CN110825681A - LBE bus-based SMHK381 test method - Google Patents
LBE bus-based SMHK381 test method Download PDFInfo
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- CN110825681A CN110825681A CN201910988838.9A CN201910988838A CN110825681A CN 110825681 A CN110825681 A CN 110825681A CN 201910988838 A CN201910988838 A CN 201910988838A CN 110825681 A CN110825681 A CN 110825681A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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Abstract
The invention relates to a test method of SMHK381 based on an LBE bus, which comprises the following steps: s1: communication; s2: initialization of SMHK 381; s3: testing a transceiving function; s4: an internal wrap test; s5: an external wrap test; the multipurpose RS485/RS422 on the LBE bus is used for serial port communication to realize internal wrap-around test, external wrap-around test and transceiver circuit test, so that the SMHK381 chip and the peripheral circuits thereof can be rapidly positioned, waste in the production process is greatly reduced, resources are saved, and the cost is reduced; and the structure is simple, the work is reliable, the applicability is strong, and the practicability and the specificity are good.
Description
Technical Field
The invention relates to a circuit component testing method, in particular to a testing method of SMHK381 based on an LBE bus.
Background
The SMHK381 dual channel universal asynchronous receiver transmitter is a data communication device that provides two fully independent full duplex asynchronous data communication channels on a single chip that can operate in a query or interrupt driven application environment.
The SMHK381 and the surrounding circuits thereof play an important role in the communication of airborne equipment, but most of the existing documents are directed to SMHK381 chip application of a microprocessor-based system and an automatic test implementation method for an LBE bus mainboard, and a test method for the SMHK381 chip applied to the LBE bus and the surrounding circuits thereof is lacked. Based on this, the invention proposes a test method of SMHK381 based on LBE bus, which can be separated from the whole airborne equipment for individual test.
Disclosure of Invention
In order to solve the problems, the invention provides a test method of SMHK381 based on an LBE bus.
A test method of SMHK381 based on LBE bus comprises the following steps:
s1: communication: enabling the upper computer to communicate with the LBE bus control core plug-in through the RS-232;
s2: initialization of SMHK 381;
s3: and (3) testing the transceiving function: setting a mode register, enabling the SMHK381 to work in an external test working mode, closing an analog switch, enabling the serial port input and output of the SMHK381 to be connected with a test control board interface, and verifying through signals;
s4: internal wrap-around testing:
a: setting a mode register to enable the SMHK381 to work in a local loopback working mode, wherein a sending end and a receiving end of the SMHK381 are internally connected;
b: the upper computer controls the LBE bus to write a command word into the SMHK381 to read the value of the receiving and holding register, and then the value is read through the data bus so as to verify the correctness of the receiving and sending processes;
s5: external wrap-around test:
a: when SMHK381 is initialized, the working mode of the SMHK381 is set to work in an external test mode, and an LBE bus control core plug-in board converts serial data sent by an upper computer into parallel data and sends the parallel data to the SMHK 381;
b: the host computer controls the LBE bus to write a command word into the SMHK381 to read the value of the receiving holding register, and then the command word is read through the data bus to verify the correctness of the transceiving process.
In step S2, under the control of the upper computer, the LBE bus control core plug-in controls the transmission and reception of the LBE bus signal to drive the LBE bus circuit, thereby writing a command word to the register of SMHK381, setting a communication baud rate, a protocol parameter, and an interrupt parameter class, and initializing SMHK 381.
The specific procedure of step S3 is as follows:
a: and (3) sending: after initialization, the LBE bus control core plug-in converts serial data sent by an upper computer into parallel data and sends the parallel data to the SMHK381, the SMHK381 converts the parallel data into RS-485/422 signals according to a communication protocol and sends the signals to a test control board, and the test control board processes the RS-485/422 signals and sends the signals to the upper computer for comparison and verification;
b: receiving: the test control board converts RS-232 signals sent by the upper computer into RS-485/422 signals and sends the signals to SMHK381, the SMHK381 converts the signals into parallel data and sends the parallel data back to the LBE bus control core plug-in unit through bus data, and finally the LBE bus control core plug-in unit processes the signals and sends the signals to the upper computer for verification.
Neither step S4 nor step S5 requires the use of a test control board.
In step S5, the analog switch needs to be switched to disconnect the test control board, which is an external circuit, and the receiving/transmitting terminals of all channels are looped.
The invention has the beneficial effects that: the multipurpose RS485/RS422 on the LBE bus is used for serial port communication to realize internal wrap-around test, external wrap-around test and transceiver circuit test, so that the SMHK381 chip and the peripheral circuits thereof can be rapidly positioned, waste in the production process is greatly reduced, resources are saved, and the cost is reduced; and the structure is simple, the work is reliable, the applicability is strong, and the practicability and the specificity are good.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of a test control board according to the present invention;
FIG. 2 is a schematic diagram of the electrical connection between the test control board and the LBE test platform according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below.
As shown in fig. 1 and 2, a method for testing the smek 381 based on the LBE bus includes the following steps:
s1: communication: enabling the upper computer to communicate with the LBE bus control core plug-in through the RS-232;
s2: initialization of SMHK 381;
s3: and (3) testing the transceiving function: setting a mode register, enabling the SMHK381 to work in an external test working mode, closing an analog switch, enabling the serial port input and output of the SMHK381 to be connected with a test control board interface, and verifying through signals;
s4: internal wrap-around testing:
a: setting a mode register to enable the SMHK381 to work in a local loopback working mode, wherein a sending end and a receiving end of the SMHK381 are internally connected;
b: the upper computer controls the LBE bus to write a command word into the SMHK381 to read the value of the receiving and holding register, and then the value is read through the data bus so as to verify the correctness of the receiving and sending processes;
s5: external wrap-around test:
a: when SMHK381 is initialized, the working mode of the SMHK381 is set to work in an external test mode, and an LBE bus control core plug-in board converts serial data sent by an upper computer into parallel data and sends the parallel data to the SMHK 381;
b: the host computer controls the LBE bus to write a command word into the SMHK381 to read the value of the receiving holding register, and then the command word is read through the data bus to verify the correctness of the transceiving process.
