各位帮忙看一下这段串口通信程序！！用的是USART3

ljhya

请问一下这个程序，用USART3的传送数据有没有问题？？？

volatile u8 USART_Received_Flag=0; 

u8 USART_RX_BUF[64];     //接收缓冲,最大64个字节.

//接收状态

//bit7，接收完成标志

//bit6，接收到0x0d

//bit5~0，接收到的有效字节数目

u8 USART_RX_STA=0;       //接收状态标记

void uart_init(u32 bound){

    //GPIO端口设置

    GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE); //使能UART3所在GPIOB的时钟

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //串口时钟配置

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

   

    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);

      // 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);

   //Usart1 NVIC 配置

    NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能

NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器USART3

  

   //USART 初始化设置

   

USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;

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_RXNE, ENABLE);//开启中断

   

    USART_Cmd(USART3, ENABLE);                    //使能串口 

}

void USART3_SendBytes(u8 * str,u32 DataLen) //传送一组字符

{

 

    while(DataLen)

    {

delay_us(10);

        USART_SendData(USART3, *str++);

        while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET);

DataLen--;

    }

}

void USART3_IRQHandler(void)                 //串口3中断服务程序

{

u8 Res;

if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)

{

Res =USART_ReceiveData(USART3);//(USART3->DR); //读取接收到的数据

USART_RX_BUF[USART_RX_STA]=Res ;

USART_RX_STA++;

if(USART_RX_STA>63)

{

USART_RX_STA=0;//接收数据错误,重新开始接收  

      USART_Received_Flag=1;

}  

     } 

} 

正点原子

自己测试下，就知道了。