CN216434919U - Debugging circuit based on HDMI interface and HDMI interface device - Google Patents
Debugging circuit based on HDMI interface and HDMI interface device Download PDFInfo
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Abstract
The utility model discloses a debugging circuit and HDMI interface equipment based on HDMI interface, wherein, the debugging circuit based on HDMI interface is connected with HDMI interface and control chip, and it includes: the switching module and the level conversion module; the switching module is respectively connected with the HDMI interface and the level conversion module and is used for outputting a detection signal to switch serial port communication and HDMI communication or switch I2C communication and HDMI communication; and the level conversion module is respectively connected with the switching module, the HDMI interface and the control chip and is used for finishing the transmission of signal levels according to the detection signals so as to realize serial port communication and I2C communication. The utility model discloses serial port communication function and I2C communication function have been realized simultaneously in the serial port debugging scheme of HDMI interface.
Description
Technical Field
The utility model relates to a HDMI equipment serial ports debugging technical field especially relates to a debugging circuit and HDMI interface device based on HDMI interface.
Background
With the popularization of information products, multimedia data audio-video interfaces such as a USB interface and an HDMI interface are visible everywhere, and become standard interfaces of electronic products due to the universality. It is common, in order to save port quantity, provide complete machine product software debugging convenience simultaneously, need multiplex the design to general port, debug electronic product under the state of not tearing open the shell to improve production efficiency and product debugging efficiency.
At present, a serial port debugging scheme based on an HDMI (high-definition multimedia interface) appears in the software debugging of television products, but the current serial port debugging scheme based on the HDMI cannot simultaneously realize the serial port communication function and the I2C communication function.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of above-mentioned prior art, the utility model aims to provide a debug circuit and HDMI interface equipment based on HDMI interface to the serial ports debugging scheme of solving current HDMI interface can't realize serial ports communication function and I2C communication function's problem simultaneously.
The technical scheme of the utility model as follows:
the utility model provides a debugging circuit based on HDMI interface for be connected with HDMI interface and control chip, it includes: the switching module and the level conversion module;
the switching module is respectively connected with the HDMI and the level conversion module and is used for outputting a detection signal to switch serial port communication and HDMI communication or I2C communication and HDMI communication;
and the level conversion module is respectively connected with the switching module, the HDMI interface and the control chip and is used for finishing the transmission of signal level according to the detection signal so as to realize serial port communication and I2C communication.
The utility model discloses a further setting, the switching module includes: the first resistor, the second resistor and the first triode; wherein,
one end of the first resistor is connected with a power pin of the HDMI, and the other end of the first resistor is respectively connected with one end of the second resistor and a base electrode of the first triode; the collector of the first triode is connected with the level conversion module, and the emitter of the first triode is grounded; the other end of the second resistor is grounded.
The utility model discloses a further setting, level conversion module includes: the first resistor, the second resistor, the third triode and the fourth resistor are connected in series; wherein,
one end of the third resistor is connected with a power supply voltage and the switching module respectively, and one end of the fourth resistor is connected with the power supply voltage and the switching module respectively;
the base electrode of the second triode is connected with the other end of the third resistor, the collector electrode of the second triode is connected with the serial data receiving pin of the HDMI, and the emitter electrode of the second triode is connected with the serial data transmitting pin of the control chip;
the base electrode of the third triode is connected with the other end of the fourth resistor, the collector electrode of the third triode is connected with the serial data receiving pin of the control chip, and the emitter electrode of the third triode is connected with the serial clock transmitting pin of the HDMI.
The utility model discloses a further setting, level conversion module still includes: and the anode of the first diode is connected with the emitter of the second triode, and the cathode of the first diode is connected with the collector of the second triode.
The utility model discloses a further setting, the voltage of the power supply foot of HDMI interface is +5V, mains voltage is +3.3V voltage.
The utility model discloses a further setting, first triode the second triode with the third triode is NPN type triode.
The utility model discloses a further setting, first diode is the schottky diode.
The utility model discloses a further setting, control chip's model is MT 9216.
The utility model discloses a further setting, the model of HDMI interface is HDMIA type interface.
Based on same utility model the design, the utility model also provides an HDMI interface device, it includes HDMI interface, control chip and as above the debugging circuit based on the HDMI interface, the debugging circuit based on the HDMI interface is connected with HDMI interface and control chip respectively.
