CN107102813B

CN107102813B - Sensor data acquisition method for classified storage

Info

Publication number: CN107102813B
Application number: CN201610093526.8A
Authority: CN
Inventors: 李华耀
Original assignee: Hefei Ingenic Technology Co ltd
Current assignee: Hefei Ingenic Technology Co ltd
Priority date: 2016-02-19
Filing date: 2016-02-19
Publication date: 2020-08-18
Anticipated expiration: 2036-02-19
Also published as: CN107102813A

Abstract

The invention discloses a sensor data acquisition method with hierarchical storage, which comprises the following steps: performing functional configuration on the sensor according to preset parameters; acquiring external measurement data by using a sensor, and storing the data into an FIFO (first in first out) unit in the sensor; checking whether the FIFO unit is full, if so, carrying the data in the FIFO unit to a RAM storage unit in the sensor by the MCU; if not, returning to the step 2; checking whether a RAM storage unit in the sensor is full; if the RAM memory unit is full, the CPU moves the data in the RAM memory unit to the DDR memory unit through the CPU unit. The invention adopts a mode of storing data in a grading way, so that the MCU only transports the data to the RAM when the FIFO unit is full, and after the RAM is full, the CPU transports the data to the DDR, thereby reducing the scheduling times of the CPU and achieving the purpose of reducing the power consumption.

Description

Sensor data acquisition method for classified storage

Technical Field

The invention relates to a method for acquiring data by using a sensor, in particular to a method for acquiring data by hierarchically storing the sensor.

Background

The Sensor is a detecting device which can sense the measured information and convert the sensed information into electric signals or other required forms of information output according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, record, control and the like. The method is the first link for realizing automatic detection and automatic control. For example, G-sensor: and a Gravity-sensor (G-sensor) which can sense the change of the acceleration force, convert the change into an electric signal and then send the electric signal to a microprocessor for calculation and analysis.

The importance of data collection is quite significant today in the widespread use of computers. It is a bridge connecting a computer with the outside physical world. The sensor has various structures, and the sensor in the invention is particularly integrated with an FIFO (first in first out) or a data acquisition module with an MCU (microprogrammed control unit). The smart device in the present invention refers to a device that carries an SOC and runs an operating system. In the prior art, after the sensor collects Data, the G-sensor equipped intelligent device, such as an Android platform equipped intelligent device, directly sends the Data to a DDR (Double Data Rate Double Data synchronous dynamic random access memory) for user query. As shown in fig. 1, in an actual situation, a user does not always inquire the information, for example, when a person runs, the user uses the sensor to collect the number of steps, and generally, the user can inquire how many steps he runs after the running is finished, so that it is not necessary to refresh the data collected by the sensor into the DDR in real time, which increases power consumption and causes waste of electric energy.

The invention aims to solve the defects mentioned above, and the data is stored in a grading way, and when the user inquires or collects the data to reach the storage space of the grade, the data is pushed step by step, so that the CPU scheduling times are reduced, the purpose of reducing the power consumption is achieved, and the user experience is not reduced.

Disclosure of Invention

One of the objectives of the present invention is to provide a sensor data acquisition method with hierarchical storage to overcome the above-mentioned drawbacks, the method comprising the following steps:

step 1, configuring the functions of the sensor according to preset parameters, wherein the sensor comprises an FIFO unit and an MCU processor unit, and the MCU processor unit comprises an RAM storage unit;

step 2, collecting external measurement data by using the sensor, and storing the measurement data into the FIFO unit;

step 3, checking whether the FIFO unit is full; if yes, the MCU processor unit carries the data in the FIFO unit to the RAM storage unit; if not, returning to the step 2;

step 4, checking whether the RAM storage unit is full; if yes, the CPU processor unit communicates with the MCU processor unit, and data in the RAM storage unit is transported to the DDR memory unit through the CPU processor unit; if not, returning to the step 3;

and 5, the data in the DDR storage unit is provided for a user to inquire in real time.

Preferably, the hierarchically stored sensor data acquisition runs in an Android system or a windows system.

Preferably, the checking whether said FIFO element is full is performed by polling the amount of data stored in said FIFO element according to a predetermined time cycle.

Preferably, the checking whether the FIFO cells are full is performed by means of an interrupt signal, and a data full overflow signal is set as the interrupt signal.

Preferably, the checking whether the RAM storage unit is full is performed by using a timing method to query the data amount stored in the RAM storage unit according to a predetermined time cycle.

Preferably, the checking whether the RAM memory cell is full is performed by using an interrupt signal, and a data full overflow signal is set as the interrupt signal.

Preferably, the MCU processor unit and the CPU processor unit transmit data by using I2C or SPI protocol.

Preferably, the configuring the function of the sensor according to the predetermined parameter includes: configuring the size of the FIFO element and configuring the size of the RAM storage element.

Preferably, the capacity of the DDR memory unit is greater than that of the RAM memory unit, and the storage capacity of the RAM memory unit is greater than that of the FIFO unit.

Preferably, the sensor is one of an infrared sensor, a pressure sensor, a position sensor and a gravity sensor.

