A positioning method for CPU pin short circuit fault by using embedded software

An embedded software, short-circuit fault technology, applied in fault hardware testing methods, detection of faulty computer hardware, instruments, etc., to achieve the effects of easy programming, high efficiency, troubleshooting experience and seriousness

Inactive Publication Date: 2019-01-22
HENAN THINKER TRACK TRAFFIC TECH RES INST
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] The invention provides a method for locating short-circuit faults of CPU pins by using embedded software to solve the problems existing in the prior art

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  • A positioning method for CPU pin short circuit fault by using embedded software

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The invention provides a method for locating short-circuit faults of CPU pins by adopting embedded software. Since almost all Cortex-M CPU applications are connected with peripheral devices in hardware design, such as SRAM, DRAM, Nand Flash, NorFlash, LCD, Eth, Uart, SPI, I2C and other devices, general designers will address lines, Data line, liquid crystal screen line, ethernet line, SPI line, Uart line, I2C line are as special port line, and its IO port is configured as special function port; Execute short-circuit detection, after the short-circuit detection is completed, configure it as a special function port to complete the pin short-circuit detection function.

[0026] The present invention is mainly applied to Cortex type CPUs, but CPUs of other architectures also adopt the same concept to locate pin short-circuit fault...

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Abstract

The invention provides a positioning method for CPU pin short circuit fault by using embedded software, which includes: downloading a test program into the CPU and setting the CPU pin as an IO outputpin through the test program, setting one of the IO output pinsto be high by a test procedure, setting the other IO output pins to low level, after the test program outputs high level to the high level IO output pins, reading back the level of the output pins. If the readback level is high, the pin is normal, otherwise, the pin is short-circuited. The test program sets the next IO output pin high.The remaining IO output pins are set low for testing. Up to the point of traversing all the IO output tube scripts, the method can be used either as part of a single board debugger or as a startup self-test code for the application. At each startup, the pin state is tested, and in the event of a failure, it is guided safely, which is a function that other checks do not have.

Description

technical field [0001] The invention relates to a method for locating short-circuit faults of CPU pins, in particular to a method for locating short-circuit faults of CPU pins using embedded software. Background technique [0002] The existing CPU pin short-circuit inspection is controlled in the welding quality link, and the inspection methods adopted include visual inspection, multimeter test, X-ray inspection, and automatic optical inspection. There is no solution for short-circuit fault detection using embedded software. [0003] With the increasing number of CPU chip pins, the package size is getting smaller and smaller, the pins are getting denser, and the spacing is getting smaller and smaller. The visual inspection method and the multimeter measurement method have the disadvantages of low efficiency and high missed detection rate. And the quality of testing is affected by human factors such as experience and work attitude. [0004] The disadvantage of X-ray inspect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/22
CPCG06F11/2236G06F11/2273
Inventor 杨文阁刘杰张上伟
Owner HENAN THINKER TRACK TRAFFIC TECH RES INST
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