stm32f030的串口Usart发送接收不正常，求高手指点！

alisa

我在调试stm32f030的串口usart时，我还没有发送任何数据就能进一次接收中断，然后进一次发送中断，然后就在进不来了，不知道什么原因，找了好久了都没找出来到底是哪里错了，求高手指点，谢谢！程序代码如下：
void USART1_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef  NVIC_InitStructure;

/* Enable GPIO clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Enable USART clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* Connect PA9 to USART1_Tx */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);  
/* Connect PA10 to USART1_Rx */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
  
/* Configure USART Tx and Rx as alternate function push-pull */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Enable the USART1 gloabal Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* USARTx configuration ----------------------------------------------------*/
/* 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 = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
/* When using Parity the word length must be configured to 9 bits */
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);
  
/* Enable USART Receive data register not empty interrupt */
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
  
/* Enable USART */
USART_Cmd(USART1, ENABLE);
/* Clear Transmission complete flag */
USART_ClearFlag(USART1, USART_FLAG_TC);
}
int main()
{
  USART1_Configuration();
while(1)
{

}
}
void USART1_IRQHandler(void)
{
  if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //????
{
  test = USART_ReceiveData(USART1);
  USART_ITConfig(USART1, USART_IT_TC, ENABLE);
  USART_SendData(USART1,test);
  USART_ClearITPendingBit(USART1, USART_IT_RXNE);
  Usart1_rec_ok = 1;
}
if(USART_GetITStatus(USART1, USART_IT_TC) != RESET)
{
  USART_SendData(USART1,'1');
  USART_ITConfig(USART1, USART_IT_TC, DISABLE);
  USART_ClearITPendingBit(USART1, USART_IT_TC);
  Usart1_send_ok = 1;
}
}

Blyss89

使能串口和使能串口中断反了吧。

27595746@qq.com

初始化串口的时候会进中断，两个if都会进，最后执行了这句话USART_ITConfig(USART1, USART_IT_TC, DISABLE);
个人意见，仅供参考。

alisa

是硬件板子的问题，程序没问题的。谢谢各位支持！