CN103384157A - Low-power-consumption embedded type WIFI module - Google Patents
Low-power-consumption embedded type WIFI module Download PDFInfo
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- CN103384157A CN103384157A CN2013100823112A CN201310082311A CN103384157A CN 103384157 A CN103384157 A CN 103384157A CN 2013100823112 A CN2013100823112 A CN 2013100823112A CN 201310082311 A CN201310082311 A CN 201310082311A CN 103384157 A CN103384157 A CN 103384157A
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Abstract
The invention discloses an embedded type WIFI module. The embedded type WIFI module comprises a software part and a hardware part. The hardware part comprises a microcontroller chip, a WIFI chip, a program memory chip, a filter, a first crystal oscillator, a second crystal oscillator and a power switch tube, wherein the WIFI chip is connected with the microcontroller chip through data signals, the microcontroller chip is connected with the program memory chip through serial external interfaces, the WIFI chip and the microcontroller chip are connected with the power switch tube, the WIFI chip is connected with the filter and the first crystal oscillator, and the microcontroller chip is connected with the second crystal oscillator. The software part comprises a module interface management unit, an application program module, a webpage server, a miniaturized TCP/IP protocol stack, a WIFI driving module, a bottom layer hardware interface driver and a real-time operating system module, wherein the real-time operating system module is used as a framework, and the module interface management unit, the application program module, the webpage server, the miniaturized TCP/IP protocol stack, the WIFI driving module and the bottom layer hardware interface driver are integrated on the real-time operating system module. The embedded type WIFI module has the advantage of being small in size.
Description
Technical field
The present invention relates to a kind of embedded WIFI module, relate in particular to a kind of multi-functional super low-power consumption WIFI module based on the WIFI intelligent networking.
Background technology
Traditional WIFI module, be mainly used in computer in the market, and under the complex operations system environmentss such as mobile phone, the WIFI module is as accessory, and its software-driven runs on the main system hardware platform usually.This characteristics determine that traditional WIFI module can't use in the emerging fields such as Internet of Things Sensor Network that (use in these fields does not have powerful main system hardware platform usually, do not have resource to process complicated software-driven, communication data bandwidth requirement to WIFI is not high, but to power consumption, system response speed, overall dimension etc. have very high requirement).Based on this present situation, the Linux platform software kit in the cost source that this project abandons that traditional WIFI chip manufacturer provides, learn from other's strong points to offset one's weaknesses according to the market demand, with the subminaturization software systems the ICP/IP protocol stack, WIFI drives, web page server, interface is controlled with Management and application layer software and all is implanted on the simple microcontroller of inside modules, only realized with few software resource the WIFI function that complicated cpu system just can be realized, made the various low side devices that have thing to join demand realize that the interconnected hope with online of WIFI is achieved.This module successful Application at new forms of energy, medical monitoring, Industry Control, Smart Home, the fields such as white domestic appliances.
Summary of the invention
For the deficiencies in the prior art, the purpose of this invention is to provide a kind of low-power-consumption embedded WIFI module.
To achieve these goals, technical scheme of the present invention is as follows:
The invention provides a kind of low-power-consumption embedded WIFI module, comprise software section and hardware components,
hardware components comprises microcontroller (MCU) chip, the WIFI chip, program storage (Flash) chip, filter, the first crystal oscillator, the second crystal oscillator and power supply switch tube, the WIFI chip is connected data-signal to connect with microcontroller chip, microcontroller chip adopts Serial Peripheral Interface (SPI) to be connected with the program storage chip, the WIFI chip is connected with power supply switch tube with microcontroller chip and is connected, the WIFI chip respectively with filter be connected crystal oscillator and be connected, microcontroller chip is connected with the second crystal oscillator
Software section comprises module interface administrative unit, application program module, web page server, miniaturization ICP/IP protocol stack, WIFI driver module, bottom hardware interface driver and real time operating system module, the real time operating system module is as framework, and module interface administrative unit, application program module, web page server, miniaturization ICP/IP protocol stack, WIFI driver module and bottom hardware interface driver are integrated on the real time operating system module.
Preferably, described microcontroller chip is provided with user interface and supports serial ports (UART), Serial Peripheral Interface (SPI) (SPI), analog sampling interface (ADC/DAC), universal input/output interface (GPIO), USB (universal serial bus) (USB) and pulse-width modulation interface (PWM).
