Parameter storage mechanism of embedded system

Abstract

The invention discloses a parameter storage mechanism of an embedded system. The parameter storage mechanism comprises an abstraction layer interface, read-write integrity, real-time performance, repeated write-in filtering and default parameter automatic generation. According to the parameter storage mechanism in claim 1, the parameter storage mechanism is characterized in that: 1) a group of configuration parameters are placed in a structured memory block with continuous addresses, and an application program directly accesses member variables in the memory block when reading and writing theconfiguration parameters, so that the problem of real-time performance is solved; 2) two storage areas with non-overlapping addresses are specified on the storage medium, and the memory block is mapped to the two storage areas on the storage medium through a control head with a CRC check field; 3) data is loaded from the storage medium to the memory block only when the system is initialized, and only one-way writing from the memory block to the storage medium is executed in a system main cycle, and 4) data writing takes the storage area as a unit, and one storage area is always in a backup state, so that the reliability problem is solved.

Description

technical field [0001] The invention relates to a configuration parameter storage mechanism of an embedded system, which can solve the problems of real-time writing of a small number of configuration parameters and data integrity without resorting to the real-time scheduling function of an operating system, and is mainly used for low-end small single-chip microcomputer systems without an operating system The parameter configuration belongs to the field of embedded software design. Background technique [0002] In 8051, MSP430 and ARM and other single-chip embedded systems, it is often necessary to save some configuration parameters set by the user through the serial port, network or man-machine interface during the running process. The correct writing of the parameters is very important, if there is no writing or the writing information is incomplete, it will have an adverse effect on the operation of the system. The onboard storage media of embedded systems are more common...

AI Technical Summary

Problems solved by technology

[0003] (1) Both of these two storage media are in the busy state of writing. Flash media has a necessary erase operation before writing. The busy time is usually tens of milliseconds or even hundreds of milliseconds, which is very important for real-time performance. Embedded systems with relatively high requirements, such as radio transceivers, are unacceptable, and system freezes exceeding 1ms will cause message reception failures;

[0004] (2) During the process of writing parameters, the system may suddenly be powered off or powered on again. If the system reset or restarted happens during the half of the parameter writing process, the integrity of the data will be compromised. will be destroyed, in which case a data backup mechanism is required;

[0005] (3) During the power-on process of the system, due to power jitter or power-on instability, and at this time the processor has completed the boot and enters the parameter loading stage, it may cause parameter loading errors. At this time, an error is required. Detection mechanisms and means of data recovery;

[0006] (4) When the system leaves the factory or is reset by the customer on site, the configuration parameters will be completely cleared, and the data in the storage medium will also be completely invalid

In mass production of products, it takes a lot of time to manually preset the default parameters of each system, and it is also prone to errors. At this time, a mechanism is also needed to provide a set of default parameters to configure the operation of the system;

[0007] (5) E2PROM and Flash media also have a limit on the life of the write operation. If it exceeds a certain number of times, it will cause erasure and write fatigue and irreversible permanent damage, so that data can no longer be stored reliably

Driven by the state logic, the application program will frequently refresh configuration parameters in some cases, and the values ​​of some member variables are actually unchanged, so a large number of repeated write operations will reduce the service life of the memory. A mechanism to filter out those invalid requests and only perform truly valid operations

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