CN220732847U

CN220732847U - Pin multiplexing circuit, device and converter

Info

Publication number: CN220732847U
Application number: CN202322390380.1U
Authority: CN
Inventors: 彭锦锟; 陈庆松
Original assignee: Huizhou Worui Technology Co ltd
Current assignee: Huizhou Worui Technology Co ltd
Priority date: 2023-09-04
Filing date: 2023-09-04
Publication date: 2024-04-05
Anticipated expiration: 2033-09-04

Abstract

The utility model discloses a pin multiplexing circuit, a pin multiplexing device and a pin multiplexing converter, which mainly comprise: an HDMI terminal circuit module, a signal line module and a conversion circuit module; the HDMI terminal circuit module is connected with one end of the signal wire module, the other end of the signal wire module is connected with one end of the conversion circuit module, and the other end of the conversion circuit module is connected with external debugging equipment; wherein the conversion circuit module at least comprises: the device comprises a level conversion circuit module, a serial interface circuit module, a debugging interface circuit module and a main control circuit module. According to the utility model, the idle pins on the HDMI terminal are utilized, and the connection is established between the signal wire and the plug interface and the conversion tool, so that the idle pins are multiplexed into the debugging interface, and then the debugging interface is connected with the external debugging equipment through the conversion tool, the off-machine debugging function of the machine is realized, the time and cost consumed by disassembling the machine are reduced, and the disassembly risk is avoided.

Description

Pin multiplexing circuit, device and converter

Technical Field

The present utility model relates to the field of pin multiplexing circuits, and in particular, to a pin multiplexing circuit, a pin multiplexing device, and a pin multiplexing converter.

Background

In the prior art, the HDMI port is an audio-video interface, through which high-definition uncompressed digital audio-video signals can be transmitted, and the main purpose of the HDMI port itself is to transmit audio-video signals, rather than being designed for debugging. However, when online debugging of an electronic product supporting HDMI functions is required, for example: the receiving of Log information, the sending of commands, the burning of programs, etc. are generally performed on a PCBA in an electronic product. When the electronic product with complete structure needs to be debugged, the electronic product needs to be disassembled and then can be debugged on the PCBA. Then, a certain time cost is often generated in the process of disassembling the machine, and other mechanical damage risks also.

Disclosure of Invention

To the defect of above-mentioned prior art, this application provides a pin multiplexing circuit, device and converter, mainly through utilizing idle pin on the HDMI terminal to establish the connection between signal line and plug interface and the changeover tool, realized multiplexing idle pin into the debugging interface, the rethread changeover tool is connected with external debugging equipment, has realized the off-the-shelf debugging function of machine, reduces time and the cost that dismouting machine consumed, has still avoided the dismouting risk.

To achieve the above object, the present application provides a pin multiplexing circuit, including:

HDMI terminal circuit module, signal line module and conversion circuit module.

The HDMI terminal circuit module is connected with one end of the signal wire module, the other end of the signal wire module is connected with one end of the conversion circuit module, and the other end of the conversion circuit module is connected with external debugging equipment.

Wherein the conversion circuit module at least comprises: the device comprises a level conversion circuit module, a serial interface circuit module, a debugging interface circuit module and a main control circuit module.

In this application, idle pin in HDMI terminal circuit module is connected with the first plug interface module of signal line module one end, and the signal line module other end with the one end of converting circuit module is connected.

Optionally, an idle pin in the HDMI terminal circuit module is connected to a second plug interface module at one end of the signal line module, and a second plug module at the other end of the signal line module is connected to a second socket module at one end of the conversion circuit module.

In the application, the plug interface module can provide simple disassembly and insertion, and is convenient for debugging and connection; the plug interface module can be directly welded without being arranged, and the direct welding mode can reduce the cost more, but is not convenient to detach and replace.

Further, the output end of the level conversion circuit module is connected with the input end of the serial interface circuit module, the output end of the serial interface circuit module is connected with the main control circuit module, and the main control circuit module is also connected with the debugging interface circuit module.

In the application, if the external debugging equipment is a PC, a conversion circuit with a USB interface is required to be provided; if stable working voltage is required to be provided for the circuit, a power supply conversion circuit module can be additionally arranged; if the internal circuit needs to be protected, the anti-interference capability is improved, and an isolation protection circuit module can be additionally arranged.

That is, the conversion circuit module may further include a USB interface circuit module, a power conversion circuit module, an isolation protection circuit module, and the like.

In order to achieve the above object, the present application further provides a pin multiplexing device, including:

HDMI terminal module, signal line module and conversion module.

The HDMI terminal module is connected with one end of the signal wire module, the other end of the signal wire module is connected with one end of the conversion module, and the other end of the conversion module is connected with external debugging equipment.

