Novel CAN FD controller

Abstract

The invention discloses a novel CAN FD controller. A CAN FD total state machine regulates an overall function and working state of a CAN FD controller; a sending management device sends all types of frames and ACK signals; a receiving management device monitors a bus and analyzes data received by the bus; a clock synchronizer control a bit clock cycle according to user setting and a bus signal and provides a bus value sampling point and a sampling value; an error management module carries out statistic counting on node errors and reflects counting values into node error state (ES) and bus state (BS) information; a register group manages registers in a centralized mode; and an interface management device parses an instruction from a microcontroller and decodes address information into a gating signal corresponding to a register. The novel CAN FD controller based on a CAN FD bus communication protocol specification and a practical demand of a microwave power distributed control system has excellent performances and has the important practical engineering significance.

Description

technical field [0001] The invention belongs to the technical field of CAN controllers, in particular to a novel CAN FD controller. Background technique [0002] As a new heat source with a unique mechanism of action, microwave has natural advantages in material drying, high-temperature sintering, smelting and extraction, and is widely used in food, agriculture, light industry, chemistry and other fields. [0003] Compared with traditional convection drying, the lignite drying production line using microwave as heat source has significant advantages such as safety, high efficiency, energy saving and environmental protection. According to the actual needs of the microwave lignite drying production line of Nanjing Sanle Company, the current microwave power distributed control system is designed. The distributed control system connects the upper computer and the embedded controller nodes distributed on the production line through the CAN bus to realize data exchange. As the mo...

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Problems solved by technology

[0016] In 2011, R.I.Davis, a real-time system research group at York University, pointed out that the current analysis of CAN is based on the assumption that the highest priority information that each node in the network is going to send will get bus arbitration, but in fact, some CAN drivers The use of first-in-first-out queues by devices rather than priority-based queues invalidates this assumption, so R.I. Davis performed a test on the response time of a CAN frame as it propagates through a network with both nodes using FIFOs and nodes using priority queues. Analysis, and proposed the optimal allocation strategy, through case and experimental evaluation, the results show that the FIFO queue has an adverse effect on the real-time performance of CAN

[0029] In 2014, K.W.Schmidt proposed an algorithm for calculating the priority order, which solved the problem of recalculating the priority of newly added messages in the existing queue

[0030] In 2014, P.S. Murvay pointed out that most of the current CAN security research focuses on encrypting the protocol layer, and this method increases the communication and computing overhead, and is not conducive to system compatibility.

[0036] In 2015, Zhao Junyan of Hunan University and others analyzed the existing simplified search and exhaustive search algorithms, pointing out that they did not consider the impact of some high-priority messages when analyzing the aperiodic interference of gateway messages, and proved that when gateway messages are sent simultaneously The aperiodic interference generated is the largest, so an improved analysis method for the worst response time of the CAN network based on gateway interconnection is proposed

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