CN111124985A - Read-only control method and device for mobile terminal - Google Patents
Read-only control method and device for mobile terminal Download PDFInfo
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- CN111124985A CN111124985A CN201911347361.2A CN201911347361A CN111124985A CN 111124985 A CN111124985 A CN 111124985A CN 201911347361 A CN201911347361 A CN 201911347361A CN 111124985 A CN111124985 A CN 111124985A
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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
Abstract
The invention discloses a method for enumerating USB equipment of a computer end under the condition that the computer end detects the access of a mobile terminal, wherein a main control module analyzes an NVMe communication protocol, an AHCI protocol and a USB communication protocol and reads the data of the mobile terminal; the main control module analyzes a control instruction of the USB equipment; if the control instruction is a write instruction, returning an effective value to the computer end, and not executing the write instruction; if the control command is a read command, the data is sent to the computer end through a transmission mechanism of the micro-frame and the FIFO. The number of the buffers and the buffering time can be greatly reduced through a transmission mechanism of matching the micro frames with the FIFO, the hardware cost can be reduced, and the transmission rate is improved. By analyzing the NVMe communication protocol and the USB communication protocol, the NVMe memory can be conveniently accessed on various operating system platforms through the USB. And the USB3.0 standard communication protocol is supported, the reading and writing speed is high, transmission interruption or data incompleteness can be avoided when data is transmitted at high speed, and the transmission is efficient and stable.
Description
Technical Field
The invention relates to the field of data acquisition, in particular to a read-only control method and device for a mobile terminal.
Background
At present, with the rapid development of national economy in China, mobile terminals such as mobile phones and notebooks become an indispensable part in daily life, cases of using the mobile terminals for illegal use are more and more, and data storage media of the terminals mostly mainly adopt M.2 mobile terminals. Therefore, data of the M.2 mobile terminal can be read quickly, original data can be protected in the reading process, equipment for enabling the part of data to have judicial validity is an indispensable part in electronic data forensics at present, and the equipment has very large and urgent requirements in the forensics process.
The read-only equipment of the same type on the market at present mainly adopts the scheme of an FPGA, the FPGA configures a DMA transmission state machine integrated with the read-only equipment, the DMA comprises read operation, write protection operation and arbitration, whether the DMA is in an idle state currently is judged by reading a DMA information identifier, DMA control information is read from the inside, and the read-only function is realized. However, the scheme has the defects of complex hardware structure, large volume, high cost, difficulty in carrying and the like.
At present, the communication bandwidth of USB3.0 devices in the market is 5Gb/s, and a bridge is used as a device for data relay transmission (a point a receives data and transmits the data to a point b), and if a traditional large cache mechanism is used, the bandwidth utilization rate can only reach half of that of 2.5G/s.
Aiming at the defects in the market, the invention discloses a read-only control method and a read-only control device of a mobile terminal, which are low in cost, high in speed and easy to carry, so as to solve the existing problems.
Disclosure of Invention
In view of the above-mentioned problems of high cost, large volume, complex structure, slow transmission, incapability of making data have judicial validity, and the like of the mobile terminal read-only device, an embodiment of the present application aims to provide a mobile terminal read-only control method, apparatus, and storage medium to solve the technical problems mentioned in the background section above.
According to one aspect of the present invention, a read-only control method for a mobile terminal is provided, in which a bridge is used to connect a computer terminal and the mobile terminal and read data of the mobile terminal, the bridge includes a USB interface module, a main control module and an m.2 interface module, the main control module is respectively connected with the USB interface module and the m.2 interface module, the USB interface module is used to connect with the computer terminal, and the m.2 interface module is used to connect with the mobile terminal, and the read-only control method specifically includes the following steps:
s1: enumerating USB equipment of the computer end under the condition that the computer end detects the access of the mobile terminal, analyzing an NVMe communication protocol, an AHCI protocol and a USB communication protocol by a main control module, and reading data of the mobile terminal;
s2: the main control module analyzes a control instruction of the USB equipment;
s3: if the control instruction is a write instruction, returning an effective value to the computer end, and not executing the write instruction; and
s4: if the control command is a read command, the data is sent to the computer end through a transmission mechanism of the micro-frame and the FIFO.