Wherein, the conversion module includes at least: the system comprises a level conversion module, a serial interface module, a debugging interface module and a main control module.

In this application, idle pin in the HDMI terminal module is connected with the first plug interface module of signal line module one end, and the signal line module other end with conversion module's one end is connected.

Optionally, an idle pin in the HDMI terminal module is connected to a second plug interface module at one end of the signal line module, and a second plug module at the other end of the signal line module is connected to a second socket module at one end of the conversion module.

Further, the output end of the level conversion module is connected with the input end of the serial interface module, the output end of the serial interface module is connected with the main control module, and the main control module is also connected with the debugging interface module.

To achieve the above object, the present application further provides a converter, including at least:

the system comprises a level conversion module, a serial interface module, a debugging interface module and a main control module.

The output end of the level conversion module is connected with the input end of the serial interface module, the output end of the serial interface module is connected with the main control module, and the main control module is also connected with the debugging interface module.

Compared with the prior art, the application has the beneficial effects that:

according to the pin multiplexing circuit, the pin multiplexing device and the pin multiplexing converter, the idle pins on the HDMI terminal are mainly utilized, connection is established between the signal wire and the plug interface and the conversion tool, the idle pins are multiplexed into the debugging interface, and then the conversion tool is connected with the external debugging equipment, so that the off-board debugging function of the machine is realized, the time and cost consumed by disassembling the machine are reduced, and the disassembling risk is avoided.

Drawings

Fig. 1 is a schematic diagram of a pin multiplexing circuit according to the present utility model.

Fig. 2 is a schematic diagram of another pin multiplexing circuit according to the present utility model.

Fig. 3 is a schematic diagram of a converter according to the present utility model.

Detailed Description

For the purposes, technical solutions and advantages of the embodiments of the present application to be more apparent, the technical solutions will be clearly and completely described below in connection with the embodiments of the present application. It will be apparent that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Embodiment one:

as shown in fig. 1, to solve the above-mentioned problems, the present utility model provides a pin multiplexing circuit, which includes:

HDMI terminal circuit module, signal line module and conversion circuit module.

Preferably, the HDMI terminal circuit module at least includes an HDMI terminal, and the HDMI terminal has 19 pins, some of which are spare or reserved pins, and when the HDMI terminal has free pins in normal operation, it can be determined which pins of the HDMI terminal are free, and the HDMI terminal is used for extracting a debug signal line, where each free pin can extract a signal line.

Preferably, the free PINs of the HDMI terminal are corresponding to the corresponding debug signal lines, such as PIN14 being defined as uart_tx and PIN17 being defined as uart_rx, without being limited thereto.

In the application, the idle pins of the HDMI terminal are led out and used as a first plug to be connected with a first plug interface module at one end of the signal line module, the first plug interface module can adopt a 4-pin plug interface with the model of W/HOUSING header4-2.0, and the W represents that the pin spacing is 2.54mm, namely the standard 0.1 inch spacing. HOUSING indicates that the plug has a plastic HOUSING that protects the pins from bending or breaking. header4 indicates that this is a 4 pin female plug. 2.0 Indicating that the diameter of the pin is 2.0mm. Such plugs are commonly used on motherboard or expansion boards for connecting various accessories or expansion modules. Common interface standards are GPIO, I2C, SPI, etc.

Further, if the free pins are insufficient, plugs with more pins, such as 8×1 header8-2.0, are also contemplated, and are not limited thereto.

Preferably, assuming PIN14 is defined as uart_tx and PIN17 is defined as uart_rx, then the connection is made using the corresponding signal line. The signal line at least needs to include the following:

UART transmit line (TXD): for sending logs or other debug information, at least 1 TXD line is required.

UART receive line (RXD): for receiving commands or burning data, at least 1 RXD line is required.

Burn data line (SWD/JTAG): at least 2 lines are required for transmitting the timing signals required for programming.

Reset line: the method is used for resetting the MCU, is convenient to debug, and is at least 1.

A power line: and providing at least 1 working power supply for the conversion plate.

A grounding wire: ensure signal stability, at least 1.

Therefore, the signal lines may be set to 1 TXD, 1 RXD, 2 SWD/JTAG, 1 RESET, 1 VCC, 1 GND, all without limitation.

That is, a minimum of 7 signal lines are required to basically implement the debug functions of log output, command input, and program burn-in. Furthermore, if other signals need to be extended, the number of idle pins may be increased.

As shown in fig. 2, optionally, the idle pin in the HDMI terminal circuit module is connected to a second plug interface module at one end of the signal line module, and the second plug module at the other end of the signal line module is connected to a second socket module at one end of the conversion circuit module.

