CN219039744U

CN219039744U - Projector debugging tool and debugging system

Info

Publication number: CN219039744U
Application number: CN202223062744.5U
Authority: CN
Inventors: 蔡陈松; 孙旭涛; 何晓珊
Original assignee: Foxstar Technology Co ltd; Henan Costar Group Co Ltd
Current assignee: Foxstar Technology Co ltd; Henan Costar Group Co Ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-05-16
Anticipated expiration: 2032-11-18

Abstract

The utility model discloses a projector debugging tool and a projector debugging system, which belong to the technical field of projectors, wherein the projector debugging tool is connected with a debugging end and a debugged end and comprises a USB interface, a USB signal conversion chip, a tri-state logic gate chip and an HDMI interface. By arranging debugging tools at the debugging end and the debugged end, the problem that in the prior application technology, a developer cannot debug and upgrade the projector through the state of the whole projector is solved. The device is connected to the HDMI of the projector through the debugging tool, and can normally receive video signals transmitted by external HDMI equipment while performing development work such as data communication, debugging and firmware upgrading, so that the multifunctional effect can be realized by only using one common HDMI, the development efficiency and applicability are greatly improved, and the working stability of the projector at the debugged end is also greatly improved.

Description

Projector debugging tool and debugging system

Technical Field

The utility model relates to the technical field of projectors, in particular to a projector debugging tool and a projector debugging system.

Background

The projector is used as a device capable of projecting images or videos onto a curtain, and can be connected with a computer, VCD, DVD, BD, a game machine, DV and the like through different interfaces to play corresponding video signals. The intelligent projector needs to adjust the parameters of the related registers in the main chip in the development stage so as to ensure the image quality and the sound quality to be optimized to the optimal effect; the system software version is required to be improved continuously and stabilized in an upgrading mode; these tasks require that the projector be connected to the computer for communication by connecting to a special debug tool after the relevant software is installed on the computer.

In the application of the existing debugging system, a debugging tool is connected with a computer through a USB interface, the serial interface is used as a debugging interface for a developer, and the debugging tool is connected with a projector through a serial interface; the design pursues simplicity based on the appearance interface of the modern intelligent projector, and the serial interface is generally embodied in a built-in main board of the machine and cannot be used as an external interface of the projector for a user. In the product research and development stage, developers cannot debug and upgrade the projector according to the state of the whole machine, the shell of the machine must be disassembled, and after the serial interface position in the built-in main board is found, the debugging tool and the computer are connected for communication, so that the development efficiency is greatly influenced; meanwhile, the stability and the safety of the machine at the debugged end are greatly influenced without the protection of the shell.

Disclosure of Invention

In view of the above, an object of an embodiment of the present utility model is to provide a debugging tool and a debugging system for a projector, which are aimed at solving the problem that the existing application technology cannot be directly connected with the debugging tool through an external interface of the projector, and perform development work such as communication, debugging, and upgrading the system.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the first aspect of the present utility model provides a projector debugging tool, which is connected with a debugging end and a debugged end, wherein the debugging end is a PC end, the debugged end is a projector, and the projector debugging tool comprises:

the USB interface is connected with the debugging end and is used for transmitting USB signals which are output by the debugging end and contain debugging instructions and exchanging communication data between the debugging end and the debugged end;

the USB signal conversion chip is connected with the USB interface and used for converting USB signals transmitted by the USB interface into UART signals and IIC signals;

the tri-state logic gate chip is connected with the USB signal conversion chip and is used for switching UART signals and IIC signals; and

the HDMI comprises an HDMI_1 interface for forwarding UART signals, IIC signals and HDMI video signals and an HDMI_2 interface for transmitting HDMI video signals, wherein the HDMI interface performs interaction between the debugging end and the debugged end according to the forwarded UART signals, IIC signals and HDMI video signals.

As a further scheme of the utility model, the USB interface is a USB serial bus of which the USB device is connected to the debug end, and the USB serial bus uses a 4-wire cable including VCC, group signal wire, u+ data transmission wire, and U-data transmission wire as a signal transmission medium; the U+ data transmission line is connected with a pull-up resistor, and the pull-up resistor is used for enabling a signal line to become high level when the USB device is connected to the debugging end through a USB interface so that the host at the debugging end detects that the USB device is connected.

