CN101901058B - Wireless keyboard and mouse receiving and transmitting device - Google Patents
Wireless keyboard and mouse receiving and transmitting device Download PDFInfo
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- CN101901058B CN101901058B CN2009100622441A CN200910062244A CN101901058B CN 101901058 B CN101901058 B CN 101901058B CN 2009100622441 A CN2009100622441 A CN 2009100622441A CN 200910062244 A CN200910062244 A CN 200910062244A CN 101901058 B CN101901058 B CN 101901058B
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Abstract
The invention provides a wireless keyboard and mouse receiving and transmitting device comprising a transmitting part and a receiving part. The transmitting part comprises a PS2 interface for being connected with a keyboard and a mouse, a transmitter processor and a wireless transmitter module, keyboard information and mouse information are transmitted to the transmitter processor through the PS2 interface, coded by the transmitter processor to form coding information which is transmitted to the wireless transmitter module for wireless transmission. The receiving part comprises a wireless receiving module, a receiving processor and a USB interface for being connected with a host, bidirectional series communication is established between the wireless receiving module and the wireless transmitter module, and the coding information transmitted by the wireless transmitter module is received by the wireless receiving module and then transmitted to the receiving processor which converts the keyboard information and the mouse information acquired by decoding the coding information into HID (Host Interface Device) data format and transmits the information to the host through the USB interface. The invention realizes that the PS2 (Play Station) mouse information and the keyboard information are collected, coded, transmitted and received in a wireless mode.
Description
Technical field
The invention belongs to wireless communication technology field, particularly Wireless Keyboard and mouse receiving and transmitting device.
Background technology
The 27MHz RF technology that existing Wireless Keyboard and mouse (being called for short the cordless key mouse) are adopted, opereating specification has only 1.8 meters, and interference problem appears in like product easily; Bluetooth technology can realize 10 meters coverage, but because will pay patent royalty, causes adopting all extra increase 3-5 of its cost of the product dollar of Bluetooth technology.Shortcomings such as 2.4G wireless technology has solved, and 27Mhz power is big, transmission range short, interfering with each other appears in like product easily; Transfer rate has reached 2Mbps; And support automatic frequency adjustment; The transmitted in both directions pattern has also thoroughly been stopped the generation of signal interruption situation, makes that effectively service range and glitch-free cordless key mouse transceiver become possibility more than 15 meters in exploitation.
But the keyboard of widespread use and mouse all are based on the PS2 interface standard, how to utilize the existing wired key mouse of PS2 equipment, under the support of 2.4G wireless technology, grow the operation of distance, become the technical matters that prior art needs to be resolved hurrily.
Summary of the invention
The object of the invention is to solve the prior art deficiency, has proposed a kind of Wireless Keyboard and mouse receiving and transmitting device.
Technical scheme of the present invention is: comprise radiating portion and receiving unit;
Said radiating portion comprises PS2 interface, emission processor and the wireless transmitter module that is used for being connected with mouse with keyboard; Keypad information and mouse message are transferred to the emission processor through the PS2 interface; The emission processor is transferred to wireless transmitter module to keypad information and the mouse message formed coded message of encoding, and carries out wireless transmission by wireless transmitter module;
The USB interface that said receiving unit comprises wireless receiving module, receiving processor and is used for being connected with main frame; Wireless receiving module and wireless transmitter module are based upon the bidirectional serial communication on the 2.4GHz frequency; Wireless receiving module is sent to receiving processor after receiving the coded message that wireless transmitter module sends, and receiving processor is to coded message decoding gained keypad information and mouse message converts the HID data layout into after USB interface is transferred to main frame.
And, the AT89C2051 chip microcontroller of said emission processor adopting atmel corp, said receiving processor adopts the CY7C68013 chip microcontroller in the Cypress Semiconductor EZ-USB FX2 of the company series.
And said wireless transmitter module adopts has the product that software is established address function, and said wireless receiving module adopts the product with response address calibration function.
And said wireless receiving module and wireless transmitter module all adopt the NewMsg-RF2401 digital wireless communication module of telecom technology co., ltd in the source, Hangzhou to realize.
