CN113703348A - Mode control device and control method thereof - Google Patents
Mode control device and control method thereof Download PDFInfo
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- CN113703348A CN113703348A CN202110795702.3A CN202110795702A CN113703348A CN 113703348 A CN113703348 A CN 113703348A CN 202110795702 A CN202110795702 A CN 202110795702A CN 113703348 A CN113703348 A CN 113703348A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/60—Software deployment
- G06F8/65—Updates
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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Abstract
The application provides a mode control device and a control method thereof, which are used for mode control of embedded multimedia equipment, wherein the embedded multimedia equipment comprises a program downloading mode and a normal working mode, and in the two modes, the level signals of a mode control end of the embedded multimedia equipment are opposite. The mode control device comprises a signal control circuit, one end of the signal control circuit is connected with a programmer through a USB connector, the other end of the signal control circuit is connected with the embedded multimedia equipment, and when the signal control circuit detects that the level of the signal output end of the USB connector is turned, the signal control circuit outputs a preset level signal to the mode control end of the embedded multimedia equipment to control the level signal of the mode control end to be turned, so that the embedded multimedia equipment enters a program downloading mode after being electrified.
Description
Technical Field
The application relates to the technical field of communication of commercial vehicles, in particular to a mode control device and a control method thereof.
Background
With the continuous upgrade of the comfort level of the commercial vehicle, the embedded multimedia equipment installed on the vehicle is gradually popularized and used for playing audio, video and the like, and good experience is brought to users.
When the embedded multimedia equipment downloads and updates programs, the programs are generally required to be updated through the USB communication with the computer terminal, the USB communication is required to be normal, meanwhile, the FEL pin of the embedded multimedia equipment needs to be manually set to be a low level, the use is inconvenient, the time consumption is long, the efficiency is low, and the factory batch operation is particularly inconvenient.
Disclosure of Invention
The embodiment of the application provides a mode control device, which is used for the mode control of an embedded multimedia device, the embedded multimedia device includes a program download mode and a normal operating mode, wherein in both modes, the mode control end of the embedded multimedia equipment has opposite level signals, the mode control device comprises a signal control circuit, one end of the signal control circuit is connected with the programmer through a USB connector, the other end of the signal control circuit is connected with the embedded multimedia equipment, when the signal control circuit detects that the level of the signal output end of the USB connector is overturned, the signal control circuit outputs a preset level signal to the mode control end of the embedded multimedia equipment, and controls the level signal of the mode control end to turn over, so that the embedded multimedia equipment enters a program downloading mode after being electrified.
According to some embodiments, the preset level signal comprises a low level signal.
According to some embodiments, the mode control device further includes a response receiving circuit, one end of the response receiving circuit is connected to the embedded multimedia device, the other end of the response receiving circuit is connected to the signal control circuit, the response receiving circuit receives a response signal from the embedded multimedia device and then sends the response signal to the signal control circuit, and the signal control circuit stops outputting the preset level signal, so that the embedded multimedia device directly enters a normal working mode after the program downloading is completed.
According to some embodiments, the mode control device further comprises a delay circuit, the delay circuit is connected to the signal control circuit, and controls the signal control circuit to stop outputting the preset level signal after entering the program downloading mode for a preset delay time, so that the embedded multimedia device directly enters the normal operating mode after the program downloading is completed.
According to some embodiments, the signal control circuit comprises a detection circuit and a signal output circuit, wherein the detection circuit is connected with a programmer through a USB connector and detects whether the level of a signal output end of the USB connector is inverted; one end of the signal output circuit is connected with the detection circuit, the other end of the signal output circuit is connected with a mode control end of the embedded multimedia device, and when the detection circuit detects that the level of the signal output end of the USB connector is turned over, the signal output circuit outputs the preset level signal to the mode control end, so that the embedded multimedia device enters a program downloading mode.
According to some embodiments, the signal control circuit comprises a monostable circuit.
According to some embodiments, the monostable circuit includes a first resistor and a switching tube, a first end of the first resistor is connected to the signal output end of the USB connector, and a second end of the first resistor is connected to the power ground; the control end of the switch tube is connected with the signal output end of the USB connector, the first end of the switch tube is connected with a preset level signal end, and the second end of the switch tube is connected with the power ground.
According to some embodiments, the monostable further comprises a diode connected in anti-parallel across the first resistor.
According to some embodiments, the delay circuit includes a first capacitor and a second resistor connected in series, and changing a product of a capacitance value of the first capacitor and a resistance value of the second resistor changes the delay time.