As a further scheme of the utility model, the USB interface is further configured to receive a USB signal including a debug instruction sent by the debug end to the USB device after the debug end detects that the USB device is connected, and feed back a descriptor returned by the USB device.

As a further scheme of the utility model, the USB signal conversion chip is used for converting USB signals into IIC signals or converting USB signals into UART signals based on the FT2232D chip, and outputting UART signals or IIC signals for the tri-state logic gate chip at the rear end; the FT2232D chip includes:

the LDO voltage stabilizer is used for providing voltage for supplying power to an internal logic circuit of the USB signal conversion chip;

the UTMI PHY unit is used for receiving and transmitting data by being connected with the USB interface;

the USB protocol engine and the FIFO control unit are used for supporting the USB protocol specification of the PC end;

the multipurpose UART/FIFO controller comprises a UART/FIFO controller A and a UART/FIFO controller B, wherein the UART/FIFO controller A is configured as an IIC communication interface, and the UART/FIFO controller B is configured as a UART communication interface; and

the buffer area comprises a TX buffer area and an RX buffer area, and the TX buffer area and the RX buffer area are respectively used for storing data sent by the host and the slave.

As a further scheme of the utility model, the three-state logic gate chip comprises a UART unit and an IIC unit, wherein the IIC unit prohibits output when the UART unit works, and the IIC unit prohibits output when the IIC unit works, and the UART unit switches the output of the UART signal and the IIC signal.

As a further scheme of the utility model, UART signals and IIC signals forwarded in the HDMI_1 interface are UART signals and IIC signals output by a tri-state logic gate, and the HDMI video signals are video signals transmitted by the HDMI source equipment and received by the HDMI_1 interface through the HDMI_2 interface.

As a further scheme of the utility model, the HDMI_1 interface of the HDMI interface is used for being connected with a projector; and the HDMI_2 interface of the HDMI interface is used for being connected with HDMI source equipment including a high-definition player and a playing box.

The second aspect of the utility model provides a debugging system, which comprises the projector debugging tool, a debugging end connected with a USB interface of the projector debugging tool, and a debugged end connected with a UART/IIC interface of the projector debugging tool.

In summary, compared with the prior art, the embodiment of the utility model has the following beneficial effects:

according to the projector debugging tool and the projector debugging system, the debugging tools are arranged at the debugging end and the debugged end, so that the problem that in the existing application technology, a developer cannot debug and upgrade the projector through the state of the whole projector is solved. The device is connected to the HDMI of the projector through the debugging tool, and can normally receive video signals transmitted by external HDMI equipment while performing development work such as data communication, debugging and firmware upgrading, so that the multifunctional effect can be realized by only using one common HDMI, the development efficiency and applicability are greatly improved, and the working stability of the projector at the debugged end is also greatly improved.

In order to more clearly illustrate the structural features and efficacy of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a block diagram of a projector debugging tool and a debugging system according to an embodiment of the utility model.

Fig. 2 is a schematic diagram of USB device connection in a projector debugging tool according to an embodiment of the utility model.

Fig. 3 is a schematic diagram of an internal structure of FT2232D in a projector debugging tool according to an embodiment of the present utility model.

Fig. 4 is a circuit diagram of FT2232D configuration IIC/UART communication in a projector debugging tool according to an embodiment of the present utility model.

Fig. 5 is a circuit diagram of HDMI signal expansion in a projector debugging tool according to an embodiment of the present utility model.

Fig. 6 is a circuit diagram of a 74LS125 logic switch in a projector debugging tool according to an embodiment of the utility model.

Fig. 7 is a flowchart of a projector debugging tool and a debugging system according to an embodiment of the utility model.

Fig. 8 is a schematic circuit diagram of a USB interface connected to a USB signal conversion chip in a projector debugging tool according to an embodiment of the present utility model.

Fig. 9 is a schematic circuit diagram of an hdmi_1 interface in a projector debugging tool according to an embodiment of the present utility model.

Fig. 10 is a schematic circuit diagram of an hdmi_2 interface in a projector debugging tool according to an embodiment of the present utility model.

Detailed Description

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The technical scheme of the utility model is further described below with reference to the accompanying drawings and specific embodiments.

