[SOLVED] problem with UART RECEPTION: using dsPIC30F2020, matlab, FT232 & c30 compiler

#include<p30f2020.h>
#include<libpic30.h>
#include"delay.h"

_FOSC(CSW_FSCM_OFF & OSC2_IO & HS );
_FOSCSEL(PRIOSC_PLL);
_FWDT(FWDTEN_OFF);
_FGS(CODE_PROT_OFF);
_FPOR(PWRT_OFF);

int rx_flag, tx_flag;

//UART Initialize and rs232 routines 115200 baud

// Function prototypes
void _ISR _U1RXInterrupt(void);
void _ISR _U1TXInterrupt(void);
void initUart(void);

void initUart(void)
{
    	U1MODEbits.UARTEN=  0;    //UART1 Disabled
	U1MODEbits.ALTIO =  1;   // Use alternate IO
	U1MODEbits.BRGH =   0;    //Use High Bit rate
	U1MODEbits.PDSEL =  0;;    //8 bit no parity
        U1MODEbits.STSEL =  0;    //One stop bit
    
        IPC2bits.U1RXIP =5;//Set UART1 RX Int Priority 
	IPC2bits.U1TXIP =4;//TX Priority 
	IFS0bits.U1RXIF =0; //Set UART1 RX Int Flag=0
    
    
        U1STAbits.UTXISEL0 = 0; 
        U1STAbits.UTXISEL1 = 0; 
	U1STAbits.UTXBRK  = 0; 
	U1STAbits.URXISEL = 0;
    
       //U1BRG = (FCY/16*Baud Rate)-1 WITH BRG
       //FCY = FCY = Primary Osc X 2 WITH PLL 
       U1BRG = 16; // 115200 baud  16 MHz Crystal BRGL
    
	U1MODEbits.UARTEN=  1;    //UART1 Enabled
      
        IEC0bits.U1RXIE = 1;//Enable UART1 Receiver Interrupt
 	IEC0bits.U1TXIE = 1;//Enable UART1 Tx Interrut
	
	U1STAbits.UTXEN   = 1;   // Enable transmit
    
} 

void __attribute__((__interrupt__, __auto_psv__)) _U1RXInterrupt(void)
{  
    rx_flag=1;
    _U1RXIF=0; //clear RX Interrupt Flag
}

void __attribute__((__interrupt__, __auto_psv__)) _U1TXInterrupt(void)
{
	tx_flag=1;
	_U1TXIF=0; //clear TX Interrupt Flag
}

int main()
{
 _TRISB0 = 0;
 delay_us(100);
 while(1)    
 {
     if(rx_flag==1)
     {
         _LATB0=1;
     };
 }
 
 return(0);
}

clc
clear all

s = serial('COM3');
set(s,'BaudRate',115200);
fopen(s);

% ENTER PIC RELATED CODE HERE
a= 001;
fwrite(s,a,'int8','async');
x=1;
k=fread(s);
disp(k);

pause(5);
fclose(s)
delete(s)