CN116449180A - Circuit signal measurement system and method suitable for development board - Google Patents
Circuit signal measurement system and method suitable for development board Download PDFInfo
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- CN116449180A CN116449180A CN202310381958.9A CN202310381958A CN116449180A CN 116449180 A CN116449180 A CN 116449180A CN 202310381958 A CN202310381958 A CN 202310381958A CN 116449180 A CN116449180 A CN 116449180A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
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Abstract
The invention discloses a circuit signal measurement system and a method suitable for a development board, wherein the circuit signal measurement system consists of the development board and a signal measurement module; the development board is detachably connected with the signal measurement module and is relatively independent; when the development board is electrically connected with the signal measurement module, the signal measurement module is used for measuring a measured signal generated by the development board; when the signal measuring module is used alone, the signal measuring module is used for measuring the input measured signal. The invention can measure the key electronic signals on the development board without dismantling the development board acrylic glass board mask; the reliability of the development board is greatly improved and the service life of the development board is prolonged as the development board is not separated from the protection of the acrylic glass board.
Description
Technical Field
The invention relates to the technical field of signal measurement, in particular to a circuit signal measurement system and method suitable for a development board.
Background
A development board (demo board) is a circuit board for embedded system development, and includes a series of hardware components such as a central processing unit, a memory, an input device, an output device, a data path/bus, and an external resource interface.
The development board is generally customized by an embedded system developer according to development requirements, and can also be researched and designed by a user. The development board is used for a beginner to know and learn the hardware and the software of the system, and meanwhile, part of the development board also provides a basic integrated development environment, a software source code, a hardware schematic diagram and the like. A common development board is MCU, ARM, FPGA, DSP development board.
During use of the development board, an oscilloscope is typically required to test and measure the electronic signals on the development board. To verify that the designed circuit or written program meets expectations.
The oscilloscope probe is a circuit device outside the oscilloscope and is used for detecting signals from a tested circuit, when the probe is connected to the tested circuit, the probe can become a part of a testing circuit, the probe is connected with the oscilloscope, and the probe can become a part of an oscilloscope measurement system.
In the process of using the development board, a user usually needs to use an external oscilloscope to measure the circuit signals on the development board. During measurement, an oscilloscope probe is used for accessing a measured signal on a development board, and the signal is accessed. Because of the non-expertise of the user, oscilloscope probes are easily connected across multiple circuit signal nodes, resulting in short circuits. Thereby causing damage to the development board. Greatly reduces the service life of the development board.
The development board is typically a circuit board, and if used in a school laboratory, each student typically assigns a board card. In the use process, the development board is easily damaged by artificial water splash and external force due to the non-professional property of students. Meanwhile, for the purposes of dust prevention and attractive appearance, a layer of acrylic glass is usually additionally arranged on the circuit board. Because the acrylic glass is covered on the surface of the circuit board, students cannot use an external oscilloscope probe to measure the electronic signals of the circuit board when using the development board. Or the acrylic glass plate needs to be removed for measurement, which is very inconvenient.
Users often encounter applications without an oscilloscope during use of the development board, such as during outdoor operations. In the process of measuring the electronic signals of the development board by using the oscilloscope, a user needs to read the schematic diagram and the PCB diagram, which is extremely inconvenient. At this time, the user has urgent need for a development board integrating the signal measurement function and prefabricating the option of measuring the signal.
Disclosure of Invention
In view of the above, the present invention provides a circuit signal measurement system and method for developing boards to solve the above-mentioned problems.
The invention discloses a circuit signal measurement system suitable for a development board, which consists of the development board and a signal measurement module; the development board is detachably connected with the signal measurement module and is relatively independent;
when the development board is electrically connected with the signal measurement module, the signal measurement module is used for measuring a measured signal generated by the development board;
when the signal measuring module is used alone, the signal measuring module is used for measuring the input measured signal.
Further, the development board is composed of a power input interface, a first power connector, a main control chip, a peripheral module, a signal buffer and a first signal connector;
the main control chip is respectively connected with the peripheral module and the signal buffer; the signal buffer is connected with the signal measurement module through the first signal connector;
a power supply path is formed between the power supply input interface and the first power supply connector;
the main control chip is used for generating a driving signal to drive the peripheral module; wherein the driving signal is a measured signal;
the signal buffer is used for impedance transformation of the driving signal and outputting a development board sampling signal.
