STM32F042F6P 串口2问题

zzfd97 提问时间：2018-2-20 17:28 /

最近用STM32F042F6P用于双串口通信，串口1通信正常，串口2一直调试不成功，不知道是什么问题，故求助大神们；串口2的配置信息如下：
void RCC_Configuration(void)
{
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);//设置A端口时钟使能

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);//设置B端口时钟使能
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOF, ENABLE);//设置F端口时钟使能

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //设置串口1时钟使能

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);//设置串口2时钟使能

}

void USART2_Configuration(void)
  {
   GPIO_InitTypeDef GPIO_InitStructure;
   USART_InitTypeDef USART_InitStructure;
   NVIC_InitTypeDef NVIC_InitStructure;

//gpio配置
/* Connect PXx to USARTx_Tx */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_1);//PA2复用功能打开
/* Connect PXx to USARTx_Rx */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_1); //PA3复用功能打开

/* Configure USART2 Tx (PA.02) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = USART2_TX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType  = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed  = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART2 Rx (PA.3) as input mode */
GPIO_InitStructure.GPIO_Pin = USART2_RX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* USART2 mode config */
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;
USART_Init(USART2, &USART_InitStructure);

   //打开空闲中断
   //USART_ITConfig(USART2,USART_IT_IDLE, ENABLE);
   //打开接收中断
   USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
   USART_Cmd(USART2, ENABLE);
       USART_ClearFlag(USART2, USART_FLAG_TC);


//允许UART2中断
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}

void Uart2PutChar(unsigned char ch)
{
USART_SendData(USART2,ch);
while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET);
}

void Send2_Mesg(void)
{
Uart2PutChar('F');
Uart2PutChar('I');
Uart2PutChar('S');
Uart2PutChar('R');
Uart2PutChar('T');
Uart2PutChar('0');
Uart2PutChar('2');
Uart2PutChar('\n');
}