The utility model provides a debug circuit and HDMI interface equipment based on HDMI interface, wherein, debug circuit and HDMI interface and control chip based on HDMI interface are connected, and it includes: the switching module and the level conversion module; the switching module is respectively connected with the HDMI and the level conversion module and is used for outputting a detection signal to switch serial port communication and HDMI communication or I2C communication and HDMI communication; and the level conversion module is respectively connected with the switching module, the HDMI interface and the control chip and is used for finishing the transmission of signal level according to the detection signal so as to realize serial port communication and I2C communication. The utility model discloses a switching module accomplishes switching between serial port communication and the HDMI communication or the switching between I2C communication and the HDMI communication, when switching to serial port communication or I2C communication, accomplishes the transmission of signal level through level conversion module in order to realize serial port communication and I2C communication to serial port communication function and I2C communication function have been realized simultaneously in the serial port debugging scheme of HDMI interface.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a connection schematic diagram of the debugging circuit and the control chip based on the HDMI interface and the HDMI interface in the present invention.
Fig. 2 is a schematic circuit diagram of the debugging circuit based on the HDMI interface in the present invention.
Fig. 3 is a schematic circuit diagram of a control chip according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of an HDMI interface according to an embodiment of the present invention.
The various symbols in the drawings: 100. a debugging circuit based on an HDMI interface; 101. a switching module; 102. a level conversion module; 200. an HDMI interface; 300. and a control chip.
Detailed Description
The utility model provides a debugging circuit and HDMI interface equipment based on HDMI interface has realized the function of serial port communication and I2C communication through the design of multiplexing HDMI interface, and wherein HDMI equipment can be the equipment that has the HDMI interface such as TV set, STB, display. In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the embodiments and claims, the articles "a", "an", "the" and "the" may include plural forms as well, unless the context specifically dictates otherwise. If there is a description in an embodiment of the present invention referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 to 4, the present invention provides a preferred embodiment of a debug circuit based on an HDMI interface.
As shown in fig. 1, the debugging circuit 100 based on the HDMI interface provided by the present invention is connected to an HDMI interface 200 and a control chip 300, and is configured to implement a serial port communication function, an I2C communication function and an HDMI communication function, so as to achieve the purpose of debugging an electronic product with the HDMI interface. The control Chip 300 is a System-on-a-Chip (SOC Chip), and can effectively reduce the development cost of electronic/information System products and shorten the development cycle.
In some embodiments, the HDMI interface-based debug circuit 100 includes a switch module 101 and a level shift module 102; the switching module 101 is respectively connected to the HDMI interface 200 and the level conversion module 102, and is configured to output a detection signal to switch serial communication and HDMI communication or switch I2C communication and HDMI communication; the level conversion module 102 is connected to the switching module 101, the HDMI interface 200, and the control chip 300, respectively, and is configured to complete transmission of signal levels according to the detection signal to implement serial communication and I2C communication.
Specifically, the switching module 101 is respectively connected to the HDMI interface 200 and the level shifter module 102, and if an HDMI cable is inserted into the HDMI interface 200, the level shifter module 102 does not operate, and the HDMI-interface-based debug circuit 100 performs normal HDMI signal communication. When the HDMI interface 200 is plugged into a debug tool, the switch module 101 outputs a detection signal to the level shift module 102, and the level shift module 102 starts to operate and performs serial communication and I2C communication by completing signal level transmission.
Therefore, the utility model discloses a switch module 101 accomplishes switching between serial port communication and the HDMI communication or the switching between I2C communication and the HDMI communication, when switching to serial port communication or I2C communication, accomplishes the transmission of signal level through level conversion module 102 in order to realize serial port communication and I2C communication to realized serial port communication function and I2C communication function simultaneously in the serial port debugging scheme of HDMI interface 200.
Referring to fig. 1 to 4, in a further implementation manner of an embodiment, the switching module 101 includes: the circuit comprises a first resistor R1, a second resistor R2 and a first triode Q1. One end of the first resistor R1 is connected to the power pin HDMI/5V of the HDMI interface 200, and the other end of the first resistor R1 is connected to one end of the second resistor R2 and the base of the first transistor Q1, respectively; the collector of the first transistor Q1 is connected to the level shift module 102, and the emitter of the first transistor Q1 is grounded; the other end of the second resistor R2 is grounded.
