请教STM32F207ZG串口配置

yuan_58

我在配置207ZG的串口时发现，我配置的波特率115200，但是输出的时候我用串口助手接收的时候波特率变成了38400，设置57600时接收为19200，其他均是乱码，有点头大请指教。下面是我的代码请指教：

void UART_GPIO_Config(void)

{

  GPIO_InitTypeDef GPIO_InitStructure; 

  

  /* Enable GPIOs clock */

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB, ENABLE);

  

  //Enable USART Clock

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

 /* GPIOD configuration */

 

   //Uart1 GPIO Config 

   GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1);

   GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);

   

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;

   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

   GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;

 

   GPIO_Init(GPIOB, &GPIO_InitStructure);

   //Uart2 GPIO Config 

   GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);

   GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);

  

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;

   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

   GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;

   GPIO_Init(GPIOA, &GPIO_InitStructure);

}

void UART_Init(void)

{

    USART_InitTypeDef USART_InitStructure;

//EXTI_InitTypeDef EXTI_InitStructure;

    NVIC_InitTypeDef NVIC_InitStructure;

UART_GPIO_Config();

USART_InitStructure.USART_BaudRate = 115200;

    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;

    //Initialize the USART1

USART_Init(USART1,&USART_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_Init(&NVIC_InitStructure);

//NVIC_Enable(USART1_IRQn);

/* Enable the USART1 Parity Error Interrupt */

USART_ITConfig(USART1,USART_IT_PE,ENABLE);

    /* Enable the USART1 Framing Error Interrupt */

USART_ITConfig(USART1,USART_IT_ERR,ENABLE);

/* Enable the USART1 Receive Interrupt */

USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);

    /* Enable the USART1 Transmit Interrupt */

//USART_ITConfig(USART1,USART_IT_TXE,ENABLE);

USART_Cmd (USART1,ENABLE);

//Initialize the USART2

USART_Init(USART2,&USART_InitStructure);

    //Confing USART2_IRQn

NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

NVIC_Init(&NVIC_InitStructure);

    /* Enable the USART2 Parity Error Interrupt */

USART_ITConfig(USART2,USART_IT_PE,ENABLE);

    /* Enable the USART2 Framing Error Interrupt */

USART_ITConfig(USART2,USART_IT_ERR,ENABLE);

/* Enable the USART2 Receive Interrupt */

USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);

 

USART_Cmd (USART2,ENABLE);

    //interrupt Config 

    //USART_Cmd(USART_TypeDef * USARTx,FunctionalState NewState);

}

/*****************************************************************************

** Function name: SendBytes

**

** Descriptions: 通过串口ch，发送一组数据

**

** parameters: ch：     串口通道号

                        buf：    需要发送的数据Buf

                        length： 需要发送的数据长度

                        timeout：发送超时的时间

** Returned value: 返回已经发送的数据个数

** 

*****************************************************************************/

uint16_t SendBytes(uint8_t ch, uint8_t *buf, uint16_t length, uint16_t timeout)

{

uint32_t  len=0;

uint32_t  i;

volatile uint16_t  timeoutCnt;

     

timeoutCnt = 0;

    for(i=0; i<length; i++)

    {

       timeoutCnt =0;

       //while(!USART_GetFlagStatus(COM_USART[ch],USART_FLAG_TXE))  //串口发送缓冲区空？

       while(!(COM_USART[ch]->SR&USART_FLAG_TXE))

       {

  //等待发送缓冲区空，如果在超时时间内还非空

          if(timeoutCnt>=timeout)  

     {

     timeoutCnt = 0; 

     return i;    //退出发送，返回发送数据的个数

 }

 timeoutCnt++;

       }

       USART_SendData(COM_USART[ch],buf);    //发送缓冲区空，发送下一个字节数据

     }

len = i;

     

return len;

}

ST-FAE-SALE

代码一大堆，看这头疼

chenguangyou

为什么会这样，是不是时钟没配置正确，今天我也遇到这个问题，一直没有怀疑波特率115200的问题，刚刚改成38400，果真可以，为啥呢，好奇？