The present invention proposes a kind of Wireless Keyboard and mouse receiving and transmitting device, realized under wireless mode the collection of PS2 mouse-keyboard information, the circuit of encoding, transmitting and receiving.Scheme implementation of the present invention is easy, and is with low cost, integrated 2.4GHZ wireless communication technology and PS2 interface standard, provides the PS2 interface to reach the radio operation of coverage more than 15 meters for having keyboard and mouse now; Even under the situation that wall intercepts, also can realize the effective service range more than 6 meters.The present invention also uses the software of wireless module to establish address function, has realized the noiseless work between many complete equipments.
Description of drawings
Fig. 1 is a structural drawing of the present invention;
Fig. 2 is embodiment of the invention mouse and keyboard PS2 interface circuit figure;
Fig. 3 is the wireless module RF2401 interface circuit figure of the embodiment of the invention;
Fig. 4 is the AT89C2051 interface microcontroller circuit diagram of the embodiment of the invention;
Fig. 5 is the workflow diagram of the AT89C2051 single-chip microcomputer of the embodiment of the invention;
Fig. 6 is the receiving unit circuit theory diagrams of the embodiment of the invention.
Embodiment
Referring to Fig. 1, technical scheme of the present invention is used to realize that Wireless Keyboard and mouse receiving and transmitting device comprise radiating portion and receiving unit based on the keyboard of PS2 interface standard and the radio communication between mouse and the main frame:
Said radiating portion comprises PS2 interface, emission processor and the wireless transmitter module that is used for being connected with mouse with keyboard; Keypad information and mouse message are transferred to the emission processor through the PS2 interface; The emission processor is transferred to wireless transmitter module to keypad information and the mouse message formed coded message of encoding, and carries out wireless transmission by wireless transmitter module;
The USB interface that said receiving unit comprises wireless receiving module, receiving processor and is used for being connected with main frame; Wireless receiving module and wireless transmitter module are set up bidirectional serial communication; Wireless receiving module is sent to receiving processor after receiving the coded message that wireless transmitter module sends, and receiving processor is to coded message decoding gained keypad information and mouse message converts the HID data layout into after USB interface is transferred to main frame.Bidirectional serial communication between wireless receiving module and the wireless transmitter module is set on the 2.4GHz frequency, can support to grow the valid function of distance.
Consider present computer technology, all can be provided with a plurality of USB interfaces on the main frame, the present invention partly is provided with USB interface to connect main frame in reception.If adopt other serial line interface to insert main frame, should belong to the alternative that is equal to of technical scheme of the present invention.Receiving equipment employing HID human-computer interaction device's quasi-protocol realization keypad information and mouse message are to the transmission of main frame, and keypad information and mouse message can abbreviate the HID sign indicating number as after converting the HID data layout into.The HID sign indicating number is the data that main frame can Direct Recognition, transfers to main frame through USB interface and gets final product.The main frame that the present invention supported except that the main frame of individual PC, also comprises notebook computer etc.
Wireless Keyboard provided by the invention and mouse receiving and transmitting device design respectively to handheld terminal and host side; After on the PS2 interface that during use the mouse and the keyboard of any PS2 interface correctly is connected to radiating portion; Again the USB interface of receiving unit is linked to each other with any USB interface on the main frame; Then wired keyboard and mouse promptly can be transformed into Wireless Keyboard and mouse, constitute complete computer system.Connect through radio communication, the user just can obtain reaction at main frame in the operation of keyboard and mouse, and total system is carried out work according to following steps:
Radiating portion at handheld terminal; Keyboard and mouse message transfer to the emission processor according to the PS2 serial communication protocol; By the emission processor it is carried out certain format conversion and form coded message and be packaged into Frame, carry out radio frequency through wireless transmitter module then and send.The data frame format of coded message can have various ways, and for example: first byte of frame is a flag, is keyboard or mouse message in order to difference; Second byte of frame is the byte length of keyboard or mouse message; The 3rd byte opening entry keyboard or mouse message of frame.Receiving unit in host side; With the corresponding wireless receiving module of wireless transmitter module address code the coded message that receives is transferred to receiving processor, receiving processor extracts gained keypad information and mouse message through USB interface and upper corresponding main-machine communication from coded message.Keyboard and mouse promptly can carry out wireless serial communication with main frame, realize the remote-wireless operation.