An embodiment of the present application further provides a control method of the mode control apparatus, which is applied to mode control of an embedded multimedia device, and the control method includes: when the embedded multimedia equipment is powered on and enters a normal working mode, the signal control circuit detects whether the level of the signal output end of the USB connector is turned over; when the level of the signal output end of the USB connector is turned over, the signal control circuit outputs a preset level signal to the mode control end of the embedded multimedia equipment, so that the embedded multimedia equipment enters a program downloading mode.
According to some embodiments, the control method further comprises: and after delaying preset time or receiving a response signal from the embedded multimedia equipment, the signal control circuit stops outputting the preset level signal, so that the embedded multimedia equipment directly enters a normal working mode after the program downloading is finished.
According to the technical scheme, automatic mode conversion of the embedded multimedia equipment of the commercial vehicle is achieved through the external device, the updating program is automatically downloaded, the inconvenience that a signal terminal needs to be manually lowered when the program is downloaded in the past is overcome, and the use convenience and the program updating efficiency are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a functional block diagram of a mode control apparatus according to an embodiment of the present disclosure.
Fig. 2 is a functional block diagram of another mode control device according to an embodiment of the present disclosure.
Fig. 3 is a circuit diagram of a chip built in a USB connector according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a test voltage waveform of an embedded multimedia device according to an embodiment of the present application.
Fig. 5 is a functional block diagram of another mode control device according to an embodiment of the present disclosure.
Fig. 6 is a schematic diagram of a monostable dot voltage waveform according to an embodiment of the present disclosure.
Fig. 7 is a schematic voltage waveform of an FEL signal when the USB plug is plugged and unplugged according to an embodiment of the present disclosure.
Fig. 8 is a flowchart illustrating a control method of a mode control apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be understood that the terms "first", "second", etc. in the claims, description, and drawings of the present application are used for distinguishing between different objects and not for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this application, 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.
Fig. 1 is a functional block diagram of a mode control apparatus according to an embodiment of the present disclosure.
Commercial vehicles such as passenger cars, vans, taxis, etc. are equipped with embedded multimedia devices. The embedded multimedia device generally downloads programs when leaving the factory. Specifically, taking the embedded multimedia device MP5 as an example, when the BootLoader of the mode control terminal of the embedded multimedia device MP5 is a high level signal, the embedded multimedia device MP5 enters a normal operating mode after being powered on, and when the BootLoader of the mode control terminal of the embedded multimedia device MP5 is a low level signal, the embedded multimedia device enters a program downloading mode after being powered on.
As shown in fig. 1, the mode control apparatus 100 is used for mode control of the embedded multimedia device 200, and the embedded multimedia device 200 includes a program download mode and a normal operation mode, in which BootLoader level signals of the mode control terminal of the embedded multimedia device 200 are opposite. The mode control device 100 includes a signal control circuit 110.
One end of the signal control circuit 110 is connected to the programmer 400 (generally, a computer) via the USB connector 300, and the other end is connected to the embedded multimedia device 200. When the signal control circuit detects that the level of the signal output end of the USB connector 300 is turned over, the signal control circuit outputs a preset level signal to the mode control end BootLoader of the embedded multimedia device 200, and controls the embedded multimedia device 200 to enter a program downloading mode.
Generally, the predetermined level signal is a low level signal, but not limited thereto.
Taking the embedded multimedia device MP5 as an example, the embedded multimedia device MP5 adopts a scheme of a USB disk program writing, the USB connector adopts a fast-charging protocol IC, the operating mode of the IC is not controlled by software at the time of power-on, when the program is written after power-on, the level of the signal output terminal of the USB is inverted, when the signal control circuit 110 detects that the level of the signal output terminal of the USB connector 300 is inverted, the signal control circuit 110 outputs a low-level signal, so that the BootLoader at the mode control terminal of the embedded multimedia device MP5 is at a low level, and the embedded multimedia device MP5 enters a program downloading mode to update the program.
Optionally, the signal control circuit 110 stops outputting the preset level signal in a response receiving manner or a delay control manner, so that the embedded multimedia device 200 directly enters the normal operating mode after the program is downloaded.
According to the technical scheme, automatic mode conversion of the embedded multimedia equipment of the commercial vehicle is achieved through the external device, the updating program is automatically downloaded, the inconvenience that the signal terminal needs to be manually lowered when the program is downloaded in the prior art is overcome, and the use convenience and the program updating efficiency are improved.
