串口2能发送数据不能接收数据

只看该作者 · 2014-2-21 22:51

最近做个项目需要用到两个串口，在调试过程中遇到问题，望广大好心的高手帮助

奇怪的现象：用到串口1时可以发送数据和接收数据（程序已用串口1验证过），修改为串口2后就只能发送数据不能接收数据！

代码：
int main(void)
｛
vu16 i=500;
// gpio_initi();
NVIC_Configuration();
USART_Config();
/* start_gsm();
Delay(20000000);
USART_printf(USART2,"AT\r\n");
Delay(2000000);
USART_printf(USART2,"AT+CGPSPWR=1\r\n");
Delay(200000);
USART_printf(USART2,"AT+CGPSRST=1\r\n");
Delay(200000);
USART_printf(USART2,"AT+CGPSIPR=9600\r\n");*/
      while(1)
      {
      i=500;
      if(USART_GetFlagStatus(USART2, USART_IT_RXNE) != RESET)
      {
                  USART_SendData(USART2,USART_ReceiveData(USART2));
            while(i--);
      }
      }
｝

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);//设置优先级分组形式1，即抢占级占一位，优先级占3位

/****************UART2全局中断使能***********************/
NVIC_InitStructure.NVIC_IRQChannel=USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);

}

void USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
// NVIC_Configuration();

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9|GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);

USART_InitStructure.USART_BaudRate=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;
   /* Configure the USART1 */
    USART_Init(USART1, &USART_InitStructure);
  /* INIT  USART1 */
   USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
  /* Enable the USART1 */
   USART_Cmd(USART1, ENABLE);

USART_InitStructure.USART_BaudRate=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;
   /* Configure the USART2 */
    USART_Init(USART2, &USART_InitStructure);
  /* INIT  USART2 */
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
  /* Enable the USART2 */
USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
    USART_ClearFlag(USART2,USART_FLAG_TC);
   USART_Cmd(USART2, ENABLE);
}

3万 · 2014-2-22 08:59

这是我用407写的2个串口初始化程序，可以参考下
void NVIC_Config(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  /* Enable the USARTx Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

//初始化串口1
void COM1Init(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
      GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
      GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
      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_Speed = GPIO_Speed_100MHz;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      USART_InitStructure.USART_BaudRate = BaudRate;//波特率设置
      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(USART1, &USART_InitStructure);
      USART_Init(USART2, &USART_InitStructure);

      USART_Cmd(USART1, ENABLE);
      USART_Cmd(USART2, ENABLE);

      USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
      USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
      NVIC_Config();
}

1万 · 2014-2-22 16:37

没有看出什么问题, 是不是先检查一下硬件问题, 比如焊接问题

串口2能发送数据不能接收数据

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