Probleme mit USART von STM32VL

#include "stm32f10x.h"

#include "Configure.h"

int main(void)

{

  SystemInit();

  UART_INIT(2);

  int i,data;

  while(1)

  {

       while (USART_GetFlagStatus(USART2, USART_FLAG_RXNE)== RESET);

       data = USART_ReceiveData(USART2);

       if(data == '1')

       {

         while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);

         USART_SendData(USART2, 2);

       }

       //for(i = 0; i < 2000000; i++);

  }

  return 0;

}

// Function to initialize USART-Register, needs the information which UART to initialize

int UART_INIT(int uart_x)

{

    // Define a variable of the structure to initialize GPIO

    GPIO_InitTypeDef GPIO_InitStructure;

    // Define initialize structure for UART

    USART_InitTypeDef  USART_InitStructure;

    if(uart_x == 1)

    {

      // Enable clocks BEFORE using/configuring peripherals that expect them to be running

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

      // Enable UART peripheral by activating clock

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

      //Configure USART1 Tx as output floating with 50MHz

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

      GPIO_InitStructure.GPIO_Speed  = GPIO_Speed_50MHz;

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

      GPIO_Init(GPIOA, &GPIO_InitStructure);

      //Configure USART1 Rx as alternate function push pull

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

      GPIO_Init(GPIOA, &GPIO_InitStructure);

      USART_InitStructure.USART_BaudRate = 38400;

      USART_InitStructure.USART_WordLength = USART_WordLength_8b;  //Word Length = 8 Bits

      USART_InitStructure.USART_StopBits = USART_StopBits_1;  //Two Stop Bit

        USART_InitStructure.USART_Parity = USART_Parity_No ;   //No parity

      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;  //Hardware flow control disabled (RTS and CTS signals)

      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;  //Receive and transmit enabled

        //Configure USART

        USART_Init(USART1,&USART_InitStructure);

        //Enable USART

        USART_Cmd(USART1, ENABLE);

    }

    else if(uart_x == 2)

    {

      // Enable clocks BEFORE using/configuring peripherals that expect them to be running

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

      // Enable UART peripheral by activating clock

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

      //Configure USART2 Tx as output floating with 50MHz

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

      GPIO_InitStructure.GPIO_Speed  = GPIO_Speed_50MHz;

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

      GPIO_Init(GPIOA, &GPIO_InitStructure);

      //Configure USART2 Rx as alternate function push pull

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

      GPIO_Init(GPIOA, &GPIO_InitStructure);

      USART_InitStructure.USART_BaudRate = 38400;

      USART_InitStructure.USART_WordLength = USART_WordLength_8b;  //Word Length = 8 Bits

      USART_InitStructure.USART_StopBits = USART_StopBits_1;  //Two Stop Bit

        USART_InitStructure.USART_Parity = USART_Parity_No ;   //No parity

      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;  //Hardware flow control disabled (RTS and CTS signals)

      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;  //Receive and transmit enabled

        //Configure USART

        USART_Init(USART2,&USART_InitStructure);

        //Enable USART

        USART_Cmd(USART2, ENABLE);

    }

    else

      // If there is a failure, then return 2 to flash error led

      return 2;

    // If it is all okay

    return 0;

}