Further, the signal measurement module is composed of a second signal connector, an analog switch, an analog front end, a trigger module, an analog-to-digital conversion module, a storage module, a control module and a display module;
the second signal connector is connected with the analog front end through the analog switch; the analog front end is connected with the storage module through the analog converter; the storage module is connected with the display module through the control module; the analog front end is connected with the control module through the trigger module;
an analog signal path is formed between the analog switch and the analog front end; a digital signal path is formed between the analog-to-digital converter and the storage module;
the second signal connector is connected with the first signal connector and is used for acquiring the development board sampling signal;
and the control module is used for outputting a control signal when a user selects a measured signal on the display module, controlling the analog switch to switch channels, and leading signals in the sampling signal path of the development board to the analog signal path.
Further, the signal measurement module further comprises a second power connector and a second signal connector;
the signal measurement module is connected with the first power connector of the development board through the second power connector;
the signal measurement module is connected with the first signal connector of the development board through the second signal connector.
Further, the signal measurement module further comprises a probe; a probe signal path is formed between the probe and the analog switch;
when the signal measurement module needs to be independently used, the probe is used for receiving an input measured signal;
when a user selects a measured signal in the probe signal path on the touch screen of the display module, the control module is used for outputting a control signal after receiving the selection request so as to control the analog switch to perform channel switching and guide the measured signal in the probe signal path to the analog signal path.
Further, the analog front end mainly comprises an attenuator and an amplifier, and is used for adjusting the sampling signal of the development board to a required amplitude and then inputting the sampling signal into the analog-to-digital converter;
the analog-to-digital converter is used for converting the sampling signal of the development board into a digital signal and sequentially inputting the digital signal into the storage module, the control module and the display module;
the display module is used for displaying the waveform of the received digital signal;
the trigger module is used for informing the control module through a trigger signal after the received signal waveform output by the analog front end meets a preset trigger event, and the control module is used for setting the occurrence time of the trigger event as the initial time and calculating the time of a sampling point after the trigger event, and finally displaying the time on a screen.
The invention discloses a circuit signal measuring method suitable for a development board, which is suitable for the circuit signal measuring system suitable for the development board, and comprises the following steps:
step 1: the user selects a required signal to be measured from a display screen of the display module; the signal to be measured is a driving signal of a main control chip control peripheral module or a signal directly input from a probe;
step 2: after receiving the selection of a user on the display screen, the control module outputs a control signal to control the analog switch to switch channels, and the measured signal is conducted to an analog signal path;
step 3: the analog front end sequentially transmits the measured signals in the analog signal path to the analog-to-digital converter, the storage module, the control module and the display module, and finally the waveform of the measured signals is displayed on the display module.
Further, the step 1 includes:
the user performs program development and debugging on the main control chip, and outputs a driving signal to drive the peripheral module; when a user needs to measure the driving signals on the development board, selecting signals in a sampling signal path of the development board on a touch screen of the display module;
when the signal measuring module needs to be used independently, the development board is separated from the signal measuring module in a power-off state, the signal measuring module is powered by using an independent power input, and signals in a probe signal path are selected on a touch screen of the display module.
Further, the step 3 includes:
the analog-to-digital converter samples the signal to be measured output by the analog front end, and converts the waveform of the sampled signal to be measured into a digital signal;
the storage module caches the digital signals;
the control module reads the digital signal data from the storage module according to the trigger signal, drives the display screen of the display module, and presents the waveform of the digital signal on the display screen.
Further, the method further comprises the following steps:
after the signal waveform input to the trigger module by the analog front end meets the preset trigger event, the trigger signal informs the control module, the control module sets the occurrence time of the trigger event as the initial time, calculates the time of the sampling point, and finally displays the time on the display module.
Due to the adoption of the technical scheme, the invention has the following advantages:
the invention can measure the key electronic signals on the development board without dismantling the development board acrylic glass board mask. The reliability of the development board is greatly improved and the service life of the development board is prolonged as the development board is not separated from the protection of the acrylic glass board.
