#include <p24fj64ga002.h>

#define BRATE  25			//38.4K
#define U_ENABLE 0x8000		// enable the UART peripheral
#define U_TX	 0x0400		// enable transmission

void initU2( void)
{				

  	PADCFG1 = 0x00FC;		 
	AD1PCFG =0xffff;
	

__builtin_write_OSCCONL(OSCCON & 0xbf) ; 

RPINR19bits.U2RXR = 13;	// make pin RP13  U2RX
RPOR7bits.RP15R =5;  //make RP15 U2TX

__builtin_write_OSCCONL(OSCCON | 0x40) ; 


	_BRGH =0;	
	U2BRG = BRATE;
	U2MODE 	= U_ENABLE;
	U2STA 	= U_TX;

} 
int putU2( int c)
{

	while ( U2STAbits.UTXBF);   
	U2TXREG = c;
	return c;
} 



char getU2( void)
{
	while ( !U2STAbits.URXDA);	
	return U2RXREG;		
}


main()
{
    char c;

	LATB = 0;
	TRISB = 0;
	
	TRISBbits.TRISB13 = 1;
	
    TRISBbits.TRISB15 = 0;
 
	initU2();

	while (1)
	{
		c = getU2();

		if(c == 65){
			LATBbits.LATB3 = 1;
		}
		else{
			LATBbits.LATB3 = 0;
		}

		putU2(65);		
	}
}