本帖最后由 电子write_cai 于 2013-8-5 15:12 编辑
在串口应用中,我设置了发送中断使能,并指定了串口中断向量. 可是我并没有发送数据,怎么就进入中断去了.
如代码:
1:串口的初始化- RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOD,ENABLE);
- GPIO_PinRemapConfig(GPIO_Remap_USART2,ENABLE);
- RCC_APB1PeriphClockCmd (RCC_APB1Periph_USART2, ENABLE);
- /* Configure USART1 Rx (PD6) as input floating */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
- GPIO_Init(GPIOD, &GPIO_InitStructure);
- /* Configure USART1 Tx (PD5) as alternate function push-pull */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOD, &GPIO_InitStructure);
- USART_InitStructure.USART_BaudRate = 115200;
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
- USART_InitStructure.USART_StopBits = USART_StopBits_1;
- USART_InitStructure.USART_Parity = USART_Parity_No;//USART_Parity_Odd
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
-
-
- USART_Init(USART2, &USART_InitStructure);
- USART_ITConfig(USART2, USART_IT_TXE, ENABLE); //ʹÄÜ·¢ËÍÖжÏ
- //USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
-
- USART_Cmd(USART2, ENABLE);
2. 设置串口中断向量- void SetupNVIC(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- #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_InitStructure.NVIC_IRQChannel = USART2_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
3.中断向量函数- void USART2_IRQHandler(void)
- {
- unsigned int Receive_data;
- printf("\r\nUSART Interrupt is occur\r\n");
- if(USART_GetITStatus(USART2,USART_IT_RXNE) != RESET) //ÅжϷ¢Éú½ÓÊÕÖжÏ
- {
- printf("\r\nWaiting receive data\r\n");
- Receive_data = (USART_ReceiveData(USART2) & 0x7f);
- USART_ClearITPendingBit(USART2,USART_IT_RXNE); //Çå³ýÖжϱêÖ¾
- while(USART_GetITStatus(USART2,USART_IT_RXNE) == RESET)
- {
- //µÈ´ýÊý¾Ý½ÓÊÕ½áÊø;
- }
- USART_SendData(USART2,Receive_data);
- }
- //USART_ClearITPendingBit(USART2,USART_IT_TXE); //Çå³ýÖжϱêÖ¾
- }
|