CN108184085B

CN108184085B - Method and system for converting MIPI (Mobile industry processor interface) to HDMI (high-definition multimedia interface) data

Info

Publication number: CN108184085B
Application number: CN201711490425.5A
Authority: CN
Inventors: 陈东
Original assignee: Longsung Technology Shanghai Co ltd
Current assignee: Longsung Technology Shanghai Co ltd
Priority date: 2017-12-30
Filing date: 2017-12-30
Publication date: 2020-08-28
Anticipated expiration: 2037-12-30
Also published as: CN108184085A

Abstract

The embodiment of the invention discloses a method and a system for converting MIPI (Mobile industry processor interface) to HDMI (high-definition multimedia interface) data. A method for converting MIPI (Mobile industry processor interface) data into HDMI (high-definition multimedia interface) data comprises the following steps: the android intelligent device configured with the MIPI outputs a starting signal to a reset pin of an MIPI-HDMI chip connected with the android intelligent device; the starting signal is used for activating the MIPI to be converted into the HDMI chip to be in a working state; the android intelligent device outputs a video stream of a synchronous event and a continuous clock signal to a HOST MIPI end of the MIPI-to-HDMI chip in a Non-Burst mode; the MIPI-to-HDMI chip converts the video stream of the synchronous event into a signal in a preset format; the MIPI-to-HDMI chip converts the signals in the preset format into HDMI signals and sends the HDMI signals to connected receiving equipment which is provided with HDMI. The technical scheme of the embodiment is convenient for the terminal configured with the MIPI to transmit data to the terminal configured with the HDMI.

Description

Method and system for converting MIPI (Mobile industry processor interface) to HDMI (high-definition multimedia interface) data

Technical Field

The embodiment of the invention relates to a video interface technology, in particular to a method and a system for converting MIPI (mobile industry processor interface) to HDMI (high-definition multimedia interface) data.

Background

In the Multimedia video Interface technology, the types of interfaces of the screen are very many, and the common interfaces include a High Definition Multimedia Interface (HDMI), a vga (video Graphics array), and a Mobile Industry Processor Interface (MIPI). In Android (Android) mobile devices, MIPI is mostly used.

MIPI is a alliance established by companies such as ARM, Nokia, ST, and TI in 2003, and aims to standardize interfaces such as a camera, a display interface, a radio frequency/baseband interface, and the like inside a mobile phone, thereby reducing the complexity of mobile phone design and increasing design flexibility. Different WorkGroups exist below the MIPI alliance, and a series of internal interface standards of the mobile phone are respectively defined, such as a camera interface CSI, a display interface DSI, a radio frequency interface DigRF, a microphone/loudspeaker interface SLIMbus and the like.

HDMI is an abbreviation for High Definition Multimedia Interface (HDMI), and means a High Definition Multimedia Interface (HDMI), which is a digital video/audio Interface technology, and is a dedicated digital Interface suitable for video transmission, and can simultaneously transmit audio and video signals, and the highest data transmission speed is 18Gbps (version 2.0).

Without the need for digital-to-analog or analog-to-digital conversion prior to signal transmission. HDMI can be used in conjunction with broadband digital content protection to prevent unauthorized copying of copyrighted audio/video content.

The extra space of HDMI can be applied to audio/video format upgraded in the future.

HDMI also has a large margin because a 1080p video and an 8 channel audio signal require less than 0.5 GB/s. This allows it to be connected to a DVD player, receiver and PRR, respectively, with one cable.

Disclosure of Invention

The embodiment of the invention provides a method and a system for converting MIPI (Mobile industry processor interface) to HDMI (high-definition multimedia interface) data, which are used for converting MIPI data into HDMI data.

In a first aspect, an embodiment of the present invention provides a data conversion method for converting MIPI to HDMI, including:

the android intelligent device configured with the MIPI outputs a starting signal to a reset pin of an MIPI-HDMI chip connected with the android intelligent device; the starting signal is used for activating the MIPI to be converted into the HDMI chip to be in a working state;

the android intelligent device outputs a video stream of a synchronous event and a continuous clock signal to a HOST MIPI end of the MIPI-to-HDMI chip in a Non-Burst mode;

the MIPI-to-HDMI chip converts the video stream of the synchronous event into a signal in a preset format;

the MIPI-to-HDMI chip converts the signals in the preset format into HDMI signals and sends the HDMI signals to connected receiving equipment which is provided with HDMI.

Optionally, the signal with the preset format includes a signal of R/G/B/HS/VS/DE.

Optionally, the android smart device includes a chip of type qualcomm msm8909 as a central processing unit.

Optionally, before the android smart device configured with the MIPI outputs the start signal to the reset pin of the MIPI-to-HDMI chip connected to the android smart device, the method further includes:

applying a universal input and output pin as a reset pin for controlling the working state of the MIPI-HDMI chip in a DTS management device tree of the chip of the qualcomm msm8909, and defining the default state and the dormant state of the reset pin;

and creating a device node of the MIPI-to-HDMI conversion chip in a DTS management device tree of the chip of the qualcomm msm8909, and defining corresponding driving information.

