STM32F072 UART2 无数据收发出来

只看该作者 · 2015-2-3 20:38

程序UART1可以，不知道，为什么UART2就是不行，发送能进入发送中断，PA2和PA3就是没有数据出来
#define WR_UART_viIsr    USART2_IRQHandler
#define WR_USART    USART2

void WR_UART_vInit(void)
{
// GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

/*
*  USART2_TX -> PA2 , USART2_RX -> PA3
*/
/* Enable GPIOA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2  ,ENABLE);

/*

GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_1);

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);

*/

  /* GPIO configuration for USART2 signals */
  /* (1) Select AF mode (10) on PA2 and PA3 */
  /* (2) AF1 for USART2 signals */
  GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER2|GPIO_MODER_MODER3))\
               | (GPIO_MODER_MODER2_1 | GPIO_MODER_MODER3_1); /* (1) */
  GPIOA->AFR[1] = (GPIOA->AFR[1] &~ (GPIO_AFRL_AFRL2 | GPIO_AFRL_AFRL3))\
               | (1 << (2 * 4)) | (1 << (3 * 4)); /* (2) */

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(WR_USART, &USART_InitStructure);
USART_ClearFlag(WR_USART,USART_FLAG_TC);
USART_ITConfig(WR_USART, USART_IT_RXNE, ENABLE);
    USART_ITConfig(WR_USART, USART_IT_TXE, DISABLE);

WR_NVIC_Configuration();
USART_Cmd(WR_USART, ENABLE);
}

void WR_UART_viIsr(void) //interrupt 4 using 2 /* use registerbank 2 for interrupt */
{
if((WR_USART->ISR & USART_FLAG_RXNE) != (uint16_t)RESET)
{
WR_USART->ISR = (UInt16)~USART_FLAG_RXNE;
if(WR_RxIsFull())
{
RxSetOverFlow();
}
else
{
WR_Rx_Buf[WR_RxTail] = (UInt8)(WR_USART->RDR & (uint16_t)0x01FF);
WR_RxTail = RxNextPosit(WR_RxTail);
}
}
if((WR_USART->ISR & USART_FLAG_TXE) != (UInt16)RESET)
{
      WR_USART->ISR = (UInt16)~USART_FLAG_TXE;
      if(WR_TxHasData())
      {
         WR_USART->TDR = (WR_Tx_Buf[WR_TxHead] & (UInt16)0x01FF);
         WR_TxHead = TxNextPosit(WR_TxHead);
         TxResetIdle();
      }
      else
      {
         TxSetIdle();
         USART_ITConfig(WR_USART, USART_IT_TXE, DISABLE);
      }

}

//Òç³ö´¦Àí
if(USART_GetFlagStatus(WR_USART,USART_FLAG_ORE) != (UInt16)RESET)
{
USART_ClearFlag(WR_USART,USART_FLAG_ORE);
USART_ReceiveData(WR_USART);
}

}

UInt8 WR_send( UInt8 *ptr, UInt8 size )
{
   //WR_UART_EnTx();
USART_ClearFlag(WR_USART,USART_FLAG_TC);

// if size is 0, means ptr is a null terminated string, caller wants me to find size by myself
if ( size == 0 )
{
while ( *(ptr++) ) size++;
ptr -= (size+1); // go back to original start position
}
if ( size == 0 )
{
return 0;
}

for( ;size--; )
{
      WR_Tx_Buf[ WR_TxTail ] = *(ptr++);
      WR_TxTail = TxNextPosit( WR_TxTail );
}
   USART_ITConfig(WR_USART, USART_IT_TXE, ENABLE);

return 1;
}

WR_send( DataField, len );

总是有发送数据进入UART2中断，就是PA2没有数据出来