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/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32f10x_conf.h"
#include <stdio.h>
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
 USART_InitTypeDef USART_InitStructure;
 GPIO_InitTypeDef GPIO_InitStructure;

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
void UART_Configuration(void)
{
/* Enable USART1 clocks */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);

  /* Configure USART1_Tx as alternate function push-pull */
  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 input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  /* USARTx configured as follow:
        - BaudRate = 115200 baud 
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 115200;
  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;

//  STM_EVAL_COMInit(COM1, &USART_InitStructure);
  /* Configure the USARTx */
  USART_Init(USART1, &USART_InitStructure);
  /* Enable the USARTx */
  USART_Cmd(USART1, ENABLE);
}

/**
  * @brief  Retargets the C library printf function to the USART.
  * @param  None
  * @retval None
  */
int fputc(int ch, FILE *f)
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the USART */
  USART_SendData(USART1, (uint8_t) ch);

  /* Loop until the end of transmission */
  while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
  {}

  return ch;
}

#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  printf("Wrong parameters value: file %s on line %d\r\n", file, line);
  /* Infinite loop */
  while (1)
  {
  }
}
#endif
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/

2,main.c文件

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32f10x_conf.h"
#include <stdio.h>
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
extern void UART_Configuration(void);
/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
 /* Setup STM32 system (clock, PLL and Flash configuration) */
  SystemInit();

  UART_Configuration();

  /* Output a message on Hyperterminal using printf function */
  printf("\n\r\n\r\n\r\n\r");
  printf("*** STM32-MDK V1.0 Build by yuanxihua@21cn.com on ("__DATE__ " - " __TIME__ ")\n\r");
  printf("*** STM32-MDK V1.0 Rebooting ...\n\r");

  /* Add your application code here
     */

  /* Infinite loop */
  while (1)
  {
  }
}
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/