STM32F103VCT6的SPI1数据发送和接收问题

LeoZhou34 提问时间：2015-3-24 12:59 /

各位大侠，我刚开始接触STM32F103VCT6，关于SPI1的数据发送的一些疑问，请帮忙！写了一个测试程序（SPI Master Mode）,每秒定时发送数据，SPI部分的程序如下：

/* SPI1初始化*/
   GPIO_InitTypeDef  GPIO_InitStruct;
   SPI_InitTypeDef SPI_InitStruct;
   NVIC_InitTypeDef  NVIC_InitStruct;

      /* Enable GPIOA and SPI1 clock */
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

      /* Enable the SPI1 Pins Software Remapping */
      GPIO_PinRemapConfig(GPIO_Remap_SPI1, DISABLE);

      /* Connect PXx to SPI1_NSS(PA.4) */
      GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4;
      GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
      GPIO_Init(GPIOA, &GPIO_InitStruct);
      GPIO_SetBits(GPIOA, GPIO_Pin_4);

      /* Connect PXx to SPI1_SCK(PA.5) and SPI1_MOSI(PA.7) */
      GPIO_InitStruct.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_5;
      GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_AF_PP;
      GPIO_Init(GPIOA, &GPIO_InitStruct);

      /* Connect PXx to SPI1_MISO(PA.6) */
      GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6;
      GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_IN_FLOATING;
      GPIO_Init(GPIOA, &GPIO_InitStruct);

      /* SPI1 configuration -------------------------------------*/
      SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
      SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
      SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
      SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
      SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
      SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;
      SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
      SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
      SPI_InitStruct.SPI_CRCPolynomial = 7;
      SPI_Init(SPI1, &SPI_InitStruct);
      SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_RXNE, ENABLE);
      SPI_Cmd(SPI1, ENABLE);

      /* NVIC configuration */
      /* Configure the Priority Group to 2 bits */
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

      /* Enable the SPI1 Interrupt */
      NVIC_InitStruct.NVIC_IRQChannel = SPI1_IRQn;
      NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStruct);

主程序中每1s进行SPI1数据发送。

   if(net_spi1_flag == 1)
      {
         net_spi1_flag = 0;
         GPIO_ResetBits(GPIOA, GPIO_Pin_4);

         for(test_num=0; test_num<255; test_num++)
         {
            for(test_len=0; test_len<255; test_len++)
            {
                  SPI_I2S_SendData(SPI1, net_spi1_data[test_len]);
                  while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
            }
         }

         GPIO_SetBits(GPIOA, GPIO_Pin_4);
      }

问题：在程序中只开启了SPI1得接收中断，而没有开启发送中断，每次SPI1发送数据时，都会进入到SPI1中断服务程序中。SPI1的中断服务程序如下：
void SPI1_IRQHandler(void)
{
static uint8_t spi_num=0;

if(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) != RESET)
{
   spi_num++;
}
}

请不吝赐教！