Preferably, described WIFI chip is based on the (SuSE) Linux OS platform, the minimalist configuration of software resource is required be: 8M byte dynamic data storage unit and 2M byte program memory cell.
Preferably, the size of described WIFI module is: length is 23mm, and wide is 32.5mm, and height is 2.7mm.
Preferably, described WIFI module adopts 48 pin surface mount pad techniques, and pad is distributed in 3 edges of product.
Preferably, described WIFI module is placed in metallic shield inside.
Preferably, described WIFI inside modules is provided with printed board (PCB) plate and carries antenna.
Preferably, described WIFI module-external is provided with the external antenna connector.
Preferably, described WIFI chip internal is integrated power amplifier, low noise amplifier and transceiver toggle switch.
The present invention compared with prior art has the following advantages and beneficial effect:
1, product of the present invention is that fully-integrated serial ports turns the WIFI function, need not to load any external software.Because of module built-in complete that WIFI drives and the microcontroller of ICP/IP protocol stack, make customer equipment need not any software development, only need to just can realize the WIFI interconnection of its equipment and the application of surfing the Net by simple AT operational order.
2, product super low-power consumption of the present invention, remarkable electricity-saving mechanism is suitable for powered battery and uses.Weakness for the high power consumption of traditional WIFI product, product of the present invention reduces by increasing electric power management mechanism and hand shaking working mechanism the time that the WIFI module is opened power amplifier (PA), and realized waking up fast of WIFI function, make super low-power consumption WIFI be achieved.
3, product of the present invention adopts and supports base station (STA)/access point (AP)/base station (STA)+access point (AP) mode of operation that coexists, and networking mechanism has flexibly greatly been simplified complexity and the background technology requirement of customer account management and operation WIFI module.
4, the wireless and remote upgrade software of product support of the present invention, the inside modules program space of super large and the realization of sophisticated software upgrade mechanism make easily simple that the online upgrading of client's product becomes.
5, the self-defined Web webpage of product support client of the present invention upload function, the built-in Web server unit of module independence framework, make the client can be on the basis that stays out of any source code platform of module, realize automatically uploading and upgrading of its customized web page, this has also saved client's product development cycle and follow-up product maintenance greatly.
6, product of the present invention can select plate to carry printed board (PCB) antenna or external antenna interface (IPEX), according to client's concrete application demand and assessment of cost, provides multiple antenna option, simplifies client's design.
7, product of the present invention has extra small size, miniaturization is the inexorable trend that Internet of Things is used, this product from the structural design to the Component selection all with optimizing product overall dimension as basic design concept, this size has been better than same kind of products at abroad, product is at new forms of energy, medical monitoring, and photovoltaic DC-to-AC converter ulate uses, networking model has very strong competition superiority.
Description of drawings
Fig. 1 is the hardware system block diagram of the embedded WIFI module of the present invention.
Fig. 2 is the plate-making layout of the embedded WIFI module of the present invention.
Fig. 3 is the microcontroller chip circuit theory diagrams of the embedded WIFI module of the present invention.
Fig. 4 is the user interface circuit schematic diagram of the embedded WIFI module of the present invention.
Fig. 5 is the outline drawing of the embedded WIFI module of the present invention.
Fig. 6 is the software systems block diagram of the embedded WIFI module of the present invention.
Fig. 7 is the typical application system block diagram of the embedded WIFI module of the present invention.
Fig. 8 is the AT configuration order schematic diagram of the embedded WIFI module of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with embodiment.
Embodiment
The main hardware model that below adopts is as follows:
Microcontroller chip: the ATSAM4S8BA-MU of Atmel company
WIFI chip: the MT5931SA of MTK company
Program storage chip: the EN25F80-100GCP of EON company
Filter: the DEA202450BT-7116E1 of TDK company
The second crystal oscillator: the 12MHz Crystal of FSE company, 4Pin3.2x2.5FH1200048
The first crystal oscillator: 26MHz Crystal, 4Pin2.5x2.0X2B026000B71HZ
Fig. 1 is the hardware system block diagram of the embedded WIFI module of the present invention; Fig. 2 is the plate-making layout of the embedded WIFI module of the present invention, and Fig. 5 is the outline drawing of the embedded WIFI module of the present invention.
