stm32——LIN主机通讯开发笔记

1、LIN的基础知识

推荐下面2篇博客

https://blog.csdn.net/zz56z56/article/details/95034165

https://blog.csdn.net/wqx521/article/details/79570881

2、LIN的数据发送

主机数据发送只管下发就行

void LINSendTest(void)
{
    unsigned char check_sum, parity_id, i;
    SendMsg[0].ID=0x17;
    SendMsg[0].length=8;
    SendMsg[0].Data[0] =0xAD ;
    SendMsg[0].Data[1] =0X32 ;
    SendMsg[0].Data[2] =0X09 ;
    SendMsg[0].Data[3] =0X43 ;
    SendMsg[0].Data[4] =0xAD ;
    SendMsg[0].Data[5] =0X32 ;
    SendMsg[0].Data[6] =0X09 ;
    SendMsg[0].Data[7] =0X43 ;
  LINSendBreak();//同步间隔段
  LINSendChar(0x55);//同步段
  
  parity_id = LINCalID(SendMsg[0].ID);//受保护的ID段
  LINSendChar(parity_id);

  for(i = 0; i < SendMsg[0].length; i++)//数据段
  {
    LINSendChar(SendMsg[0].Data[i]);
  }

  check_sum = LINCalChecksum(parity_id,SendMsg[0].Data);//校验段
  // 发送校验和场
  LINSendChar(check_sum);

}

3、LIN的数据接收

首先主机要发送帧头，即发送同步间隔段和同步段

void LINReq(void)
{
    unsigned char parity_id;   
    ReqMsg.ID=0x10;
    LINSendBreak();
    LINSendChar(0x55);
    parity_id=LINCalID(ReqMsg.ID);
    LINSendChar(parity_id);
}

从机响应后主机进入中断处理数据

uint8_t data[100];
void LIN_INT_FUNC(void)
{
  uint8_t ret;
 
  if(USART_GetITStatus(LIN_CHANNEL, USART_IT_RXNE))
  {
    USART_ClearITPendingBit(LIN_CHANNEL, USART_IT_RXNE);
    ret = USART_ReceiveData(LIN_CHANNEL);
    data[iii]=ret;
    iii++;
  }
 
  if(USART_GetITStatus(LIN_CHANNEL, USART_IT_LBD))
  {
    USART_ClearITPendingBit(LIN_CHANNEL, USART_IT_LBD); // 检测到同步间隔场
    //LinStatusSet(SYNCH);
    iii=0;
  }
 
  if(USART_GetFlagStatus(LIN_CHANNEL, USART_FLAG_ORE) == SET) // 溢出
  {
    USART_ClearFlag(LIN_CHANNEL, USART_FLAG_ORE);
    USART_ReceiveData(LIN_CHANNEL);
  }
}