In the application of the existing debugging system, because the serial interface is generally embodied in a built-in main board of the machine, the shell of the machine must be disassembled, and after the serial interface position in the built-in main board is found, the debugging tool and the computer can be connected for communication, the external interface of the projector can not be directly connected with the debugging tool, and development work such as communication, debugging, upgrading of the system and the like can be performed, so that the development efficiency is greatly influenced.

Referring to fig. 1, the projector debugging tool is connected with a debugging end and a debugged end, wherein the debugging end is a PC end, the debugged end is a projector, and the projector debugging tool comprises a USB interface, a USB signal conversion chip, a tri-state logic gate chip and an HDMI interface.

The USB interface is connected with the debugging end, and is used for transmitting USB signals which are output by the debugging end and contain debugging instructions, and exchanging communication data between the debugging end and the debugged end.

The USB signal conversion chip is connected with the USB interface and is used for converting USB signals transmitted by the USB interface into UART signals and IIC signals.

The tri-state logic gate chip is connected with the USB signal conversion chip and is used for switching UART signals and IIC signals.

The projector debugging tool is connected with a PC or notebook computer equipment at a debugging end through the arranged USB interface and is used for receiving USB signals, the USB signal conversion chip is used for converting the USB signals into UART signals and IIC signals, the UART signals and the IIC signals are switched by the tri-state logic gate chip, and the UART signals, the IIC signals and the video signals are forwarded to the projector at the debugged end through the HDMI interface connector, so that the development efficiency is greatly improved, and the working stability of the projector at the debugged end is also greatly improved.

Referring to fig. 2, the USB interface is a USB serial bus with a USB device connected to the debug end, where the USB serial bus uses a 4-wire cable including VCC, group signal wire, u+ data transmission wire, and U-data transmission wire as a signal transmission medium; the U+ data transmission line is connected with a pull-up resistor, and the pull-up resistor is used for enabling a signal line to become high level when the USB device is connected to the debugging end through a USB interface so that the host at the debugging end detects that the USB device is connected.

For example, when a USB device accesses a computer at the debug end, the process of identifying the USB device may be divided into two phases. The first phase is USB device detection: the U+ data transmission line of the USB device is connected through a pull-up 1.5K resistor, wherein the pull-up resistor is connected with D+ to indicate that the device works in a full-speed or high-speed mode; when the device is connected with the host computer of the computer through the USB interface, the pull-up resistor enables the signal line to be high level, so that the host computer of the computer at the debugged end detects that the USB device is connected.

The USB interface is also used for receiving a USB signal which is sent to the USB device by the debugging end and contains a debugging instruction after the debugging end detects that the USB device is accessed, and feeding back a descriptor returned by the USB device.

Illustratively, the second phase is an enumeration process, where the computer sends various USB command requests to the USB device, which upon receipt of the command returns a device descriptor, a configuration descriptor, an interface descriptor, an endpoint descriptor, etc., by which the type of the USB device is identified, for example: such as human interface class devices, mass storage class devices. And then the computer loads the corresponding drive, the host computer distributes a single address to the external equipment and initializes the equipment, and after the initialization is completed, the I/O operation can be performed on the equipment to complete the exchange of communication data.

The USB signal conversion chip is used for converting USB signal into IIC signal communication or converting USB signal into UART signal communication based on the FT2232D chip, and outputting UART signal or IIC signal for the tri-state logic gate chip at the rear end. Referring to fig. 3, the FT2232D chip includes an LDO regulator, UTMI PHY unit, USB protocol engine and FIFO control unit, a multipurpose UART/FIFO controller, and a buffer.

The LDO voltage stabilizer is used for providing voltage to supply power for an internal logic circuit of the USB signal conversion chip.

The UTMI PHY unit is used for carrying out data transceiving with the USB interface.

The USB protocol engine and the FIFO control unit are used for supporting the PC end USB protocol specification.

The multipurpose UART/FIFO controller comprises a UART/FIFO controller A and a UART/FIFO controller B, wherein the UART/FIFO controller A is configured to be an IIC communication interface, and the UART/FIFO controller B is configured to be a UART communication interface.

The buffer area comprises a TX buffer area and an RX buffer area which are respectively used for storing data sent by the host and the slave.