A kind of low-power-consumption embedded WIFI module comprises software section and hardware components,
Hardware components comprises microcontroller (MCU) chip, WIFI chip, program storage (Flash) chip, filter, the first crystal oscillator, the second crystal oscillator and power supply switch tube, the WIFI chip is connected data-signal to connect with microcontroller chip, microcontroller chip adopts Serial Peripheral Interface (SPI) to be connected with the program storage chip, the WIFI chip is connected with power supply switch tube with microcontroller chip and is connected, the WIFI chip respectively with filter be connected crystal oscillator and be connected, microcontroller chip is connected with the second crystal oscillator.
Software section comprises module interface administrative unit, application program module, web page server, miniaturization ICP/IP protocol stack, WIFI driver module, bottom hardware interface driver and real time operating system module, the real time operating system module is as framework, and module interface administrative unit, application program module, web page server, miniaturization ICP/IP protocol stack, WIFI driver module and bottom hardware interface driver are integrated on the real time operating system module.
Be provided with user interface and support serial ports (UART), Serial Peripheral Interface (SPI) (SPI), analog sampling interface (ADC/DAC), universal input/output interface (GPIO), USB (universal serial bus) (USB) and pulse-width modulation interface (PWM) on microcontroller chip.
The WIFI chip is based on the (SuSE) Linux OS platform, the minimalist configuration of software resource is required be: 8M byte dynamic data storage unit and 2M byte program memory cell.The size of WIFI module is: length is 23mm, and wide is 32.5mm, and height is 2.7mm.The WIFI module adopts 48 pin surface mount pad techniques, and pad is distributed in 3 edges of product.The WIFI module is placed in metallic shield inside.The WIFI inside modules is provided with that printed board (PCB) plate carries antenna or the WIFI module-external is provided with the external antenna connector.The WIFI chip internal is integrated power amplifier, low noise amplifier and transceiver toggle switch.
As shown in Figure 1, data channel is that MCU passes through the SDIO interface, realizes the data penetration transmission communication of the special interface on WIFI data and MCU., be packaged into TCP or UDP bag and be transferred to user interface through the MCU internal interface after SDIO obtains data as MCU.Control channel comprise by the sleep supervisory signal (comprise WIFI RST, WIFI PMU EN, three holding wires of WIFI SHUT DOWN are processed the WIFI chip and are entered and withdraw from various standby modes, realize the low-power consumption standby of module by sleep and arouse machine processed.) and the interrupt management signal (comprise WIFI-INT, two holding wires of EXT-INT are processed WIFI to MCU and MCU to the two-way interruption of WIFI, effectively guarantee the forwarding of data.）。
Software systems with by the real time operating system module optimized as framework, integrated miniaturization ICP/IP protocol stack of increasing income is realized the TCP/IP Network layer function, WIFI function and networking mechanism are by the most crucial module WIFI driver module realization of system, and management of webpage and customized web page are completed by web server module.The module interface administrative unit is mainly completed the specific function with the internet of things related needs, as various low speed peripheral data interfaces, and low-power consumption electricity-saving mechanism, the AT command set of simplifying, the management of networking flexibly.Application program module is the optional module that provides for client's special interface demand.
Microcontroller (MCU) plug-in 1M byte program memory (Flash), deposit the WIFI driver code of product, Web web page server code and client applications code, while is deposited the program code of upgrade software when also providing the space of 512K byte to be used for wireless and remote upgrade.Simultaneously, the inner program memory space that also has the 512K byte of microcontroller (MCU) is mainly used to place the unify program code of miniaturization ICP/IP protocol stack of miniaturization real-time oss, also has the interface management program code of WIFI chip.When system starts, from the space startup of microcontroller (MCU) internal program memory.
Microcontroller (MCU) and WIFI chip provide clock source by the crystal oscillator of oneself respectively.MCU adopts 12MHz, and the crystal of 20ppm precision provides its dominant frequency 48MHz internal clocking and SDIO interface (12MHz) clock, and other Peripheral Interfaces, as UART, and SPI, the various clocks that USB interface is required.The WIFI chip adopts 26MHz, and the 2520 little encapsulation high-precision crystals of 10ppm provide the main frequency doubling clock source of WIFI.The WIFI chip internal also produces the 32KHz low-speed clock source that WIFI works required under low-power consumption mode simultaneously.