The invention solves the problem of signal measurement of the development board of the user in the occasion without the oscilloscope. And the measurement signal option is prefabricated, and the key electronic signals can be selected for measurement through simple click, so that the development and measurement efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the embodiments of the present invention, and other drawings may be obtained according to these drawings for those skilled in the art.
Fig. 1 is a schematic diagram of a circuit signal measurement system suitable for a development board according to an embodiment of the invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein it is apparent that the examples described are only some, but not all, of the examples of the present invention. All other embodiments obtained by those skilled in the art are intended to fall within the scope of the embodiments of the present invention.
The signal in the present invention refers to an electronic signal, i.e. a voltage or current that varies with time. Either analog or digital. The electronic signal will be presented in the form of a waveform. The basic characteristics of the waveform include: amplitude, phase shift, period, frequency.
Waveform refers to the shape or image of a wave. The waveform may provide a lot of information about the signal, for example, it may tell you if the voltage is suddenly changed, linearly changed or kept unchanged.
Referring to fig. 1, the present invention provides an embodiment of a circuit signal measurement system suitable for use with a development board, which is comprised of two parts, a development board and a signal measurement module.
The two parts of circuits of the development board and the model measurement module are relatively independent and can be designed on the same circuit board; it is also possible to design 2 circuit boards separately and then connect them by connectors. The signal measuring module can be detached when designed as 2 circuit boards, and can also be used for testing and measuring signal waveforms of other electronic equipment after the signal measuring module is detached.
Development plate: the power supply circuit comprises a power supply input interface, a first power supply connector, a main control chip, peripheral equipment, a signal buffer and a first signal connector.
A power input interface: the power supply is used for accessing the power supply required by the development board and the signal measurement module.
A first power connector: for outputting power to the signal measurement module.
And (3) a main control chip: the main control chip can be MCU, ARM, FPGA, DSP, GPU and other chip types, and the main control chip controls the peripheral module through driving signals. In the present invention, the characteristics of the drive signal are: the number of signals, the waveform of the signals and the direction of the signals are determined according to the type of the peripheral equipment.
And (3) peripheral modules: functional modules controlled by the main control chip on the board, such as an LED lamp, a display screen, an HDMI transmitter, an audio chip and the like, are developed.
Signal buffer: for impedance transformation of the drive signal, the input signal is the drive signal of the peripheral module and the drive signal is the signal with the need for measurement. The output signal is a development board sampling signal, and is output to the signal measurement module through the first signal connector. The signal buffer is typically composed using a voltage follower, which has characteristics including:
the input impedance should be high, and the input pins should be located above the paths of the driving signals, so as to form no T-type network as much as possible, otherwise, the driving signals will be interfered, and the operation of the functions of the peripheral module will be affected.
Should have a low output impedance.
The voltage following range should completely contain the voltage fluctuation range of the input signal.
The bandwidth should be large enough to meet the measurement requirements.
A first signal connector: the development board up-sampling signal is output to the signal measurement module, and the first signal connector should be provided with the characteristics that: has small enough insertion loss.
The signal measuring module consists of a second power connector, a second signal connector, a probe input, an analog switch, an analog front end, a triggering module, an analog-to-digital conversion module, a storage module, a control module and a display module. The signal measurement module should be provided with features including: the waveform of the electronic signal input by the second signal connector can be measured, and the waveform of the electronic signal input by the probe can also be measured.
A second power connector: and the first power connector is connected with the development board, and the electric energy required by the operation of the signal measurement module is obtained from the development board.
A second signal connector: the first signal connector is connected with the first signal connector of the development board to acquire the sampling signal of the development board, and the second signal connector is required to be provided with the characteristics that: has small enough insertion loss.
Probe input: the physical form of the signal input of the measuring probe can adopt BNC and SMA, and the signal input is used for externally connecting the measuring probe.
Analog switch: the input development board sampling signal and the probe signal are input, and the output is an analog signal path. The characteristics that an analog switch should possess include:
the inputs are a development board sampling signal path and a probe signal path, the two paths containing one or more signals. The number of input signals supported by the analog switch should be equal to or greater than the sum of the above signals.
The analog switch is controlled by the control module to select a signal entering the analog front end.
The on-resistance should be as low as possible.
The voltage range of the analog signal that it allows to pass should fully encompass the voltage fluctuation range of the input signal.