Therefore, as shown in fig. 3, which is an internal structure diagram of the FT2232D chip, the FT2232D chip provides 3.3V voltage to its internal logic circuit through its own LDO regulator, and the USB protocol engine and FIFO control unit are responsible for supporting the USB protocol specification at the PC end, and transmit and receive data through the UTMI PHY unit. The FT2232D chip is internally provided with two multipurpose UART/FIFO controllers which are mutually independent and can be configured into various communication modes according to practical application. The TX buffer and the RX buffer are used to store data transmitted by the host and the slave, respectively.

It should be noted that, the FT2232D chip integrates a USB protocol engine therein, supports the USB2.0 high-speed specification, and can provide 2 configurable parallel and serial interfaces supporting the USB2.0 high-speed specification, and the highest speed can reach 480Mb/S. In the application of the embodiment, the FT2232D chip converts the USB signal into a UART signal and an IIC signal; and according to the actual situation, outputting UART signals or IIC signals for the tri-state logic gate chip at the back end.

Referring to fig. 4, in the configuration IIC/UART communication circuit of the USB signal conversion chip, the circuit uses a 6M crystal as a clock, the USB interface supplies power to the debug tool through a 5V voltage, the 5V voltage is input to the FT2232D chip, and the FT2232D chip integrates a 3.3V level converter and a power-on reset circuit therein for supplying power and resetting. USB signals sent from the computer directly enter Pin7 and Pin8 pins of the FT2232D chip through a USB interface, and the USB signals are converted into UART signals and IIC signals through a logic unit inside the FT2232D chip.

Specifically, MPSSE (multi-protocol synchronous serial engine) of the chip is configured through software of the PC end, so that the MPSSE works in an IIC communication mode or a UART communication mode, and an analog communication interface between the PC end and the display is established. The configuration information is stored in an externally hung EEPORM chip AT93C46DN, and the FT2232D chip can convert the USB interface into two serial UART and IIC protocols through the configuration information.

The three-state logic gate chip comprises a UART unit and an IIC unit, wherein the IIC unit prohibits output when the UART unit works, and the IIC unit prohibits output when the IIC unit works, and the UART unit switches the output of UART signals and IIC signals. Preferably, the tri-state logic gate chip is a chip with a model 74LS125, and is used as a four-way tri-state bus buffer integrated circuit for switching UART signals and IIC signals.

The UART signals and the IIC signals forwarded in the HDMI_1 interface are UART signals and IIC signals output by a tri-state logic gate, wherein the UART signals are used for communication, upgrading programs, and the IIC signals are used for debugging registers; the HDMI video signal is a video signal transmitted by the HDMI source device and received by the HDMI source device, where the hdmi_1 interface is connected to the HDMI source device through the hdmi_2 interface, and the HDMI source device includes, but is not limited to, a high-definition player and a playing box.

The HDMI_1 interface of the HDMI interface is used for being connected with a projector; and the HDMI_2 interface of the HDMI interface is used for being connected with HDMI source equipment including a high-definition player and a playing box.

Referring to fig. 5, UART signals are respectively output b_rxd and b_txd signals to the tri-state logic gate chip 74ls125 via Pin39 and Pin40 of the FT2232D chip, and iic bus signals are respectively output sda_a and sck_a signals to the tri-state logic gate chip 74LS125 via Pin23 and Pin24 of the FT2232D chip. Referring to fig. 6, the 74LS125 is logically switched to integrate the UART signal and the IIC signal from four input/output signals into two input/output signals, so as to facilitate connection with the HDMI interface of the projector to be tested.

Referring to fig. 5, the projector to be tested is only provided with one HDMI interface, when the HDMI interface of the projector to be tested is used as a communication control interface, the HDMI video image signal cannot be accessed, therefore, in order to solve the problem that the HDMI video image signal interface is occupied by IIC/UART, the hdmi_1 interface needs to be multiplexed and expanded, that is, the video image signal transmitted by the HDMI source device (high definition player, playing box, etc.) is extended and transmitted to the hdmi_2, and then connected with the HDMI interface of the projector to be tested through the hdmi_2 interface, so as to complete circuit connection, and circuit diagrams for completing circuit connection are shown in fig. 8, 9 and 10.

