SPRUJ17H March 2022 – October 2024 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1
The LIN 2.0 protocol uses event-triggered frames that can occasionally cause collisions. Event-triggered frames are handled in software.
If no responder answers to an event triggered frame header, the commander node sets the NRE flag, and a NRE interrupt occurs if enabled. If a collision occurs, a frame error and checksum error can arise before the NRE error. Those errors are flagged and the appropriate interrupts occur, if enabled.
Frame errors and checksum errors depend on the behavior and synchronization of the responding responders. If the responders are totally synchronized and stop transmission once the collision occurred, it is possible that only the NRE error is flagged despite the occurrence of a collision. To detect if there has been a reception of one byte before the NRE error is flagged, the BUS BUSY flag can be used as an indicator.
The BUS BUSY flag is set on the reception of the first bit of the header and remains set until the header reception is complete, and again is set on the reception of the first bit of the response. In the case of a collision, the flag is cleared in the same cycle as the NRE flag is set.
Software can implement the following sequence:
Even in the case of a collision, the received (corrupted) data is accessible in the RX buffers; registers LINRD0 and LINRD1.