STM32串口通信配置（USART/UART）

static unsigned char TxBuffer[256];

static unsigned char TxCounter=0;

static unsigned char count=0; 

extern void CopeSerial1Data(unsigned char ucData);

void Initial_UART1(unsigned long baudrate)

{

          //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, ENABLE);

        //USART1_TX   GPIOA.9

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//复用推挽输出

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

        GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化   

   //USART1_RX   GPIOA.10

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入

        GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化

          

        USART_InitStructure.USART_BaudRate = baudrate;//设置波特率

        USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式

        USART_InitStructure.USART_StopBits = USART_StopBits_1;//1个停止位

        USART_InitStructure.USART_Parity = USART_Parity_No ;//无奇偶校验

        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

        USART_ITConfig(USART1, USART_IT_TXE, DISABLE);  

        USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //开启串口接受中断       

        USART_ClearFlag(USART1,USART_FLAG_TC);

        USART_Cmd(USART1, ENABLE);//使能

        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 7;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);

}

static unsigned char TxBuffer[256];

static unsigned char TxCounter=0;

static unsigned char count=0; 

extern void CopeSerial2Data(unsigned char ucData);

void Initial_UART2(unsigned long baudrate)

{

         GPIO_InitTypeDef GPIO_InitStructure;

        USART_InitTypeDef USART_InitStructure;

        NVIC_InitTypeDef NVIC_InitStructure; 

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 | RCC_APB2Periph_GPIOA, ENABLE);

        //PA2为TX

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

        GPIO_Init(GPIOA, &GPIO_InitStructure);  

        //PA3为RX  

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

        GPIO_Init(GPIOA, &GPIO_InitStructure);

         

        USART_InitStructure.USART_BaudRate = baudrate;

        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(USART2, &USART_InitStructure); 

        USART_ITConfig(USART2, USART_IT_TXE, DISABLE);    

        USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

        USART_ClearFlag(USART2,USART_FLAG_TC);        

        USART_Cmd(USART2, ENABLE);

        NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 8;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);

}

static unsigned char TxBuffer[256];

static unsigned char TxCounter=0;

static unsigned char count=0; 

extern void CopeSerial2Data(unsigned char ucData);

void Initial_UART3(unsigned long baudrate)

{

         GPIO_InitTypeDef GPIO_InitStructure;

        USART_InitTypeDef USART_InitStructure;

        NVIC_InitTypeDef NVIC_InitStructure; 

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3 | RCC_APB2Periph_GPIOA, ENABLE);

         RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);   // GPIOB时钟

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);

          USART_DeInit(USART3);

         //PB10为TX

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

        GPIO_Init(GPIOB, &GPIO_InitStructure);    

        //PB1为RX

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

        GPIO_Init(GPIOB, &GPIO_InitStructure);

         

        USART_InitStructure.USART_BaudRate = baudrate;

        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(USART3, &USART_InitStructure); 

        USART_ITConfig(USART3, USART_IT_TXE, DISABLE);    

        USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

        USART_ClearFlag(USART3,USART_FLAG_TC);        

        USART_Cmd(USART3, ENABLE);

        NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 8;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);

}