Data storage methods

Abstract

A data storage method is applicable to a control unit and includes: acquiring a flow value from a flow sensor at predetermined time intervals and multiplying it by the predetermined time interval to obtain a value to be accumulated; adding the value to be accumulated to a small accumulated cache value of a dynamic random access memory; when it is determined that the small accumulated cache value is greater than a predetermined value, subtracting the predetermined value from the small accumulated cache value and adding the predetermined value to an actual accumulated value of the dynamic random access memory; determining whether the value of a cumulative storage of a flash memory is full; when it is determined that the value stored in the cumulative storage is not full, storing a cumulative detail offset value of the actual accumulated value of the dynamic random access memory into the cumulative storage of the flash memory.

Claims

1. A data storage method applicable to a flow sensor, a dynamic random access memory (DRAM), a flash memory, and a control unit, and implemented by the control unit, comprising the following steps: Step S1, acquiring a flow value from the flow sensor at predetermined time intervals, and multiplying the flow value by the predetermined time interval to obtain a value to be accumulated; Step S2, adding a small accumulated cache value stored in the DRAM to the value to be accumulated; Step S3, when it is determined that the small accumulated cache value is greater than a predetermined value, subtracting the predetermined value from the small accumulated cache value stored in the DRAM, and adding the predetermined value to an actual accumulated value stored in the DRAM, wherein the predetermined value is an integer, and the actual accumulated value is equal to an accumulated offset value of the higher significant bits of a binary representation plus an accumulated detail offset value of the lower significant bits of a binary representation; Step S4: After adding the predetermined value to the actual accumulated value, determine whether the value stored in the cumulative storage of the flash memory is full; and Step S5: When it is determined that the value stored in the cumulative storage is not full, store the accumulated detailed offset value of the dynamic random access memory into the cumulative storage of the flash memory.

2. The data storage method as described in claim 1 further includes steps S6, S7, S9, and S10 between steps S4 and S5. In step S6, when it is determined that the value stored in the accumulator is full, the accumulated offset value of the dynamic random access memory is added to the value stored in the accumulator. In step S7, it is determined whether the data stored in a setting memory of the flash memory is full. In step S9, when it is determined that the data stored in the setting memory of the flash memory is not full, the accumulated offset value of the dynamic random access memory is stored in the setting memory of the flash memory. In step S10, the value stored in the accumulator of the flash memory is erased.

3. The data storage method as described in claim 2, wherein, It also includes step S8 between steps S7 and S9. In step S8, when it is determined that the data stored in the setting memory of the flash memory is full, the data stored in the setting memory of the flash memory is erased, and then step S9 is executed.

4. The data storage method as described in claim 3, wherein, In step S5, the cumulative memory of the flash memory stores the cumulative detailed offset value in a unary encoded manner.

5. The data storage method as described in claim 1, wherein, In step S3, the predetermined value is 1.

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