Further, the level shift module 102 includes: a third resistor R3, a fourth resistor R4, a second triode Q2 and a third triode Q3; one end of the third resistor R3 is connected to the power supply voltage and the switching module 101, and one end of the fourth resistor R4 is connected to the power supply voltage and the switching module 101; the base of the second transistor Q2 is connected to the other end of the third resistor R3, the collector of the second transistor Q2 is connected to the serial data receiving pin PC-RX/SDA of the HDMI interface 200, and the emitter of the second transistor Q2 is connected to the serial data transmitting pin UART-TX/SDA of the control chip 300; the base of the third transistor Q3 is connected to the other end of the fourth resistor R4, the collector of the third transistor Q3 is connected to the serial data receiving pin UART-RX/SDA of the control chip 300, and the emitter of the third transistor Q3 is connected to the serial clock transmitting pin PC-TX/SCL of the HDMI interface 200.
Specifically, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are NPN transistors. The voltage of the power pin of the HDMI interface 200 is +5V, that is, the first resistor R1 is connected to the +5V power voltage, the power voltage of the level conversion module 102 and the control chip 300 is +3.3V, the power voltage is further connected to a fifth resistor R5, wherein the fifth resistor R5 is a current-limiting resistor. The model of the control chip 300 is MT 9216. The HDMI interface 200 is an HDMIA interface, i.e., an HDMI standard interface. In some embodiments, the first transistor Q1, the second transistor Q2, and the third transistor Q3 may also be configured as PNN-type transistors.
When the HDMI interface 200 is plugged into a cable, a 5V level is introduced into the 18 pins (i.e., power pins) of the HDMI interface 200, an Ib current flows into the base of the first transistor Q1, and the first transistor Q1 is turned on in a saturated manner, so that the bases of the second transistor Q2 and the third transistor Q3 are pulled low, and the second transistor Q2 and the third transistor Q3 are turned off and closed, so that the level conversion module 102 does not operate, and at this time, communication of HDMI signals can be normally achieved.
When the HDMI interface 200 is plugged into a debug tool, since the HDMI/5V power pin of the HDMI interface 200 corresponding to the debug tool is not connected to a 5V level, the first transistor Q1 passes through the second resistor R2 and is grounded, so that the base current Ib of the first transistor Q1 is zero, at this time, the third transistor Q3 is turned off, and the second transistor Q2 and the third transistor Q3 are pulled up to 3.3V, so that the second transistor a2 and the third transistor Q3 are turned on, that is, the level conversion module 102 can start to operate, and serial communication or I2C communication function can be realized.
Referring to fig. 2, in a further implementation manner of an embodiment, the level shift module 102 further includes: a first diode D1, the anode of the first diode D1 is connected with the emitter of the second triode Q2, and the cathode of the first diode D1 is connected with the collector of the second triode Q2.
Specifically, the first diode D1 is a schottky diode, and the collector of the second transistor Q2 controls the level of the emitter of the second transistor Q3 through the unidirectional conductivity of the first diode D1.
Referring to fig. 1 to 4, a specific process for implementing the serial communication function is described below.
It can be understood that, since the UART is full duplex communication, the TX signal of the control chip 300 corresponds to the RX signal of the upper computer, and the RX signal of the control chip corresponds to the TX signal of the upper computer.
Because the TX signal of the control chip 300 and the TX signal of the upper computer are both external transmission signals, the serial data transmission pin UART-TX/SDA of the control chip 300 is connected to the emitter of the second transistor Q2, and the serial clock transmission pin PC-TX/SCL of the HDMI interface 200 is connected to the emitter of the third transistor Q3. When the serial data transmit pin UART-TX/SDA and serial clock transmit pin PC-TX/SCL are high, at this time, the bases of the second transistor Q2 and the third transistor Q3 are connected to 3.3V, and the serial data transmitting pin UART-TX/SDA is pulled high by the sixth resistor R6 of the control chip 300, the serial clock transmit pin PC-TX/SCL is pulled high by the eighth resistor R8 of the HDMI interface 200, the base of the second triode Q2 and the base of the third triode Q3 both have no Ib current, so that the second triode Q2 and the third triode Q3 are both cut off and closed, the serial data receiving pin UART-RX/SCL of the control chip 300 is pulled high by the seventh resistor R7, the serial data receiving pin PC-RX/SCL of the HDMI interface 200 is pulled high by the ninth resistor R9.
