串口接收中断进不去

flashTianjiao · 发表于 2015-10-13 21:04:00

现在遇到一个奇怪的问题，STM32的串口接收中断进不去，接收标志位一直是RESET。但我用查询的方法是可以接收到数据的。Debug的时候，中断寄存器也打开了，我感觉配置是没有问题的，但一直找不到原因，请教大家。。代码如下（用的485协议）
1、初始化

[mw_shl_code=c,true]void USART_Configuration(unsigned long bound) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure ); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_Init(GPIOA, &GPIO_InitStructure ); //RS485 DIR位 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = bound; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_Init(USART2, &USART_InitStructure); USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); USART_ClearFlag(USART2,USART_FLAG_RXNE); USART_Cmd(USART2, ENABLE); NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;/ NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器 }[/mw_shl_code]

2、主函数

[mw_shl_code=c,true] SYS_Configuration(); //系统配置 PHO_DISP(hangdian);//显示图形杭电Logo delay_100ms(10); PHO_DISP(biankuang_PC);//显示边框PC工作模式 display( 1, 0, " mA"); display( 2, 0, " M"); display( 3, 0, " M"); GPIO_ResetBits(GPIOA, GPIO_Pin_1);//拉低485接收数据 USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); //开启UART2中断,放在485接收初始化之后，防止系统开机时出现乱码 IWDG_Enable(); GPIO_SetBits(GPIOA, GPIO_Pin_1);//拉高485发送数据 printf("USart ok\r\n"); delay_ms(1); GPIO_ResetBits(GPIOA, GPIO_Pin_1);//拉低485接收数据 delay_ms(1000); display(1,4,"0000"); while(1) { if(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) != RESET) { RxData = USART_ReceiveData(USART2); GPIO_SetBits(GPIOA, GPIO_Pin_1);//拉高485发送数据 printf("%d", RxData); delay_ms(1); GPIO_ResetBits(GPIOA, GPIO_Pin_1);//拉低485接收数据 delay_ms(1000); } }[/mw_shl_code]

3、中断函数

[mw_shl_code=c,true]void USART2_IRQHandler(void) //RS485接收中断 { u8 j; u16 RxData = 9999; if(USART_GetITStatus(USART2,USART_IT_RXNE) != RESET) { USART_ClearITPendingBit(USART2,USART_IT_RXNE); RxData = USART_ReceiveData(USART2); GPIO_SetBits(GPIOA, GPIO_Pin_1);//拉高485发送数据 printf("%d", RxData); delay_ms(1); GPIO_ResetBits(GPIOA, GPIO_Pin_1);//拉低485接收数据 delay_ms(1000); } }[/mw_shl_code]