During practical implementation, can adopt ripe singlechip technology to realize emission processor and receiving processor.Single-chip microcomputer is except having advantage with low cost, through mcu programming, can also expanded function, and realize robotization.The emission processor adopting AT89C2051 chip microcontroller of the embodiment of the invention, said receiving processor adopt the CY7C68013 chip microcontroller in the EZ-USB FX2 series.
In order to prevent to disturb, the invention provides further technical scheme: said wireless transmitter module adopts has the product that software is established address function, and said wireless receiving module adopts the product with response address calibration function.The wireless receiving module of the embodiment of the invention and wireless transmitter module all adopt NewMsg-RF2401 digital wireless communication module to realize, hereinafter to be referred as the RF2401 module.The RF2401 module is operated on the 2.4GHz frequency, and support software is established address function and response address calibration, therefore can come differentiation equipment through address code.The individual data bag maximum of RF2401 module can be 32 bytes.Packet is made up of address bit+data bit+check bit, and check bit is 2 bytes to the maximum, and address bit is 5 bytes to the maximum but can not is 0 entirely, and therefore 128^5-1 address code can be set at most distinguishes different complete equipments.Among the embodiment, the address bit significance bit is got 2 bytes, so can establish 128*128-1=16383 different address sign indicating number altogether, promptly can distinguish 16383 cover distinct devices.During practical implementation; Establish address mode by the AT89C2051 single-chip microcomputer according to the software of RF2401 module coded message further is encoded into following form: address bit+data bit+check bit, wherein data bit promptly is the original encoding information of above-mentioned flag+byte length+keyboard or mouse message form.Partly gather the coded message of corresponding with it above-mentioned form that wireless transmitter module sends in reception and can carry out the address bit calibration.Thereby can distinguish many complete equipments, even when same all many complete equipments are worked simultaneously, also can not disturbed mutually.
Through to the AT89C2051 mcu programming, can collect keypad information and mouse message automatically and require wireless transmitter module to send, realize the emission process robotization.The soft project of AT89C2051 single-chip microcomputer comprises the Rf2401.h file supporting with the RF2401 module in realizing; Realized the software interface of wireless module; The Rf2401.h file is provided by RF2401 module manufacturer, has wherein defined initial configuration function C onfig2401 (), is set to the function S etTxMode () of sending mode; The function S etRxMode () of receiving mode; The function R F2401_TxPacket () that data are sent, and the function R F2401_RxPacket () of Data Receiving, the AT89C2051 SCM program can be controlled the coded message transmission through calling with superior function.The soft project of same CY7C68013 single-chip microcomputer comprises the Rf2401.h file supporting with the RF2401 module in realizing, can control the coded message reception through calling with superior function.The AT89C2051 mcu programming can adopt standard C 51 language to write; The present invention provides the embodiment workflow so that implement reference; Can be referring to Fig. 5: at first, routine call Config2401 () configuration wireless module RF2401 makes the external unit operate as normal to keyboard and mouse initialization; Clock status through While (1) poll statement poll keyboard and mouse; When the operation that occurs keyboard or mouse; Clock line KCLK or MCLK drag down; AT89C2051 single-chip microcomputer read data information: if keypad information, judge that whether button is the button that general button or Num Lock, Caps Lock, Scroll Lock have the LED indication.If the former; Keypad information is encoding in the emission buffer memory that is provided with in the single-chip microcomputer; It is emission mode that wireless transmitter module is set; The function R F2401_TxPacket () that sends through data adds the keypad information corresponding coding information address information and sends into wireless transmitter module, and wireless transmitter module carries out transmitted at high speed with form of data frames after adding check information; If the latter, single-chip microcomputer sends control command to keyboard, changes keyboard mode of operation and LED show state.If mouse message; Judge then whether mouse has roller,, then read the mouse message of 4 bytes successively if having; If do not have; Then read the mouse message of 3 bytes, last same mouse message is encoding in the emission buffer memory that is provided with in the single-chip microcomputer, and it is emission mode that wireless transmitter module is set; The function R F2401_TxPacket () that sends through data adds the mouse message corresponding coding information address information and sends into wireless transmitter module, and wireless transmitter module carries out transmitted at high speed with form of data frames after adding check information.Should remove the clock line state that the emission buffer memory also detects keyboard and mouse again behind the intact Frame of every transmitted at high speed, repeat above process to launch next Frame.Can carry out software programming according to this workflow by those skilled in the art during practical implementation and get final product, " the NewMsg_RF2401 development guides V2.0 " that correlative detail can provide with reference to telecom technology co., ltd in the source, Hangzhou.
