Abstract: Systems and methods for protocol-tolerant communications in a Controller Area Network (CAN) are described. In some embodiments, a method may include receiving a frame at a network node; identifying, by the network node, a bit in a selected field of the frame; and determining, by the network node, that the frame follows a second format despite the bit indicating that the frame follows a first format. In other embodiments, a CAN controller includes message processing circuitry; and a memory coupled to the message processing circuitry, the memory having program instructions that configure the message processing circuit to: receive a frame; identify a bit in a selected field of the frame; and determine that the frame follows a Classical CAN format despite the bit indicating that the frame follows a flexible data-rate CAN (CAN FD) format.

Abstract: An integrated circuit includes Controller Area Network (CAN) circuitry, and identifier (ID) filter circuitry coupled to the CAN circuitry and a CAN bus. The ID filter circuitry is configured to determine if a CAN message selected for transmission by the CAN circuitry should be blocked based on an ID of the selected CAN message. In response to determining that the selected message should not be blocked, the CAN circuitry broadcasts the selected message to all CAN nodes coupled to the CAN bus. In response to determining that the selected message should be blocked, the selected message is not transmitted to the CAN bus.

Abstract: Systems and methods for protocol-tolerant communications in a Controller Area Network (CAN) are described. In some embodiments, a method may include receiving a frame at a network node; identifying, by the network node, a bit in a selected field of the frame; and determining, by the network node, that the frame follows a second format despite the bit indicating that the frame follows a first format. In other embodiments, a CAN controller includes message processing circuitry; and a memory coupled to the message processing circuitry, the memory having program instructions that configure the message processing circuit to: receive a frame; identify a bit in a selected field of the frame; and determine that the frame follows a Classical CAN format despite the bit indicating that the frame follows a flexible data-rate CAN (CAN FD) format.

Abstract: Systems and methods for indicating internal transmitter errors in a Controller Area Network (CAN). In some embodiments, a method may include initiating, by a device coupled to a CAN, transmission of a message via the CAN; detecting an error by the device during the transmission; and continuing, by the device after having detected the error, the transmission of the message without causing or indicating a bus error condition. In other embodiments, a CAN node may include message processing circuitry configured to receive a frame from a transmitter, the frame comprising a cyclic redundancy check (CRC) field, the message processing circuitry further configured to identify an internal error of the transmitter based upon the CRC field.

Abstract: Systems and methods for indicating internal transmitter errors in a Controller Area Network (CAN). In some embodiments, a method may include initiating, by a device coupled to a CAN, transmission of a message via the CAN; detecting an error by the device during the transmission; and continuing, by the device after having detected the error, the transmission of the message without causing or indicating a bus error condition. In other embodiments, a CAN node may include message processing circuitry configured to receive a frame from a transmitter, the frame comprising a cyclic redundancy check (CRC) field, the message processing circuitry further configured to identify an internal error of the transmitter based upon the CRC field.

Abstract: Systems and methods for handling wake-up messages in a Controller Area Network (CAN) are described. In some embodiments, a method may include operating a CAN controller in a selected one of a plurality of operating modes in response to the detection of an event or activity on a CAN bus. The method may also include handling, by the CAN controller, a CAN message using a message handling protocol associated with the selected one of the plurality of operating modes, for example, while a host processor operates in a low power mode. In various implementations, each of the plurality of operating modes may correspond to a different amount of power consumption by the CAN controller. The method may further include transmitting a selected one of a plurality of response messages by the CAN controller over the CAN bus, in some cases, without waking up the processor from the low power mode.

Abstract: Systems and methods for handling wake-up messages in a Controller Area Network (CAN) are described. In some embodiments, a method may include operating a CAN controller in a selected one of a plurality of operating modes in response to the detection of an event or activity on a CAN bus. The method may also include handling, by the CAN controller, a CAN message using a message handling protocol associated with the selected one of the plurality of operating modes, for example, while a host processor operates in a low power mode. In various implementations, each of the plurality of operating modes may correspond to a different amount of power consumption by the CAN controller. The method may further include transmitting a selected one of a plurality of response messages by the CAN controller over the CAN bus, in some cases, without waking up the processor from the low power mode.