Identification, familiarization of unfamiliar RAM and initialization of system parameters First of all, the program cannot initialize the system parameters to the default values ​​every time it is started and run. One is because it is very troublesome to set the system parameters every time it is turned on. This is because the watchdog reset system will change the control parameters to the default values ​​when the system is restarted. The operator does not necessarily know that the instrument has been reset, and it is dangerous that the control parameters cannot be modified in time. Secondly, the program cannot simply use the data of the specified address unit in the RAM chip as a parameter stored in the past, because the current RAM chip may never be used, it is an unfamiliar chip, and all on-chip random numbers. Therefore, the program should have the ability to identify the RAM chip. When the chip is an unfamiliar chip, set all parameters to the default values, and mark the RAM chip with a soft tag to make it familiar. When the chip is not unfamiliar, use the unit ’s parameter. The method of marking is to write a set of numbers with distinctive characteristics among several units fixed in the RAM chip. The program reads the numbers in these units and the number of logos every time the computer is restarted. If they are inconsistent, it is unfamiliar. Chip, and proceed accordingly.
This paper carefully analyzes the problems related to the use of non-volatile RAM for data storage and protection. On this basis, the pointer data is used to solve the problem of the definition and address coincidence of permanent data. The method of marking the RAM chip is used to solve it. In order to solve the problem of initialization of control parameters brought about by the replacement of RAM chips, the entire processing process is transparent to the use, installation and debugging personnel. After the actual application of a certain type of instrument, the historical alarm data can be stored in a large amount. There is no need to reset the parameters when the system is powered on. The historical alarm data is automatically cleared after the RAM chip is replaced, and the parameters are restored to the default values, indicating that this method is easy to use and has relatively high reliability. high.
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