int main(void)
{
	
	
	STM_EVAL_LEDInit(LED3);
	STM_EVAL_LEDInit(LED4);
	STM_EVAL_LEDInit(LED5);
	STM_EVAL_LEDOn(LED4);
	
	//configure clock for USART
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
	//configure clock for GPIO
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
	//configure AF
	GPIO_PinAFConfig(GPIOD,GPIO_PinSource8,GPIO_AF_USART3);
	GPIO_PinAFConfig(GPIOD,GPIO_PinSource9,GPIO_AF_USART3);
	 
	//configure ports, &GPIO_InitStructure);
	 
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	 
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
	GPIO_Init(GPIOD, &GPIO_InitStructure);
	 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
	GPIO_Init(GPIOD, &GPIO_InitStructure);
	 
	USART_InitStructure.USART_BaudRate = 9600;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl =
	USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
	 
	USART_Init(USART3, &USART_InitStructure);
	 
	/* Enable USART */
	USART_Cmd(USART3, ENABLE);
	
	for(i=0; i<1000; i++){
	USART_SendData(USART3, 'x');
	while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET);
	}
//	do
//	{
//	    while(USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == RESET);
//		i++;
///*	} while((*/c = USART_ReceiveData(USART3)/*)!= 'x')*/;
	

	if(c == 'x')
		STM_EVAL_LEDOn(LED3);
	else
		STM_EVAL_LEDOff(LED4);			

	while(1);

}