Radio frequency part because the WIFI chip internal integrated power amplifier (PA), low noise amplifier (LNA) and transceiver toggle switch (T/R) so greatly saved the quantity required of external radio frequency element, have also been saved simultaneously the space.Module only needs outside design balance filter, just can be directly connected on printed board antenna or exterior antenna connector (IPEX), and the WIFI wireless signal is gone out by the antenna transmission on printed board antenna or IPEX connector.
Power unit, system adopts single 3.3V Power supply, and designed internal power switch and can pass through microcontroller (MCU), come the powering on and close electricity of main current consuming apparatus WIFI chip of control system independently, make whole system have ready conditions and to be operated under the standby mode of very low-power consumption, adapted to the power consumption demand of portable market product.
The particular hardware circuit design drawing of WIFI module can be with reference to figure 3 and Fig. 4.
The concrete hardware of WIFI module is realized, can be with reference to shown in Figure 2, account for the microcontroller (MCU) of main area, WIFI chip and external program memory (Flash), be positioned over 23mm(with " product " font long) x32.5mm(is wide) printed board on, place printed board antenna and IPEX antenna connector at the low order end of printed board (do not distribute surface mount pad beyond) simultaneously.For electromagnetic interference and anti-interference (EMC/EMI) ability of improving product, and satisfy the standard of the International Certifications such as CE/FCC, this module has designed metallic shield, and except antenna and antenna connector, all components and parts are placed in metallic shield.Built-in printed board antenna adopts the snakelike Antenna Design of PiFi, and concrete profile is with reference to figure 2.Module adopts 48 pin surface mount pad techniques, and pad is distributed in 3 edges of product.All components and parts are in the layout of the top layer (TOP) of module, and in design, whole components and parts are placed in metallic shield, have greatly promoted electromagnetic interference and anti-interference (EMC/EMI) ability of product.
Surface mount pad technique helps product to be placed in height-limited small space, and this is very important requirement at thing connection sensory field and portable use field.3 edges are all placed pad and are made the overall dimension of product further be reduced.Extra small physical size makes the application space of this product very large.
This embedded WIFI module is supported two kinds of antenna forms: inner printed board (PCB) plate carries antenna and external antenna connector.According to client's demand, module can be configured to built-in and external antenna flexibly when dispatching from the factory, and only by changing the element welding position of a multiplexing resistance, just can simply realize.
Software configuration is described:
Whole software systems framework is based on embedded real-time operating system (Free-RTOS), with WIFI chip MTK5931SA in complete being transplanted on this operating system of the driver under Linux, and integrated miniaturization IP stack of increasing income realizes the TCP/IP Network layer function, make product can support access point (AP), base station (STA), access point AP+ base station STA works simultaneously, and supports the technology such as WIFI is direct-connected.
Concrete software architecture such as Fig. 6, the real time operating system module acts on software architecture at all levels as the operation platform of system, and bears system resource allocation, process scheduling, the important functions such as interface function management.
The bottom hardware driving interface module is the software section the most relevant with the hardware configuration of microcontroller, the configuration words information initial according to hardware, module just can each interface function of initialization, as clock, SDIO interface etc., for ensuing WIFI driver module loads ready work, and guarantee that Systems balanth powers on.
The WIFI driver module is the kernel software parts of system, mainly is the transplanting of WIFI driver element.The WIFI chip is based on the (SuSE) Linux OS platform by the software-driven kit that former factory provides, minimalist configuration requirement to software resource is: 8M byte dynamic data storage unit (SDRAM) and 2M byte program memory cell (Flash), this resource requirement can the amount of providing considerably beyond the internal resource of common microcontroller (MCU), and is can't be directly integrated and transplant.By changing subminiaturized operating system, transplant and optimize core WIFI chip drives code, according to the specific Internet of Things market demand, peel off the redundancy program of original driving code and reduce taking of Dynamic Resource Allocation for Multimedia space, exchange greatly reducing of resource occupation amount for by sacrificing wireless communication bandwidth and limiting the relevant functional attributes of access point (AP), and the maximized overall work power consumption that has reduced system.This product finally uses 128K byte static data memory cell (SRAM) and 512K byte program memory cell (Flash) not only to realize whole embedded WIFI functions (comprising encryption), and the realization of novelty the coexistent working mechanism in access point (AP)+base station (STA).