In some embodiments, step S1 includes: and identifying and addressing the USB equipment accessed on the USB bus, and transmitting the data of the mobile terminal by the NVMe protocol or the AHCI protocol to convert the data into the data transmitted by the USB protocol. Therefore, the mode can support reading of the NVMe memory through the USB3.0 interface, connection of the USB3.0 interface and a computer is supported, hot plug is supported by the USB interface, plug and play can be achieved, and independent installation of a driver is not needed.
In some embodiments, the m.2 interface module of the mobile terminal is based on the PCI-Express standard specification and is compatible for data communication using the NVMe protocol or the AHCI protocol as the application transport specification protocol. Therefore, the mobile terminal compatible with two protocol transmission has the characteristics of strong universality and capability of realizing convenient access of the mobile terminal on various operating system platforms through the USB.
In some embodiments, the NVMe protocol or AHCI protocol is compatible with the simulation analysis optimization interaction instruction to realize compatibility of the mobile terminal. Because the NVMe protocol or the AHCI protocol adopted by the mobile terminals produced by different manufacturers possibly has slight difference so that the compatibility is difficult to achieve, the protocol is interpreted and optimized by means of simulation analysis, so that the bridge can meet the requirements of identification and compatibility of the mobile terminals of different manufacturers, and the compatibility of equipment is greatly improved.
In some embodiments, the USB communication protocol comprises a USB3.0 standard communication protocol. Therefore, the bridge processes the USB command received from the computer terminal based on the USB3.0 standard communication protocol, the read-write speed is high, and the transmission interruption or data incompleteness can not occur during high-speed data transmission.
In some embodiments, the transmission mechanism of the micro-frame fit FIFO comprises the steps of:
s41: receiving data, and disassembling the data into a plurality of data packets and caching the data packets;
s42: filtering the cached data packet;
s43: and configuring the physical layer address, the source address, the receiving address and the data packet type of the data packet to be sent, and sending the filtered data packet to a computer end.
Data is split into thousands of small data packets through a transmission mechanism of micro-frames and FIFO, so that the number of caches and the caching time are greatly reduced, the hardware cost is reduced, and the transmission rate can be improved.
In some embodiments, between steps S41 and S42 further comprises: and sending an interrupt signal after the data packet is cached, and reading the data packet back to the RAM for processing through the DMA in an interrupt service program. Therefore, the data transmission speed can be improved in the transmission process.
In some embodiments, step S1 is preceded by further comprising, for the bridge:
s5: initializing a bridge;
s6: configuring the running environment of a USB interface module and an M.2 interface module;
s7: and opening an interrupt service program, and receiving the data of the mobile terminal after the interrupt.
In some embodiments, step S5 includes:
s51: initializing a clock, a GPIO port and an I2C protocol of the main control module;
s52: allocating and initializing a receiving buffer area and a sending buffer area of a data packet;
s53: initializing the receiving address of the data packet.
The operating environment is initialized and configured to have a better operating environment for reading and transmitting data.
According to another aspect of the present invention, there is provided a read-only control device for a mobile terminal, comprising a memory, a processor and a computer program stored in the memory and running on the processor, wherein the steps of the method of the claims are realized when the computer program is executed by the processor.
