Bus error recovery processing method

Abstract

The invention provides a bus error recovery processing method, which belongs to the technical field of CAN buses. The invention solves the problem that when the existing bus node enters a bus-off state by error, the bus node is difficult to recover to a normal operation state. In the bus error recovery processing method, the node detects the error and enters the 'bus-off state' to carry out error recovery processing operation which comprises the following steps: a, an error detection module detects error from time to time, and meanwhile, an error handling module controls the node to be in a corresponding state according to the counted error detected by the error detection module; b, a main controller controls the node to be disconnected with the CAN bus; c, the disconnection time T0 is kept, and when the time T0 is up, the step d is carried out; d, the main controller controls a CAN controller to be restarted up; and e, the CAN controller monitors the level signal of the CAN bus. The bus error recovery processing method has the advantage of timely eliminating the error detected on the node.

Description

technical field [0001] The invention belongs to the technical field of CAN bus, and relates to a bus error recovery processing method. Background technique [0002] The CAN protocol provides a complete error detection and error status mechanism, which can detect CRC errors, confirmation errors, format errors, bit errors and bit stuffing errors, etc. When a node detects a bus error, it will send an error frame to the All other nodes report. The sending of error messages will be aborted and resent as soon as possible. And according to the count value (Tx, Rx) of the internal error counter, each CAN node can be set to three working modes: active error state, passive error state and bus off state. [0003] When the sending error or receiving error count is less than 128, the node is in the "active error state"; when an error occurs or the receiving error count is greater than 128, the node is in the "passive error state"; and when the error count is greater than 256, the node ...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that after the existing nodes enter the "bus off state", there is no corresponding effective operation for processing, causing the CAN controller to monitor the level on the bus all the time, and only 11 consecutive hidden It enters the normal state (active error state) after the character is set, causing the node in the bus-off state to wait for the satisfaction of the monitoring condition, and cannot work normally

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