CN111010524B - VGA video signal screen capture device and screen capture method - Google Patents
VGA video signal screen capture device and screen capture method Download PDFInfo
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Abstract
The invention provides a VGA video signal screen capture device and a screen capture method, comprising a VGA signal acquisition processing module and a VGA interface used for connecting an external host; the VGA signal acquisition processing module is connected with a VGA interface used for connecting an external host through a VGA signal wire; the VGA signal acquisition processing module is connected with a key, and the key is used for triggering the VGA signal acquisition processing module to acquire VGA data signals; the VGA signal acquisition and processing module is also used for processing the acquired data and outputting the processed data. The invention does not depend on the operating system and BIOS of the host computer, collect VGA signal directly, can carry on the screen capture operation at any time; the invention is triggered by the key, so the operation is simple; the invention does not use shooting equipment, thereby avoiding secret divulgence during shooting; and the USB interface resource of the host is not occupied.
Description
Technical Field
The invention relates to the technical field of video signal frequency interception, in particular to a VGA video signal screen interception device and a screen interception method.
Background
Servers are devices used to provide highly reliable computing services, and have high requirements on processing power, stability, reliability, security, scalability, manageability, and the like. However, the server generally has low requirements for display functions, and usually selects a BMC to be used as a display chip to output VGA video signals. The display function of the server is mainly used in the stages of system installation, debugging and testing, and the current working state of the server is obtained through a picture displayed on a screen. Many times, it is desirable to save the current screen display for recording or for off-site personnel to review and analyze.
The existing means for obtaining the current operating state of the server through the screen displayed on the screen includes the following modes: shooting a screen by using equipment with a shooting function, such as a mobile phone and a camera; using screen capturing software or inputting a screen capturing instruction in an operating system; and a keyboard key screen capturing function is used on the BIOS interface.
The prior art has the following defects: in part of scenes with confidential requirements, equipment with a shooting function is carried into the scenes, so that the risk of disclosure of confidential images in places exists; the requirement on the state of an operating system and the capability of an operator is high: the system is required to be normally started, and an operator can operate screen capturing software or input a screen capturing instruction; depending on the BIOS related functions: and a keyboard key is used for screen capturing on a BIOS interface, and the premise is that the BIOS of the mainboard has a screen capturing function, and if the BIOS does not have the function, the BIOS cannot be used.
Disclosure of Invention
The invention provides a VGA video signal screen capture device and a screen capture method, aiming at the problems that in part of scenes with confidential requirements, equipment with a shooting function enters, so that the risk of confidential image leakage in a place exists, the requirement on the state of an operating system is high, the requirement on the capability of an operator is high, and the device is dependent on the related functions of a BIOS and cannot be used if the BIOS does not have the functions.
The technical scheme of the invention is as follows:
on one hand, the technical scheme of the invention provides a VGA video signal screen capture device, which comprises a VGA signal acquisition and processing module and a VGA interface used for connecting an external host;
the VGA signal acquisition processing module is connected with a VGA interface used for connecting an external host through a VGA signal wire; the VGA signal acquisition processing module is connected with a key, and the key is used for triggering the VGA signal acquisition processing module to acquire VGA data signals;
the VGA signal acquisition and processing module is also used for processing the acquired data and outputting the processed data.
Preferably, the VGA signal acquiring and processing module comprises a CPLD chip, an ADC sampling chip and a memory;
the CPLD chip is respectively connected with the ADC sampling chip and the memory; the ADC sampling chip is also used for controlling the ADC sampling chip to acquire VGA signals of an external host;
the ADC sampling chip is connected with the VGA interface through a VGA signal line;
the ADC sampling chip is used for outputting the acquired data to the CPLD chip for data processing;
and the CPLD chip is used for processing the received data into picture data and storing the picture data into the memory.
Preferably, the VGA signal acquiring and processing module further comprises a FIFO memory buffer module and a clock module;
the CPLD chip is connected with the clock module and is used for outputting a clock signal to the ADC sampling chip to control the sampling time;
the ADC sampling chip is connected with the FIFO storage buffer module and is used for outputting the acquired data to the FIFO storage buffer module;
the CPLD chip is connected with the FIFO memory buffer module and controls writing or reading data into the FIFO memory buffer module.
