CN117177001A - HDMI extender based on MCU and use method thereof - Google Patents

Abstract

The application relates to the technical field of HDM I interfaces, and discloses a method for using an HDM I extender based on an MCU, which comprises the steps that after a system is electrified, the MCU initializes GPIO, I2C, UART and t timer peripherals; after a startup instruction is received, the addr i ver chip and the ret timer chip execute power-on logic; configuring two chips; reading back the configuration information of the two chips, and determining whether the two chips are successfully configured; if the configuration of the two chips is successful, the MCU waits, and if the configuration of the two chips is unsuccessful, the configuration operation is performed on the corresponding chips again, and the configuration information is read back. The application can reduce noise and amplify HDM I signals to make them transmitted in a long distance, and the unique ret timer processing can make them well used in various complex application scenes. The application also discloses an HDM I extender based on the MCU.

Description

HDMI extender based on MCU and use method thereof

Technical Field

The application relates to the technical field of HDMI interfaces, in particular to an HDMI extender based on an MCU and a use method thereof.

Background

HDMI (High-definition multimedia interface), also known as High-definition multimedia interface, is the first digital interface to support all-digital High-definition, multi-channel audio, and intelligent format and control command data, without compression, for transmission over a single cable.

Typically, an HDMI connection consists of a pair of signal source and sink, and sometimes multiple HDMI input or output devices may be included in a system. Each HDMI signal input interface can receive information from the connector according to the standard, and the signal output interface also carries all signal information. The HDMI data line and the receiver include three different TMDS data information channels and a clock channel, the channels support video, audio data and additional information, the video, audio data and additional information are transmitted to the receiver through the three channels, the clock of the video is transmitted through the TMDS clock channel, and after the receiver receives the frequency parameter, the information transmitted by the other three data information channels is restored.

In the video data transmission period, video pixel signals are transmitted on the HDMI data line, and the video signals are coded to generate 3 paths (namely 3 TMDS data information channels, 8 bits in each path) of 24-bit video data streams, and the 24-bit video data streams are input into the HDMI transmitter. The video signal of 24 bit pixel is transmitted through TMDS channel, 8 bit signal code of each channel is converted into 10 bit, a minimum signal sequence is transmitted in every 10 bit pixel clock period, the video signal is modulated into TMDS data signal, and finally the TMDS data signal is transmitted to the receiver for receiving.

The processing of the data information of the HDMI can have a plurality of different modes, that is, HMDI supports video coding in a plurality of modes, and through reasonable distribution of 3 TMDS data information channels, 4 of RGB digital chrominance components can be transmitted: 4:4 signals, 4 of YCbCr digital color difference components may also be transmitted: 2:2 signals, which can meet the transmission requirement of 24-bit video signals at the highest.

The HDMI1.3 specification has raised this upper limit to 225MHz at a rate of typically 25MHz to 165MHz per TMDS channel video pixel stream, and when the video format rate is below 25MHz, pixel repetition will be used for transmission, i.e., pixels in the video stream are reused. The maximum bandwidth of the 3 TMDS channels is up to 4.95Gbps when calculated by the highest 165MHz frequency of each TMDS channel, the maximum bandwidth of the 3 TMDS channels is up to 4.2 Gbps when used for transmitting 24-bit pixel video data coded in the R/G/B or Y/Cb/Cr format, the actual video signal transmission bandwidth is close to 4Gbps, and the bandwidth required by the 1080p high-definition video format of the current maximum specification is only 2.2Gbps, so that the sufficient bandwidth possessed by HDMI can not only meet the requirement of the current high-definition video, but also provide support for the higher-definition video format in a quite long time in the future.

Accordingly, a person skilled in the art provides an HDMI extender based on an MCU and a method for using the same, so as to solve the problems set forth in the background art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides an HDMI extender based on an MCU and a use method thereof, and the HDMI extender can well reduce noise and amplify HDMI signals, so that the HDMI extender can well perform long-distance transmission.

In some embodiments, the method for using the HDMI extender based on the MCU, the HDMI extender includes an MCU basic circuit, a driver chip peripheral basic circuit, a timer chip peripheral basic circuit, a module coupling circuit, and a power filter circuit, which are connected to each other, the method for using includes:

after the system is powered on, the MCU initializes the peripheral devices of GPIO and I2C, UART, timer;

after receiving a starting instruction, the driver chip and the retimer chip execute power-on logic;

configuring a driver chip and a retimer chip;

reading back configuration information of the driver chip and the retimer chip, and determining whether the configuration of the driver chip and the retimer chip is successful;

if the configuration of the driver chip and the retimer chip is successful, the MCU waits, and if the configuration of the driver chip or the retimer chip is unsuccessful, the configuration operation and the read-back of the configuration information are carried out on the corresponding chip again.

Further, when the configuration of the driver chip or the counter chip is unsuccessful, the configuration operation or the configuration information reading back operation is counted when the configuration operation or the configuration information reading back operation is carried out on the corresponding chip again.

Further, when the operation times of the readback configuration information of the driver chip or the retimer chip is larger than the set value, and the configuration of the driver chip or the retimer chip still fails, the physical abnormality of the corresponding chip is judged, and the chip is abandoned.

Further, when the number of configuration operations of the driver chip or the counter chip does not exceed the set value, the power-down logic is executed first, and then the power-up sequential logic is executed continuously.

Further, the driver chip is configured to perform noise reduction processing on the original signal, and then amplify the amplitude of the noise reduced signal.

Further, the retimer chip is used for disturbing, recombining and amplifying the HDMI signal.

