

***********************************************************************/

Algorithm:

1.To set the values of TMOD.2.Using 50ms delay,toggle the LEDs.

Program:

#define

void Delay_50ms();

void main()

{while(1)

{

P2=0x00;Delay_50ms();

P2=~P2;

Delay_50ms();

}}

void Delay_50ms()

{TMOD=0x01; //timer 0,mode 1

TH0=0x3C;

TL0=0xB0;TR1=1; //timer start

while(!TF0);

TR0=0; //stop timer

TF0=0;}

/***********************************************************************OUTPUT:We observed that,to toggle all the LEDs with 50ms delay.

***********************************************************************/

9


10/25

SERIAL COMMUNICATION

/***********************************************************************

Program 1:Write a program to transfer the single letter serially?

***********************************************************************/

Algorithm:1.To set the values of TMOD and SCON.

2.To send the data serially.

Program:

#include

void Sconfig();void Send_char(uc);

void main()

{

Sconfig();Send_char('A');

}

void Sconfig(){

SCON=0x50;TMOD=0x20;TL1=0xFD;

TH1=0xFD;

TR1=1;}

void Send_char(uc dt)

{SBUF=dt;

while(!TI);

TI=0;

}

/***********************************************************************

OUTPUT:We observed that,transmitted a single letter only.

***********************************************************************/

10


11/25

/***********************************************************************

Program 2:Write a program to transfer the word serially?

***********************************************************************/Algorithm:

1.To set the values of TMOD and SCON.


Program:

#include

void Sconfig();

void Send_char(uc);

void main(){

Sconfig();

Send_char('W');

Send_char('E');Send_char('L');

Send_char('C');Send_char('O');

Send_char('M');

Send_char('E');

}

void Sconfig()

{SCON=0x50;

TMOD=0x20;

TL1=0xFD;TH1=0xFD;

TR1=1;

}void Send_char(uc dt)

{

SBUF=dt;

while(!TI);TI=0;

}

/***********************************************************************OUTPUT:We observed that,transmitted the word serially.

***********************************************************************/

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12/25

/***********************************************************************

Program 3:Write a program to transfer the string serially?

***********************************************************************/Algorithm:



Program:

#include

void Sconfig();

void Send_char(uc);void Send(uc *);

void main()

{ Sconfig();

Send("RAGHU");while(1);

}

void Sconfig(){

TMOD=0x20; //timer 1,mode 2

TH1=0xFD;

TL1=0xFD;SCON=0x50;

TR1=1; // start timer

}void Send(uc *str)

{

while(*str){

Send_char(*str);

str++;

}}

void send_char(uc *mybyte)

{SBUF=*mybyte;

while(!TI);

TI=0;}

/***********************************************************************

OUTPUT:We observed that,the data can be send serially.

***********************************************************************/

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13/25

/***********************************************************************

Program 4:Write a Program to receive the data serially?

***********************************************************************/

Algorithm: 1.To set the values of TMOD and SCON.

2.To receive the data serially.

Program:

#include

void Sconfig();

void Read_char();

void main()

{

Sconfig();Read_char();

}

void Sconfig()

{TMOD=0x20; //timer 1,mode 2

TH1=0xFD;

TL1=0xFD;

SCON=0x50;TR1=1; // start timer

}

void Read_char()

{

uc dt;while(!RI);

dt=SBUF;

RI=0;

}

/***********************************************************************

OUTPUT:We observed that,the data canbe received serially.

***********************************************************************/

/***********************************************************************

13


14/25

Program 5: Write a program to send the data and as well as receive the

data serially?

***********************************************************************/

Algorithm:


2.To send the data and receive the data serially.

program:

#include

void Read_char(void);

void Send_char(uc);

void Send(uc *);void Sconfig();

void main(void)

{

Sconfig();Send("Raghu");

Read_char();

while(1);

}

void Sconfig()

{SCON=0x50;

TMOD=0x20;

TL1=0xFD;TH1=0xFD;

TR1=1;

}

void Send(uc *str)

{while(*str)

{

Send_char(*str);str++;

}

}

void send_char(uc *mybyte)

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15/25

{

SBUF=*mybyte;

while(!TI);TI=0;

}

void Read_char(void)

{

uc dt;while(!RI);

dt=SBUF;

RI=0;

}

/***********************************************************************

OUTPUT:We observed that,the data canbe send and received serially.

***********************************************************************/

15


16/25

INTERRUPTS

/***********************************************************************

Program 1: Write a program to get the single bit of data from P1_7 andsends it to P1_0 continuously. While simultaneously create a square wave of

200 micro second on P2_5, using timer 0, mode 2?

***********************************************************************/

Algorithm:1.To set the value of TMOD, and enable the interrupt, start the

timer.