Preferably, the key is connected with the CPLD chip through the key detection circuit module;
and the key detection circuit module is used for converting the key action into an interrupt input signal of the CPLD chip.
Preferably, the device also comprises a power supply conversion module, wherein the power supply conversion module is connected with the VGA signal acquisition and processing module;
the power supply conversion module is connected with a power supply interface, the output end of the power supply interface is connected with the power supply conversion module, and the input end of the power supply interface is connected to an external power supply;
or the power supply conversion module is connected with a second USB interface and is used for connecting with a USB interface of an external host to get power from the externally connected host;
or, the power conversion module is connected with a second USB interface and a power interface, the output end of the power interface is connected with the power conversion module, the input end of the power interface is connected to an external power supply, and the second USB interface is used for being connected with a USB interface of an external host to get electricity from the externally connected host.
Preferably, in order to prevent the device from occupying interface resources of the external host after being connected with the external host and influencing the normal connection of the host and the peripheral, the device comprises a third USB interface and a VGA interface for connecting an external display; the third USB interface is connected with the power supply conversion module;
the VGA interface used for connecting an external host and the VGA interface used for connecting an external display are connected through VGA signal lines; the VGA interface resource of the host is not occupied, and the original VGA display can normally display the VGA image; does not depend on the state of the host;
the VGA signal acquisition processing module is connected to the VGA signal wire;
when the second USB interface is inserted into the USB interface of the host, the second USB interface has the function of the USB interface of the host; the second USB interface is connected with the third USB interface to transfer the USB function of the host to the third USB interface. The second USB interface and the power interface are both used as power input interfaces of the device; when the host USB and the external power supply are connected at the same time, the load capacity of the third USB port can be enhanced;
preferably, the device further comprises a signal measurement interface, a channel switching module and an impedance matching module;
the channel switching module is arranged on a VGA signal line between a VGA interface used for connecting an external host and a VGA interface used for connecting an external display;
the channel switching module is respectively connected with the ADC sampling chip and the signal measurement interface;
the CPLD chip is connected with the channel switching module and is used for controlling the channel switching module to switch the sampling channel and the measuring channel;
the signal measurement interface is used for serving as a signal test connection point;
the impedance matching module is connected to a VGA signal wire between the channel switching module and a VGA interface for connecting an external display through a switch; the circuit is used for disconnecting the VGA signal line from the impedance matching module through the control switch when the display is connected; when the display is not connected, the VGA signal wire is connected with the impedance matching module through the control switch.
Preferably, the device further comprises a first USB interface, the VGA signal acquisition processing module further comprises a USB module, the first USB interface is connected with the CPLD chip through the USB module, and the USB module is used for establishing communication between the CPLD chip and a USB storage device externally connected to the first USB interface; and the CPLD chip controls the picture data after signal processing to be output to an external USB storage device through the first USB interface.
On the other hand, the technical scheme of the invention also provides a VGA video signal screen capturing method, which comprises the following steps:
step 101: the CPLD chip receives an interrupt signal triggered by a key;
step 102: the CPLD chip detects the frame synchronization pulse signal, if the frame synchronization pulse signal is detected, the step 103 is executed, otherwise, the detection of the frame synchronization pulse signal is continued;
step 103: the CPLD chip starts a frame synchronization signal timer and simultaneously starts an ADC chip and starts a FIFO storage buffer module to write;
step 104: the ADC chip collects pixel data of the VGA signal and writes the collected pixel data into the FIFO storage buffer module;
step 105: judging whether the frame synchronization signal is acquired, if so, executing step 106; otherwise, executing step 104 to collect pixel data of next line of VGA signal and writing the collected pixel data into FIFO memory buffer module;
step 106: the CPLD chip closes the write-in operation of the FIFO memory buffer module and simultaneously closes the ADC chip and empties the memory;
step 107: the CPLD chip starts the reading operation of the FIFO memory buffer module and reads out data in a frame synchronization period;
step 108: the CPLD chip processes the read data to generate picture data and stores the picture data in a memory;
step 109: the CPLD chip scans whether a USB flash disk is inserted into the first USB interface, if not, the first USB interface is continuously scanned, otherwise, the step 110 is executed;
step 110: and saving the picture data into the USB flash disk.
