Time Slave Behavior
In the gPTP network, the node that acts as a Time Slave has the following message processing flow:
If EthTSynHardwareTimestampSupport is set to TRUE, the TimeSlave node can obtain the timestamp of the SYNC message received through the function EthTSyn_RxIndication;
TimeSlave can configure the parameter EthTSynGlobalTimeFollowUpTimeout to implement timeout monitoring of Follow_Up messages after receiving SYNC messages. Once a timeout occurs, the current time synchronization will fail and the system will wait for the next new time synchronization sequence.
If EthTSynHardwareTimestampSupport is set to TRUE, after the TimeSlave node receives a valid Follow_Up message, if the difference between the local time and the global time sent by Follow_Up exceeds EthTSynTimeHardwareCorrectionThreshold, then the function EthIf_SetCorrectionTime needs to be called to reset the local time.
If EthTSynHardwareTimestampSupport is set to FALSE, the Time Slave needs to calculate the global time and then use the function StbM_BusSetGlobalTime to achieve time synchronization;
In order to help you better use the EthTsync module, Xiao T has compiled the commonly used function interfaces and functional descriptions of the vehicle-mounted Ethernet time synchronization module, as shown in Figure 18 below:
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