Discuz! Board

标题: SPI通讯求指导啊 [打印本页]

作者: windit 时间: 2014-4-18 13:49
标题: SPI通讯求指导啊
void SPI_init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);//使能SP1I和GPIOA时钟
   GPIO_PinAFConfig(GPIOA,GPIO_PinSource5|GPIO_PinSource6|GPIO_PinSource7,GPIO_AF_SPI1);
   GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;//MOSI SCK复用
   GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;//复用推挽输出
   GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
   GPIO_Init(GPIOA,&GPIO_InitStructure);
   GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2;//SPI_CS
   GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;//推挽输出
   GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
   GPIO_Init(GPIOA,&GPIO_InitStructure);
      SPI_Cmd(SPI1, DISABLE);
      SPI_InitStructure.SPI_Direction= SPI_Direction_2Lines_FullDuplex;
      SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
      SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
      SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
      SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
      SPI_InitStructure.SPI_NSS = SPI_NSS_Soft ;
      SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
      SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
      SPI_InitStructure.SPI_CRCPolynomial = 7;
      SPI_Init(SPI2, &SPI_InitStructure);
      SPI_Cmd(SPI1, ENABLE);

}

   while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)==RESET);
   SPI_I2S_SendData(SPI1,data);
   printf("数据发送完毕!!!\r\n");

   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); //检查指定的SPI标志位设置与否:接受缓存非空标志位
   re_data = SPI_I2S_ReceiveData(SPI1); //返回通过SPI1最近接收的数据
   printf ("接收数据成功 %x\r\n",re_data);

运行之后，死在判断发送标志位是否为RESET那，请问是什么原因呀？

作者: admin 时间: 2014-4-19 21:29
其他地方设置错误了吧

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