我现在使用STM32F103VE芯片为平台的装置进行多机通信，采用USART1,串口485通信，modbus规约，一台主机，三台从机，软件识别地址，主机循环给三个从机发信，收到回信后才开始下一次发送使能，采用中断方式收发，现在遇到一个问题，通信一段时间后就中断了，硬件电路采用6N137光耦，接口芯片为SN75LBC184，初始化程序如下：
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_ITConfig(USART1, USART_IT_RXNE,DISABLE);
USART_ITConfig(USART1, USART_IT_TXE,DISABLE);
/* Configure USART1 Tx (PA.09) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART1 Rx (PA.10) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate =baud;
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(USART1, &USART_InitStructure);
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE,ENABLE);
USART_ITConfig(USART1, USART_IT_TXE,DISABLE);
USART_ITConfig(USART1, USART_IT_TC, DISABLE);
/* Enable USART1 */
USART_Cmd(USART1, ENABLE); |
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