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发表于 2023-9-12 14:55:23
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- GPIO_InitTypeDef GPIO_InitStructure;
- USART_InitTypeDef USART_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
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- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOD, ENABLE);//使能GPIOA,D时钟
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//使能USART2时钟
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //PD7端口配置
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOD, &GPIO_InitStructure);
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA2
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽
- GPIO_Init(GPIOA, &GPIO_InitStructure);
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,ENABLE);//复位串口2
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,DISABLE);//停止复位
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- #ifdef EN_USART2_RX //如果使能了接收
- USART_InitStructure.USART_BaudRate = bound;//波特率设置
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8位数据长度
- USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
- USART_InitStructure.USART_Parity = USART_Parity_No;///奇偶校验位
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//收发模式
- USART_Init(USART2, &USART_InitStructure); ; //初始化串口
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- NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //使能串口2中断
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //先占优先级2级
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级2级
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道
- NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
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- USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断
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- USART_Cmd(USART2, ENABLE); //使能串口
- #endif
- RS485_TX_EN=0; //默认为接收模式
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