The sensor data acquisition method of the hierarchical storage adopts the multilevel storage, and does not directly store the acquired data to the DDR storage unit in real time, so that the read-write frequency of the DDR storage unit is reduced, the power consumption of a system is saved, and the endurance time of equipment is prolonged.

Drawings

FIG. 1 is a block diagram of the technical solution of the present invention.

Fig. 2 is a flow chart of a specific implementation of the method of the present invention.

Detailed Description

In order to make those skilled in the art understand the present invention, the following description specifically describes the preferred embodiments of the present invention, and the accompanying drawings illustrate the components and technical effects of the present invention.

The Android system is a system used by a typical intelligent sensor, and the sensor is generally collocated in an intelligent device, and in order to describe the invention in detail, the intelligent device carrying the intelligent sensor is taken as an example, and a structural diagram for realizing the technical scheme is given.

As shown in fig. 1, the sensor data collecting system of the present invention with hierarchical storage is a preferred embodiment of the present invention, wherein the sensor unit is one of an infrared sensor, a pressure sensor, a position sensor, a gravity sensor, etc., and may be other types of sensors. The sensor unit includes a measuring unit (not shown in the figure), a FIFO (first in first out memory unit), hereinafter referred to as FIFO unit, and a microcontroller MCU; the measuring unit is connected with the FIFO unit, and the data collected by the measuring unit is firstly stored in the FIFO unit. And the size of the FIFO cells may be set before the measurement starts.

In a preferred embodiment of the present invention, the MCU unit includes an internal memory RAM, and the FIFO unit is connected to the internal memory RAM. The data collected by the sensor unit is not directly sent to the RAM of the internal memory, but is sent to the FIFO unit first, and when the data stored in the FIFO unit is judged to be full or reach a certain threshold value, the data stored in the FIFO unit is transferred to the RAM of the internal memory in the MCU through the MCU control right. Preferably, the storage unit storage capacity of the FIFO is smaller than the capacity of the internal memory RAM.

In a preferred embodiment of the present invention, the hierarchical storage sensor data acquisition system further includes a CPU processor connected to the sensor unit, the CPU is further connected to a DDR memory unit, and the processor unit may be a single-core or dual-core processor; and in the data acquisition process, the data amount stored in the RAM of the internal memory is judged by the CPU, and when the data stored in the RAM is full and is about to overflow, the data in the RAM is transported to the DDR for a user to inquire and use. If the data stored in the RAM is not full, the state of the RAM is continuously detected without carrying the data.

Referring to FIG. 2, a flow chart of the present invention, in a preferred embodiment, first configures the function settings of the sensor. The measured data is not directly transmitted to the RAM, but is firstly transmitted to the FIFO unit, and the storage state of the FIFO unit is continuously detected by setting the storage threshold parameter of the FIFO unit, so as to judge whether the FIFO unit is full. The whole system is scheduled by a CPU (Central processing Unit), the CPU is communicated with an MCU (microprogrammed control Unit) in the Sensor through I2C or SPI (Serial peripheral interface), and data collected by the Sensor are carried to the DDR (double data rate); it should be noted that the main feature of the present invention is not the flow of data transmission, but the timing of data transportation, and the purpose of reducing power consumption by using the method. In the prior art, when the Sensor acquires data, the data is immediately carried into the RAM storage unit and then carried into the DDR unit by the CPU, the process is real-time, and the carrying process can be carried out as long as the Sensor acquires the data; the data are put into the FIFO unit when the Sensor collects the data, but the data are not immediately transported into the RAM but temporarily stored in the FIFO unit at the moment, the data in the FIFO unit are completely transported into the RAM until the FIFO unit is full and overflows, and then whether the data in the RAM are full or not is judged, wherein the processes are finished by the MCU in the Sensor; when the RAM data is judged to be full and about to overflow, the data in the RAM are completely transported to the DDR for a user to inquire in real time; the transporting operation is completed by the CPU, so the CPU is scheduled only once at this time, and the CPU is frequently scheduled in the traditional method.

Through the process, the invention adopts a mode of storing data in a grading way, the MCU only carries the data to the RAM when the FIFO unit is full by configuring the Sensor, and after the RAM is full, the CPU is informed through I2C or SPI to carry the data to the DDR by the CPU. The number of times of dispatching of the CPU is reduced, and the purpose of reducing power consumption is achieved.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims

1. A sensor data acquisition method with hierarchical storage is characterized by comprising the following steps:

step 5, the data in the DDR memory unit is used for a user to inquire in real time;

the sensor data collection stored in a grading way is operated in an Android system or a windows system;

checking whether the FIFO unit is full or not by adopting a timing method, and circularly inquiring the data amount stored in the FIFO unit according to a preset time;

checking whether the RAM storage unit is full or not by adopting a timing method, and circularly inquiring the data amount stored in the RAM storage unit according to preset time;

data are transmitted between the MCU processor unit and the CPU processor unit by adopting an I2C or SPI protocol;

configuring the functions of the sensors according to predetermined parameters includes: configuring the size of the FIFO unit and configuring the size of the RAM storage unit;

the capacity of the DDR memory unit is larger than that of the RAM memory unit, and the storage capacity of the RAM memory unit is larger than that of the FIFO unit;

the sensor is one of an infrared sensor, a pressure sensor, a position sensor and a gravity sensor.