spi2双机通信问题

421955124 · 发表于 2017-8-10 12:27:43

主机给从机发数据，从机接收采用中断，主机发数据收到的全是0，但是从机的中断进不了，看了很久不知道是哪儿的原因，下面是代码，望大神支招。

主机配置
——————————————————————————————————————
#include "spi_dma.h"
void SPI2_DMA_Configuration( void )
{
SPI_InitTypeDef  SPI_InitStructure;
   GPIO_InitTypeDef GPIO_InitStructure;

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB ,ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|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);
GPIO_ResetBits(GPIOB,GPIO_Pin_12);

   SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
      SPI_InitStructure.SPI_Mode = SPI_Mode_Master;//SPI_Mode_Master 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_NSS_Hard       SPI_NSS_Soft
      SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
      SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
      SPI_InitStructure.SPI_CRCPolynomial = 7;
      SPI_Init(SPI2, &SPI_InitStructure);
   SPI_Cmd(SPI2, ENABLE);

}

u8 SPI2_ReadWriteByte(u8 TxData)
{
   u8 retry=0;
   while((SPI2->SR&1<<1)==0)
   {
      retry++;
      if(retry>200)return 0;
   }
   SPI2->DR=TxData;
   retry=0;
   while((SPI2->SR&1<<0)==0)
   {
      retry++;
      if(retry>200)return 0;
   }
   return SPI2->DR;
}
int main()
{
      int i =0 ;
   int j =0 ;
   int q =0 ;
   SPI2_DMA_Configuration();
   while(1)
      {
      q = SPI2_ReadWriteByte((u8)(0x34));
         i = SPI2_ReadWriteByte((u8)(0x22));

      }

}
/****************************************/
/****************************************/
从机配置___________________________________________________
#include "spi_dma.h"
#include "string.h"

extern u8 Slave_Temp;
void SPI2_DMA_Configuration( void )
{

   SPI_InitTypeDef  SPI_InitStructure;
   GPIO_InitTypeDef GPIO_InitStructure;
   NVIC_InitTypeDef NVIC_InitStructure;

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,    ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|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_Mode_Master 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_Hard; //SPI_NSS_Hard       SPI_NSS_Soft
      SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
      SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
      SPI_InitStructure.SPI_CRCPolynomial = 7;
      SPI_Init(SPI2, &SPI_InitStructure);

      SPI_I2S_ITConfig(SPI2,SPI_I2S_IT_RXNE,ENABLE);

      NVIC_InitStructure.NVIC_IRQChannel=SPI2_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
      NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
      NVIC_Init(&NVIC_InitStructure);

}
void SPI2_IRQHandler(void)
{
if(SPI_I2S_GetITStatus(SPI2, SPI_I2S_IT_RXNE) == SET)
  {
      Slave_Temp = SPI2_ReadByte(0x00);
   SPI2_ReadWriteByte(0xba);
}
}

u8 SPI2_ReadByte(u8 TxData)
{
   u8 retry=0;
   while((SPI2->SR&1<<0)==0)
   {
      retry++;
      if(retry>200)return 0;
   }
   return SPI2->DR;
}

u8 SPI2_ReadWriteByte(u8 TxData)
{
   u8 retry=0;
   while((SPI2->SR&1<<1)==0)
   {
      retry++;
      if(retry>200)return 0;
   }
   SPI2->DR=TxData;
   retry=0;
   while((SPI2->SR&1<<0)==0)
   {
      retry++;
      if(retry>200)return 0;
   }
   return SPI2->DR;
}

int main()
{
   int i = 0;
   int t = 0;
   int j =0xff;
      SPI2_DMA_Configuration();
   while(1);
}