Complexity and the background technology requirement of customer account management and operation WIFI module have greatly been simplified in the realization of this kind working mechanism, have solved the bottleneck that the scale of embedded WIFI product enters into huge numbers of families' a maximum.
Miniaturization ICP/IP protocol stack has adopted the code of increasing income that it is optimized, and finally realizes TCP/IP Network layer function IP stack, and supports TCP/IP, ICMP, the various protocols such as DHCP Server/Client, HTTP.
Management of webpage and customized web page are completed by web server module.The module interface administrative unit is mainly completed the specific function with the internet of things related needs, as various low speed peripheral data interfaces, and low-power consumption electricity-saving mechanism, the AT command set of simplifying, the management of networking flexibly.Application program module is the optional module that provides for client's special interface demand
Typical case's application case describes in detail:
Be that the system of a kind of typical embedded WIFI module when interconnected with customer equipment is connected block diagram as Fig. 7, wherein each concrete detailed explanation that connects signal is as follows:
NReset-module reset signal, input, Low level effective.
Inside modules has moves 3.3V on resistance, need not outside pull-up resistor.When module powers on or when breaking down, MCU need to do reset operation to module, drags down at least to draw high after 10ms.
NLink-module WIFI connects indication, output.
If when module is made as the STA pattern and successfully is connected to AP, output low level can be used for judge module and whether be in the networking state.There is pull-up resistor inside, need not outside pull-up resistor.If do not need to use this pin function, make it be in vacant state, namely need not any connection.
The nReady-module is completed normal startup, output.
When the normal startup of module was completed, whether output low level can normally start for judge module and complete and be operated in normal mode; If do not need to use this pin function, make it be in vacant state, namely need not any connection.
NReload-recovers to dispatch from the factory default setting, input, Low level effective.
Can be connected to outer button or chip pin, when button is pressed, pin be moved to low level, decontrol afterwards in 3 seconds, then the module recovery Default Value restarts.There is pull-up resistor inside, need not externally to connect a pull-up resistor.If do not need to use this pin function, make this pin be in vacant state, namely need not any connection.
WPS-automatically with the router negotiation, obtain password and connect.
Pin drags down, and after 500ms, draws high, and beginning WPS consults, if router is also pressed the WPS button, module and router are consulted password, connect, and then module the SSID of router and encrypting storing, does not need when power on next time again to consult, and is just accessible.
The Sleep-RQ-dormancy is controlled, input.
Under normal operating conditions, it is set to low level, after 1 second, it is set to high level, this module enters resting state; Otherwise under resting state, wake-up mode supports that Sleep-RQ wakes up, and it is set to low level, after 1 second, it is set to high level, and this module is waken up, and enters operating state.If do not want to use this function, make this pin be in vacant state, namely need not any connection.
The indication of Sleep-ON-resting state, output.
This pin is in resting state or in running order in order to indicating module, and the low level representation module is in park mode, and high level representation module is in normal operation.If do not want to use this function, make this pin be in vacant state, namely need not any connection.
UART0_TXD/RXD-serial data receiving and transmitting signal.
Typical case AT command configuration case describes in detail:
This WIFI module can be completed its configuration effort by Web webpage and AT order, and concrete AT command configuration process can be with reference to figure 8 application cases.
Product of the present invention is that fully-integrated serial ports turns the WIFI function, need not to load any external software.Because of module built-in complete that WIFI drives and the microcontroller of ICP/IP protocol stack, make customer equipment need not any software development, only need to just can realize the WIFI interconnection of its equipment and the application of surfing the Net by simple AT operational order.
Product super low-power consumption of the present invention, remarkable electricity-saving mechanism is suitable for powered battery and uses.Weakness for the high power consumption of traditional WIFI product, product of the present invention reduces by increasing electric power management mechanism and hand shaking working mechanism the time that the WIFI module is opened power amplifier (PA), and realized waking up fast of WIFI function, make super low-power consumption WIFI be achieved.
Product of the present invention adopts supports base station (STA)/access point (AP)/base station (STA)+access point (AP) mode of operation that coexists, and networking mechanism has flexibly greatly been simplified complexity and the background technology requirement of customer account management and operation WIFI module.
Product support of the present invention is wireless and remote upgrade software, and the inside modules program space of super large and the realization of sophisticated software upgrade mechanism make easily simple that the online upgrading of client's product becomes.
