STM32F103RBT6 串口2,3一直不能配置成功急求以例子望提鼠相助

ma_hao123 · 发表于 2014-3-5 15:45:34

主控芯片是STM32F103RBT6 就是MINI板的那种使用库函数，串口1成功工作，

对应COPY+修改生产串口2，3的初始化代码但是就是工作不正常，配置完成时会进一次中断

其后发送接收均无任何反应

代码贴上很碍眼就只发一下初始化代码

有跑通的求给例程可以帮我解决的就看下代码吧

RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_GPIOA, ENABLE);

//USART3_TX PB.10

A2

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

//USART3_RX

B.11 PA3

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,ENABLE);//

RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,DISABLE);//

NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

USART_InitStructure.USART_BaudRate = bound;//

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_Cmd(USART2, ENABLE);

USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

USART_ITConfig(USART2, USART_IT_TC, ENABLE);

kingbox568 · 发表于 2014-3-5 15:58:34

void USART2_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

/* config USART2 clock */ //在使用外设时，不仅要使能其时钟，还要调用此函数使能外设才可以正常使用
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);    // APB2Periph
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 , ENABLE);    // APB1Periph   注意：USART2 是 APB1Periph

/* USART2 GPIO config */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;              //PA2 TX
   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);

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;              //PA3 RX
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
   GPIO_Init(GPIOA, &GPIO_InitStructure);

/* USART2 mode config */
USART_InitStructure.USART_BaudRate = 9600; // 波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b; // 串口传输的字长:8位字长，也可以设置为9位
USART_InitStructure.USART_StopBits = USART_StopBits_1; // 停止位设置为1位
USART_InitStructure.USART_Parity = USART_Parity_No ; // 不设置奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;   // 不采用硬件流
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; // 配置双线全双工通讯，需要把Rx和Tx模式都开启
USART_Init(USART2, &USART_InitStructure); //填充完结构体，调用库函数USART_Init()向寄存器写入配置参数

    NVIC_InitStructure.NVIC_IRQChannel = USART2_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_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断

USART_Cmd(USART2, ENABLE); //调用USART_Cmd() 使能USART外设

}

void USART2_IRQHandler(void)
{

if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
{
USART_ClearITPendingBit(USART2,  USART_IT_RXNE);          //清除接收中断标志

    USART_SendData(USART2, USART_ReceiveData(USART2));    //将数据回送至超级终端

         while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);  //等待数据发送完毕

}
}

试试这个，自发自收，应该可以的。