STM32间SPI通讯收到乱码

STM32间SPI通信收到乱码
发送主机函数
int main(void)
{  
   int i=0;
   unsigned char SPI_TxBuffer[]="MR.ROCK"; 
   USART1_Configuration();
   SPI_Configuration();
   while(SPI_TxBuffer[i]!='\0')
   {
      SPI_SendByte(SPI_TxBuffer[i++]);
   }
   while(1);
}
SPI相关初始化
//SPI的GPIO和SPI初始化
void SPI_Configuration(void)
{
   //定义GPIO,SPI结构体
   GPIO_InitTypeDef GPIO_InitStructure;
   SPI_InitTypeDef  SPI_InitStructure;
   //开PA口复用时钟,初始化系统时钟
   SystemInit();
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO|RCC_APB2Periph_SPI1,ENABLE);
   //配置PA5,PA6,PA7即SPI1__SCK,SPI1_miso,SPI1_mosi
   GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
   GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
   GPIO_Init(GPIOA,&GPIO_InitStructure);
   //配置PC4即SPI1_NSS
   GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4;
   GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
   GPIO_Init(GPIOC,&GPIO_InitStructure);
   //PC4片选信号
   GPIO_ResetBits(GPIOC,GPIO_Pin_4);
   //配置SPI1
   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(SPI1,&SPI_InitStructure);
   SPI_Cmd(SPI1,ENABLE);
//   printf("SPI初始化成功！\r\n"); 
}

//送字函数
u8 SPI_SendByte(u16 byte)
{
   while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)!=SET);
   SPI_I2S_SendData(SPI1,byte);
   while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE)==RESET);
   return SPI_I2S_ReceiveData(SPI1);
} 

从机用中断接收
//SPI的GPIO和SPI初始化
void SPI_Configuration(void)
{
   //定义GPIO,SPI结构体
   GPIO_InitTypeDef GPIO_InitStructure;

   SPI_InitTypeDef  SPI_InitStructure;
   NVIC_InitTypeDefNVIC_InitStructure;
   //开PA口复用时钟,初始化系统时钟
   SystemInit();
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO|RCC_APB2Periph_SPI1,ENABLE);
   //配置PA5,PA6,PA7即SPI1__SCK,SPI1_miso,SPI1_mosi
   GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
   GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
   GPIO_Init(GPIOA,&GPIO_InitStructure);
   //配置PC4即SPI1_NSS
   GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4;
   GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
   GPIO_Init(GPIOC,&GPIO_InitStructure);
   //PC4片选信号
   GPIO_ResetBits(GPIOC,GPIO_Pin_4);
      //进行SPI1的中断配置
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
   NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //优先级为第0级
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);
   //配置SPI1
   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(SPI1,&SPI_InitStructure);
   SPI_I2S_ITConfig(SPI1,SPI_I2S_IT_RXNE,ENABLE);
   SPI_Cmd(SPI1,ENABLE);
   printf("SPI初始化成功！\r\n"); 
}

//送字函数
u8 SPI_SendByte(u16 byte)
{
   while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)!=SET);
   SPI_I2S_SendData(SPI1,byte);
   while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE)==RESET);
   return SPI_I2S_ReceiveData(SPI1);
}
中断处理函数
void SPI1_IRQHandler(void)
{
   int i=0;
   flag=0;
   if(SPI_I2S_GetITStatus(SPI1,SPI_I2S_IT_RXNE)==SET)
   {
     while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE)==SET)

  {
   SPI_RxBuffer[i++]=SPI_SendByte(0xffff);
  }
  SPI_I2S_ClearITPendingBit(SPI1,SPI_I2S_IT_RXNE);
   } 
}
主函数
int main(void)
{   
   USART1_Configuration();
   SPI_Configuration();
   while(1)
   {  
     while(SPI_RxBuffer[flag]!='\0')
     printf("%c",SPI_RxBuffer[flag++]);
   }
} STM32 乱码 SPI
[解决办法]
主从模式是否设置对，ＳＰＩ配置是否正确，延时时间是否合适，检查这些问题。
[解决办法]
SPI模式是否配对了，时钟先不要调太高