SPI相互通信的问题

yangzhen86

我用SPI1做主机，SP2做从机时，可以实现1到2的发送
但是反过来，SPI2做主机，SPI1做从机时，SPI1无法收到数据，连中断都不进，这是为什么
以下是，SPI2做主，SPI1做从时的程序
void SPI_init2(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//??GPIOA??
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);//??spi1 
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);//??GPIOB??
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);//??spi2

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;//sck mosi
    GPIO_Init(GPIOA,&GPIO_InitStructure);
    
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;//miso
    GPIO_Init(GPIOA,&GPIO_InitStructure);
    
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;//cs
    GPIO_Init(GPIOA,&GPIO_InitStructure);
    
//spi??
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //????
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_15;//sck mosi
    GPIO_Init(GPIOB,&GPIO_InitStructure);
    
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;//miso
    GPIO_Init(GPIOB,&GPIO_InitStructure);
    
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;//cs
    GPIO_Init(GPIOB,&GPIO_InitStructure);

SPI_Cmd(SPI1, DISABLE);
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
  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_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI1, &SPI_InitStructure);
   /*Enable SPI1.NSS as a GPIO*/
  //SPI_SSOutputCmd(SPI1, ENABLE);
  SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_RXNE, ENABLE);
SPI_Cmd(SPI1, ENABLE);
  //spi1_cs_low;

SPI_Cmd(SPI2, DISABLE);
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;      

 //??????????spi?cr1????ssi??????nss??,?????????

 //http://wenku.baidu.com/view/121e31ef102de2bd9605882b.html

  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;//SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI2, &SPI_InitStructure);
   /*Enable SPI1.NSS as a GPIO*/
  //SPI_SSOutputCmd(SPI2, ENABLE);//???????spi?cr2???ssoe??1,????????
  
SPI_Cmd(SPI2, ENABLE);
  //spi1_cs_low;
NVIC_InitStructure.NVIC_IRQChannel = SPI2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;       
    NVIC_Init(&NVIC_InitStructure);
    //------------------------------------
    NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_Init(&NVIC_InitStructure);

}

Rocks

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   <----用AF就好了
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;//sck mosi
    GPIO_Init(GPIOA,&GPIO_InitStructure);

正点原子

帮顶。。。。。