STM32F051芯片和STM32F103芯片之间使用USART通信，一次传两个数据还可以接收到，再多点就接收不到了，是为什么啊？？？

有道无界

STM32F051芯片和STM32F103芯片之间使用USART通信，一次传两个数据还可以接收到，再多了就接收不到了，波特率都是9600.

STM32F051  USART初始化程序如下：
void Uart_Init(u32 bound)
{

GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE); 
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE ); 
            
 USART_DeInit(USART1);  
 
//USART1_TX   PA.9?? USART1_RX  A.10
GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_1); 
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_1);  

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;                 
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
GPIO_Init(GPIOA, &GPIO_InitStructure);   


USART_InitStructure.USART_BaudRate = bound;
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(USART1, &USART_InitStructure); 

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; 
NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00; 
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
NVIC_Init(&NVIC_InitStructure); 
   
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); 

  USART_Cmd(USART1, ENABLE);       
}
 



STM32F103  USART初始化程序如下：
void uart_init(u32 bound){
    //GPIO?????è??
    GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
 
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //????USART1??GPIOA?±??
  USART_DeInit(USART1);  //?????®??1
//USART1_TX   PA.9
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //???????ì????
    GPIO_Init(GPIOA, &GPIO_InitStructure); //??????PA9
   
    //USART1_RX  A.10
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//????????
    GPIO_Init(GPIOA, &GPIO_InitStructure);  //??????PA10


   //USART ???????è??

USART_InitStructure.USART_BaudRate = bound;//??°??è????9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×??¤??8??????????
USART_InitStructure.USART_StopBits = USART_StopBits_1;//??????????
USART_InitStructure.USART_Parity = USART_Parity_No;//?????????é??
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//???????????÷????
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //??·?????

    USART_Init(USART1, &USART_InitStructure); //???????®??
#if EN_USART1_RX  //??????????????  
   //Usart1 NVIC ????
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//??????????3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×???????3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??????
NVIC_Init(&NVIC_InitStructure); //?ù?????¨????????????VIC?????÷
   
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//????????
#endif
    USART_Cmd(USART1, ENABLE);                    //?????®?? 

}

正点原子

仿真看看。。

有道无界

回复【2楼】正点原子:
---------------------------------
如果只发送两个数据，可以正常接收；但是如果让其发送四个数据或更多的数据，就需要等待10多秒，才能接收到。仿真能看到发送，但是看不到接收，好郁闷啊~~~