CN112463482A - Serial port debugging method, circuit and module based on HDMI interface - Google Patents
Serial port debugging method, circuit and module based on HDMI interface Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
- G06F11/221—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test buses, lines or interfaces, e.g. stuck-at or open line faults
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
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Abstract
The invention provides a serial port debugging method, a serial port debugging circuit and a serial port debugging module based on an HDMI (high-definition multimedia interface), wherein the serial port debugging circuit is provided with a first IO port, a second IO port, a third IO port, a fourth IO port, a fifth IO port and a sixth IO port; the first IO port is connected to a first grounding pin of the HDMI, the second IO port is connected to a second grounding pin of the HDMI, and the third IO port and the fourth IO port are used as debugging ports; and the fifth IO port and the sixth IO port are connected with a debugging port of the main chip. The invention solves the debugging problem of the circuit only with the HDMI terminal with extremely low cost. The HDMI signal and the debugging function can be used simultaneously, and user experience is improved. And simultaneously, the problem of compatibility caused by the compatibility of UART functions is solved.
Description
Technical Field
The invention relates to the technical field of debugging circuits of all-in-one machine equipment, in particular to a serial port debugging method, a serial port debugging circuit and a serial port debugging module based on an HDMI (high-definition multimedia interface).
Background
Due to the development of the technology, at present, more and more display devices support high-definition HDMI interfaces, and VGA interfaces are gradually eliminated. However, due to the chip design of the display device, the debug interface of the chip is generally integrated on the DDC channel of the VGA interface. After the VGA interface is cancelled, no method is available for debugging chip parameters through a debugging tool outside. Therefore, when the product is assembled into a complete machine, if problems occur and debugging is needed, only complete machine equipment can be disassembled. The workload and the investment cost may be relatively small if only one device is used. However, when a large amount of devices have problems and need to debug chips, high time cost and labor cost are incurred if disassembly is required. Based on the above problems, the existing solutions: the debugging signal RX/TX and the DDC signal of the HDMI are switched through a triode circuit on a DDC channel of the HDMI. When the debug function is used, the HDMI signal cannot be used, and when the HDMI signal is used, the debug function cannot be used. If the abnormality related to the HDMI occurs, the HDMI display picture needs to be debugged at the same time, and the prior art cannot realize the abnormality.
Disclosure of Invention
The invention aims to provide a serial port debugging method, a serial port debugging circuit and a serial port debugging module based on an HDMI (high-definition multimedia interface), which can solve the problem that the debugging function and an HDMI signal cannot be simultaneously carried out in the prior art.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the invention provides a serial port debugging circuit based on an HDMI interface, which has a first IO port, a second IO port, a third IO port, a fourth IO port, a fifth IO port and a sixth IO port; the first IO port is connected to a first grounding pin of the HDMI, the second IO port is connected to a second grounding pin of the HDMI, and the third IO port and the fourth IO port are used as debugging ports; the fifth IO port and the sixth IO port are respectively connected with a debugging pin of the main chip;
the serial port debugging circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7; one end of the resistor R1 and one end of the resistor R3 are respectively connected with the first IO port; one end of the resistor R4 is connected with a second IO port; the other end of the resistor R1 and the other end of the resistor R2 are connected with direct-current voltage; one end of the resistor R2 and the other end of the resistor R4 are connected with the sixth IO port; the resistor R3 is connected with the resistor R5 in series and then connected with the fifth IO port; one end of the resistor R6 is connected with the sixth IO port, and the other end is connected with the third IO port; one end of the resistor R7 is connected with the fifth IO port, and the other end is connected with the third IO port.
Furthermore, another serial port debugging circuit based on the HDMI interface further comprises a UART switching circuit, which comprises a resistor R8, a resistor R9, a resistor R10, a triode QH1, a MOS transistor QH2 and a MOS transistor QH 3; one end of the resistor R8 and one end of the resistor R9 are connected to the main chip pin UART _ select; the other end of the resistor R8 and one end of the resistor R10 are connected with direct-current voltage; the other end of the resistor R9 is connected with the base electrode of the triode QH1, the other end of the resistor R10 is connected with the collector electrode of the triode QH1, and the emitter electrode of the triode QH1 is grounded; the grid electrode of the MOS tube QH2 and the grid electrode of the MOS tube QH3 are connected with the collector electrode of the triode QH 1; the source electrode of the MOS tube QH2 and the source electrode of the MOS tube QH3 are grounded; the drain of the MOS tube QH2 is connected to the second ground pin of the HDMI terminal, and the drain of the MOS tube QH3 is connected to the first ground pin of the HDMI terminal.