Further, in step 105, the implementation manner of the step of determining whether the frame synchronization signal is acquired is as follows:
the CPLD chip judges whether the frame synchronization signal timer reaches a set time, if so, the signal acquisition is finished, otherwise, the signal acquisition is not finished; or
And the CPLD chip judges whether the pulse signal of the frame synchronization signal reaches a falling edge, if so, the signal acquisition is finished, otherwise, the signal acquisition is not finished.
According to the technical scheme, the invention has the following advantages: capturing a screen by triggering a key; the invention does not depend on the operating system and BIOS of the host computer, collect VGA signal directly, can carry on the screen capture operation at any time; the invention is triggered by the key, so the operation is simple; the invention does not use shooting equipment, thereby avoiding secret divulgence during shooting; the USB interface resource of the host is not occupied, and when the host USB is connected through the second USB interface and the external power supply is connected through the power supply interface, the load carrying capacity of the switching USB interface (the third USB interface) can be enhanced. The invention provides a VGA signal measurement interface, which can be used for hardware engineers to simultaneously measure VGA signals.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a connection block diagram of a VGA video signal screenshot device according to a second embodiment of the present invention.
Fig. 2 is a connection block diagram of a VGA video signal screenshot device according to a second embodiment of the present invention.
Fig. 3 is a connection block diagram of a VGA video signal screenshot system according to a third embodiment of the present invention.
Fig. 4 is a flowchart of a VGA video signal screenshot method according to a fourth embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. 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 invention.
The 5-line synchronous VGA signal comprises R/G/B tricolor signal and field (Vsync) line (Hsync) synchronous signal. The three waveforms of R/G/B in one line period correspond to pixels of 1 line on the display, the amplitude of the waveform in each reference clock period represents the brightness of the color of the corresponding pixel point, and the waveform in one field period corresponds to an image of 1 frame of the display. The VGA signal time sequence comprises a front porch, a synchronous pulse, a rear porch and an effective pixel. For a VGA signal of fixed resolution and frequency, the duration of the front porch, sync pulse, back porch, active pixels is fixed. For example, for a VGA signal of 1024X 768 resolution/60 Hz/pixel frequency of 65MHz, one reference clock period is 1s/65MHz, and one reference clock period corresponds to one pixel; in one line period, the front corridor is 3 reference clock periods, the synchronous pulse is 6 reference clock periods, the rear corridor is 29 reference clock periods, and the effective pixel is 768 reference clock periods; in one field period, the front porch is 32 lines, the sync pulse is 136 lines, the back porch is 160 lines, and the effective pixels are 1024 lines.
Example one
The technical scheme of the invention provides a VGA video signal screen capture device, which comprises a VGA signal acquisition and processing module and a VGA interface used for connecting an external host; the VGA signal acquisition processing module is connected with a VGA interface used for connecting an external host through a VGA signal wire; the VGA signal acquisition processing module is connected with a key, and the key is used for triggering the VGA signal acquisition processing module to acquire VGA data signals; the VGA signal acquisition and processing module is also used for processing the acquired data and outputting the processed data. The screen is shot by triggering the key one key, so that the operation is simple; the invention does not use shooting equipment, thereby avoiding secret divulgence during shooting.
Example two
As shown in fig. 1 and 2, the technical solution of the present invention provides a VGA video signal screenshot device, which includes a VGA signal acquisition processing module and a VGA interface for connecting an external host; the VGA signal acquisition processing module is connected with a VGA interface used for connecting an external host through a VGA signal wire; the VGA signal acquisition processing module is connected with a key, and the key is used for triggering the VGA signal acquisition processing module to acquire VGA data signals;
in this embodiment, the VGA signal acquiring and processing module includes a CPLD chip, an ADC sampling chip and a memory; the CPLD chip is used as a main control chip, and the high-speed ADC sampling chip is used for establishing an R/G/B sampling circuit;
the CPLD chip is respectively connected with the ADC sampling chip and the memory; the ADC sampling chip is connected with the VGA interface through a VGA signal line; the CPLD chip is used for controlling the ADC sampling chip to acquire VGA signals of an external host; the ADC sampling chip is used for outputting the acquired data to the CPLD chip for data processing; the CPLD chip is used to process the received data into picture data and store the picture data into the memory, which is an EEPROM in this embodiment.