The self-defined Web webpage of product support client of the present invention upload function, the built-in Web server unit of module independence framework, make the client can be on the basis that stays out of any source code platform of module, realize automatically uploading and upgrading of its customized web page, this has also saved client's product development cycle and follow-up product maintenance greatly.
Product of the present invention can select plate to carry printed board (PCB) antenna or external antenna interface (IPEX), according to client's concrete application demand and assessment of cost, provides multiple antenna option, simplifies client's design.
Product of the present invention has extra small size, miniaturization is the inexorable trend that Internet of Things is used, this product from the structural design to the Component selection all with optimizing product overall dimension as basic design concept, this size has been better than same kind of products at abroad, product is at new forms of energy, medical monitoring, and photovoltaic DC-to-AC converter ulate uses, networking model has very strong competition superiority.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and in the General Principle of this explanation is applied to other embodiment and needn't pass through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not breaking away from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (9)
1. an embedded WIFI module, comprise software section and hardware components, it is characterized in that:
Hardware components comprises microcontroller chip, WIFI chip, program storage chip, filter, the first crystal oscillator, the second crystal oscillator and power supply switch tube, the WIFI chip is connected data-signal to connect with microcontroller chip, microcontroller chip adopts Serial Peripheral Interface (SPI) to be connected with the program storage chip, the WIFI chip is connected with power supply switch tube with microcontroller chip and is connected, the WIFI chip respectively with filter be connected crystal oscillator and be connected, microcontroller chip is connected with the second crystal oscillator
Software section comprises module interface administrative unit, application program module, web page server, miniaturization ICP/IP protocol stack, WIFI driver module, bottom hardware interface driver and real time operating system module, the real time operating system module is as framework, and module interface administrative unit, application program module, web page server, miniaturization ICP/IP protocol stack, WIFI driver module and bottom hardware interface driver are integrated on the real time operating system module.
2. embedded WIFI module according to claim 1 is characterized in that: described microcontroller chip is provided with user interface and supports serial ports, Serial Peripheral Interface (SPI), analog sampling interface, universal input/output interface, USB (universal serial bus) and pulse-width modulation interface.
3. embedded WIFI module according to claim 1, it is characterized in that: described WIFI chip is based on the (SuSE) Linux OS platform, the minimalist configuration of software resource is required be: 8M byte dynamic data storage unit and 2M byte program memory cell.
4. embedded WIFI module according to claim 1, it is characterized in that: the size of described WIFI module is: length is 23mm, and wide is 32.5mm, and height is 2.7mm.
5. embedded WIFI module according to claim 1 is characterized in that: described WIFI module adopts 48 pin surface mount pad techniques, and pad is distributed in 3 edges of product.
6. embedded WIFI module according to claim 1 is characterized in that: described WIFI module is placed in metallic shield inside.
7. embedded WIFI module according to claim 1, it is characterized in that: described WIFI inside modules is provided with the printed board plate and carries antenna.
8. embedded WIFI module according to claim 1, it is characterized in that: described WIFI module-external is provided with the external antenna connector.
9. embedded WIFI module according to claim 1 is characterized in that: described WIFI chip internal is integrated power amplifier, low noise amplifier and transceiver toggle switch.
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| CN109634671A (en) * | 2018-11-26 | 2019-04-16 | 晶晨半导体(上海)股份有限公司 | A method of BOOT mode is controlled using integrated chip |
| CN109656351A (en) * | 2018-12-21 | 2019-04-19 | 四川爱联科技有限公司 | The system for reducing MCU control WiFi stand-by power consumption |
| CN109992320A (en) * | 2017-12-28 | 2019-07-09 | 航天信息股份有限公司 | The interaction method for building up and device of embedded device and WIFI module |
| CN110119282A (en) * | 2019-05-14 | 2019-08-13 | 苏州大学 | A kind of internet-of-things terminal and system based on general-purpose built-in type computer |
| CN110727448A (en) * | 2019-09-29 | 2020-01-24 | 重庆国翰能源发展有限公司 | OTA (over the air) upgrading method for charging pile |
| CN110798328A (en) * | 2018-08-01 | 2020-02-14 | 珠海格力电器股份有限公司 | Wireless network chip, electrical equipment, configuration processing method and device |
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| CN114779658A (en) * | 2022-06-21 | 2022-07-22 | 深圳市桑尼奇科技有限公司 | Be applied to wifi chip of intelligent house |
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