In a second aspect, the invention provides a serial port debugging module based on an HDMI interface, which comprises an HDMI male head, an HDMI female seat, a debugging socket and a board card; the HDMI male head is arranged at one end of the board card, and the HDMI female seat and the debugging socket are arranged at the other end of the board card;
the board card is printed with the first serial port debugging circuit; a first IO port of the serial port debugging circuit is connected to the 2 nd pin of the HDMI male head, a second IO port of the serial port debugging circuit is connected to the 17 th pin of the HDMI male head, a fifth IO port of the serial port debugging circuit is connected to the 2 nd pin of the HDMI female seat, and a sixth IO port of the serial port debugging circuit is connected to the 17 th pin of the HDMI female seat; and a third IO port of the serial port debugging circuit is connected to the 2 nd pin of the debugging socket, and a fourth IO port of the serial port debugging circuit is connected to the 3 rd pin of the debugging socket.
In a third aspect, the invention provides a serial port debugging module based on an HDMI interface, which is characterized by comprising an HDMI male head, an HDMI female seat, a debugging socket and a board card; the HDMI male head is arranged at one end of the board card, and the HDMI female seat and the debugging socket are arranged at the other end of the board card;
the board card is printed with the other serial port debugging circuit; a first IO port of the serial port debugging circuit and a drain electrode of an MOS tube QH3 of the UART switching circuit are connected to a 2 nd pin of the HDMI male head, a second IO port of the serial port debugging circuit and a drain electrode of an MOS tube QH2 of the UART switching circuit are connected to a 17 th pin of the HDMI male head, a fifth IO port of the serial port debugging circuit is connected to a 2 nd pin of the HDMI female seat, and a sixth IO port of the serial port debugging circuit is connected to a 17 th pin of the HDMI female seat; and a third IO port of the serial port debugging circuit is connected to the 2 nd pin of the debugging socket, and a fourth IO port of the serial port debugging circuit is connected to the 3 rd pin of the debugging socket.
Furthermore, the pins of the HDMI male connector except the 2 nd pin and the 17 th pin are connected with the pins of the HDMI female socket except the 2 nd pin and the 17 th pin in a one-to-one correspondence application lead.
Furthermore, the 1 st pin of the debugging socket is connected with +5V voltage, and the 4 th pin is grounded.
In a third aspect, the invention provides a serial port debugging method based on an HDMI interface, which is realized based on the other serial port debugging circuit, in the starting process of the all-in-one machine and in a set time period after starting, a main chip pin UART _ select is set to be at a high level, an MOS tube QH2 and an MOS tube QH3 are disconnected, and the No. 2 pin and No. 17 pin of an HDMI terminal are not connected with the ground; when the power-on exceeds a set time period, setting a main chip pin UART _ select to be at a low level, and conducting a MOS tube QH2 and a MOS tube QH3 to enable a pin2 and a pin17 of the HDMI terminal to be grounded; at the time of debugging, the main chip pin UART _ select is kept high all the time for a period of debugging.
The serial port debugging method, the serial port debugging circuit and the serial port debugging module based on the HDMI solve the problem of debugging the circuit only by using the HDMI terminal at extremely low cost. The HDMI signal and the debugging function can be used simultaneously, and user experience is improved. And simultaneously, the problem of compatibility caused by the compatibility of UART functions is solved.
Drawings
FIG. 1 is a schematic circuit diagram of a serial port debug circuit of the present invention;
FIG. 2 is a schematic circuit diagram of the UART switch circuit of the present invention;
FIG. 3 is a pin diagram of a standard HDMI terminal;
fig. 4 is a block diagram of a serial port debugging module of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
As shown in fig. 1, the serial port debugging circuit based on the HDMI interface of the present invention includes a first IO port (i/o port), a second IO port, a third IO port, a fourth IO port, a fifth IO port, and a sixth IO port. A first IO port of the serial port debugging circuit is connected to a 2 nd pin of an HDMI terminal of the all-in-one machine, a second IO port is connected to a 17 th pin of the HDMI terminal of the all-in-one machine, and a third IO port and a fourth IO port serve as debugging ports and output debugging signals UART _ TX and UART _ RX. The fifth IO port and the sixth IO port are respectively connected with a debugging pin UART _ select of the main chip. The serial port debugging circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7. One end of the resistor R1 and one end of the resistor R3 are respectively connected to a first IO port of the serial port debugging circuit. One end of the resistor R4 is connected to the second IO port of the serial port debugging circuit. The other end of the resistor R1 and the other end of the resistor R2 are connected to a voltage of + 3.3V. One end of the resistor R2 and the other end of the resistor R4 are connected to a sixth IO port of the serial port debugging circuit. And the resistor R3 is connected with the resistor R5 in series and then connected to a fifth IO port of the serial port debugging circuit. One end of the resistor R6 is connected with the sixth IO port of the serial port debugging circuit, and the other end is connected with the third IO port of the serial port debugging circuit. One end of the resistor R7 is connected with the fifth IO port of the serial port debugging circuit, and the other end is connected with the third IO port of the serial port debugging circuit. The 2 nd pin of the HDMI terminal and the 17 th pin of the HDMI terminal are grounding pins.