2.When you switched ON, the LED is blinking and at the same

timethe corresponding wave form is generated.

Program:

#include

#define SW P1_7

#define LED P1_0#define WAVE P2_5

void time();

void timer0(void) interrupt 1

{

WAVE=~WAVE; //toggletime();

}

void main()

{

time();

while(1){

LED=~SW; //send to switch

}}

void time(){

TMOD=0x02; //timer 0,mode 2

TL0=0xA4;

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17/25

TH0=0xA4;

IE=0x82; //enable interrupts for timer 0

TR0=1;}

/***********************************************************************

OUTPUT: We observed that, when you switched ON, the LED is blinking and

Square wave generated with 200 micro seconds.

***********************************************************************/

17


18/25

/***********************************************************************

Program 2: Write a program to get the single bit of data from P1_7 andSends it to P1_0

***********************************************************************/

Algorithm:

1.Set the values of TMOD and SCON and Initialize the interrupts.2.Continuously toggling the LED, when the time is completed the

the square wave will be generated.

3.When the serial interrupt is enabled with TI or RI, Transmitting

and Receiving is done.

Program:

#include

#define WAVE P1_2

void timer0(void) interrupt 1{

WAVE=~WAVE; //toggle

}

void serial0(void) interrupt 4

{

if(TI==1){

SBUF='D';

TI=0;}

else

{

P2=SBUF;RI=0;

}

}

void main(){

TMOD=0x22;

TH0=0xA4;

SCON=0x50;TR0=1;

TR1=1;

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IE=0x92;

while(1)

{P1_3=~P1_3;

}

}

/***********************************************************************

Output: We observe that, generate a square wave and serial

communication using interrupts.

***********************************************************************/

19


20/25

LCD

/***********************************************************************

Program 1: Write a program to get the single bit of data from P1_7 and

sends it to P1_0

***********************************************************************/

Algorithm:

1.Initialize the

2.Set the command

#include

#include

#define DATA P2#define EN P1_2

#define RW P1_1#define RS P1_0

#define cmd 0

#define dat 1#define EN2 P1_7

void LCD_INIT();void LCD_CMD(uc,uc);

void lprintf(uc *st);

void Delay(ui);

void main(void)

{

uc *ijk="RAGHU";LCD_INIT();

lprintf( ijk);

while(1);}

void LCD_INIT()

{LCD_CMD(0x38,cmd);

LCD_CMD(0x01,cmd);

LCD_CMD(0x06,cmd);LCD_CMD(0x0e,cmd);

LCD_CMD(0x80,cmd);

Delay(1);}

void LCD_CMD(uc c,uc k)

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{

DATA=c;

RS=k;RW=0;

EN=1;

_nop_();EN=0;

EN2=0;

_nop_();EN2=1;

// Delay(1);

}

void lprintf(uc *r)

{

while(*r){

LCD_CMD(*r,dat);r++;

}

}

void Delay(ui n)

{ui d;

while(n--)

for(d=0;d


22/25

/***********************************************************************

Program 2: Write a program to scroll a string to right side

continuously in 2 lines?**********************************************************************/

#include

void main(){

LCD_init();

while(1)

{

unsigned char j,i;

for(j=0xc0;j=0x80;i--)

{

LCD_write(i,CMD);Lprintf("kisi");

LCD_write(0x01,CMD);

}}

}

//*LCD_write(i,CMD);*//

//* LCD_write(0x01,CMD);*//

TMOD=0x01;TH1=0xD8;

TL1=0xf0;

TR0=1;while(!TF0);

TR0=0;

TF0=0;}

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/***********************************************************************

Program 3: Write a program to scroll a string to right side

continuously in 2 lines with some time delay?***********************************************************************/

#includevoid main()

{

LCD_init();

while(1)

{

{

unsigned char j,i;


{

LCD_write(i,CMD);

TMOD=0x01;TH1=0xD8;

TL1=0xf0;

TR0=1;while(!TF0);

TR0=0;

TF0=0;Lprintf("kisi");


while(1);

TMOD=0x01;TH1=0xD8;

TL1=0xf0;

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TR0=1;

while(!TF0);

TR0=0;TF0=0;

}

}}

}

}

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/***********************************************************************

Program 4: Write a program to scroll a string to right sidecontinuously, first line should scroll once for every full scroll of the other

line?

***********************************************************************/

#includevoid main()

{

LCD_init();

while(1)

{

unsigned char j,i;


{

LCD_write(i,CMD);Lprintf("kisi");


}}

}

//*LCD_write(i,CMD);*//

//* LCD_write(0x01,CMD);*//

TMOD=0x01;TH1=0xD8;

TL1=0xf0;

TR0=1;while(!TF0);

TR0=0;

TF0=0;

}

8051 practice programs

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