关于STM32F103串口接收缓冲区的问题

繁星之下 · 发表于 2018-1-20 12:03:46

STM32F103串口2，接收到数据之后，再次发送数据串口接收缓冲区的数据没有被覆盖，接收不到数据了，这个怎么办？
void Usart2_Init(u32 bound)
{
  //GPIO¶Ë¿úéèÖÃ
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

//USART2_TX
  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);

  //USART2_RX
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

//¿aÆôó3éä
GPIO_PinRemapConfig(GPIO_Remap_USART2,ENABLE);

//USART 3õê¼»ˉéèÖÃ

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(USART2, &USART_InitStructure);
#if EN_USART2_RX
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
#endif
  USART_Cmd(USART2, ENABLE);

}

245925587 · 发表于 2018-1-21 16:17:23

繁星之下发表于 2018-1-21 15:21
传了，麻烦看下，谢谢！！！！

仿真看到，你LCDshownum函数里内的temp值会改变啊，每次串口发送不同的数据都会做出相应的改变

245925587 · 发表于 2018-1-21 10:37:06

看下你的中断函数吧

245925587 · 发表于 2018-1-21 10:38:01

数据保存在数组里，完成一次接受后，计数标志有没清零

繁星之下 · 发表于 2018-1-21 11:14:36

245925587 发表于 2018-1-21 10:38
数据保存在数组里，完成一次接受后，计数标志有没清零

void USART2_IRQHandler(void)
{
#ifdef OS_TICKS_PER_SEC
OSIntEnter();
#endif
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
{
   while(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET){}
   data[0]=(USART_ReceiveData(USART2) & 0x7F);
   USART_SendData(USART2,data[0]);

   USART_ClearITPendingBit(USART2,USART_IT_RXNE);
}
else
{
data[0]=0;
USART_ClearITPendingBit(USART2,USART_IT_RXNE);
}

#ifdef OS_TICKS_PER_SEC
OSIntEnter();
#endif

}