The operating principle of the circuit schematic shown in fig. 1 is: the resistors R1 and R2 are pull-up resistors for the debug signals UART1_ RXD/VGA _ SCL and UART1_ TXD/VGA _ SDA, providing high level driving. The resistor R6 and the resistor R7 are protection resistors, and prevent UART1_ RXD/VGA _ SCL and UART1_ TXD/VGA _ SDA signals led out of the chip from being directly connected with the outside through the UART _ RX and UART _ TX. The resistor R3, the resistor R5 and the resistor R4 serve as protection resistors of the circuit, and on the other hand, when the HDMI PIN2 PIN is grounded due to the connection of the HDMI signal source, the levels of the UARTs 1_ RXD/VGA _ SCL and the UARTs 1_ TXD/VGA _ SDA are not affected by the HDMI interfaces HDMI-PIN2 and HDMI-PIN17 due to the current limiting effects of the resistor R3, the resistor R5 and the resistor R4. In this way, the signals received from UART _ RX and UART _ TX are not affected and can still be debugged normally.
In the circuit shown in fig. 1, the debug signal UART _ RX is mainly connected to pin2 of the HDMI terminal, and the debug signal UART _ TX is connected to pin17 of the HDMI terminal. In the standard definition, pins 2 and 17 of the HDMI terminal are ground. Since the 2 nd, 5 th, 8 th, 11 th, 17 th pins of the HDMI terminal, including the shell, are all ground signals, removing both ground pins has no effect on the signals.
Preferably, the serial port debugging circuit based on the HDMI interface further includes a UART switching circuit, and the purpose of adding the UART switching circuit is as follows: in consideration of the irregularity of the HDMI wires on the market, in order to prevent the problem of lack of HDMI wire ground wires due to cost saving, a UART switching circuit is added. The circuit schematic diagram of the UART switching circuit is shown in fig. 2. The circuit comprises a resistor R8, a resistor R9, a resistor R10, a triode QH1, a MOS tube QH2 and a MOS tube QH 3; one end of the resistor R8 is connected to one end of the resistor R9 and connected to the UART _ select pin of the main chip. The other end of the resistor R8 is connected to one end of the resistor R10 at + 3.3V. The other end of the resistor R9 is connected with the base electrode of the triode QH1, the other end of the resistor R10 is connected with the collector electrode of the triode QH1, and the emitting electrode of the triode QH1 is grounded. The gate of the MOS transistor QH2 and the gate of the MOS transistor QH3 are connected with the collector of the triode QH 1. The source of the MOS transistor QH2 and the source of the MOS transistor QH3 are grounded. The drain of the MOS transistor QH2 is connected to the 17 th pin of the HDMI terminal, and the drain of the MOS transistor QH3 is connected to the 2 nd pin of the HDMI terminal.
The working principle of fig. 2 is: the main chip pin UART _ select is used for controlling MOS transistors QH2 and QH3 through a triode QH1, and during the boot process and in a period of time after the boot process, the UART _ select is in a high level and controls QH2 and QH3 to be disconnected and not connected with the ground. At this time, the UART function on the HDMI port can be used normally, after the HDMI is turned on for a period of time, the software default setting UART _ select becomes low, and the two MOS transistors QH2 and QH3 are turned on, so that the 2 nd pin and the 17 th pin of the HDMI terminal are grounded. Thus, even if the HDMI wire is lack of the ground wire, normal use is not affected. During debugging, the UART _ select needs to be kept high all the time through a UART command within the time set by software, so that the HDMI function and the debugging function can be used simultaneously during debugging, and pins are defined by standard HDMI when a terminal client only uses the HDMI function.