Through to the CY7C68013 mcu programming, can support usb protocol, can keypad information and mouse message be transferred to upper main frame automatically through USB interface.The working routine of CY7C68013 single-chip microcomputer adopts standard C 51 language to write.Shorten the construction cycle for the ease of the developer, CYPRESS company for the developer provide program that the firmware program framework realizes cyclic query and with the end points interrupt routine of main-machine communication.The present invention advises adopting the program frame of this kit to design, and only need utilize this framework just can realize functions such as chip initiation, the request of processing USB standard device, power supply hang-up management during practical implementation.Because belong to prior art, the present invention carries out simple declaration to the master file that this program frame comprised:
FW.C has been responsible for processes such as USB device connection, re-enumeration, device initialize;
The dscr.a51 document definition the various descriptors that need when shaking hands of USB device, the present invention makes amendment it, has defined two interface descriptor information of mouse-keyboard, has realized HID keyboard and mouse unit equipment descriptor;
FX2.H has mainly defined the data structure of various secondary interrupt vectors and descriptor;
FX2REGS.H has defined registers all among the USB;
Fx2hid.c has mainly realized the function of framework the inside; Realized the hook of function; The present invention has realized initialization and endpoint configurations work in TD_Init () function; In TD_Poll () function, realized converting the keyboard and mouse scan code to the HID sign indicating number, thereby and the HID sign indicating number is input to USB end points buffer memory has communicated with main frame.
The present invention is newly-increased ScanToHID.H file in the receiving end firmware program, has defined two transfer functions, has realized the conversion of hardware scanning sign indicating number to the HID sign indicating number, conveniently in TD_Poll () function, calls.
Firmware program is responsible for each hardware cell of initialization, reconfigures equipment, mainly comprises device descriptor information, functions of the equipments code and communication control function code.EZ-USB FX2 development kit offers a firmware function library of user (Ezusb.lib) and firmware frame, and both all are based on, and C51 develops, and provides a series of function to quicken the exploitation of USB firmware program.The embodiment of the invention has comprised FX2.H and FX2REGS.H two header file in the SCM program of CY7C68013, and in project, links Ezusb.Lib, just can directly use each function in the firmware library.The Project Realization of the SCM program of CY7C68013 is with reference to the said procedure framework and realized that the Rf2401.h that Rf2401 module manufacturer provides gets final product; Practical implementation can be referring to " the USB2.0-CY7C68013-128S development board user manual Ver1.1 " and above-mentioned " NewMsg_RF2401 development guides V2.0 " of wound power scientific and technical research chamber, Chinese source, and the present invention will not give unnecessary details.
Receive part and be connected with main frame, can integral body be regarded as USB device with USB interface.According to existing usb protocol: USB device one powers on; The USB controller of main frame sends reset command; CY7C68013 single-chip microcomputer firmware program framework calls TD_Init () function and accomplishes work such as initialization and USB endpoint configurations; Then equipment is enumerated in beginning again in the interval of 1s, and the descriptor of USB device transmitting apparatus, configuration, interface, end points and character string and initialization information are to main frame, till setting (SETUP) package is received breakpoint 0.Afterwards, the firmware framework calls TD_Poll () function repeatedly and realizes the conversion to the HID sign indicating number of mouse message and keypad information, and the HID code data is exported in the USB port buffer memory, and then communicates with main frame.USB interface generally provides 4 ports, and it is control port that the embodiment of the invention adopts USB 0 port, and 1 port is the keyboard data COM1, and 2 ports are the mouse data COM1.
