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Novel embedded system monitoring method

An embedded system and a new type of technology, applied in the embedded field, can solve the problems that the hardware watchdog cannot be shielded and the watchdog is invalid during initialization configuration, etc., and achieve the effects of flexible and convenient use, reduced software resource occupation, and strong reliability

Pending Publication Date: 2022-03-01
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to avoid the deficiencies of the prior art, the present invention proposes a new embedded system monitoring method to solve the defects that the traditional software watchdog is invalid during initialization configuration and cannot be shielded after the hardware watchdog starts.

Method used

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Embodiment Construction

[0021] The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0022] In the present invention, the software runs in the DSP processor of TI Company, model TMS320C6414T, and the logic runs in the FPGA of Altera Company, model EP1S20F484. The DSP is connected with RS422 protocol chip and interface chip to realize RS422 communication. The external crystal oscillator frequency of FPGA is 40MHz, which is used as the working clock of the logic.

[0023] DSP processor and FPGA are connected through EMIF bus, and DSP can read and write FPGA internal registers through EMIF bus. The DSP processor receives the RS422 serial port command through the interrupt mode. When the command word is "0xaa 0x1e 0x55", the DSP writes 1 to the FPGA internal register WDI_CTL through the EMIF bus, and switches to the combined software and hardware dog feeding mode. When t...

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Abstract

The invention relates to a novel embedded system monitoring method, belongs to the technical field of embedding, and overcomes the defects that in a traditional monitoring method, a software watchdog is invalid during initialization configuration and a hardware watchdog cannot be shielded after being started. According to the novel monitoring method, dog feeding is achieved in a software and hardware combined mode, the running conditions of software and logic in the system can be monitored at the same time, and the system is reset when running is abnormal. According to the monitoring method, the dog feeding mode of the watchdog monitoring chip can be switched through an RS422 serial port command, only the logic operation condition is monitored during pure logic dog feeding, the software and logic operation conditions are monitored at the same time during software and hardware logic combined dog feeding, and according to the monitoring method, initialization is not needed during power-on, software resource occupation is reduced, reliability is high, and use is flexible and convenient.

Description

technical field [0001] The invention belongs to the field of embedded technology, and in particular relates to a novel embedded system monitoring method. Background technique [0002] Traditional embedded system monitoring methods include two types: software watchdog and hardware watchdog. Among them, the software watchdog mostly uses the timer inside the processor as the watchdog, feeds the dog within a limited time through software, and resets the software after timeout. The watchdog in this mechanism needs initialization and configuration time. If the software runs away during initialization, the watchdog cannot reset the system, so the reliability of the watchdog is low. The hardware watchdog usually uses a timer circuit. The program clears the timer within a limited time to feed the dog. After the timeout, the timer circuit outputs a reset signal. The watchdog mechanism can run when it is powered on, and has high reliability. The disadvantage is that it cannot be stop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/07G06F11/14G06F11/36
CPCG06F11/0757G06F11/1438G06F11/1441G06F11/362G06F11/3664
Inventor 臧佳靳松阳李成杰
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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