Command FPGA using Matlab

Thanks,

I have implemented niosII on my fpga with the uart and serial device.

I have made a C program in order to send Hello World on serial port and it's successful.

#define RS232_UART_DATA ((volatile int*) 0x10001010)
# define RS232_UART_CONTROL ((volatile int*) (0x10001010+4))
int main()
{
    unsigned char hwld = {'H','e','l','l','o',' ','W','o','r','l','d','\0'};
    unsigned char *pOutput;
    pOutput = hwld;
    while(*pOutput) //strings in C are zero terminated
    {
         //if room in output buffer
         if((*RS232_UART_CONTROL)&0xffff0000  ) 
         {
            //then write the next character
            *RS232_UART_DATA = (*pOutput++); 
         }
     }
}

With this code my FPGA send "hello world" to my computer.

But now I would like to send information on my FPGA with serial port in order to control my FPGA.

I explain:

If I send '1' from my computer to the FPGA I would like that the LEDG(1) turn on.

If I send '2' the LEDG(2) turn on...

I don't know how to make it... I know that I have to take the information on RX but I don't know how to do it