Fig. 2 is a functional block diagram of another mode control device according to an embodiment of the present disclosure.
As shown in fig. 2, in the embodiment, the microcontroller EPU of the commercial vehicle is used as a mode control device to perform mode control of the embedded multimedia device, and the microcontroller EPU is generally used in taxies, buses and trucks, and is available in local resources and convenient to apply.
The mode control apparatus 100 is used for mode control of the embedded multimedia device 200, and the embedded multimedia device 200 includes a program download mode and a normal operation mode, in which BootLoader level signals of the mode control terminal of the embedded multimedia device 200 are opposite.
When the mode control terminal BootLoader of the embedded multimedia device MP5 is a high level signal, the embedded multimedia device enters a normal operating mode after being powered on, and when the mode control terminal BootLoader of the embedded multimedia device MP5 is a low level signal, the embedded multimedia device enters a program downloading mode after being powered on. The mode control apparatus 100 includes a signal control circuit 110 and a response receiving circuit 120. The signal control circuit 110 includes a detection circuit 111 and a signal output circuit 112.
The detection circuit 111 is connected with the programmer through the USB connector and detects whether the level of the signal output end of the USB connector is inverted.
One end of the signal output circuit 112 is connected to the detection circuit 111, the other end of the signal output circuit 112 is connected to the mode control terminal BootLoader of the embedded multimedia device, and when the detection circuit 111 detects that the level of the signal output end of the USB connector 300 is inverted, the signal output circuit 112 outputs a preset level signal to the mode control terminal BootLoader of the embedded multimedia device 200, so that the embedded multimedia device 200 enters a program downloading mode. Generally, the predetermined level signal is a low level signal, but not limited thereto.
In the present embodiment, the mode control device 100 employs a vehicle controller EPU that includes a detection circuit 111 and a signal output circuit 112 inside. The detection circuit 111 is connected to the programmer 400 (generally, a computer) via the USB connector 300, one end of the signal output circuit 112 is connected to the detection circuit 111, and the other end is connected to the embedded multimedia device 200. When the signal output circuit 112 detects that the level of the signal output end of the USB connector 300 is inverted, the signal output circuit 112 outputs a preset level signal to the mode control end BootLoader of the embedded multimedia device 200, so that the embedded multimedia device 200 enters a program downloading mode.
The USB connector 300 has a built-IN chip, and as shown IN fig. 3, when detecting that the three USB signals USB _ POW, USB _ CTL1, and USB _ CTL2 are all at high level, the signal output terminal VUSB _ IN of the USB outputs a high level signal, otherwise outputs a low level signal. The embedded multimedia device MP5 may enter the CDP mode, i.e., the program download mode, as shown in table 1 below.
TABLE 1
| USB_POW | USB_CTL1 | USB_CTL2 | USB_CTL3 | MODE | Description of the invention | |
| 0 | | X | 1 | |
||
| 1 | 0 | 0 | 1 | DCP (charging only) | ||
| 1 | 1 | 1 | 1 | CDP | Program download mode |
When the signal control circuit 110 detects that the level of the signal output end VUSB _ IN of the USB connector 300 is inverted, the signal control circuit 110 outputs a low level signal to make the BootLoader signal end of the embedded multimedia device MP5 be at a low level, and the embedded multimedia device MP5 enters a program downloading mode to update the program.
As shown in fig. 4, after the BootLoader of the mode control terminal of the embedded multimedia device MP5 is pulled to a low level signal first, the power source terminal VCC of the embedded multimedia device MP5 is powered up again, and the program downloading mode is entered.
One end of the response receiving circuit 120 is connected to the embedded multimedia device 200, the other end is connected to the signal control circuit 110, the response receiving circuit 120 receives the response signal from the embedded multimedia device 200 and then sends the response signal to the signal control circuit 110, and the signal control circuit 110 stops outputting the preset level signal, so that the embedded multimedia device 200 directly enters the normal operating mode after the program is downloaded.
The technical scheme that this embodiment provided directly uses microcontroller EPU on the vehicle to realize commercial car embedded multimedia device's automatic mode conversion, and the automatic update program that downloads has overcome in the past when downloading the program and need artificially pull down the inconvenient of signal end, and local materials are with low costs, have improved convenient to use nature and program update efficiency.
Fig. 5 is a functional block diagram of another mode control device according to an embodiment of the present disclosure.