Analog front end: the analog-digital conversion circuit mainly comprises an attenuator and an amplifier, and after the analog front end, signals are adjusted to proper amplitude and can be ideally subjected to analog-digital conversion by an analog-digital converter (ADC).
An analog-to-digital converter: the input signal is sampled and the input waveform is converted to a digital signal.
And a storage module: for buffering the digital signal data output by the analog-to-digital converter.
The triggering module is used for: when the waveform of the input signal meets a preset trigger event, the control module is informed by the trigger signal, the control module sets the occurrence time of the trigger event as the initial time to calculate the time of the next sampling point, and finally the time is displayed on the screen.
And the control module is used for: for the control of the whole measuring system, the following characteristics should be provided:
the switching of the access of the analog switch can be controlled according to the selection of a user on the touch screen;
reading digital signal data from the memory module according to the trigger signal;
and driving the display screen, and displaying the digital signal waveform on the display screen.
And a display module: the display and touch functions are provided, and the characteristics to be provided are as follows:
the device is used for displaying the waveform of the measured signal and has the conventional characteristics of an oscilloscope, such as trigger setting, voltage gain control, horizontal scanning time control and the like.
For GUI interaction with the user, the user can select the signal path to be tested through screen touch operation, and can select the signal in the sampling signal path of the development board or the signal of the probe signal path.
The invention provides an embodiment of a circuit signal measuring method suitable for a development board, which comprises the following specific implementation steps:
the driving signals to be measured, such as I2C signals, SPI signals, power signals, etc., of the peripheral module are determined when the development board is designed.
The circuit design and implementation are performed according to the scheme described in the present invention, so that the driving signals on the development board are introduced into the signal measurement module after passing through the signal buffer.
In the specific measurement, the development board and the signal measurement module are connected through a connector and electrified.
And the user performs program development and debugging on the main control chip and outputs a driving signal to drive the peripheral module.
When the user needs to measure the drive signal on the development board, the signals in the development board sampling signal path are selected on the touch screen of the display module. After receiving the request, the control module outputs a control signal to control the analog switch to switch the channel, and the signal in the signal path adopted by the development board is conducted to the analog signal path.
The driving signal on the development board passes through the signal buffer, the first signal connector, the analog switch and the analog front end; then converted to a digital signal via an analog-to-digital converter; and finally, the waveform is displayed on the display module through the storage module and the control module.
When the signal measurement module needs to be used independently, the development board is separated from the signal measurement module in a power-off state. The signal measurement module is powered using an independent power input.
Signals in the probe signal path are selected on a touch screen of the display module. After receiving the request, the control module outputs a control signal to control the analog switch to switch channels, and the signal in the probe signal path is conducted to the analog signal link.
The user uses the probe to access the tested signal, and the signal passes through the analog switch and the analog front end; then converted to a digital signal via an analog-to-digital converter; and finally, the waveform is displayed on the display module through the storage module and the control module.
The invention can measure the electronic signal on the development board and perform impedance transformation on the driving signal on the development board through the signal buffer. The control module controls the switching of the analog switch through the user selection of the touch screen, and can conveniently select the measured signal for measurement. Meanwhile, the signal measuring module is detachable, and when the signal measuring function is not needed, the module can be omitted, so that the hardware cost is reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The circuit signal measurement system suitable for the development board is characterized by comprising the development board and a signal measurement module; the development board is detachably connected with the signal measurement module and is relatively independent;
when the development board is electrically connected with the signal measurement module, the signal measurement module is used for measuring a measured signal generated by the development board;
when the signal measuring module is used alone, the signal measuring module is used for measuring the input measured signal.
2. The circuit signal measurement system of claim 1, wherein the development board is composed of a power input interface, a first power connector, a main control chip, a peripheral module, a signal buffer, and a first signal connector;
the main control chip is respectively connected with the peripheral module and the signal buffer; the signal buffer is connected with the signal measurement module through the first signal connector;
a power supply path is formed between the power supply input interface and the first power supply connector;
the main control chip is used for generating a driving signal to drive the peripheral module; wherein the driving signal is a measured signal;
the signal buffer is used for impedance transformation of the driving signal and outputting a development board sampling signal.
