串口2与串口1相同的配置，但是串口1能一次正确发送一整串的字符，但是串口2每次都发送00，这是为什么

支持者2400

[mw_shl_code=applescript,true]void uart_init(u32 bound){
  //GPIO¶Ë¿úéèÖÃ
  GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
         
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);        //ê1ÄüUSART1￡¬GPIOAê±Öó

        //USART1_TX   GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;        //¸′óÃíÆíìêä3ö
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.9
   
  //USART1_RX          GPIOA.103õê¼»ˉ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿Õêäèë
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.10  

  //Usart1 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇàÕ¼óÅÏ輶3
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;                //×óóÅÏ輶3
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                        //IRQí¨μàê1Äü
        NVIC_Init(&NVIC_InitStructure);        //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷
  
   //USART 3õê¼»ˉéèÖÃ

        USART_InitStructure.USART_BaudRate = bound;//′®¿ú2¨ìØÂê
        USART_InitStructure.USART_WordLength = USART_WordLength_9b;//×Ö3¤Îa8λêy¾Y¸ñê½
        USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1λ
        USART_InitStructure.USART_Parity = USART_Parity_Even;//ÎTÆæżD￡Ñéλ
        USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
        USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;        //êÕ·￠Ä￡ê½
  USART_Init(USART1, &USART_InitStructure); //3õê¼»ˉ′®¿ú1
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï
        //USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï
  USART_Cmd(USART1, ENABLE);                    //ê1Äü′®¿ú1



}

void uart_inita(u32 bound)
{
  GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
       
         RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_GPIOA, ENABLE);        //ê1ÄüUSART1￡¬GPIOAê±Öó
       
        //USART2TX   GPIOA.2
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;        //¸′óÃíÆíìêä3ö
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.9
   
  //USART2_RX          GPIOA.33õê¼»ˉ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿Õêäèë
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.10  

  //Usart1 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇàÕ¼óÅÏ輶3
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;                //×óóÅÏ輶3
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                        //IRQí¨μàê1Äü
        NVIC_Init(&NVIC_InitStructure);        //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷
  
   //USART 3õê¼»ˉéèÖÃ

        USART_InitStructure.USART_BaudRate = bound;//′®¿ú2¨ìØÂê
        USART_InitStructure.USART_WordLength = USART_WordLength_9b;//×Ö3¤Îa8λêy¾Y¸ñê½
        USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1λ
        USART_InitStructure.USART_Parity = USART_Parity_Even;//ÎTÆæżD￡Ñéλ
        USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
        USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;        //êÕ·￠Ä￡ê½


  USART_Init(USART2, &USART_InitStructure); //3õê¼»ˉ′®¿ú1
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï
        //USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï
  USART_Cmd(USART2, ENABLE);                    //ê1Äü′®¿ú1

}
[/mw_shl_code]

qiuzhicheng

RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_GPIOA, ENABLE);
看看哪里错了

支持者2400

void UartA2SendStr (u8 *pucStr, u8 ulNum)
{
  u8 x;
  for(x = 0;x<ulNum;x++)
  {
    while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET);
       USART_SendData(USART2,*pucStr++);
}  
}

int main(void)
{       
         
       
       
   
       
   delay_init();
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
   uart_init(9600);
         uart_inita(9600);
   LED_Init();
   KEY_Init();

         
while(1)       
{  
       
      LED0=0;
  //process();
                        UartA2SendStr(buf1,22);//·￠&#203;í22&#184;&#246;×&#214;&#189;ú                                                                           
                  
         
}
  }

支持者2400

qiuzhicheng 发表于 2018-8-13 15:23
RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_GPIOA, ENABLE);
看看哪里错了

谢谢，已经找到原因了