A method, device and system for resetting an MCU
A technology of reset signal and square wave signal, which is applied in the direction of response error generation, redundant data error detection in operation, instrumentation, etc. Timely reset processing and other issues to achieve the effect of improving reliability
Active Publication Date: 2020-02-04
BEIJING JINGWEI HIRAIN TECH CO INC
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Problems solved by technology
[0003] In the dual MCU structure used in existing automotive electronic products, the main MCU and the slave MCU transmit data to each other through the serial bus. Once the main MCU fails, the main MCU must reach the preset dog feeding time when the timing value reaches the preset time. value, the corresponding watchdog can send a reset signal by sending a feed dog signal, thereby resetting the main MCU to eliminate the fault. However, the existing reset method of the main MCU cannot reset in time when a fault is found, thus As a result, the master MCU continues to send fault data to the slave MCU, which seriously affects the reliability of the car system operation, and even poses a threat to the life safety of car users.
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[0079] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0080] This embodiment discloses a method for resetting an MCU, which is applied to a slave MCU. Please refer to the attached figure 1 , the method specifically includes the following steps:
[0081] S101: In a normal working state, start a timer for timing, and generate a first timing value;
[0082] Specifically, when both MCUs are in the normal working state, the timer set in the slave MCU will start counting. At this time, the first counting time value ca...
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The invention provides an MCU resetting method, apparatus and system. The method comprises the steps of judging whether a square wave signal sent by a master MCU is received in a time value or not when a first timing time value generated according to timing of a timer reaches a first preset time threshold, thereby enabling a slave MCU to timely obtain whether the master MCU has a fault or not; and then when it is judged that the slave MCU still does not receive the square wave signal sent by the master MCU when the first timing time value reaches the preset time threshold, timely sending a first resetting signal to the master MCU, thereby enabling the master MCU to perform resetting operation. The master MCU can be timely stopped from continuing to send fault data to the slave MCU, so that the problem that the slave MCU performs related operations by utilizing the fault data is effectively avoided and the reliability of car system operation is improved.
Description
technical field [0001] The invention relates to the field of automotive electronic monitoring, and more specifically relates to a method, device and system for resetting an MCU. Background technique [0002] With the increasing integration of communication, connection, computer technology and automobiles, automotive MCUs are playing an increasingly important role in automotive electronics as a core component, and the number of MCU applications in automobiles has also increased accordingly. Among them, the dual MCU structure, as the main technical means to improve the reliability of the automotive system, is increasingly used in automotive electronic products. [0003] In the dual-MCU structure used in existing automotive electronic products, the master MCU and the slave MCU transmit data to each other through the serial bus. Once the master MCU fails, the master MCU must reach the preset feeding time when the timing value reaches the preset time. value, the corresponding wa...
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IPC IPC(8): G06F11/07G06F11/14
CPCG06F11/0757G06F11/1438
Inventor 曹海建赵广平刘志刚刘浩
Owner BEIJING JINGWEI HIRAIN TECH CO INC