As shown in fig. 5, in the present embodiment, a monostable controller is used as a mode control device to perform mode control of the embedded multimedia device, the monostable controller is a newly added circuit, the circuit is simple, the application is convenient, and the method can be widely applied to a vehicle with or without a microcontroller EPU.
The mode control apparatus 100 is used for mode control of the embedded multimedia device 200, and the embedded multimedia device 200 includes a program download mode and a normal operation mode, in which BootLoader level signals of the mode control terminal of the embedded multimedia device 200 are opposite. The mode control device 100 includes a signal control circuit 110 and a delay circuit 120. The signal control circuit 110 employs a monostable circuit.
One end of the signal control circuit 110 is connected to the programmer 400 (generally, a computer) via the USB connector 300, and the other end is connected to the embedded multimedia device 200. When the signal control circuit detects that the level of the signal output end of the USB connector 300 is inverted, the signal control circuit 110 outputs a preset level signal to the mode control end BootLoader of the embedded multimedia device 200, so that the embedded multimedia device 200 enters a program downloading mode.
Generally, the predetermined level signal is a low level signal, but not limited thereto.
The USB connector 300 has a built-IN chip, and as shown IN fig. 4, when detecting that the three USB signals USB _ POW, USB _ CTL1, and USB _ CTL2 are all at high level, the signal output terminal VUSB _ IN of the USB outputs a high level signal, otherwise outputs a low level signal. The embedded multimedia device MP5 may enter CDP mode, i.e., program download mode.
Taking a monostable circuit as an example, when the signal control circuit 110 detects that the level of the signal output end VUSB _ IN of the USB connector 300 is inverted, the signal control circuit 110 outputs a low level signal to make the mode control end BootLoader of the embedded multimedia device MP5 low, and the embedded multimedia device MP5 enters a program downloading mode after being powered on to perform program updating.
As shown in fig. 5, the monostable circuit includes a first resistor R and a switching tube N. The first resistor R has a first terminal connected to the signal output terminal VUSB _ IN of the USB connector and a second terminal connected to the power ground. The control end of the switch tube N is connected with the signal output end VUSB _ IN of the USB connector, the first end of the switch tube N is connected with the preset level signal end, and the second end of the switch tube N is connected with the power ground.
Optionally, the monostable circuit further includes a diode D connected in anti-parallel across the first resistor R.
Optionally, the monostable further includes a delay circuit. The delay circuit is connected to the signal control circuit, and after entering the program downloading mode for a delay preset time, the control signal control circuit 110 stops outputting the preset level signal, so that the embedded multimedia device 200 directly enters the normal operating mode after the program downloading is completed.
The delay circuit comprises a first capacitor C1 and a second resistor R2 which are connected in series, and the delay time can be changed by changing the product of the capacitance value of the first capacitor and the resistance value of the second resistor.
The voltage waveform at the monostable point is shown in figure 6. When the level of VUSB _ IN is inverted, the BootLoader of the mode control terminal of the embedded multimedia device 200 is pulled to a low level signal, and the low level signal is maintained for a certain time to power on the embedded multimedia device 200 to complete the program programming.
Specifically, taking the embedded multimedia device MP5 as an example, the programming procedure is started after the monostable circuit maintains outputting the low level state for 30 seconds, and generally the programming takes 120 seconds, so the programming is delayed for 120 seconds after maintaining the low level state for 30 seconds, the output of the low level is stopped, the corresponding signal terminal of the embedded multimedia device MP5 automatically releases and changes to the high level signal, and the normal operation mode is entered.
The plug-in and plug-out process of the USB connector is simulated, the voltage waveform of the mode control terminal BootLoader is shown in figure 7, when the USB connector is plugged in, the mode control terminal BootLoader timely inverts to a low level signal, and therefore the timeliness of the mode control terminal BootLoader responding to the inversion of the level signal when the USB connector is plugged in is confirmed.
The technical scheme provided by the embodiment adopts the additional monostable circuit to realize the automatic mode conversion of the embedded multimedia equipment of the commercial vehicle, automatically downloads the updating program, overcomes the inconvenience that the signal end needs to be artificially lowered when the program is downloaded in the prior art, has simple circuit and wide application range, and improves the use convenience and the program updating efficiency.
Fig. 8 is a flowchart illustrating a mode control method for mode control of an embedded multimedia device according to an embodiment of the present application.
In S10, the signal control circuit detects whether or not the level of the signal output terminal of the USB connector is inverted.