Optionally, the level conversion circuit module is configured to convert the level of the HDMI terminal into a level required by the external debug device, such as a TTL level, an LVDS level, and the like; the serial interface circuit module is used for realizing serial interfaces such as UART, SPI and the like required by external debugging equipment; the JTAG/SWD interface circuit module is used for realizing JTAG or SWD debugging interfaces for program burning; the MCU circuit module is used for processing the conversion between different signal protocols and levels.

In this application, a second socket with 4 pins may be correspondingly disposed on the HDMI conversion circuit module, and used for connection with the 4*1 second plug module at the other end of the signal line module.

Further, the conversion tool interior connects the 4 pins to the corresponding functional circuits. For example, pin1 is connected to UART transmit circuitry and pin 2 is connected to UART receive circuitry. By plug connection, the free pins of the HDMI terminal can be corresponded to the functional circuits of the conversion tool.

If the external debugging device is a PC end, the PC end passes through a corresponding interface of a conversion tool, such as: UART, debugging can be implemented using these 2 HDMI idle pins.

In the application, if the external debugging equipment is a PC end, a conversion circuit of a USB interface is required to be provided; if stable working voltage is required to be provided for the circuit, a power supply conversion circuit module can be additionally arranged; if the internal circuit needs to be protected, the anti-interference capability is improved, and an isolation protection circuit module can be additionally arranged.

In summary, the pin multiplexing circuit of the utility model realizes multiplexing the idle pins into the debugging interface, and then is connected with the external debugging equipment through the conversion tool, thereby realizing the off-machine debugging function of the machine, avoiding the off-machine debugging in the disassembly and assembly steps of the machine to be debugged, reducing the time and cost consumed by disassembly and assembly of the machine and improving the utilization rate of resources.

Embodiment two:

in order to solve the above problem, the present application further provides a pin multiplexing device, including:

HDMI terminal module, signal line module and conversion module.

Preferably, the pin multiplexing device is applied to all electronic products supporting the HDMI terminal, and is not limited thereto.

Preferably, the HDMI terminal module: the free pins 19, 20 are brought out to a 2.54mm pin header using an HDMI interface expansion board.

A signal line module: and one end of the DuPont wire is provided with a male pin and a female pin, and the male pin and the female pin can be connected with the HDMI in a pluggable manner.

And a conversion module: and a level conversion module: MAX3232 for implementing HDMI to TTL level conversion.

Serial interface module: UART transceiver in MAX 3232.

And the main control module: and the STM32 singlechip is used for processing the UART signal.

And a debugging interface module: SWD debug interface of STM 32.

USB interface circuit module: FT232RL.

And (3) interface connection: the pin header is used to connect with HDMI interface, and the USB is connected with PC.

The working flow is as follows: the signal of the HDMI idle pin enters STM32 after level conversion; STM32 communicates with the PC via a USB serial port and can be debugged via SWD.

In summary, the pin multiplexing device of the present utility model is a device for practical application of the pin multiplexing circuit in the first embodiment, and in principle, the method can be seen from the first embodiment, and the conversion device is assembled by the ready-made module, so that not only is the conversion from HDMI to UART realized, but also the SWD debugging interface is reserved, and the debugging requirement is met. The modules are connected with the DuPont line through the pin headers, thereby being convenient and quick.

Embodiment III:

as shown in fig. 3, to solve the above problem, the present application further provides a converter, which at least includes:

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solution of the present utility model, and not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or some of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A pin multiplexing circuit, comprising:

an HDMI terminal circuit module, a signal line module and a conversion circuit module;

the HDMI terminal circuit module is connected with one end of the signal wire module, the other end of the signal wire module is connected with one end of the conversion circuit module, and the other end of the conversion circuit module is connected with external debugging equipment;

2. A pin multiplexing circuit as described in claim 1, wherein,

and an idle pin in the HDMI terminal circuit module is connected with a first plug interface module at one end of a signal wire module, and the other end of the signal wire module is connected with one end of the conversion circuit module.

3. A pin multiplexing circuit as described in claim 1, wherein,

and the idle pin in the HDMI terminal circuit module is connected with a second plug interface module at one end of the signal wire module, and the second plug module at the other end of the signal wire module is connected with a second socket module at one end of the conversion circuit module.

4. A pin multiplexing circuit as defined in claim 2 or claim 3, wherein,

the output end of the level conversion circuit module is connected with the input end of the serial interface circuit module, the output end of the serial interface circuit module is connected with the main control circuit module, and the main control circuit module is also connected with the debugging interface circuit module.

5. A pin multiplexing device, wherein the device at least comprises a pin multiplexing circuit according to any one of claims 1 to 4.

6. A converter, comprising at least:

the system comprises a level conversion module, a serial interface module, a debugging interface module and a main control module;