ICP DAS USA ECAN-200-FD, User Manual

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ECAN-200-FD (Ethernet to 2-port CAN FD Converter) User Manual Version 1.0.0 Page
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Appendix D. CAN Status Information
Bit Symbol Value Description
2:0 LEC Last error code
These bits indicate the type of the last error to occur on the CAN bus.
This bit field will be cleared when a message has been transferred
without error. The bits in this bit field will be set upon a read access.
0x0 No error.
0x1 Stuff error: More than 5 equal bits in a sequence have occurred in a
part of a received message where this is not allowed.
0x2 Form error: A fixed format part of a received frame has the wrong
format.
0x3 Ack error: The message transmitted by the CAN controller was not
acknowledged by another node.
0x4 Bit1Error: During the transmission of a message (with the exception of
the arbitration field), the device wanted to send a recessive level (bit of
logical value 1), but the monitored bus value was dominant.
0x5 Bit0 Error: During the transmission of a message (or acknowledge bit,
or active error flag, or overload flag), the device wanted to send a
dominant level (data or identifier bit logical value 0), but the monitored
bus value was recessive. During Bus Off recovery this status is set
each time a sequence of 11 recessive bits has been monitored. This
enables the CPU to monitor the proceeding of the Bus Off recovery
sequence (indicating the bus is not stuck at dominant or continuously
disturbed).
0x6 CRC error: The CRC check sum of a received message was incorrect.
The CRC of an incoming message does not match with the CRC
calculated from the received data.
0x7 Unused: No CAN Bus event was detected
4:3 ACT Activity. This register monitors the CAN communication state.
0x0 Synchronizing – node is synchronizing on CAN communication.
0x1 Idle – node is neither receiver nor transmitter.
0x2 Receiver – node is operating as receiver
0x3 Transmitter – node is operating as transmitter.
5 EP Error passive
0 The CAN controller is in the error active state.
1 The CAN controller is in the error passive state as defined in the CAN
2.0 specification.
6 EW Warning status
0 Both error counters are below the Error Warning limit of 96
1 At least one of error counter has reached the Error Warning limit of 96
7 BOFF Bus off status
0 The CAN module is not in Bus off state.
1 The CAN controller is in Bus off state.
31:8 - - Reserved