void Exercise_04(void)
{
    /* Insert code here - 7 lines */
    if(Switch2IsPressed())
    {
        if(mUSBUSARTIsTxTrfReady())
        {
            output_buffer[0]=0x30;
            output_buffer[1]=0x31;
            output_buffer[2]=0x32;
            output_buffer[3]=0x33;
            mUSBUSARTTxRam((byte*)output_buffer,4);
        }
    }
    /* End */
	
}//end Exercise_04