According to the method, the USB control instruction of the computer end is analyzed, when the control instruction is a write instruction, an effective value is fed back to the computer end, so that the computer end is mistaken for successful writing instead of really executing the write instruction, all write-in operations are blocked, feedback-free one-way collected data are formed, the data safety of data in a storage medium in the process of obtaining and analyzing is effectively protected, and the judicial validity and the data integrity of evidence obtaining work are guaranteed. In addition, the number of buffers and the buffering time can be greatly reduced through a transmission mechanism of matching the micro-frames with the FIFO, the hardware cost can be reduced, and the transmission rate can be improved. By analyzing the NVMe communication protocol and the USB communication protocol, the NVMe memory can be conveniently accessed on various operating system platforms through the USB. And the USB3.0 standard communication protocol is supported, the reading and writing speed is high, transmission interruption or data incompleteness can be avoided when data is transmitted at high speed, and the transmission is efficient and stable. The scheme of the application also recodes the USB protocol, the USB mass storage protocol, the PCI-e protocol and the NVMe transmission protocol through simulation analysis, thereby creating a logic optimization condition and completing the performance maximization of data bridging among all protocol layers.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 schematic diagram of hardware connection in a read-only control method of a mobile terminal according to an embodiment of the present application;
fig. 2 is a flowchart illustrating a read-only control method of a mobile terminal according to an embodiment of the present invention;
FIG. 3 is a flow chart of a transmission mechanism of a micro frame and FIFO in a mobile terminal read-only control method according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a read-only control method of a mobile terminal according to an embodiment of the present invention before step S1;
fig. 5 is a flowchart illustrating step S5 of the mobile terminal read-only control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the 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 embodiment of the application provides a read-only control method of a mobile terminal, the hardware connection of the method is shown in figure 1, a computer end and the mobile terminal are connected through a bridge, and data of the mobile terminal are read, the bridge comprises a USB interface module, a main control module and an M.2 interface module, the main control module is respectively connected with the USB interface module and the M.2 interface module, the USB interface module is used for being connected with the computer end, and the M.2 interface module is used for being connected with the mobile terminal. Correspondingly, the computer end correspondingly adopts a USB interface module, the mobile terminal correspondingly adopts an M.2 interface module, and the bridge is used as an intermediate connection device between the computer end and the mobile terminal, in a preferred embodiment, the main control module comprises a controller USB338X, and the controller USB338X disassembles and analyzes the USB control command received from the computer end one by one based on a USB3.0 standard communication protocol, blocks all writing operations, cuts off communication handshake from the bottom layer, and forms non-feedback one-way acquisition data. The controller USB338X enables the USB interface module and the m.2 interface module to communicate with each other through internal configuration. The bridge uses an M.2 interface as a physical layer, a link layer based on PCI-Express standard specification and NVME (Non-Volatile Memory Express) protocol as an application transmission specification, and is compatible with systems such as window7, window8 and window 10.
As shown in fig. 2, the read-only control method of the mobile terminal specifically includes the following steps:
s1: enumerating USB equipment of the computer end under the condition that the computer end detects the access of the mobile terminal, and the main control module analyzes the NVMe communication protocol, the AHCI protocol and the USB communication protocol and reads data of the mobile terminal.
In a specific embodiment, step S1 includes: and identifying and addressing the USB equipment accessed on the USB bus, and transmitting the data of the mobile terminal by the NVMe protocol or the AHCI protocol to convert the data into the data transmitted by the USB protocol. In a preferred embodiment, the enumeration is USB bus enumeration, specifically, identification and addressing operations are performed on USB devices connected to a USB bus. Since USB supports hot-plug and plug-and-play, when a USB device is plugged into or removed from USB, the host must use the process of bus enumeration to identify and manage the necessary device state changes. And dynamically configure it. Therefore, the NVMe memory can be read through the USB3.0 interface, the USB3.0 interface is connected with a computer end, the USB interface supports hot plug, plug and play can be realized, and a driver does not need to be installed independently. In a preferred embodiment, the mobile terminal comprises a hard disk. The NVMe memory includes all commercially available mobile terminals with m.2 interfaces, including 2242, 2260, 2280, 22110 and other specifications of SSD hard disks.
The hard disk communication is based on standard protocols such as NVMe (Non-Volatile Memory express) and AHCI (advanced host controller interface), and the like, and realizes the conversion of relevant data of the M.2 interface and the USB3.0 communication interface by combining the relevant drive of the main control chip (USB 338X). And the corresponding tasks such as data transmission, data processing and the like are completed by standard protocols such as NVMe (Non-Volatile Memory express) and AHCI (advanced Host Controller interface).
S2: the main control module analyzes the control instruction of the USB equipment.
S3: if the control instruction is a write instruction, returning an effective value to the computer end and not executing the write instruction.
S4: if the control command is a read command, the data is sent to the computer end through a transmission mechanism of the micro-frame and the FIFO.
As shown in fig. 3, the transmission mechanism of the micro-frame in cooperation with the FIFO includes the following steps:
s41: receiving data, and disassembling the data into a plurality of data packets and caching the data packets;
s42: filtering the cached data packet;
s43: and configuring the physical layer address, the source address, the receiving address and the data packet type of the data packet to be sent, and sending the filtered data packet to a computer end. The main control module breaks a space of a USB data packet in the RAM to be used as a sending buffer area, then writes the data packet into the buffer area, and starts to execute a sending command. Because the main control module is an integrated USB control chip, the transmission and verification of data and the collision detection and avoidance of bus data packets are completed by the control chip. Therefore, the bridge only needs to configure the physical layer address, the source address, the destination address, the type of the data packet and the transmitted data.
