STM32的usart2串口发送，串口助手收到的数据有错误的位？？？

mahui85

用的固件库3.5，串口为Polling轮询式发送，为啥串口1可以正确接收到字符，串口2有对的有错的。高手帮忙给指点一下啊，啥原因啊？
程序如下： 

int main(void)

{   

  #ifdef DEBUG

    debug();

  #endif

  RCC_Configuration();

   /* Configure HCLK clock as SysTick clock source */

   SysTick_Config(72000); 

   GPIO_Configuration();   

 !  UARTx_Init(USART1, 9600, USART_Mode_Rx | USART_Mode_Tx);

   UARTx_Init(USART2, 9600, USART_Mode_Rx | USART_Mode_Tx); 

   LedShow_Init();

  /* Add your application code here */

      Delay_ms(5000);  

 

  /* Infinite loop */

  while (1)

  {

for (i=0; i<5; i++ )

{

        Uartx_SendChar(USART2, '5');

        GPIO_WriteBit(GPIOF, GPIO_Pin_6, 

     (BitAction)(1-(GPIO_ReadOutputDataBit(GPIOF, GPIO_Pin_6)))); 

     Delay_ms(1000);

     USARTx_SendString(USART1, "\r\nABCDEF\r\n");//

}  

  }

}

void RCC_Configuration(void)

{   

  /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/

  /* RCC system reset(for debug purpose)系统复位 */

  RCC_DeInit();

  /* Enable HSE */

  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */

  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)

  {

    /* Enable Prefetch Buffer */

    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* Flash 2 wait state */

    FLASH_SetLatency(FLASH_Latency_2);

 

    /* HCLK = SYSCLK 系统总线时钟*/

    RCC_HCLKConfig(RCC_SYSCLK_Div1); 

  

    /* PCLK2 = HCLK 高速外围总线时钟*/

    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK/2 低速外围总线时钟*/

    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* PLLCLK = 8MHz * 9 = 72 MHz 配置PLL时钟源和倍频因子*/

    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

    /* Enable PLL */ 

    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready 检查PLL是否就绪*/

    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)

    {

    }

    /* Select PLL as system clock source 选择PLL时钟作为系统时钟源*/

    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */

    while(RCC_GetSYSCLKSource() != 0x08)

    {

    }

  }

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |

                     RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |

                     RCC_APB2Periph_GPIOE | RCC_APB2Periph_GPIOF |

 RCC_APB2Periph_GPIOG | RCC_APB2Periph_AFIO  |

 RCC_APB2Periph_TIM1  | RCC_APB2Periph_USART1, ENABLE);

  /* 打开APB1总线上的USART2时钟 */

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

}

void GPIO_Configuration(void)

{

    GPIO_InitTypeDef    GPIO_InitStructure;     //结构体 初始化

    /* Configure USART1 Tx (PA.09) as alternate function push-pull */

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  //采用的115200波特率，所以10MHz够了，降低功耗

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Configure USART2 Tx (PA.02) as alternate function push-pull */

    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);  

  

   /* Configure USART2 Rx (PA.10) as input floating */

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

   /* Configure USART2 Rx (PA.03) as input floating */

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

   /* Configure LED1, LED2, LED3, LED4(PF.06,07,08,09) as input floating */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;//GPIO_Pin_All; 

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //模拟输入 GPIO_Mode_Out_PP GPIO_Mode_AIN  

GPIO_Init(GPIOF, &GPIO_InitStructure);

}

void  UARTx_Init(USART_TypeDef * USARTx, uint32_t BAUD, uint16_t MODE)

{

USART_InitTypeDef USART_InitStructure;

USART_ClockInitTypeDef  USART_ClockInitStructure;

    /* 将结构体设置为缺省状态Configure the USARTx Default paramters */

    USART_ClockInit(USARTx, &USART_ClockInitStructure); 

    USART_StructInit(&USART_InitStructure); 

/* USARTx mode config */

USART_InitStructure.USART_BaudRate = BAUD;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;

USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位

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

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制

USART_InitStructure.USART_Mode = MODE;

USART_Init(USARTx, &USART_InitStructure);

    /* Configure the USARTx synchronous paramters */

    USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;

    USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;  //High

    USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;

    USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;

    USART_ClockInit(USARTx, &USART_ClockInitStructure);

//USART_ITConfig(USARTx, USART_IT_TXE, ENABLE); //TXE发送中断,TC传输完成中断,RXNE接收中断,PE奇偶错误中断,可以是多个

/* 使能USART外设 */ 

    USART_Cmd(USARTx, ENABLE);

}

void LedShow_Init(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

  /* Configure LED1,LED2,LED3 and LED4 (PF.06, PF.07, PF.08, and PF.09 )as Out Push_Pull */

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

  GPIO_Init(GPIOF, &GPIO_InitStructure);

}

unsigned char Uartx_SendChar(USART_TypeDef* USARTx, unsigned char ch)

{

    USART_ClearFlag(USARTx,USART_FLAG_TC);//USART_GetFlagStatus(USARTx,USART_FLAG_TC); //清除发送完成标志位

    USART_SendData(USARTx,(unsigned char) ch);

    while( USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET ); //等待发送完成。   检测 USART_FLAG_TC 是否置1；

    //USART_ClearFlag(USARTx,USART_FLAG_TC);

    return ch;

}

 

void USARTx_SendString(USART_TypeDef* USARTx, unsigned char * str)

{

  //USART_ClearFlag(USARTx,USART_FLAG_TC); //清除发送完成标志位 TC,即Transmission Complete

  while(*str)

  {

    USART_SendData(USARTx,*str++);

while(USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET);

  }

} 

正点原子

波特率多少？
跟踪一下代码看看吧。
串口2的时钟是串口1的一半了。