File content as of revision 0:af6c8778c6ed:

#include "mbed.h"
#include <stdio.h>
#include <string.h>
DigitalOut red(LED1);
DigitalOut blue(LED3);
Serial pc(USBTX, USBRX);
Serial device(PTC15, PTC14);
unsigned char recivedchar[255];
int i=0; 

int main()
{
    red=1;
    blue=1;
    unsigned char rx;
    int sum=0;
    device.baud(9600);
    while(1) 
    {  
         if(device.readable()) 
        {
            for(i=0;i<255;i++)
            {
            rx = device.getc();
            recivedchar[i] =rx;
             sum=sum+rx;
            pc.printf("%c",rx);
           
            
            break;
            }
            pc.printf("%d",sum);
        }
        if(sum==73 || sum==110 || sum==97)
        {
            red=1;
            blue=0;
            pc.printf("Access Granted!");
        
        }
        else
        {
            red=0;
            blue=1;
                
        }
        sum=0;   
         }
            
    }