The CY7C68013 SCM program compiling back of adopting standard C 51 language to write forms firmware program .hex file.During practical implementation; Can change into the .iic file to firmware program .hex file through existing Hex2Bix.exe application program; Can download to the EEPROM on the plate through the special-purpose control program ControlPanel of existing EZ-USB then, and bring into operation in CY7C68013 single-chip microcomputer internal RAM.
For the ease of implementing reference, the present invention provides the CD circuit description of embodiment following:
The PS2 interface circuit adopts existing P S2-6PIN module interface; The PS2 interface that promptly has 6 pins, the concrete connection referring to Fig. 2: clock line KCLK, the data line KData of the PS2 interface J-K that will be used for being connected with keyboard link to each other with 9 (P3.5) with the I/O port 3 (P3.1) of AT89C2051 single-chip microcomputer respectively; Clock line MCLK, the data line MData of the PS2 interface J-M that will be used for being connected with keyboard link to each other with 8 (P3.4) with the port 2 (P3.0) of AT89C2051 single-chip microcomputer respectively; 3,4 pins of PS2 interface connect power supply VCC and ground connection respectively.Clock line KCLK, the MCLK state of the continuous poll PS2 of AT89C2051 single-chip microcomputer interface; Press or during mouse action as button; Clock line KCLK or MCLK drag down, and the AT89C2051 single-chip microcomputer is that unit reads external mouse information and keypad information with the byte through data line KData or MData.S among the figure is a direction signal symbol, and expression wired keyboard and MouseAcross are crossed this direction and be inserted into the PS2 interface.
Wireless transmitter module adopts the RF2401 module, and its interface circuit that provides is referring to transmitting-receiving, configuration, the free time of Fig. 3: PWR_UP, CE, CS and four pin decision module of DR1 and the four kinds of mode of operations of shutting down.Clock control signal, data line DATA that clock line CLK1 is used to receive the AT89C2501 single-chip microcomputer are used to receive the coded message that the AT89C2501 single-chip microcomputer provides.
In the radiating portion, the circuit of AT89C2501 single-chip microcomputer is referring to Fig. 4: two I/O ports (P3.4, P3.5) that PS2 keyboard and mouse take the AT89C2501 single-chip microcomputer respectively are to realize and the communicating by letter of single-chip microcomputer.The PWR_UP of the interface circuit of wireless transmitter module, CE, CS, DR1 pin connect port one 8 (P1.6), 14 (P1.2), 13 (P1.1) and 12 (P1.0) of AT89C2051 single-chip microcomputer respectively; Clock line CLK1, data line DATA connect port one 1 (P3.7), 7 (P3.3) of AT89C2051 single-chip microcomputer respectively; Thereby can pass through the mode of operation and the clock status of AT89C2501 Single-chip Controlling wireless module, and realize the data communication of wireless module and single-chip microcomputer through DATA port (P3.3).The operate as normal of AT89C2501 single-chip microcomputer also needs external pull-up resistor that common settings such as reset signal RST are provided, and the present invention will not give unnecessary details.
In the receiving unit, 8051 microcontrollers and the programmable peripheral interface of the CY7C68013 single-chip microcomputer in the EZ-USB FX2 series is integrated USB2.0 transceiver, SIE SIE, enhancing.Wireless receiving module receives and sends the CY7C68013 single-chip microcomputer to from the signal of transmitter and with correlative coding information, and the inner HID of realization of CY7C68013 agreement converts the coded message of wireless receiving module the HID sign indicating number into and passes through USB interface and main-machine communication.Fig. 6 is receiving unit circuit design principle figure: chip SPX1117 is a low-power consumption forward voltage regulator, the input of VIN end input computing machine+the 5V DC voltage, enable the RED indicator, VOUT end output burning voltage.The embodiment of the invention is loaded relevant software programs through EZ-USB Control Panel control panel from EEPROM; And transfer among the RAM in the CY7C68013 single-chip microcomputer and carry out; EEPROM adopts existing 24LC64 chip to realize that its SCL pin, SDA pin are connected with the port 22,23 of CY7C68013 single-chip microcomputer respectively.Wherein, A0, A1, A2 are address port, through use jumper cap gang socket Header2 can recover EEPROM as default setting in order to the firmware program of reloading.The WP of 24LC64 chip, Vss, Vcc pin are respectively applied for write-protect, ground connection and connect+5V voltage.