When the TX signal of the control chip 300 and the TX signal of the upper computer are both at a low level, since the bases of the second transistor Q2 and the third transistor Q3 are connected to a voltage of 3.3V, the bases of the second transistor Q2 and the third transistor Q3 both have a base current Ib, and the second transistor Q2 and the third transistor Q3 are turned on, so that the serial data receiving pin UART-RX/SCL of the SOC and the serial data receiving pin PC-RX/SCL of the HDMI interface 200 are pulled to a low level, thereby completing the level change from the RX signal to the TX signal and realizing the function of serial communication.
It should be noted that, since the negative electrode of the first diode D1 is connected to the collector of the second transistor Q2, that is, the RX signal connected to the upper computer is a slave signal, and only follows the level change of the TX signal of the control chip 300, there is no influence on serial communication.
Referring to fig. 1 to 4, a specific process for implementing the I2C communication function is described below.
First, according to the I2C protocol, when I2C is in idle mode, the SDA signal and the SCLL signal are both in high state, the SCL signal for I2C communication is provided by the master device, and the SDA is a bidirectional communication signal. When the I2C communication function is implemented, the master device is an upper computer, and the slave device is the control chip 300.
As can be seen from the above analysis, the signal output by the serial clock transmitting pin PC-TX/SCL of the HDMI interface 200 is an SCL signal of the host computer, which is a master signal, and the signal received by the serial data receiving pin UART-RX/SCL of the control chip 300 is an SCL signal of the control chip 300, which is a slave signal. Therefore, the level change of the serial data receiving pin UART-RX/SCL of the control chip 300 should be consistent with the serial clock transmitting pin PC-TX/SCL of the HDMI interface 200. When the signal of the serial clock transmitting pin PC-TX/SCL of the HDMI interface 200 is at a high level, since the base of the third transistor Q3 is pulled up to 3.3V, there is no Ib current at the base, the third transistor Q3 is turned off, and the serial data receiving pin UART-RX/SCL of the control chip 300 is pulled to a high level by the seventh resistor R7; when the signal of the serial clock transmitting pin PC-TX/SCL of the HDMI interface 200 is at a low level, since the base of the third transistor Q3 is pulled up to 3.3V, there is an Ib current, the third transistor Q3 is turned on in saturation, the serial data receiving pin UART-RX/SCL of the control chip 300 is pulled down to a low level, and the transfer of the SCL signal is completed.
In addition, since the SDA signal is half duplex communication, the serial data receiving pin PC-RX/SDA of the HDMI interface 200 and the serial data transmitting pin UART-TX/SDA of the control chip 300 can pull low and high levels to each other, but only allow signals to communicate from one direction at a time. In addition, when I2C is in idle mode, the SDA signal defaults to high.
Then, when the upper computer sends data to the control chip 300, since the initial states of the serial data receiving pin PC-RX/SDA of the HDMI interface 200 and the serial data transmitting pin UART-TX/SDA of the control chip 300 are both high, at this time, the second diode Q2 is turned off, and the first diode D1 is reversely biased and cannot be turned on; when the serial data receive pin PC-RX/SDA of the HDMI interface 200 goes low, the first diode D1 shown is forward biased, and the serial data transmit pin UART-TX/SDA of the control chip 300 is pulled low to low through the first diode D1. Thereafter, when the serial data receiving pin PC-RX/SDA of the HDMI interface 200 goes high, the first diode D1 is reversely biased, and the serial data transmitting pin UART-TX/SDA of the control chip 300 is pulled high by the sixth resistor R6. When the control chip 300 sends data to the upper computer, when the serial data transmitting pin UART-TX/SDA of the control chip 300 is at a high level, the second transistor Q2 is turned off, the first diode D1 is reversely biased and turned off, and the serial data receiving pin PC-RX/SDA of the HDMI interface 200 is at a high level. When the serial data transmitting pin UART-TX/SDA of the control chip 300 is low, the second transistor Q2 is saturated and turned on, and the first diode D1 is biased forward to pull the serial data receiving pin PC-RX/SDA of the HDMI interface 200 low. Therefore, the utility model provides a debug circuit 100 circuit based on HDMI interface can realize the two-way communication function of SDA signal.