The VGA signal acquisition and processing module also comprises an FIFO storage buffer module and a clock module; the CPLD chip is connected with the clock module and used for outputting a clock signal to the ADC sampling chip to control the sampling time, and the clock module is used for providing a stable high-frequency clock signal; the ADC sampling chip is connected with the FIFO storage buffer module and is used for outputting the acquired data to the FIFO storage buffer module; the CPLD chip is connected with the FIFO memory buffer module and controls writing or reading data into the FIFO memory buffer module. The key is connected with the CPLD chip through the key detection circuit module; and the key detection circuit module is used for converting the key action into an interrupt input signal of the CPLD chip.
The device in the embodiment also comprises a power supply conversion module, wherein the power supply conversion module is connected with the VGA signal acquisition and processing module;
the power supply conversion module is connected with a second USB interface and is used for connecting with a USB interface of an external host to get power from the externally connected host; in order to prevent the device from occupying interface resources of an external host after being connected with the external host and influencing the normal connection of the host and a peripheral, the device comprises a third USB interface and a VGA interface for connecting an external display; the third USB interface is connected with the power supply conversion module;
the VGA interface used for connecting an external host and the VGA interface used for connecting an external display are connected through VGA signal lines; the VGA interface resource of the host is not occupied, and the original VGA display can normally display the VGA image; does not depend on the state of the host;
the VGA signal acquisition processing module is connected to the VGA signal wire;
when the second USB interface is inserted into the USB interface of the host, the second USB interface has the function of the USB interface of the host; the second USB interface is connected with the third USB interface to transfer the USB function of the host to the third USB interface.
The device also comprises a first USB interface, the VGA signal acquisition processing module also comprises a USB module, the first USB interface is connected with the CPLD chip through the USB module, and the USB module is used for establishing the communication between the CPLD chip and a USB storage device externally connected with the first USB interface; and the CPLD chip controls the picture data after signal processing to be output to an external USB storage device (U disk) through a first USB interface.
EXAMPLE III
As shown in fig. 3, the technical solution of the present invention provides a VGA video signal screenshot device, which is different from the VGA video signal screenshot device provided in the first embodiment in that:
the power conversion module is connected with a second USB interface and a power interface, the output end of the power interface is connected with the power conversion module, the input end of the power interface is connected to an external power supply, and the second USB interface is used for being connected with a USB interface of an external host to obtain electricity from the externally connected host. The second USB interface and the power interface are both used as power input interfaces of the device; when the host USB and the external power supply are connected at the same time, the load carrying capacity of the third USB port can be enhanced.
The device in the embodiment also comprises a signal measurement interface, a channel switching module and an impedance matching module;
the channel switching module is arranged on a VGA signal line between a VGA interface used for connecting an external host and a VGA interface used for connecting an external display;
the channel switching module is respectively connected with the ADC sampling chip and the signal measurement interface; in this embodiment, the channel switching module uses a switch (or a pin and a jumper cap) to switch whether the VGA signal line (R/G/B/Hsync/Vsync) is connected to the VGA signal acquisition processing module. When the waveform of the signal measurement interface is tested, the VGA signal wire is disconnected with the VGA signal acquisition and processing module; when the screenshot is carried out, the VGA signal wire is connected with the VGA signal acquisition and processing module.
The CPLD chip is connected with the channel switching module and is used for controlling the channel switching module to switch the sampling channel and the measuring channel;
the signal measurement interface is used for serving as a signal test connection point; the impedance matching module is connected to a VGA signal wire between the channel switching module and a VGA interface for connecting an external display through a switch; the impedance matching module uses a switch (or a contact pin and a jumper cap) to switch whether the VGA signal wire is connected with the impedance matching module; when the display is connected, the VGA signal line is disconnected with the impedance matching module through the control switch; when the display is not connected, the VGA signal wire is connected with the impedance matching module through the control switch.