Data is split into thousands of small data packets through a transmission mechanism of micro-frames and FIFO, so that useless data can be filtered, effective data can be extracted, the number of caches and the caching time are greatly reduced, hardware cost is reduced, and the transmission rate can be improved.
In a preferred embodiment, between steps S41 and S42 further comprises: and sending an interrupt signal after the data packet is cached, and reading the data packet back to the RAM for processing through the DMA in an interrupt service program. Therefore, the data transmission speed can be improved in the transmission process.
In a preferred embodiment, as shown in fig. 4, the step S1 for the bridge further includes:
s5: the bridge is initialized.
In a preferred embodiment, as shown in fig. 5, step S5 specifically includes:
s51: initializing the clock of the main control module, the GPIO port and the I2C protocol.
After the bridge is powered on, the main control module is initialized firstly, and the main control module comprises registers for initializing function configuration required by a chip clock, a GPIO port, an I2C protocol and the like, setting a relevant working mode, distributing and initializing a receiving and sending buffer area, and initializing a data receiving address.
S52: allocating and initializing a receiving buffer area and a sending buffer area of a data packet;
s53: initializing the receiving address of the data packet.
S6: and configuring the running environments of the USB interface module and the M.2 interface module.
The USB environment configuration comprises the steps of obtaining a device descriptor, setting an address, obtaining an interface, an endpoint descriptor and the like and configuring the corresponding running environment of the solid state disk of the M.2 interface.
S7: and opening an interrupt service program, and receiving the data of the mobile terminal after the interrupt. The main control module receives the data packet and then automatically stores the data packet in a receiving buffer area and sends an interrupt signal, and the main control module can receive the data through DMA in an interrupt program, namely, the data is read back to the RAM for processing through the DMA. Here, operations are mainly performed on some relevant registers.
In a specific embodiment, the M.2 interface module of the mobile terminal is based on PCI-Express standard specification and is compatible to use NVMe protocol or AHCI protocol as application transmission specification protocol for data communication. Therefore, the mobile terminal compatible with two protocol transmission has the characteristics of strong universality and capability of realizing convenient access of the mobile terminal on various operating system platforms through the USB. In a preferred embodiment, the USB communication protocol comprises the USB3.0 standard communication protocol. Therefore, the bridge processes the USB command received from the computer terminal based on the USB3.0 standard communication protocol, the read-write speed is high, and the transmission interruption or data incompleteness can not occur during high-speed data transmission. The bridge has a host end control function and a device end control function of a USB3.0 communication protocol, can realize identification of NVMe standard hard disks produced by various different manufacturers, acquire data of the hard disks, intercept data writing operation and achieve a data one-way transmission function.
In a preferred embodiment, the NVMe protocol or the AHCI protocol is compatible with the simulation analysis optimization interactive instruction to realize compatibility of the mobile terminal. Because the NVMe protocol or the AHCI protocol adopted by the mobile terminals produced by different manufacturers possibly has slight difference so that the compatibility is difficult to achieve, the protocol is interpreted and optimized by means of simulation analysis, so that the bridge can meet the requirements of identification and compatibility of the mobile terminals of different manufacturers, and the compatibility of equipment is greatly improved. The scheme of the application also recodes the USB protocol, the USB mass storage protocol, the PCI-e protocol and the NVMe transmission protocol through simulation analysis, thereby creating a logic optimization condition and completing the performance maximization of data bridging among all protocol layers.
According to another aspect of the present invention, there is provided a read-only control device for a mobile terminal, comprising a storage device, and a processor;
the storage device stores program codes for implementing corresponding steps in the read-only control method of the mobile terminal according to the embodiment of the present invention;
the processor is configured to run the program codes stored in the storage device to perform the corresponding steps of the above read-only control method of the mobile terminal according to the embodiment of the present invention.
In one embodiment, the program code executes, when executed by the processor, the corresponding steps of the aforementioned mobile terminal read-only control method according to an embodiment of the present invention.