The embodiment of the disclosure also provides an HDMI extender based on MCU, comprising: the MCU basic circuit, the peripheral basic circuit of the driver chip, the peripheral basic circuit of the timer chip, the module coupling circuit and the power supply filter circuit are mutually connected.

The application method of the HDMI extender based on the MCU provided by the embodiment of the disclosure can realize the following technical effects:

1. the application provides a method for using an HDMI extender based on an MCU (micro control Unit). After a system is electrified, the MCU configures an HDMI driver/retimeIC, and the HDMI driver/retimeIC is used as a relay to secondarily amplify and optimize HDMI signals so that the HDMI signals are more accurately transmitted in long distance.

2. The application provides a method for using an HDMI extender based on an MCU, which is optimized and upgraded for an HDMI signal transmission method, can well reduce and amplify HDMI signals, can well perform long-distance transmission, is unique in re-timer processing, can well be used for various complex application scenes, can also apply theoretical knowledge to other communication technologies, and has extremely high reference value.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

fig. 1 is a flowchart of a method for using the MCU-based HDMI extender of the present application.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

Examples:

referring to fig. 1, an embodiment of the present disclosure provides a method for using an HDMI extender based on an MCU, including the steps of:

s1, after the system is powered on, initializing peripheral equipment of GPIO and I2C, UART, timer by the MCU;

s2, after a starting-up instruction is received, the driver chip and the counter chip execute power-on logic;

s3, configuring a driver chip and a timer chip;

s4, reading back configuration information of the driver chip and the counter chip, and determining whether the driver chip and the counter chip are successfully configured;

s5, if the configuration of the driver chip and the re-timer chip is successful, the MCU waits, and if the configuration of the driver chip or the re-timer chip is unsuccessful, the configuration operation is performed on the corresponding chip again, and the configuration information is read back.

Optionally, when the configuration of the driver chip or the timer chip is unsuccessful, the configuration operation or the configuration information reading back operation is counted when the configuration operation or the configuration information reading back operation is performed on the corresponding chip again.

Optionally, when the number of operations of the readback configuration information of the driver chip or the retimer chip is greater than the set value, and the configuration failure of the driver chip or the retimer chip is still determined, the physical abnormality of the corresponding chip is determined, and the chip is abandoned.

Optionally, when the number of configuration operations of the driver chip or the counter chip does not exceed the set value, the power-down logic is executed first, and then the power-up sequential logic is executed continuously.

Optionally, the driver chip is configured to perform noise reduction processing on the original signal, and then amplify the amplitude of the noise-reduced signal.

Optionally, the retimer chip is used for disturbing, reorganizing and amplifying the HDMI signal.

The embodiment of the disclosure also provides an HDMI extender based on MCU, comprising: the MCU basic circuit, the peripheral basic circuit of the driver chip, the peripheral basic circuit of the timer chip, the module coupling circuit and the power supply filter circuit are mutually connected.

The embodiment of the disclosure provides a use method of an HDMI extender based on an MCU, which is mainly implemented in such a way that after a system is powered on, the MCU configures an HDMI driver/retimeIC, the HDMI driver/retimeIC serves as a relay, and HDMI signals are secondarily amplified and optimized, so that the signals are more accurately transmitted for a long distance.

The embodiment of the disclosure provides a use method of an HDMI extender based on MCU, which is optimized and upgraded for an HDMI signal transmission method, can well reduce and amplify HDMI signals, can well perform long-distance transmission, can well use the HDMI extender in various complex application scenes due to unique retimer processing, can also apply theoretical knowledge to other communication technologies, and has extremely high reference value.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (7)

1. The use method of the HDMI extender based on the MCU is characterized in that the HDMI extender comprises an MCU basic circuit, a driver chip peripheral basic circuit, a timer chip peripheral basic circuit, a module coupling circuit and a power supply filter circuit which are connected with each other, and the use method comprises the following steps:

after the system is powered on, the MCU initializes the peripheral devices of GPIO and I2C, UART, timer;

after receiving a starting instruction, the driver chip and the retimer chip execute power-on logic;

configuring a driver chip and a retimer chip;

reading back configuration information of the driver chip and the retimer chip, and determining whether the configuration of the driver chip and the retimer chip is successful;

if the configuration of the driver chip and the retimer chip is successful, the MCU waits, and if the configuration of the driver chip or the retimer chip is unsuccessful, the configuration operation and the read-back of the configuration information are carried out on the corresponding chip again.

2. The method of claim 1, wherein,

and when the configuration of the driver chip or the counter chip is unsuccessful, carrying out configuration operation and reading back configuration information on the corresponding chip again, and counting the configuration operation or the reading back configuration information operation.

3. The method of claim 2, wherein when the number of operations for reading back the configuration information by the driver chip or the counter chip is greater than a set value, the driver chip or the counter chip is still configured to fail, it is determined that the corresponding chip is physically abnormal, and the chip is discarded.

4. The method of claim 1, wherein,

when the number of the configuration operation times of the driver chip or the counter chip does not exceed the set value, the power-down logic is executed first, and then the power-up sequential logic is executed continuously.

5. The method of claim 2, wherein the driver chip is configured to perform noise reduction processing on the original signal, and then amplify the amplitude of the noise reduced signal.

6. The method of claim 1, wherein the retimer chip is configured to shuffle and reorganize the HDMI signal.

7. An HDMI extender based on an MCU, applied to the method of using an HDMI extender based on an MCU as defined in any one of claims 1 to 6, wherein the HDMI extender includes an MCU basic circuit, a driver chip peripheral basic circuit, a repeater chip peripheral basic circuit, a module coupling circuit and a power filter circuit, which are connected to each other.