Autosar代码中Can如何唤醒MCU通讯的

写在前面：
入行一段时间了，基于个人理解整理一些东西，如有错误，欢迎各位大佬评论区指正！！！

1.WakeUp

1.1wakeup source和Check-Wakeup Validation

当Validation Timeout没有被配置为0的时候，通过调用EcuM_ValidateWakeupEvent()进行验证。如果在此期间未验证唤醒事件，EcuM将此事件设置为“过期”，并向BswM报告。该配置主要为了避免误唤醒，例如外部IO或者CAN总线上的电压脉冲唤醒。

以下五种标准的唤醒源不需要校验。

唤醒源分为四种状态：

1.2Can唤醒流程

以TJA1043为例，ECU系统休眠后TJA1043的INH脚处于floating高阻态，外部电路为下拉到低电平。在配置中将TJA1043的INH引脚配置为唤醒源，在休眠中如果收到任意报文该引脚会被拉高，产生一个CAN硬件唤醒事件。如果系统为KL15系统，INH引脚会关联到SBC，INH被触发拉高后ECU会被启动。如果系统为常电系统，INH关联到ECU中断唤醒引脚，通过检测INH唤醒事件激活MCU。

1.2.1EcuM

1.2.2CanIF

1.2.3流程图

2.代码逻辑

1.中断触发EcuM_CheckWakeup(EcuM_WakeupSourceType)

FUNC(void, ECUM_CODE) EcuM_CheckWakeup(EcuM_WakeupSourceType wakeupSource) /* COV_ECUM_CALLOUT */
{

  EcuM_StartCheckWakeup(wakeupSource);

  EcuM_SetWakeupEvent(wakeupSource);
  return;

} /* End of EcuM_CheckWakeup() */

2.调用EcuM_SetWakeupEvent(EcuM_WakeupSourceType)设置唤醒事件

3.EcuM_StartWakeupSources(EcuM_WakeupSourceType)

FUNC(void, ECUM_CODE) EcuM_StartWakeupSources(EcuM_WakeupSourceType wakeupSource) /* PRQA S 3206 */ /* MD_EcuM_3206 */
{
  /* Add implementation of EcuM_StartWakeupSources() */
  if ((wakeupSource & ECUM_WKSOURCE_CN_ADCANFD_e4bb3036) != 0)
  {
    (void)CanSM_StartWakeupSources(ComMConf_ComMChannel_CN_ADCANFD_e4bb3036);
  }
  if ((wakeupSource & ECUM_WKSOURCE_CN_ChassisCAN1_fd490d2b) != 0)
  {
    (void)CanSM_StartWakeupSources(ComMConf_ComMChannel_CN_ChassisCAN1_fd490d2b);
  }
  if ((wakeupSource & ECUM_WKSOURCE_CN_FLRCANFD_83cba2e1) != 0)
  {
    (void)CanSM_StartWakeupSources(ComMConf_ComMChannel_CN_FLRCANFD_83cba2e1);
  }
  return;

} 

4.CanSM_StartWakeupSources(EcuM_WakeupSourceType)设置CanTrancv和driver到NORMAL/START模式用于接收CAN报文。

5.EcuM_CheckValidation(EcuM_WakeupSourceType)

FUNC(void, ECUM_CODE) EcuM_CheckValidation(EcuM_WakeupSourceType wakeupSource)
{

  if ((wakeupSource & ECUM_WKSOURCE_CN_ADCANFD_e4bb3036) != 0)
  {
    CanIf_CheckValidation(ECUM_WKSOURCE_CN_ADCANFD_e4bb3036);
  }
  if ((wakeupSource & ECUM_WKSOURCE_CN_ChassisCAN1_fd490d2b) != 0)
  {
    CanIf_CheckValidation(ECUM_WKSOURCE_CN_ChassisCAN1_fd490d2b);
  }
  if ((wakeupSource & ECUM_WKSOURCE_CN_FLRCANFD_83cba2e1) != 0)
  {
    CanIf_CheckValidation(ECUM_WKSOURCE_CN_FLRCANFD_83cba2e1);
  }
  if ((wakeupSource & ECUM_WKSOURCE_BackboneFR_ADCU_008eca5e) != 0)
  {
    FrIf_CheckWakeupByTransceiver(FrIfConf_FrIfCluster_BackboneFR_688eb60b,FR_CHANNEL_A);
  }
  return;
} 

6.CanIf_CheckValidation(EcuM_WakupSourceType)校验唤醒源

7.校验成功则调用ComM_WakeUpIndication()请求通信，ComMCommunicationAlllowed后就会调转到Full Com状态开启网络.

8.校验失败则调用EcuM_StopWakeupSources()—-CanSM_StopWakeupSources()

FUNC(void, ECUM_CODE) EcuM_StopWakeupSources(EcuM_WakeupSourceType wakeupSource) /* PRQA S 3206 */ /* MD_EcuM_3206 */
{

   if ((wakeupSource & ECUM_WKSOURCE_CN_ADCANFD_e4bb3036) != 0)
  {
    (void)CanSM_StopWakeupSources(ComMConf_ComMChannel_CN_ADCANFD_e4bb3036,wakeupSource);
  }
  if ((wakeupSource & ECUM_WKSOURCE_CN_ChassisCAN1_fd490d2b) != 0)
  {
    (void)CanSM_StopWakeupSources(ComMConf_ComMChannel_CN_ChassisCAN1_fd490d2b,wakeupSource);
  }
  if ((wakeupSource & ECUM_WKSOURCE_CN_FLRCANFD_83cba2e1) != 0)
  {
    (void)CanSM_StopWakeupSources(ComMConf_ComMChannel_CN_FLRCANFD_83cba2e1,wakeupSource);
  }

  return;

} 

作者：说不得明天