CN106919479B

CN106919479B - Real-time log recording method of embedded device controller

Info

Publication number: CN106919479B
Application number: CN201510984551.0A
Authority: CN
Inventors: 宋恒利
Original assignee: Beijing Aeonmed Co Ltd
Current assignee: Beijing Aeonmed Co Ltd
Priority date: 2015-12-24
Filing date: 2015-12-24
Publication date: 2020-04-24
Anticipated expiration: 2035-12-24
Also published as: CN106919479A

Abstract

The invention relates to a real-time log recording method of an embedded device controller, which comprises the following steps: judging whether a file system exists in the embedded device controller, if so, storing the log message in a file mode, if not, judging whether the number of idle bytes in a communication port cache is larger than the length of the log message to be sent, if so, copying the data of the log message into a sending cache of the communication port when the communication port is not busy, resetting the memory address and the sending length of the DMA, and enabling the DMA to send.

Description

Real-time log recording method of embedded device controller

Technical Field

The invention relates to an embedded device, in particular to a real-time log recording method of an embedded device controller.

Background

The real-time log records the real running process of the software, and is generally used for debugging the software or positioning the position of a fault in the running process of the software. The embedded equipment controller such as a breathing control unit board of an anesthesia machine in the current market has the function of uploading effective data, but does not have the function of outputting real-time logs, and when a fault occurs, technicians generally analyze the fault when waiting for the fault to be recovered, and the field fault cannot be analyzed and processed at the first time.

Disclosure of Invention

The invention aims to overcome the defect that a technician cannot timely process field faults because the existing embedded device controller cannot timely output log information in real time, and thus, the real-time log recording method is provided.

In order to achieve the above object, the present invention provides a real-time logging method for an embedded device controller, comprising:

step 1), judging whether a file system exists in an embedded device controller, if so, executing the next step, otherwise, executing the step 3);

step 2), storing the log message in a file mode, then judging whether the log message needs to be output in real time, if so, executing the next step, otherwise, ending the operation;

step 3), judging whether the number of idle bytes in the communication port cache is larger than the length of the log message to be sent, if so, executing the next step, otherwise, executing the step 6); the communication port comprises one of a serial port, a network port and a wireless port;

step 4), judging whether the communication port is in a busy state, if the communication port is in a non-busy state, executing the next step, if the communication port is in the busy state, copying a data frame of the log message to the next position of a buffer area of the communication port, writing the address and the length of the data frame into a queue to be sent, and executing the next step after the communication port is in the non-busy state;

step 5), copying the data of the log message into a sending cache of a communication port, resetting the memory address and the sending length of the DMA, enabling the DMA to send, and then executing step 7);

step 6), the number of idle bytes in the communication port cache is smaller than the length of the data to be sent, the step 4) is executed after the number of idle bytes in the communication port cache is released and is increased to enable the number of idle bytes in the communication port cache to be larger than or equal to the length of the data to be sent;

step 7), DMA sends the log message data, and sets the busy state in the sending process;

step 8), in the interrupt of the completion of the DMA transmission, executing the following operations:

step 8-1), resetting the busy state, namely changing the busy state of the communication port into a non-busy state;

step 8-2), checking whether data exist in the queue to be sent, if data to be sent exist, moving the data out of the queue to be sent, then executing step 3), and if data to be sent do not exist, executing step 8-3);

step 8-3), checking the waiting queue, if the waiting queue comprises the data of the log message, executing the step 3) instead, and if not, finishing the operation.

The invention has the advantages that:

the method of the invention can transmit and record the log information in real time, and ensure the integrity of the log information. When a fault occurs, technicians can check the log and quickly locate the fault point.

Drawings

FIG. 1 is a schematic diagram of a log sending flow;

fig. 2 is a flowchart of a real-time logging method of an embedded device controller of the present invention.

Detailed Description

The invention will now be further described with reference to the accompanying drawings.

The principle of the log sending process is shown in fig. 1, log data to be sent is copied to a sending cache, a sending address and a sending length are written into a message queue, after a sending task judges that a Direct Memory Access (DMA) is idle, the message queue data is received, the Memory address and the length of the DMA are reset, the DMA sending is enabled, the CPU intervention is not needed in the sending process, the CPU burden is greatly reduced, and the real-time performance is improved to a certain extent. The relationship between data sending time, data quantity and data cache can also be found from the log sending process: data caching is space-to-time, and multiplexing is time-to-space.

The content of the log related in the invention can be defined according to the characteristics of each task, and can comprise a statistical log, a sensor log, a communication port interactive instruction log, a working state log of each module and the like. The protocol of the log may define different implementations of data frame header, instruction, length, check, etc.

Referring to fig. 2, the real-time logging method of an embedded device controller of the present invention includes:

In the method, the log content of each task is completely copied into a data buffer, and if the space of the data buffer is insufficient, the task needs to wait until a free space is available for copying. This ensures the integrity of the log transfer.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A real-time logging method of an embedded device controller comprises the following steps:

step 3), judging whether the number of idle bytes in the communication port cache area is larger than the length of the log message to be sent, if so, executing the next step, otherwise, executing the step 6); the communication port comprises one of a serial port, a network port and a wireless port;

step 5), copying the data of the log message into a communication port cache region, resetting the memory address and the transmission length of the DMA, enabling the DMA to transmit, and then executing step 7);