UART communication using intrrupt on PIC16F886

#include <htc.h>
#include <stdio.h>
#include<pic.h>
//#include<stdint.h>
#include"delay.h"

#define _XTAL_FREQ 80000000
unsigned int i=0;

unsigned char get_value;


unsigned char c=0;
unsigned char ch;

#define SBIT_TXEN     5
#define SBIT_SPEN     7
#define SBIT_CREN     4




#define LED RC2
#define LED_RX RC7  // Pin assigned RX LED
#define LED_TX RC6  // Pin assigned TX LED
#define DE RC5


#define RECEIVE	     	0
#define TRANSMIT 		1
#define READ_REG    	3
#define WRITE_REG  		6
#define ILLEGAL_DATAVALUE 0x03
#define FALSE  			0
#define TRUE 			1
#define METER_ID        1
unsigned short int cnt, num,Dgt=0;

unsigned int j=0;
unsigned char* str;
unsigned int count = 0;
char data = 0;
unsigned char rxbuf[50];
unsigned char ser_data[95];
unsigned char crc_data[95];
unsigned char Max_scroll = 0;
unsigned char buff[10];
//volatile uint8_t index = 0, rec_flag = 0, Delay_count = 0, Id[10], Buffer_count = 0, Cal_count = 0, Disp_count = 0, inc = 0, One_sec_update = 0, Auto_scroll_count = 0;
char data1[10];
unsigned char buf[20];
unsigned int index=0;
unsigned int rec_flag = 0;


//__CONFIG( HS_OSC & WDTE_OFF & PWRTE_ON & CP_OFF & BOREN_ON & LVP_OFF & CPD_OFF  & DEBUG_OFF);

__CONFIG( FOSC_HS & WDTE_OFF & PWRTE_ON & CP_OFF & BOREN_ON & LVP_OFF & CPD_OFF  & DEBUG_OFF);


void Serial_1_Send_byte(unsigned char  trbuf1) {
	TXREG=trbuf1;
	while(0==TRMT);
}


char Serial_Receive_byte() {

	while(!RCIF);
	return RCREG;

}

void Send_string_uart1(const unsigned char *string) {
	unsigned char i=0;

	do {
		TXREG=string[i++];
		while(TXIF==0);
		TXIF=0;
	} while(string[i]!='\0');
}

void interrupt isr(void) {
	unsigned char ch;

	//ch=RCREG;
//	Serial_1_Send_byte(ch);
	__delay_ms(5);
	if((PIE1bits.RCIE==1)&&(PIR1bits.RCIF=1)) {
		PIR1bits.RCIF=0;
		//Send_string_uart1("UART TEST");
		// Send_string_uart1("\n");
		//Serial_1_Send_byte(10);
		ch=RCREG;
		Serial_1_Send_byte(ch);
		index++;
		if(index>=20) {
			index=0;
		}
		if(index>=8) {
			rec_flag = 1;
			DE=1;
		}

	}



	if(1==RCSTAbits.FERR) {
		RCSTAbits.SPEN=0;
		RCSTAbits.SPEN=1;
	}
	if(1==RCSTAbits.OERR) {
		RCSTAbits.CREN=0;
		RCSTAbits.CREN=1;
	}

}



void Serial_1_Init() {

	BRG16=1;//1-> 16 bit   0-> 8 bit
	SYNC=0; //0->ASYN 1-SYNC
	BRGH=1;// 0 for LOW baudrate 1 for High
	SPBRG = 207;

	RCIDL=1;
	TXEN=1;//1->Transmit enable 0-> transmit disble
	SPEN=1;//1->enable serial port 0->disable
	CREN=1; //1-> enable continous receive  0-> disble receiver
	INTCON = 0X00;
	TRMT=1;// 1-> Transmit register is empty 0-> full
	CCP1IE=1;
	RCIE=1;
	RCIF=0;
	// TXEN=0;//1->Transmit enable 0-> transmit disble


}





void Timer1_Interrupt() {

	INTCON = 0b00000000;
	PIE1=0b00000001;
	PIR1=0x01;
	TMR1H=0xF8;
	TMR1L=0xAD;
	T1CON=0x31;

}



void Init_Controller() {
	cnt=100;
	//OSCCON=0X71;

	TRISC  = 0x80;
	PORTC  = 0x80;
	TRISB=0X00;
	PORTB = 0X00;
	TRISA=0x00;
	PORTA=0x00;
	ADCON0= 0x00;
	ANSEL = 0b00000000;

	Timer1_Interrupt();

}



void main(void) {

	Init_Controller();
	Serial_1_Init();
	GIE=1;
	PEIE=1;
	TMR1IE=1;


	while(1) {


	}


}

#include "mcc_generated_files/mcc.h"
#define LED_RX RC7     // Pin assigned RX LED
#define LED_TX RC6    // Pin assigned TX LED
#define LED RC2     // Pin assigned for LED 
#define DE RC5
#define RECEIVE	     	0
#define TRANSMIT 		1
#define READ_REG    	3
#define WRITE_REG  		6
#define ILLEGAL_DATAVALUE 0x03
#define FALSE  			0
#define TRUE 			1
#define METER_ID        1
unsigned int j=0;
unsigned char* str;
unsigned int count = 0;
char data = 0;
unsigned char rxbuf[50], ser_data[100], crc_data[100], Max_scroll = 0;
unsigned char buff[10];
volatile uint8_t index = 0, rec_flag = 0, Delay_count = 0, Id[10], Buffer_count = 0, Cal_count = 0, Disp_count = 0, inc = 0, One_sec_update = 0, Auto_scroll_count = 0;
char data1[10];
unsigned char buf[20];
unsigned int k;

void Serial_1_Send_byte(uint8_t trbuf1) {
	TX1REG = trbuf1;

	while (0 == PIR3bits.TXIF);

//while (!TX1IF);

}


void Send_string_uart1(const unsigned char *string) {
	unsigned char i = 0;

	do {
		TX1REG = string[i++];
		while (0 == TX1STAbits.TRMT);
	} while (string[i] != '\0');
}

char Serial_Receive_byte() {

	while(0==PIR3bits.RCIF);
	return RC1REG;

}

char usart_RxString() {

	while(*str !='\0') {
		// while not end of string
		while(0==PIR3bits.RCIF);
		RCREG = *str;            // read next character
		str++;                    // increment pointer to next character
	}
	return RC1REG;    // return the contents of uart
}


void UART_ISR() {
	if((PIE3bits.RCIE==1)&&(PIR3bits.RCIF=1)) {
		PIR3bits.RCIF=0;
		rxbuf[index] = Serial_Receive_byte();
		Serial_1_Send_byte(rxbuf[index]);
		index++;
		if(index>=20) {
			index=0;
		}
		if(index>=8) {
			rec_flag = 1;
			DE=1;
		}

	}



	if(1==RCSTA1bits.FERR) {
		RCSTA1bits.SPEN=0;
		RCSTA1bits.SPEN=1;
	}
	if(1==RCSTA1bits.OERR) {
		RCSTA1bits.CREN=0;
		RCSTA1bits.CREN=1;
	}

}


void main(void) {
	// Initialize the device
	SYSTEM_Initialize();

	while (1)

	{
		__delay_ms(100);

	}

//}

}