Optionally, after the android smart device configured with the MIPI outputs the start signal to the reset pin of the MIPI-to-HDMI chip connected to the android smart device, the method further includes:

and the android intelligent device sends the configuration of a preset register to the MIPI-to-HDMI chip through an I2C interface so that the MIPI-to-HDMI chip completes data initialization.

In a second aspect, an embodiment of the present invention further provides a data conversion system for converting MIPI to HDMI, including:

the system comprises android intelligent equipment configured with MIPI, an MIPI-to-HDMI chip and receiving equipment configured with HDMI;

the MIPI of the android intelligent device is connected with the MIPI of the MIPI-to-HDMI chip and used for outputting a starting signal to a reset pin of the MIPI-to-HDMI chip connected with the MIPI-to-HDMI chip; the starting signal is used for activating the MIPI to be converted into the HDMI chip to be in a working state; outputting a video stream of a synchronous event and a continuous clock signal to a HOST MIPI end of the MIPI-to-HDMI chip in a Non-Burst mode;

the HDMI of the MIPI-to-HDMI chip is connected with the HDMI of the receiving device and used for converting the video stream of the synchronous event into a signal in a preset format; and converting the signal in the preset format into an HDMI signal and sending the HDMI signal to the connected receiving equipment which is provided with the HDMI.

Optionally, the android smart device is further configured to:

before outputting a starting signal to a reset pin of an MIPI-to-HDMI chip connected with the MIPI-to-HDMI chip, applying a universal input and output pin as a reset pin for controlling the working state of the MIPI-to-HDMI chip in a DTS management device tree of the chip of the qualcommsm 8909, and defining the default state and the dormant state of the reset pin; and creating a device node of the MIPI-to-HDMI conversion chip in a DTS management device tree of the chip of the qualcommsm 8909, and defining corresponding driving information.

Optionally, the android smart device is further configured to:

after the android intelligent device configured with the MIPI outputs a starting signal to a reset pin of a MIPI-to-HDMI chip connected with the android intelligent device, a preset register is configured and sent to the MIPI-to-HDMI chip through an I2C interface, so that the MIPI-to-HDMI chip completes data initialization.

The embodiment of the invention converts MIPI data into HDMI data through the MIPI-to-HDMI chip, solves the problem that data transmission is only carried out between interfaces of the same type in the prior art, and achieves the effect of conveniently transmitting data from a terminal configured with MIPI to a terminal configured with HDMI.

Drawings

Fig. 1 is a flowchart of a data conversion method from MIPI to HDMI in a first embodiment of the present invention;

fig. 2 is a flowchart of a data conversion method from MIPI to HDMI in the second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a MIPI-to-HDMI data conversion system in a third embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Example one

Fig. 1 is a flowchart of a data conversion method from MIPI to HDMI according to an embodiment of the present invention, where this embodiment is applicable to a case where a terminal configured with MIPI transmits data to a terminal configured with HDMI, and the method may be executed by a data conversion system from MIPI to HDMI, where the system includes an android smart device configured with MIPI, a MIPI to HDMI chip, and a receiving device configured with HDMI. The data conversion method for converting MIPI into HDMI specifically comprises the following steps:

step 110, the android intelligent device configured with the MIPI outputs a starting signal to a reset pin of the MIPI-HDMI chip connected with the android intelligent device; the starting signal is used for activating the MIPI to be converted into the HDMI chip to be in a working state; optionally, the android smart device includes a chip of type qualcomm msm8909 as a central processing unit. The android intelligent device outputs a starting signal to a reset pin of the MIPI-to-HDMI chip through a universal input and output pin of the qualcomm msm8909 chip.

Step 120, the android intelligent device outputs a video stream of a synchronous event and a continuous clock signal to a HOSTMIPI end of the MIPI-to-HDMI chip in a Non-Burst mode; optionally, the signal with the preset format includes a signal of R/G/B/HS/VS/DE.

Step 130, the MIPI to HDMI chip converts the video stream of the synchronous event into a signal in a preset format;

step 140, the MIPI to HDMI chip converts the signal in the preset format into an HDMI signal and sends the HDMI signal to the HDMI-equipped receiving device connected to the MIPI chip.

An example, the Qualcomm msm8909& android L version uses a managed Device Tree (DTS), including GPIOs. We first applied for a reset GPIO port GPIO14 in msm8909-pinctrl.dtsi and defined the default and sleep states of the port. And adding the node into MIPI-to-HDMI chip equipment, and creating an MIPI-to-HDMI chip equipment node in msm 8909-qrd-skii.dtsi.

The method includes that compatibility of the equipment is defined to be matched with id _ table of a driver in an equipment node of an MIPI-HDMI chip, and then probe equipment can be realized. It is also defined that I2C adapter used by the node is I2c _0, the default address of the device is reg ═ 0x48>, and the reset pin is GPIO 14.

The display of qualcomm uses the dtsi file to configure some parameters of mipi-dsi and panel. From spec of MIPI to HDMI chip, DSI signal requirements are as follows: non-burst mode (continue mode) Video mode, sync event, MIPI DSI.