In one embodiment of the present utility model, there is also provided a debug system including the projector debug tool as described above, further including a debug terminal connected to a USB interface of the projector debug tool, and a debugged connected to a UART/IIC interface of the projector debug tool. When the projector debugging tool is used for testing the projector, the projector to be tested is connected with a communication interface of the PC end through the HDMI_1 interface, and the FT2232D chip is used for completing conversion from USB signal to IIC signal communication or from USB signal to UART signal communication, so that the PC end can complete interaction with the projector to be tested through software instructions.

Referring to FIG. 6, the debug tool and system workflow includes the steps of:

step 1, starting to connect PC or HDMI source equipment through a debugging tool, and after circuit configuration is completed, detecting a USB port by software to determine equipment connection;

step 2, the PC end obtains the communication type through a tool and starts a related data communication mode;

step 3, if the type of UART communication is adopted, the PC is communicated with the UART communication of the projector to be tested, and UART communication is carried out;

step 4, if the type of IIC communication is adopted, the PC is connected with the IIC communication of the projector to be tested, and IIC communication is carried out;

step 5, if the transmission type of the HDMI video image signal is the transmission type, the HDMI source device is connected with the HDMI interface of the projector to be tested, and the HDMI video image signal is transmitted;

and step 6, after the projector to be tested receives the related functional instructions, executing corresponding operations.

In this embodiment, the UART signal may also be used to upgrade a program, or may read print information of the projector; the IIC signal can be used to debug the registers of the projector to ensure that the image quality, sound quality can be optimized to the best effect. The HDMI_1 interface of the HDMI interface is used for being connected with a projector, and the HDMI_2 interface is used for being connected with HDMI source equipment such as a high-definition player and a playing box.

The technical principle of the present utility model has been described above in connection with specific embodiments, but is only the preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. Other embodiments of the utility model will occur to those skilled in the art without the exercise of inventive effort and are intended to fall within the scope of the utility model.

Claims

1. The projector debugging tool is characterized in that the projector debugging tool is connected with a debugging end and a debugged end, the debugging end is a PC end, and the debugged end is a projector; the projector debugging tool includes:

2. The projector debugging tool according to claim 1, wherein the USB interface is a USB serial bus of a USB device connected to the debugging end, the USB serial bus being based on a 4-wire cable including VCC, group signal wire, u+ data transmission wire, and U-data transmission wire as a signal transmission medium; the U+ data transmission line is connected with a pull-up resistor, and the pull-up resistor is used for enabling a signal line to become high level when the USB device is connected to the debugging end through a USB interface so that the host at the debugging end detects that the USB device is connected.

3. The projector debugging tool according to claim 2, wherein the USB interface is further configured to receive a USB signal including a debugging instruction sent by the debugging end to the USB device after the debugging end detects that the USB device is connected, and feed back a descriptor returned by the USB device.

4. The projector debugging tool according to claim 1, wherein the USB signal conversion chip is configured to convert a USB signal into an IIC signal communication or a USB signal into a UART signal communication based on the FT2232D chip, and output the UART signal or the IIC signal for the tri-state logic gate chip at the back end; the FT2232D chip includes:

5. The projector debugging tool of claim 1, wherein the tri-state logic gate chip comprises a UART unit and an IIC unit, the UART unit being operable to disable output by the IIC unit, the IIC unit being operable to disable output by the UART unit, switching between UART signal and IIC signal output.

6. The projector debugging tool according to claim 1, wherein UART signals and IIC signals forwarded in the hdmi_1 interface are UART signals and IIC signals output by tri-state logic gates, and the HDMI video signal is a video signal transmitted by the HDMI source device received by the hdmi_1 interface connected to the HDMI source device through the hdmi_2 interface.

7. The projector debugging tool of claim 6, wherein the hdmi_1 interface of the HDMI interface is for connection with a projector; and the HDMI_2 interface of the HDMI interface is used for being connected with HDMI source equipment including a high-definition player and a playing box.

8. A debug system comprising the projector debug tool of any of claims 1-7, further comprising a debug end connected to a USB interface of the projector debug tool, and a debugged connected to a UART/IIC interface of the projector debug tool.