In step S2, under the control of the upper computer, the LBE bus control core plug-in controls the transmission and reception of the LBE bus signal to drive the LBE bus circuit, thereby writing a command word to the register of SMHK381, setting a communication baud rate, a protocol parameter, and an interrupt parameter class, and initializing SMHK 381.
The specific procedure of step S3 is as follows:
a: and (3) sending: after initialization, the LBE bus control core plug-in converts serial data sent by an upper computer into parallel data and sends the parallel data to the SMHK381, the SMHK381 converts the parallel data into RS-485/422 signals according to a communication protocol and sends the signals to a test control board, and the test control board processes the RS-485/422 signals and sends the signals to the upper computer for comparison and verification;
b: receiving: the test control board converts RS-232 signals sent by the upper computer into RS-485/422 signals and sends the signals to SMHK381, the SMHK381 converts the signals into parallel data and sends the parallel data back to the LBE bus control core plug-in unit through bus data, and finally the LBE bus control core plug-in unit processes the signals and sends the signals to the upper computer for verification.
As shown in fig. 2, the test control board can be used for multi-channel communication test, the upper computer performs channel selection through the FPGA, the signal transceiver is used for converting serial port signals into signals which can be processed by the FPGA, and signals of a plurality of groups of RS-485/422 signal transceivers connected with the FPGA are all transmitted to the RS-232 signal transceiver.
The internal wrap test, the external wrap test and the receiving and transmitting function test of the SMHK381 are realized through data transmission and signal verification, the method is suitable for fault location and performance detection of the SMHK381 chip based on the LBE bus and surrounding circuits of the SMHK381 chip, cost can be effectively reduced, and operation is simple.
As shown in fig. 1, after the analog switch is turned on, the control signal of the test control board connected via the serial port is transmitted to the upper computer, the decoding control inputs the control to the SMHK381, the LBE bus core control board matched with the serial port transmits the bus data to the SMHK381, and the LBE bus core control board controls the output via the bus data and the decoding control.
Neither step S4 nor step S5 requires the use of a test control board.
In step S5, the analog switch needs to be switched to disconnect the test control board, which is an external circuit, and the receiving/transmitting terminals of all channels are looped.
The multipurpose RS485/RS422 on the LBE bus is used for serial port communication to realize internal wrap-around test, external wrap-around test and transceiver circuit test, so that the SMHK381 chip and the peripheral circuits thereof can be rapidly positioned, waste in the production process is greatly reduced, resources are saved, and the cost is reduced; and the structure is simple, the work is reliable, the applicability is strong, and the practicability and the specificity are good.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A test method of SMHK381 based on LBE bus is characterized in that: the method comprises the following steps:
s1: communication: enabling the upper computer to communicate with the LBE bus control core plug-in through the RS-232;
s2: initialization of SMHK 381;
s3: and (3) testing the transceiving function: setting a mode register, enabling the SMHK381 to work in an external test working mode, closing an analog switch, enabling the serial port input and output of the SMHK381 to be connected with a test control board interface, and verifying through signals;
s4: internal wrap-around testing:
a: setting a mode register to enable the SMHK381 to work in a local loopback working mode, wherein a sending end and a receiving end of the SMHK381 are internally connected;
b: the upper computer controls the LBE bus to write a command word into the SMHK381 to read the value of the receiving and holding register, and then the value is read through the data bus so as to verify the correctness of the receiving and sending processes;
s5: external wrap-around test:
a: when SMHK381 is initialized, the working mode of the SMHK381 is set to work in an external test mode, and an LBE bus control core plug-in board converts serial data sent by an upper computer into parallel data and sends the parallel data to the SMHK 381;
b: the host computer controls the LBE bus to write a command word into the SMHK381 to read the value of the receiving holding register, and then the command word is read through the data bus to verify the correctness of the transceiving process.
2. The method for testing SMHK381 based on LBE bus as claimed in claim 1, wherein: in step S2, under the control of the upper computer, the LBE bus control core plug-in controls the transmission and reception of the LBE bus signal to drive the LBE bus circuit, thereby writing a command word to the register of SMHK381, setting a communication baud rate, a protocol parameter, and an interrupt parameter class, and initializing SMHK 381.
3. The method for testing SMHK381 based on LBE bus as claimed in claim 1, wherein: the specific procedure of step S3 is as follows:
a: and (3) sending: after initialization, the LBE bus control core plug-in converts serial data sent by an upper computer into parallel data and sends the parallel data to the SMHK381, the SMHK381 converts the parallel data into RS-485/422 signals according to a communication protocol and sends the signals to a test control board, and the test control board processes the RS-485/422 signals and sends the signals to the upper computer for comparison and verification;
b: receiving: the test control board converts RS-232 signals sent by the upper computer into RS-485/422 signals and sends the signals to SMHK381, the SMHK381 converts the signals into parallel data and sends the parallel data back to the LBE bus control core plug-in unit through bus data, and finally the LBE bus control core plug-in unit processes the signals and sends the signals to the upper computer for verification.
4. The method for testing SMHK381 based on LBE bus as claimed in claim 1, wherein: neither step S4 nor step S5 requires the use of a test control board.
5. The method for testing SMHK381 based on LBE bus as claimed in claim 1, wherein: in step S5, the analog switch needs to be switched to disconnect the test control board, which is an external circuit, and the receiving/transmitting terminals of all channels are looped.
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