Small multichannel serial data recorder

Abstract

The invention discloses a small multichannel serial data recorder. A control structure of FPGA+ARM is adopted in the recorder, a high-density large-capacity CF card is used as a storage medium, the FPGA carries out serial-parallel conversion and frame header detection on multichannel serial input data after level switch, and an ARM processor writes data of all channels in the CF card in a modified FAT23 file format by adopting the strategy of priority dynamic adjustment under the temporary storage cooperation of two stages of data. When the recorder detects the situation that a power supply voltage is lowered to an alarm threshold value, data received at the power-down moment are stored in the CF card, and the function of protecting the data at the power-down moment is effectively achieved.

Description

technical field [0001] The invention relates to a data recorder, in particular to a small multi-channel serial data recorder for recording serial data such as flight parameters, inertial navigation, radar images, and train running states. Background technique [0002] Serial data loggers are widely used in environments such as aircraft, locomotives, ships, and industrial sites that require real-time recording of equipment operating parameters. The recorder with high stability can ensure the accuracy of data recording, which is beneficial to correctly judge the status and performance of the equipment, so as to ensure the normal operation of the equipment. [0003] The storage mode of the serial data recorder is divided into dump and direct storage. Dumping refers to storing data in a large-capacity memory chip, and transferring the data on the memory chip to the computer after the task is completed. In some designs using the dump method, the input data is first stored in th...

AI Technical Summary

Problems solved by technology

The advantages of the dump method are: high integration of equipment, low power consumption, strong shock resistance, and high reliability; disadvantages: the link of data export is added. After the task is completed, the equipment needs to be removed for data dump or The computer is arranged next to the task equipment to dump data, which is time-consuming and laborious, and it is not easy to use

Especially when the file system becomes huge and the files are small, the time consumption of the above search process will become the main time overhead of file creation

[0009] To sum up, the advantages of the FAT32 file system are: using the linked list structure with FAT, the physical storage space can be fully utilized; the disadvantage is: when there are many files in the storage and the files are relatively fragmented, the establishment of the files takes a lot of time. Seriously restricts the data read and write speed

[0010] The disadvantages of the transfer method are: the link of data export is added. After the task is completed, the device needs to be removed to transfer the data or take the computer to the task device to transfer the data, which is time-consuming and laborious and inconvenient to use.

[0011] The problems of the direct storage method are: 1) After using the embedded computer, the volume, power consumption, weight, and redundancy of the system are relatively large, and the cost is high, which is not conducive to the storage of data at the time of power failure; 2) Using the embedded operating system , abnormal power failure will cause the system to crash, resulting in failure to record data; 3) low efficiency

In order to ensure versatility, the file system that comes with the operating system has a large degree of redundancy, which reduces the efficiency of file operations and wastes the valuable read and write bandwidth of the storage medium; 4) There are many connectors used, and the system has poor seismic performance

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