[问答]

请问一下如何对STM32的多个串口进行初始化呢

问答对人有帮助，内容完整，我也想知道答案 0 请问一下如何对STM32的多个串口进行初始化呢？其代码该如何去实现呢？ 0
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答案对人有帮助，有参考价值 0 串口1： void Usart1_Init(u32 baud) { //GPIO端口设置 GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1\|RCC_APB2Periph_GPIOA\|RCC_APB2Periph_GPIOC, ENABLE);//使能USART1,GPIOA,C时钟 //USART1_TX GPIOA.9 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9 //USART1_RX GPIOA.10 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入 GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10 //Usart1 NVIC 配置 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级 0-3; NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3 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 //USART 初始化设置 USART_InitStructure.USART_BaudRate = baud;//串口波特率 USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式 USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位 USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位 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(USART1, &USART_InitStructure); //初始化串口1 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断 USART_Cmd(USART1, ENABLE); //使能串口1 } 串口2： void Usart2_Init(u32 baud) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; //\|RCC_APB2Periph_AFIO RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//使能GPIOA时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//使能USART2时钟 //PA2 TX GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽 GPIO_Init(GPIOA, &GPIO_InitStructure); //PA3 RX GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; 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 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级 0-3; 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 USART_InitStructure.USART_BaudRate = baud;//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 USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断接收 USART_Cmd(USART2, ENABLE); //使能串口 } 串口3： void USART3_Init(u32 baud) { USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; //声明一个结构体变量，用来初始化GPIO //使能串口的RCC时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE); //使能UART3所在GPIOB的时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); //串口使用的GPIO口配置 // Configure USART3 Tx (PB.10) as alternate function push-pull GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOB, &GPIO_InitStructure); // Configure USART3 Rx (PB.11) as input floating GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB, &GPIO_InitStructure); //串口中断配置 //Configure the NVIC Preemption Priority Bits NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // Enable the USART3 Interrupt NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //子优先级3 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); //配置串口 USART_InitStructure.USART_BaudRate = baud; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; // Configure USART3 USART_Init(USART3, &USART_InitStructure);//配置串口3 // Enable USART3 Receive interrupts 使能串口接收中断 USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); // Enable the USART3 USART_Cmd(USART3, ENABLE);//使能串口3 } 串口4： void UART4_Init(u32 baud) { USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);//for UART4 /* Configure USART Tx as alternate function push-pull / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOC, &GPIO_InitStructure); / Configure USART Rx as input floating / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOC, &GPIO_InitStructure); //UART4 NVIC 配置 NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;//抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3 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 USART_InitStructure.USART_BaudRate = baud; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No ; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; USART_Init(UART4, &USART_InitStructure); //USART_Init(USART3, &USART_InitStructure); / Enable the USART */ USART_Cmd(UART4, ENABLE); USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);//开启串口中断 USART_ClearFlag(UART4, USART_FLAG_TC); } 串口5： void UART5_Init(u32 baud) { USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE); //使能UART5，GPIOB时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC\|RCC_APB2Periph_GPIOD, ENABLE); //GPIOC/D时钟 USART_DeInit(UART5); //复位串口5 //UART5_TX PC12 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; //PC12 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init(GPIOC, &GPIO_InitStructure); //初始化PC12 //UART5_RX PD2 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;//上拉输入 GPIO_Init(GPIOD, &GPIO_InitStructure); //初始化PB11 //Uart5 NVIC 配置 NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;//抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3 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 //UART 初始化设置 USART_InitStructure.USART_BaudRate = baud; USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式 USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位 USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位 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(UART5, &USART_InitStructure); //初始化串口 USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);//开启中断 USART_Cmd(UART5, ENABLE); //使能串口 GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE); }

2021-12-15 09:16:45 评论举报李惠英