/*  Name     : main.c
 *  Purpose  : Source code for UART Interfacing with PIC18F4550.
 *  Author   : Gemicates
 *  Date     : 2017-06-23
 *  Website  : www.gemicates.org
 *  Revision : None
 */


#include<xc.h>                   // Header file for PIC18F4550
#define _XTAL_FREQ 12000000      // 12MHz

#pragma config FOSC = HS         // Oscillator Selection bits (HS oscillator (HS))
#pragma config WDT = OFF         // HW Disabled - SW Controlled
#pragma config WDT = OFF         // HW Enabled - SW Disabled
#pragma config BOR = OFF         // Brown out reset disabled<br><br>#pragma config BOR = SOFT       // Brown out reset controlled by SBOREN<br><br>#pragma config BOR = ON_ACTIVE  // Enabled when the device is not in SLEEP, SBOREN bit is disabled<br><br>#pragma config BOR = ON         // Brown out reset enabled, SBOREN bit is disabled
#pragma config LVP = OFF         // Low voltage programming mode OFF
#pragma config LVP = OFF         // Low voltage programming mode ON
#pragma config CPD = ON          // Data EEPROM Code protection ON
#pragma config WRTD = OFF        // Data EEPROM Write protection OFF
void main()                            
{
 TRISC7  = 1;                    // RC7(RX) configured as i/p                           
 TRISC6  = 1;                    // RC6(TX) configured as o/p                   
 TXSTA   = 0X20;                 // Transmission Enable(TXEN=1,SYNC=0,BRGH=1)   
 RCSTA   = 0X90;                 // Rception Enable (SPEN=1,CREN=1)             
 BAUDCON = 0X40;                 // Baudrate control Register                   
 SPBRG   = 0X12;                 // 9600 brgh=0                                 
 TXREG   = 'E';                  // Load the character to be transmitted         
 while(TRMT);                    // Wait here till transmission is complete     
 while(1)
 {
  if(RCIF==1)                    // Set when a character is received            
  {
   RCIF=0;                       // Clear Receive interrupt flag bit            
   RCREG = TXREG  ;              // Retransmit the received character           
   while(TRMT);                  // Wait here till transmission is complete     
  }
 }
}