简化以后的主程序如下   #include "stm32f10x_lib.h" #include "USART.h"
 ErrorStatus HSEStartUpStatus;
u8 Rxdata2[];
vu8 Rxnbr2;
GPIO_InitTypeDef GPIO_InitStructure;
void GPIO_Configuration(void)
{
    /* Configure USART1 Tx (PA.09) as alternate function push-pull */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_Init(GPIOA, &GPIO_InitStructure);
   
   /* Configure USART1 Rx (PA.10) as input floating */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
   GPIO_Init(GPIOA, &GPIO_InitStructure);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
   GPIO_Init(GPIOB, &GPIO_InitStructure);    }
//系统中断管理
void NVIC_Configuration(void)
{  
     NVIC_InitTypeDef NVIC_InitStructure;
   /* Configure the NVIC Preemption Priority Bits */ 
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);  #ifdef  VECT_TAB_RAM 
   /* Set the Vector Table base location at 0x20000000 */
   NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
 #else  /* VECT_TAB_FLASH  */
   /* Set the Vector Table base location at 0x08000000 */
   NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);  
 #endif  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
 
  /* Enable the EXTI15_10 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
} //配置系统时钟,使能各外设时钟
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
  RCC_DeInit();   /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);   /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();   if(HSEStartUpStatus == SUCCESS)
  {
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1);
 
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1);     /* PCLK1 = HCLK/2 */
    RCC_PCLK1Config(RCC_HCLK_Div2);     /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);     /* PLLCLK = 8MHz * 9 = 72 MHz */
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_4);     /* Enable PLL */
    RCC_PLLCmd(ENABLE);     /* Wait till PLL is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }     /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);     /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }
  
  /* Enable USART1 and GPIOA clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 |RCC_APB1Periph_USART2| RCC_APB2Periph_GPIOA, ENABLE);
}   //配置所有外设
void Init_All_Periph(void)
{
 RCC_Configuration(); 
 GPIO_Configuration();
 NVIC_Configuration();
 USART1_Configuration();  USART1Write((u8*)"AT ",sizeof("AT ")) ; } void Delay(vu32 nCount)
{
  for(; nCount != 0; nCount--);
}   int main(void)
{  
  Init_All_Periph();
 
}
然后我直接将usart的接收和发送短接在一起   中断程序为 extern u8 Rxdata2[];
extern vu8 Rxnbr2;
#define   counter_max   0xff
void USART1_IRQHandler(void)
{
 if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
 {  
  Rxdata2[Rxnbr2++] = (USART_ReceiveData(USART1));
  USART_ClearITPendingBit(USART1, USART_IT_RXNE);
  if(Rxnbr2 == counter_max|Rxdata2[Rxnbr2]=='')
    {
      /* Disable the USART2 Receive interrupt */       USART_ITConfig(USART2, USART_IT_RXNE, DISABLE);     }
   
 }
}   但是调试时接收的数据只有Rxdata2[0]，也就是只能就收到A，后面的没有。紧急求助啊 此帖出自小平头技术问答