3. The system for measuring the circuit signals applicable to the development board according to claim 2, wherein the signal measuring module is composed of a second signal connector, an analog switch, an analog front end, a trigger module, an analog-to-digital conversion module, a storage module, a control module and a display module;
the second signal connector is connected with the analog front end through the analog switch; the analog front end is connected with the storage module through the analog converter; the storage module is connected with the display module through the control module; the analog front end is connected with the control module through the trigger module;
an analog signal path is formed between the analog switch and the analog front end; a digital signal path is formed between the analog-to-digital converter and the storage module;
the second signal connector is connected with the first signal connector and is used for acquiring the development board sampling signal;
and the control module is used for outputting a control signal when a user selects a measured signal on the display module, controlling the analog switch to switch channels, and leading signals in the sampling signal path of the development board to the analog signal path.
4. The circuit signal measurement system suitable for use in a development board of claim 3, wherein the signal measurement module further comprises a second power connector and a second signal connector;
the signal measurement module is connected with the first power connector of the development board through the second power connector;
the signal measurement module is connected with the first signal connector of the development board through the second signal connector.
5. The circuit signal measurement system adapted for use with a development board of claim 3, wherein the signal measurement module further comprises a probe; a probe signal path is formed between the probe and the analog switch;
when the signal measurement module needs to be independently used, the probe is used for receiving an input measured signal;
when a user selects a measured signal in the probe signal path on the touch screen of the display module, the control module is used for outputting a control signal after receiving the selection request so as to control the analog switch to perform channel switching and guide the measured signal in the probe signal path to the analog signal path.
6. The circuit signal measurement system suitable for use in a development board of claim 3 or 5,
the analog front end mainly comprises an attenuator and an amplifier and is used for adjusting the sampling signal of the development board to a required amplitude and then inputting the sampling signal into the analog-to-digital converter;
the analog-to-digital converter is used for converting the sampling signal of the development board into a digital signal and sequentially inputting the digital signal into the storage module, the control module and the display module;
the display module is used for displaying the waveform of the received digital signal;
the trigger module is used for informing the control module through a trigger signal after the received signal waveform output by the analog front end meets a preset trigger event, and the control module is used for setting the occurrence time of the trigger event as the initial time and calculating the time of a sampling point after the trigger event, and finally displaying the time on a screen.
7. A circuit signal measurement method suitable for use in a development board, suitable for use in a circuit signal measurement system suitable for use in a development board according to any one of claims 1 to 6, the method comprising the steps of:
step 1: the user selects a required signal to be measured from a display screen of the display module; the signal to be measured is a driving signal of a main control chip control peripheral module or a signal directly input from a probe;
step 2: after receiving the selection of a user on the display screen, the control module outputs a control signal to control the analog switch to switch channels, and the measured signal is conducted to an analog signal path;
step 3: the analog front end sequentially transmits the measured signals in the analog signal path to the analog-to-digital converter, the storage module, the control module and the display module, and finally the waveform of the measured signals is displayed on the display module.
8. The method according to claim 7, wherein the step 1 comprises:
the user performs program development and debugging on the main control chip, and outputs a driving signal to drive the peripheral module; when a user needs to measure the driving signals on the development board, selecting signals in a sampling signal path of the development board on a touch screen of the display module;
when the signal measuring module needs to be used independently, the development board is separated from the signal measuring module in a power-off state, the signal measuring module is powered by using an independent power input, and signals in a probe signal path are selected on a touch screen of the display module.
9. The method according to claim 7, wherein the step 3 comprises:
the analog-to-digital converter samples the signal to be measured output by the analog front end, and converts the waveform of the sampled signal to be measured into a digital signal;
the storage module caches the digital signals;
the control module reads the digital signal data from the storage module according to the trigger signal, drives the display screen of the display module, and presents the waveform of the digital signal on the display screen.
10. The method as recited in claim 7, further comprising:
after the signal waveform input to the trigger module by the analog front end meets the preset trigger event, the trigger signal informs the control module, the control module sets the occurrence time of the trigger event as the initial time, calculates the time of the sampling point, and finally displays the time on the display module.
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| CN202310381958.9A CN116449180A (en) | 2023-04-11 | 2023-04-11 | Circuit signal measurement system and method suitable for development board |
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| CN202310381958.9A CN116449180A (en) | 2023-04-11 | 2023-04-11 | Circuit signal measurement system and method suitable for development board |
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