The HDMI terminal simultaneously uses HDMI signals and a debugging function, and in order to make the serial port debugging circuit more convenient to use, the serial port debugging module based on the HDMI interface is generated, as shown in fig. 4, and comprises an HDMI male connector CONH2, an HDMI female socket CONH3, a debugging socket CONL1, and a board card. The public head of HDMI sets up the one end at the integrated circuit board, and female seat of HDMI and debugging socket set up the other end at the integrated circuit board. The board card is printed with the serial port debugging circuit. The first IO port of the serial port debugging circuit is connected to the 2 nd pin of the HDMI male head, the second IO port of the serial port debugging circuit is connected to the 17 th pin of the HDMI male head, the fifth IO port of the serial port debugging circuit is connected to the 2 nd pin of the HDMI female socket, and the sixth IO port of the serial port debugging circuit is connected to the 17 th pin of the HDMI female socket. And a third IO port of the serial port debugging circuit is connected to the 2 nd pin of the debugging socket, and a fourth IO port of the serial port debugging circuit is connected to the 3 rd pin of the debugging socket. The other pins of the HDMI male connector except the 2 nd pin and the 17 th pin are connected with the other pins of the HDMI female socket except the 2 nd pin and the 17 th pin in a one-to-one correspondence application lead. For example, the 1 st pin of the HDMI male connector is connected to the 1 st pin of the HDMI female connector through a lead, the 3 rd pin of the HDMI male connector is connected to the 3 rd pin of the HDMI female connector through a lead, and so on, which are not repeated again. The 1 st pin of the debugging socket is connected with +5V voltage, and the 4 th pin is grounded.
During normal use, the HDMI interface of all-in-one is connected to the public head of HDMI of serial ports debugging module, and female seat of HDMI is unanimous with the HDMI terminal. Meanwhile, the debugging UART is connected, and as the 2 nd pin and the 17 th pin of the HDMI male socket are not directly connected with the 2 nd pin and the ground 4 th pin of the HDMI female socket, the middle part of the HDMI male socket is also connected with a serial port debugging circuit in series without being directly connected to a signal source, the HDMI male socket and the HDMI female socket can be used simultaneously without being influenced.
The debugging socket is the interface that directly connects the debugging instrument on the integrated circuit board for the automatic test of conventional debugging and mill is used for, and the effect of resistance R3, R4 is more crucial in the circuit, can play the effect of isolation, guarantees that HDMI terminal 2 nd foot and 3 rd foot after equipment termination has the signal, and the voltage can not be drawn low, and the debugging function of debugging socket CONL1 is still normal like this.
The serial port debugging method based on the HDMI is realized by using the serial port debugging circuit with the UART switching circuit. During the boot process of the device and in a set time period after the boot, the main chip pin UART _ select is set to be at a high level, the MOS tube QH2 and the MOS tube QH3 are disconnected, and the No. 2 pin and the No. 17 pin of the HDMI terminal are not connected with the ground. At this time, the UART function on the HDMI port can be normally used. When the power-on exceeds the set time period, the UART _ select is set to be low, the MOS tube QH2 and the MOS tube QH3 are conducted, and the 2 nd pin and the 17 th pin of the HDMI terminal are grounded. Thus, even if the HDMI wire is lack of the ground wire, normal use is not affected. During debugging, it is necessary to keep UART _ select high through UART command all the time during the debugging time. In this way, the HDMI function and the debug function can be used simultaneously at the time of debugging.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (7)
1. The serial port debugging circuit based on the HDMI is characterized by comprising a first IO port, a second IO port, a third IO port, a fourth IO port, a fifth IO port and a sixth IO port; the first IO port is connected to a first grounding pin of the HDMI, the second IO port is connected to a second grounding pin of the HDMI, and the third IO port and the fourth IO port are used as debugging ports; the fifth IO port and the sixth IO port are respectively connected with a debugging pin of the main chip;
the serial port debugging circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7; one end of the resistor R1 and one end of the resistor R3 are respectively connected with the first IO port; one end of the resistor R4 is connected with a second IO port; the other end of the resistor R1 and the other end of the resistor R2 are connected with direct-current voltage; one end of the resistor R2 and the other end of the resistor R4 are connected with the sixth IO port; the resistor R3 is connected with the resistor R5 in series and then connected with the fifth IO port; one end of the resistor R6 is connected with the sixth IO port, and the other end is connected with the third IO port; one end of the resistor R7 is connected with the fifth IO port, and the other end is connected with the third IO port.
