UART中断的问题

只看该作者 · 2008-7-1 09:06

/* Configure the USART1 */
  USART_Init(USART1, &USART_InitStructure);

  /* Enable the USART Transmoit interrupt: this interrupt is generated when the
     USART1 transmit data register is empty */
  USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
怎么执行到上面这句就直接进入UART_IT_TXE中断啦,还没有发送数据啊,也没接收数据,
um0427FWLibexamplesUSARTHyperTerminal_Interrupt中的例子,不解,麻烦大虾解释下,谢谢!

1万 · 2008-7-1 09:47

/* Enable the USART Transmoit interrupt: this interrupt is generated when the
USART1 transmit data register is empty */
USART_ITConfig(USART1, USART_IT_TXE, ENABLE);

当发送数据寄存器为空时将产生这个中断，还没有发送数据时，发送数据寄存器为空肯定为空，所以产生中断。

只看该作者 · 2008-7-1 09:59

USART_IT_TXE是UART发送完中断吧,
好象没有发送数据寄存器为空的中断哦,
香主帮看看呢

1万 · 2008-7-1 10:05

只看该作者 · 2008-7-8 15:40

USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_9b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_Even;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_InitStructure.USART_Clock = USART_Clock_Disable;
  USART_InitStructure.USART_CPOL = USART_CPOL_Low;
  USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
  USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
  USART_Init(USART3,&USART_InitStructure);
  USART_Cmd(USART3,ENABLE);
  USART_ITConfig(USART3, USART_IT_RXNE,ENABLE);
  USART_ITConfig(USART3, USART_IT_TXE,ENABLE);
  USART_ITConfig(USART3, USART_IT_TC,ENABLE);

//中断进不去，这样设置对吗？(现在只是发数)
//主程中用“   USART_SendData(USART3, 0x55);”向外发数据

UART中断的问题

这是对的

USART_IT_TXE是UART发送中断吧

你仔细看看那段英文注释，就是我说的意思

新问题，中断进不去

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