Example four
As shown in fig. 4, an embodiment of the present invention provides a method for capturing a VGA video signal, where the method captures a video signal after the device in the above embodiment is connected to a host, that is, the device is turned on, and includes the following steps:
step 101: the CPLD chip receives an interrupt signal triggered by a key;
step 102: the CPLD chip detects a frame synchronization pulse signal, if the frame synchronization pulse signal is detected, step 103 is executed, otherwise, step 102 is continued;
step 103: the CPLD chip starts a frame synchronization signal timer and simultaneously starts an ADC chip and starts a FIFO storage buffer module to write;
step 104: the ADC chip collects pixel data of the VGA signal and writes the collected pixel data into the FIFO storage buffer module;
step 105: judging whether the frame synchronization signal is acquired, if so, executing step 106; otherwise, executing step 104 to collect pixel data of next line of VGA signal and writing the collected pixel data into FIFO memory buffer module; in the embodiment, whether the frame synchronization signal timer reaches the set time is judged, if so, the signal acquisition is finished, otherwise, the signal acquisition is not finished;
step 106: the CPLD chip closes the write-in operation of the FIFO memory buffer module and simultaneously closes the ADC chip and empties the memory;
step 107: the CPLD chip starts the reading operation of the FIFO memory buffer module and reads out data in a frame synchronization period;
step 108: the CPLD chip processes the read data to generate picture data and stores the picture data in a memory;
step 109: the CPLD chip scans whether a USB flash disk is inserted into the first USB interface, if not, the first USB interface is continuously scanned, otherwise, the step 110 is executed;
step 110: and saving the picture data into the USB flash disk.
EXAMPLE five
The embodiment of the invention provides a VGA video signal screenshot method, which is different from the third embodiment in that:
when the CPLD chip determines whether the frame synchronization signal is completely acquired, in this embodiment, by determining whether the pulse signal of the frame synchronization signal reaches the falling edge, if so, the signal acquisition is completed, otherwise, the signal acquisition is not completed.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A VGA video signal screen capture device is characterized by comprising a VGA signal acquisition and processing module and a VGA interface used for connecting an external host;
the VGA signal acquisition processing module is connected with a VGA interface used for connecting an external host through a VGA signal wire; the VGA signal acquisition processing module is connected with a key, and the key is used for triggering the VGA signal acquisition processing module to acquire VGA data signals;
the VGA signal acquisition processing module is also used for processing the acquired data and outputting the processed data;
the VGA signal acquisition processing module comprises a CPLD chip, an ADC sampling chip and a memory;
the CPLD chip is respectively connected with the ADC sampling chip and the memory;
the ADC sampling chip is connected with the VGA interface through a VGA signal line;
the CPLD chip is used for controlling the ADC sampling chip to acquire VGA signals of an external host; the image processing device is also used for processing the received data into image data and storing the image data into the memory;
the ADC sampling chip is used for outputting the acquired data to the CPLD chip for data processing;
the device also comprises a VGA interface used for connecting an external display, a signal measuring interface, a channel switching module and an impedance matching module;
the channel switching module is arranged on a VGA signal line between a VGA interface used for connecting an external host and a VGA interface used for connecting an external display;
the channel switching module is respectively connected with the ADC sampling chip and the signal measurement interface;
the CPLD chip is connected with the channel switching module and is used for controlling the channel switching module to switch the sampling channel and the measuring channel;
the signal measurement interface is used for serving as a signal test connection point;
the impedance matching module is connected to a VGA signal wire between the channel switching module and a VGA interface for connecting an external display through a switch; the circuit is used for disconnecting the VGA signal line from the impedance matching module through the control switch when the display is connected; when the display is not connected, the VGA signal wire is connected with the impedance matching module through the control switch.
2. The VGA video signal screen capture device of claim 1, wherein the VGA signal acquisition and processing module further comprises a FIFO memory buffer module and a clock module;
the CPLD chip is connected with the clock module and is used for outputting a clock signal to the ADC sampling chip to control the sampling time;
the ADC sampling chip is connected with the FIFO storage buffer module and is used for outputting the acquired data to the FIFO storage buffer module;
the CPLD chip is connected with the FIFO memory buffer module and controls writing or reading data into the FIFO memory buffer module.
3. The VGA video signal screen capture device according to claim 1, wherein the key is connected with the CPLD chip through the key detection circuit module;
and the key detection circuit module is used for converting the key action into an interrupt input signal of the CPLD chip.