When a programmer (computer end) writes a program to the embedded multimedia equipment, the USB connector is connected with the computer end, and a chip arranged IN the USB connector can enable the level of a signal output end VUSB _ IN of the USB connector to be inverted. The signal control circuit detects that the level of the signal output terminal VUSB _ IN of the USB connector is inverted.
In S20, when the signal control circuit detects that the level of the signal output terminal of the USB connector is inverted, it outputs a preset level signal to the mode control terminal BootLoader of the embedded multimedia device, so that the embedded multimedia device enters a program downloading mode after being powered on.
In S30, after delaying the preset time or receiving the response signal from the embedded multimedia device, the signal control circuit stops outputting the preset level signal, so that the embedded multimedia device directly enters the normal operating mode after the program is downloaded.
According to the technical scheme provided by the embodiment of the application, the embedded multimedia equipment realizes automatic mode conversion and downloads the updating program through the external device, the use is convenient, and the program updating efficiency is improved.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.
Claims (11)
1. A mode control device is used for mode control of an embedded multimedia device, the embedded multimedia device comprises a program downloading mode and a normal working mode, in the two modes, the level signals of a mode control end of the embedded multimedia device are opposite, and the mode control device comprises:
and one end of the signal control circuit is connected with the programmer through the USB connector, the other end of the signal control circuit is connected with the embedded multimedia equipment, and when the signal control circuit detects that the level of the signal output end of the USB connector is turned, the signal control circuit outputs a preset level signal to the mode control end of the embedded multimedia equipment to control the turning of the level signal of the mode control end, so that the embedded multimedia equipment enters a program downloading mode after being electrified.
2. The mode control apparatus of claim 1, wherein the preset level signal comprises a low level signal.
3. The mode control apparatus of claim 1, further comprising:
and one end of the response receiving circuit is connected with the embedded multimedia equipment, the other end of the response receiving circuit is connected with the signal control circuit, the response receiving circuit receives a response signal from the embedded multimedia equipment and then sends the response signal to the signal control circuit, and the signal control circuit stops outputting the preset level signal, so that the embedded multimedia equipment directly enters a normal working mode after the program downloading is finished.
4. The mode control apparatus of claim 1, further comprising:
and the delay circuit is connected with the signal control circuit, controls the signal control circuit to stop outputting the preset level signal after entering a program downloading mode for delaying for a preset time, and enables the embedded multimedia equipment to directly enter a normal working mode after the program downloading is finished.
5. The mode control apparatus of claim 1, wherein the signal control circuit comprises:
the detection circuit is connected with the programmer through the USB connector and is used for detecting whether the level of the signal output end of the USB connector is turned over or not;
and one end of the signal output circuit is connected with the detection circuit, the other end of the signal output circuit is connected with a mode control end of the embedded multimedia equipment, and when the detection circuit detects that the level of the signal output end of the USB connector is turned over, the signal output circuit outputs the preset level signal to the mode control end, so that the embedded multimedia equipment enters a program downloading mode.
6. The mode control apparatus of claim 1, wherein the signal control circuit comprises a monostable circuit.
7. The mode control apparatus of claim 6, wherein the monostable circuit comprises:
the first end of the first resistor is connected to the signal output end of the USB connector, and the second end of the first resistor is connected to a power ground;
and the control end of the switch tube is connected with the signal output end of the USB connector, the first end of the switch tube is connected with a preset level signal end, and the second end of the switch tube is connected with the power ground.
8. The mode control apparatus of claim 7, wherein the monostable further comprises:
and the diode is connected in reverse parallel to two ends of the first resistor.
9. The mode control apparatus of claim 2, wherein the delay circuit comprises:
the delay time can be changed by changing the product of the capacitance value of the first capacitor and the resistance value of the second resistor.
10. A control method of the mode control apparatus of any one of claims 1 to 9, applied to the mode control of an embedded multimedia device, the control method comprising:
when the embedded multimedia equipment is powered on and enters a normal working mode, the signal control circuit detects whether the level of the signal output end of the USB connector is turned over;
when the level of the signal output end of the USB connector is turned over, the signal control circuit outputs a preset level signal to the mode control end of the embedded multimedia equipment, so that the embedded multimedia equipment enters a program downloading mode.
11. The control method according to claim 10, further comprising:
and after delaying preset time or receiving a response signal from the embedded multimedia equipment, the signal control circuit stops outputting the preset level signal, so that the embedded multimedia equipment directly enters a normal working mode after the program downloading is finished.
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