ICP DAS USA I-7565M-FD, Информация о сервисе и использовании

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I-7565M-FD USB to CAN/CAN FD converter User Manual (version 1.0.0) Page: 82
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7.3. CAN Status Register
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 AckError : The message transmitted by the M_CAN 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 Bit0Error : 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 CRCError : 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 Busoff status
0 The CAN module is not in busoff state.
1 The CAN controller is in busoff state.
31:8 - - Reserved