2. The HDMI interface-based serial port debugging circuit of claim 1, further comprising a UART switching circuit, wherein the UART switching circuit comprises a resistor R8, a resistor R9, a resistor R10, a transistor QH1, a MOS transistor QH2 and a MOS transistor QH 3; one end of the resistor R8 and one end of the resistor R9 are connected to the main chip pin UART _ select; the other end of the resistor R8 and one end of the resistor R10 are connected with direct-current voltage; the other end of the resistor R9 is connected with the base electrode of the triode QH1, the other end of the resistor R10 is connected with the collector electrode of the triode QH1, and the emitter electrode of the triode QH1 is grounded; the grid electrode of the MOS tube QH2 and the grid electrode of the MOS tube QH3 are connected with the collector electrode of the triode QH 1; the source electrode of the MOS tube QH2 and the source electrode of the MOS tube QH3 are grounded; the drain of the MOS tube QH2 is connected to the second ground pin of the HDMI terminal, and the drain of the MOS tube QH3 is connected to the first ground pin of the HDMI terminal.
3. The serial port debugging module based on the HDMI interface is characterized by comprising an HDMI male head, an HDMI female seat, a debugging socket and a board card; the HDMI male head is arranged at one end of the board card, and the HDMI female seat and the debugging socket are arranged at the other end of the board card;
the board card is printed with the serial port debugging circuit of claim 1; a first IO port of the serial port debugging circuit is connected to the 2 nd pin of the HDMI male head, a second IO port of the serial port debugging circuit is connected to the 17 th pin of the HDMI male head, a fifth IO port of the serial port debugging circuit is connected to the 2 nd pin of the HDMI female seat, and a sixth IO port of the serial port debugging circuit is connected to the 17 th pin of the HDMI female seat; and a third IO port of the serial port debugging circuit is connected to the 2 nd pin of the debugging socket, and a fourth IO port of the serial port debugging circuit is connected to the 3 rd pin of the debugging socket.
4. The serial port debugging module based on the HDMI interface is characterized by comprising an HDMI male head, an HDMI female seat, a debugging socket and a board card; the HDMI male head is arranged at one end of the board card, and the HDMI female seat and the debugging socket are arranged at the other end of the board card;
the board card is printed with the serial port debugging circuit of claim 2; a first IO port of the serial port debugging circuit and a drain electrode of an MOS tube QH3 of the UART switching circuit are connected to a 2 nd pin of the HDMI male head, a second IO port of the serial port debugging circuit and a drain electrode of an MOS tube QH2 of the UART switching circuit are connected to a 17 th pin of the HDMI male head, a fifth IO port of the serial port debugging circuit is connected to a 2 nd pin of the HDMI female seat, and a sixth IO port of the serial port debugging circuit is connected to a 17 th pin of the HDMI female seat; and a third IO port of the serial port debugging circuit is connected to the 2 nd pin of the debugging socket, and a fourth IO port of the serial port debugging circuit is connected to the 3 rd pin of the debugging socket.
5. The serial port debugging module based on the HDMI interface of claim 3 or 4, wherein the pins of the HDMI male connector except the 2 nd pin and the 17 th pin are connected with the pins of the HDMI female socket except the 2 nd pin and the 17 th pin by one-to-one application lead.
6. The serial port debugging module based on HDMI interface of claim 3 or 4, wherein the 1 st pin of said debugging socket is connected to +5V voltage, and the 4 th pin is connected to ground.
7. A serial port debugging method based on an HDMI interface is characterized in that based on the serial port debugging circuit implementation of claim 2, in the starting process of an all-in-one machine and in the set time period after starting, a debugging selection control pin of a main chip is set to be at a high level, an MOS tube QH2 and an MOS tube QH3 are disconnected, and the No. 2 pin and No. 17 pin of an HDMI terminal are not connected with the ground; when the starting is over the set time period, setting the debugging selection control pin of the main chip to be at a low level, and conducting the MOS tube QH2 and the MOS tube QH3 to enable the No. 2 pin and the No. 17 pin of the HDMI terminal to be grounded; and during debugging, keeping the debugging selection control pin of the main chip at a high level all the time in a debugging time period.
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| CN113253017A (en) * | 2021-04-16 | 2021-08-13 | 广州朗国电子科技有限公司 | Electrical performance test module of HDMI port |
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| CN211180806U (en) * | 2020-02-24 | 2020-08-04 | 深圳创维－Rgb电子有限公司 | Debugging serial port circuit based on HDMI interface, HDMI interface module and HDMI equipment |
| CN112073658A (en) * | 2020-07-30 | 2020-12-11 | 广州朗国电子科技有限公司 | Screen segmentation display method and device for all-in-one conference machine, storage medium and all-in-one conference machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253017A (en) * | 2021-04-16 | 2021-08-13 | 广州朗国电子科技有限公司 | Electrical performance test module of HDMI port |
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