两个STM32f103zet6单片机双机SPI通信失败的问题求救原子哥

根号九LOVE

如题，我用两个单片机进行双机SPI通讯，一个设定为主机，一个为从机，主机mosi接从机miso，主机miso接从机mosi，主从机sck一连，我用的是NSS软件控制，因此，从机ss管脚直接接到GND上，主机那个管脚没用。

这是我主机的spi初始化程序

void SPI2_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  SPI_InitTypeDef  SPI_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );
RCC_APB1PeriphClockCmd( RCC_APB1Periph_SPI2,  ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15); 
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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; 
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7; 
SPI_Init(SPI2, &SPI_InitStructure); 
SPI_Cmd(SPI2, ENABLE);
SPI2_ReadWriteByte(0xff);
 }   
这是我从机的SPI初始化
void SPI2_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  SPI_InitTypeDef  SPI_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );
RCC_APB1PeriphClockCmd( RCC_APB1Periph_SPI2,  ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15); 
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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; 
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7; 
SPI_Init(SPI2, &SPI_InitStructure); 
SPI_Cmd(SPI2, ENABLE);
SPI2_ReadWriteByte(0xff);
 }   

然后主函数里就用的SPI2_ReadWriteByte(0xff);
然后我还用示波器看了下主机的发送时序和发送的数据对不对，完全没有问题，可是从机就是收不到，请问原子哥这是怎么回事呢？

根号九LOVE

自己弄错了，应该是主机MISO接从机MISO，主机MOSI接从机MOSI；自己理解错了！