Referring to fig. 1, in some embodiments, the present invention further provides an HDMI interface device, which includes an HDMI interface 200, a control chip 300, and the above-mentioned debug circuit 100 based on the HDMI interface, where the debug circuit 100 based on the HDMI interface is connected to the HDMI interface 200 and the control chip 300 respectively. As described in detail in the HDMI interface-based debug circuit 100, details thereof are not repeated herein.
To sum up, the utility model provides a debug circuit and HDMI interface equipment based on HDMI interface accomplishes switching between serial port communication and the HDMI communication or the switching between I2C communication and the HDMI communication through switching the module, when switching to serial port communication or I2C communication, the transmission of accomplishing the signal level through level conversion module is in order to realize serial port communication and I2C communication to serial port communication function and I2C communication function have been realized simultaneously in the serial port debugging scheme of HDMI interface. Additionally, the utility model discloses only adopt three triode and diode and peripheral circuit, can realize the function of serial communication and I2C communication through the scheme of multiplexing HDMI interface, not only simple process, and the realization cost is lower, has reduced manufacturing cost.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a debugging circuit based on HDMI interface for be connected with HDMI interface and control chip, its characterized in that includes: the switching module and the level conversion module;
the switching module is respectively connected with the HDMI and the level conversion module and is used for outputting a detection signal to switch serial port communication and HDMI communication or I2C communication and HDMI communication;
the level conversion module is respectively connected with the switching module, the HDMI interface and the control chip, and is used for completing the transmission of signal level according to the detection signal so as to realize serial communication or I2C communication.
2. The HDMI interface-based debugging circuit of claim 1, wherein the switching module comprises: the first resistor, the second resistor and the first triode; wherein,
one end of the first resistor is connected with a power pin of the HDMI, and the other end of the first resistor is respectively connected with one end of the second resistor and a base electrode of the first triode; the collector of the first triode is connected with the level conversion module, and the emitter of the first triode is grounded; the other end of the second resistor is grounded.
3. The HDMI interface based debugging circuit of claim 2, wherein the level shifting module comprises: the first resistor, the second resistor, the third triode and the fourth resistor are connected in series; wherein,
one end of the third resistor is connected with a power supply voltage and the switching module respectively, and one end of the fourth resistor is connected with the power supply voltage and the switching module respectively;
the base electrode of the second triode is connected with the other end of the third resistor, the collector electrode of the second triode is connected with the serial data receiving pin of the HDMI, and the emitter electrode of the second triode is connected with the serial data transmitting pin of the control chip;
the base electrode of the third triode is connected with the other end of the fourth resistor, the collector electrode of the third triode is connected with the serial data receiving pin of the control chip, and the emitter electrode of the third triode is connected with the serial clock transmitting pin of the HDMI.
4. The HDMI interface based debug circuit of claim 3, wherein said level shift module further comprises: and the anode of the first diode is connected with the emitter of the second triode, and the cathode of the first diode is connected with the collector of the second triode.
5. The HDMI interface based debugging circuit of claim 3, wherein a voltage of a power pin of the HDMI interface is +5V, and the power voltage is + 3.3V.
6. The HDMI interface based debugging circuit of claim 3, wherein the first transistor, the second transistor and the third transistor are NPN transistors.
7. The HDMI interface based debug circuit of claim 4, wherein said first diode is a Schottky diode.
8. The HDMI interface based debugging circuit of claim 1, wherein the model of said control chip is MT 9216.
9. The HDMI interface based debugging circuit of claim 1, wherein the HDMI interface is HDMIA type.
10. An HDMI interface device, comprising an HDMI interface, a control chip, and the HDMI interface based debug circuitry of any one of claims 1-9, wherein the HDMI interface based debug circuitry is connected to the HDMI interface and the control chip, respectively.
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| CN202122704964.2U CN216434919U (en) | 2021-11-05 | 2021-11-05 | Debugging circuit based on HDMI interface and HDMI interface device |
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| CN202122704964.2U CN216434919U (en) | 2021-11-05 | 2021-11-05 | Debugging circuit based on HDMI interface and HDMI interface device |
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