According to the method, the USB control instruction of the computer end is analyzed, when the control instruction is a write instruction, an effective value is fed back to the computer end, so that the computer end is mistaken for successful writing instead of really executing the write instruction, all write-in operations are blocked, feedback-free one-way collected data are formed, the data safety of data in a storage medium in the process of obtaining and analyzing is effectively protected, and the judicial validity and the data integrity of evidence obtaining work are guaranteed. In addition, the number of buffers and the buffering time can be greatly reduced through a transmission mechanism of matching the micro-frames with the FIFO, the hardware cost can be reduced, and the transmission rate can be improved. By analyzing the NVMe communication protocol and the USB communication protocol, the NVMe memory can be conveniently accessed on various operating system platforms through the USB. And the USB3.0 standard communication protocol is supported, the reading and writing speed is high, transmission interruption or data incompleteness can be avoided when data is transmitted at high speed, and the transmission is efficient and stable. The scheme of the application also recodes the USB protocol, the USB mass storage protocol, the PCI-e protocol and the NVMe transmission protocol through simulation analysis, thereby creating a logic optimization condition and completing the performance maximization of data bridging among all protocol layers.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A read-only control method of a mobile terminal is characterized in that a computer end and the mobile terminal are connected through a bridge and data of the mobile terminal are read, the bridge comprises a USB interface module, a main control module and an M.2 interface module, the main control module is respectively connected with the USB interface module and the M.2 interface module, the USB interface module is used for being connected with the computer end, and the M.2 interface module is used for being connected with the mobile terminal, and the read-only control method specifically comprises the following steps:
s1: enumerating USB equipment of the computer end under the condition that the computer end detects the access of the mobile terminal, and analyzing an NVMe communication protocol, an AHCI protocol and a USB communication protocol by the main control module and reading data of the mobile terminal;
s2: the master control module analyzes a control instruction of the USB equipment;
s3: if the control instruction is a write instruction, returning an effective value to the computer end, and not executing the write instruction; and
s4: and if the control instruction is a read instruction, sending the data to the computer end through a transmission mechanism of micro-frame matching with FIFO.
2. The read-only control method of claim 1, wherein step S1 includes: and identifying and addressing the USB equipment accessed on the USB bus, and transmitting and converting the data of the mobile terminal by the NVMe protocol or the AHCI protocol into the data transmitted by the USB protocol.
3. The mobile terminal read-only control method of claim 1, wherein the m.2 interface module of the mobile terminal is based on PCI-Express standard specification and is compatible to use the NVMe protocol or the AHCI protocol as application transport specification protocol for data communication.
4. The read-only control method of the mobile terminal according to claim 3, wherein the NVMe protocol or the AHCI protocol is compatible with a simulation analysis optimization interactive instruction to realize compatibility of the mobile terminal.
5. The read-only control method of claim 1, wherein the USB communication protocol comprises a USB3.0 standard communication protocol.
6. The mobile terminal read-only control method of claim 1, wherein the transmission mechanism of the micro-frame matching FIFO comprises the following steps:
s41: receiving the data, and disassembling the data into a plurality of data packets and caching the data packets;
s42: filtering the cached data packet;
s43: and configuring a physical layer address, a source address, a receiving address and a data packet type for sending the data packet, and sending the filtered data packet to the computer terminal.
7. The mobile terminal read-only control method of claim 6, wherein between the steps S41 and S42 further comprising: and sending an interrupt signal after caching the data packet, and reading the data packet back to an RAM for processing through a DMA in an interrupt service program.
8. The read-only control method of claim 1, wherein the step S1 is preceded by further comprising, for the bridge:
s5: initializing the bridge;
s6: configuring the running environment of the USB interface module and the M.2 interface module;
s7: and opening an interrupt service program, and receiving the data of the mobile terminal after the interrupt.
9. The read-only control method of the mobile terminal according to claim 8, wherein said step S5 includes:
s51: initializing a clock, a GPIO port and an I2C protocol of the main control module;
s52: allocating and initializing a receiving buffer area and a sending buffer area of the data packet;
s53: initializing the receiving address of the data packet.
10. A mobile terminal read-only control device comprising a memory, a processor and a computer program stored on the memory and running on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 9 when executing the computer program.
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| CN112738328A (en) * | 2020-12-24 | 2021-04-30 | 维沃移动通信有限公司 | Electronic device |
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Application publication date: 20200508 |