According to the technical scheme, MIPI data are converted into HDMI data through the MIPI-to-HDMI chip, the problem that data transmission is only carried out between interfaces of the same type in the prior art is solved, and the effect that data are transmitted from a terminal provided with MIPI to a terminal provided with HDMI conveniently is achieved.

Example two

Fig. 2 is a flowchart of a data conversion method for converting MIPI to HDMI according to a second embodiment of the present invention, where the technical solution of this embodiment is further refined based on the above technical solution, and the method includes:

step 210, the android smart device configured with the MIPI outputs a start signal to a reset pin of the MIPI-to-HDMI chip connected to the android smart device.

Step 220, the android intelligent device sends a preset register configuration to the MIPI-to-HDMI chip through an I2C interface, so that the MIPI-to-HDMI chip completes data initialization.

And step 230, outputting the video stream of the synchronous event and a continuous clock signal to the HOSTMIPI end of the MIPI-to-HDMI chip by the android intelligent device in a Non-Burst mode.

And step 240, the MIPI to HDMI chip converts the video stream of the synchronous event into a signal in a preset format.

And step 250, converting the signal in the preset format into an HDMI signal by the MIPI-to-HDMI chip, and sending the HDMI signal to the connected receiving equipment configured with HDMI.

The driving process is to obtain a chip register configuration description, generate a signal of 150 milliseconds of pull-down at the reset pin of the MIPI to HDMI chip through an Application Processor (AP), that is, a chip of the qualcomm msm8909, and then pull up to make the chip work. The configuration given by the Field Application Engineer (FAE) is then sent to the chip through the I2C interface on the AP side. After configuration is completed, a Non-Burst mode, a video stream (video steam) of synchronous events (sync events), and a continuous clock signal need to be output at the HOST MIPI configuration end. The MIPI-to-HDMI chip can obtain the data packets from the DSI end, then converts the data packets into r/g/b/hs/vs/de signals, converts the r/g/b/hs/vs/de signals into HDMI signals, and sends the HDMI signals to the HDMI controller to be sent out.

It should be noted that, in order to prevent the power failure of the system from occurring when the MIPI-to-HDMI chip is woken up, the MIPI-to-HDMI chip needs to be reset again at the time of waking up, and initialization data is flushed through I2C.

According to the technical scheme, the initialization data are brushed in through the I2C, the MIPI-HDMI chip is reset again when the MIPI-HDMI chip is awakened, and the power failure condition is prevented when the MIPI-HDMI chip is awakened.

EXAMPLE III

Fig. 3 is a schematic structural diagram of a MIPI-to-HDMI data conversion system according to a third embodiment of the present invention, and as shown in fig. 3, the MIPI-to-HDMI data conversion system includes:

an android smart device 310 configured with MIPI, a MIPI-to-HDMI chip 320, and a receiving device 330 configured with HDMI;

the MIPI of the android intelligent device 310 is connected with the MIPI of the MIPI-to-HDMI chip 320, and is used for outputting a starting signal to a reset pin of the MIPI-to-HDMI chip 320 connected with the MIPI-to-HDMI chip; the starting signal is used for activating the MIPI to be converted into the HDMI chip to be in a working state; outputting a video stream of a synchronous event and a continuous clock signal to a HOST MIPI end of the MIPI-to-HDMI chip 320 in a Non-Burst mode;

the HDMI of the MIPI-to-HDMI chip 320 is connected to the HDMI of the receiving device 330, and is configured to convert the video stream of the synchronous event into a signal in a preset format; the signal in the preset format is converted into an HDMI signal and transmitted to the HDMI-equipped receiving device 330 connected thereto.

Optionally, the android smart device 310 includes a chip of type qualcomm msm8909 as a central processor.

Optionally, the android smart device 310 is further configured to:

The product can execute the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A data conversion method for converting MIPI (Mobile industry processor interface) into HDMI (high-definition multimedia interface), which is characterized by comprising the following steps:

the MIPI-to-HDMI chip converts the video stream of the synchronous event into a signal in a preset format; the signals with the preset format comprise signals of R/G/B/HS/VS/DE;

2. The method of claim 1, wherein the android smart device comprises a chip model number qualcommmms 8909 as a central processor.

3. The method of claim 2, before the MIPI-configured android smart device outputs a start signal to a reset pin of a MIPI-to-HDMI chip connected thereto, further comprising:

4. The method of claim 1, after the android smart device configured with MIPI outputs a start signal to a reset pin of a MIPI-to-HDMI chip connected thereto, further comprising:

5. A MIPI to HDMI data conversion system, comprising:

the HDMI of the MIPI-to-HDMI chip is connected with the HDMI of the receiving device and used for converting the video stream of the synchronous event into a signal in a preset format; converting the signal with the preset format into an HDMI signal and sending the HDMI signal to the connected receiving equipment which is provided with the HDMI; the signals with the preset format comprise signals of R/G/B/HS/VS/DE.

6. The system of claim 5, wherein the android smart device comprises a chip model number qualcommmms 8909 as a central processor.

7. The system of claim 6, wherein the android smart device is further configured to:

8. The system of claim 5, wherein the android smart device is further configured to: