Controller Area Network (CAN)
CAN_STATUS_EWARN - an error counter has reached a limit of at least 96
CAN_STATUS_EPASS - CAN controller is in the error passive state
CAN_STATUS_RXOK - a message was received successfully (independent of any mes-
sage filtering).
CAN_STATUS_TXOK - a message was successfully transmitted
CAN_STATUS_LEC_MSK - mask of last error code bits (3 bits)
CAN_STATUS_LEC_NONE - no error
CAN_STATUS_LEC_STUFF - stuffing error detected
CAN_STATUS_LEC_FORM - a format error occurred in the fixed format part of a message
CAN_STATUS_LEC_ACK - a transmitted message was not acknowledged
CAN_STATUS_LEC_BIT1 - dominant level detected when trying to send in recessive
mode
CAN_STATUS_LEC_BIT0 - recessive level detected when trying to send in dominant
mode
CAN_STATUS_LEC_CRC - CRC error in received message
The remaining status registers are 32-bit bit maps to the message objects. They can be used
to quickly obtain information about the status of all the message objects without needing to
query each one. They contain the following information:
CAN_STS_TXREQUEST - if a message object’s TxRequest bit is set, that means that a
transmission is pending on that object. The application can use this to determine which
objects are still waiting to send a message.
CAN_STS_NEWDAT - if a message object’s NewDat bit is set, that means that a new
message has been received in that object, and has not yet been picked up by the host
application
CAN_STS_MSGVAL - if a message object’s MsgVal bit is set, that means it has a valid
configuration programmed. The host application can use this to determine which message
objects are empty/unused.
Returns:
Returns the value of the status register.
April 8, 2013 67
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