4. The VGA video signal screen capture device according to claim 1, further comprising a power conversion module, wherein the power conversion module is connected with the VGA signal acquisition and processing module;
the power supply conversion module is connected with a power supply interface, the output end of the power supply interface is connected with the power supply conversion module, and the input end of the power supply interface is connected to an external power supply;
or the power supply conversion module is connected with a second USB interface and is used for connecting with a USB interface of an external host to get power from the externally connected host;
or, the power conversion module is connected with a second USB interface and a power interface, the output end of the power interface is connected with the power conversion module, the input end of the power interface is connected to an external power supply, and the second USB interface is used for being connected with a USB interface of an external host to get electricity from the externally connected host.
5. The VGA video signal screen capture device of claim 4, wherein the device further comprises a third USB interface; the third USB interface is connected with the power supply conversion module;
the VGA interface used for connecting an external host and the VGA interface used for connecting an external display are connected through VGA signal lines;
the VGA signal acquisition processing module is connected to the VGA signal wire;
when the second USB interface is inserted into the USB interface of the host, the second USB interface has the function of the USB interface of the host; the second USB interface is connected with the third USB interface to transfer the USB function of the host to the third USB interface.
6. The VGA video signal screen capture device according to claim 1, wherein the device further comprises a first USB interface, the VGA signal acquisition processing module further comprises a USB module, the first USB interface is connected with the CPLD chip through the USB module, and the USB module is used for establishing communication between the CPLD chip and a USB storage device externally connected with the first USB interface; and the CPLD chip controls the picture data after signal processing to be output to an external USB storage device through the first USB interface.
7. A VGA video signal screen capture method, characterized by that this method is based on a VGA video signal screen capture device of claim 1, VGA signal acquisition processing module in this apparatus also includes FIFO stores buffer module and clock module; the CPLD chip is connected with the clock module and is used for outputting a clock signal to the ADC sampling chip to control the sampling time; the ADC sampling chip is connected with the FIFO storage buffer module and is used for outputting the acquired data to the FIFO storage buffer module; the CPLD chip is connected with the FIFO memory buffer module and controls the writing or reading of data into the FIFO memory buffer module; the device also comprises a first USB interface, the VGA signal acquisition processing module also comprises a USB module, the first USB interface is connected with the CPLD chip through the USB module, and the USB module is used for establishing the communication between the CPLD chip and a USB storage device externally connected with the first USB interface; the CPLD chip controls the picture data after signal processing to be output to an external USB storage device through a first USB interface;
the method comprises the following steps:
step 101: the CPLD chip receives an interrupt signal triggered by a key;
step 102: the CPLD chip detects the frame synchronization pulse signal, if the frame synchronization pulse signal is detected, the step 103 is executed, otherwise, the detection of the frame synchronization pulse signal is continued;
step 103: the CPLD chip starts a frame synchronization signal timer and simultaneously starts an ADC chip and starts a FIFO storage buffer module to write;
step 104: the ADC chip collects pixel data of the VGA signal and writes the collected pixel data into the FIFO storage buffer module;
step 105: judging whether the frame synchronization signal is acquired, if so, executing step 106; otherwise, executing step 104 to collect pixel data of next line of VGA signal and writing the collected pixel data into FIFO memory buffer module;
step 106: the CPLD chip closes the write-in operation of the FIFO memory buffer module and simultaneously closes the ADC chip and empties the memory;
step 107: the CPLD chip starts the reading operation of the FIFO memory buffer module and reads out data in a frame synchronization period;
step 108: the CPLD chip processes the read data to generate picture data and stores the picture data in a memory;
step 109: the CPLD chip scans whether a USB flash disk is inserted into the first USB interface, if not, the first USB interface is continuously scanned, otherwise, the step 110 is executed;
step 110: and saving the picture data into the USB flash disk.
8. The method according to claim 7, wherein in step 105, the step of determining whether the frame synchronization signal is completely captured is implemented by:
the CPLD chip judges whether the frame synchronization signal timer reaches a set time, if so, the signal acquisition is finished, otherwise, the signal acquisition is not finished; or
And the CPLD chip judges whether the pulse signal of the frame synchronization signal reaches a falling edge, if so, the signal acquisition is finished, otherwise, the signal acquisition is not finished.
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