Question

Hello Everyone .

I hope you are doing well .

This is my question :

Question I: Write a C-program to receive a character from a PC to PIC16F877a Microcontroller with a baud rate 19200 and a frequency of 10MHz using serial communication. 1. Write and compile the Program Using MPLAB X. 2. Simulate the system using ISIS proteus and show the simulation results.

THANK YOU.

Answer 1

Solution :-

Note : Check attached image for simulation output.

Simulation tested in Proteus ISIS. Code compiled in MPLAB IDE.

Program Plan :

first set uart at baudrate 19200 .

check data available or not if available send data to PORTD .

Proteus Connection :

Connect virtual port to virtual terminal .

connected virtual terminal RX in to RX pin of microcontroller

connect 8 led to PORTD so we can see output on LED and virtual terminal

I am program a PIC board to send a character each second 'A' connected to COM3 so virtual port will take data at COM3.

Program :-

#include <xc.h> // x c 8 compiler

#include <pic16f877a.h>

#define _XTAL_FREQ 10000000 // uC frequency 10 mhz

char uartInit(long int baudRate);

char uartRxAvailable(void);

char serialReceive(void);

void main()

{

TRISD = 0x00; //PORTD as Output

uartInit(19200); //start uart at baud rate 19200

do

{

if(uartRxAvailable()) //check if data available

PORTD=serialReceive(); //receive char and send it to PORTD

__delay_ms(500);

PORTD=0x00; //set all led low on PORTD

}while(1);

}

char uartInit(long int baud)

{

//F_CPU= uC FREQUENCY

unsigned int value;

//BAUDRATE = XTAL(64(x+1)) //XTAL=10mhz

value = (_XTAL_FREQ - baud*64)/(baud*64);

if(value>255)

{

// if value more than 255 than enable high speed uart

//so baud=FOSC/16(x+1)

value = (_XTAL_FREQ - baud*16)/(baud*16);

SPBRG=value;

BRGH = 1; //enable high speed uart baud rate

}

if(value<256)

{

SPBRG = value;

SYNC = 0; //0 means asynchronous mode of uart

SPEN = 1; //enable uart

TRISC7 = 1; //pin rc7 as uart comm.

TRISC6 = 1;

CREN = 1; //enable rx pin

TXEN = 1; //enable tx pin

return 1;

}

return 0;

}

char uartRxAvailable(void)

{

return RCIF; //if RCIF flag is set means data is available

}

char serialReceive(void)

{

while(!RCIF); //wait for flag clear and get data from rx register

return RCREG;

}

Schematic :-

P1 RXD TXD U1 13 14 RTS OTOTOTOTO 10.0.0.0 1 6 DCD DSR 2 RXD 7 RTS 3 TXD 8 CTS 4 DTR 9 RI 5 ERROR O COMPIM D1 <TEXT 33 34 35 36 37 38 39 40 CTS X1 HOH 2 3 4 5 6 7 C2 22pF <TEXT> 9 10 OSC1/CLKIN RBO/INT OSC2/CLKOUT RB1 RB2 RADIANO RB3/PGM RA1/AN1 RB4 RAZIANZ/VREF-ICVREF RB5 RA3/AN3/VREF+ RB6/PGC RA4/TOCKI/C1OUT RE7/PGD RAS/AN4/SS/C2OUT RCO/T10SO/T1CKI REO/ANS/RD RC1/T10SI/CCP2 RE1/ANG/WR RC2/CCP1 RE/ANTICS RC3/SCK SCL RC4/SDUSDA MCLR/pp/THV RCS/SDO RC6/TX/CK RCT/RXIDT C1 CRYSTAL <TEXT 22pF <TEXT 두 8 VDD 15 16 17 18 23 24 25 26 LED-YELLOW D2 1 TEXT 4 VSS LED-YELLOW D3T> RDO/PSPO RD1/PSP1 RD2/PSP2 RD3/PSP3 RD4/PSP4 RDS/PSPS RD6/PSP6 RD7/PSP7 19 20 21 22 27 28 29 30 LED-YELLOW STEXTS D4 PIC16F877A <TEXT> LED-YELLOW D5 LED-YELLOW <TEXT> Kם esanale Pont chant 1

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