In the receiving unit wireless receiving module be similar to being connected of wireless transmitter module and AT89C2051 single-chip microcomputer in the radiating portion of CY7C68013 single-chip microcomputer: the DATA of wireless receiving module, DR1, CLK, PWR UP, CE and CS pin are connected the port 45,44,43,42,41,40 of CY7C68013 single-chip microcomputer respectively.
Wherein USB_A is meant USB A type plug, promptly common so-called USB interface.Wherein VBUS is that computing machine is exported+the 5V DC voltage after the device power, and D-, D+ are data line, and GND is an earth terminal.
During practical implementation, adopt the chip products such as single-chip microcomputer of other models to realize circuit, also should be in protection domain of the present invention.
With keyboard transmission Shift and G monogram key is example, and the treatment scheme of the embodiment of the invention is:
At first with the PS2 interface of keyboard and mouse insertion radiating portion, energising is with the USB mouth insertion main frame USB interface of receiving unit;
The AT89C2051 single-chip microcomputer is carried out wireless module initialization function C onfig2401 (), the configuration wireless transmitter module; Carry out the keyboard initialization, send a series of orders to keyboard and come reset button disc status indicator, Num LockLED and the machine that is provided with to beat initial work such as time-delay and speed;
The USB controller of the receiving end main frame USB device that resets, and distribute to the unique address of USB device; USB device sends descriptor and initialization information to main frame, main frame load driver program, the initial work of completion USB interface;
The clock line KCLK of AT89C2051 single-chip microcomputer poll keyboard PS2 interface J-K, if detecting keyboard presses shift key, clock line drags down, single-chip microcomputer reads shift key make code 12h and is emitted to receiving unit.Then, detect keyboard and press the G letter key, single-chip microcomputer reads G key make code 34h and is emitted to receiving unit; Discharge the G key, single-chip microcomputer sends G key short in size F0h 34h and is sent to receiving unit; Discharge shift key, single-chip microcomputer sends shift key short in size F0h 12h to receiving unit.Concrete process of transmitting all is that make code or short in size coding back are remained in the emission buffer memory as the emission data; It is emission mode that wireless transmitter module is set; The function R F2401_TxPacket () that sends through data adds coded message address information and sends into wireless transmitter module, and wireless transmitter module carries out transmitted at high speed with form of data frames after adding check information.
Wireless receiving module is set to receiving mode in the receiving unit; Read the corresponding coded message of sending of address code according to information of address bit with the cover wireless transmitter module; The CY7C68013 single-chip microcomputer in turn converts the data message that reads (like G key make code 34h) to the HID sign indicating number; And be saved to keyboard HID sign indicating number in the input-buffer of USB port 1, be saved to mouse HID sign indicating number in the input-buffer of USB port 2, and communicate with main frame.
Claims (3)
1. Wireless Keyboard and mouse receiving and transmitting device are used to realize it is characterized in that: comprise radiating portion and receiving unit based on the keyboard of PS2 interface standard and the radio communication between mouse and the main frame;
Said radiating portion comprises PS2 interface, emission processor and the wireless transmitter module that is used for being connected with mouse with keyboard; Keypad information and mouse message are transferred to the emission processor through the PS2 interface; The emission processor is transferred to wireless transmitter module to keypad information and the mouse message formed coded message of encoding, and carries out wireless transmission by wireless transmitter module; The AT89C2051 chip microcontroller of said emission processor adopting atmel corp; The USB interface that said receiving unit comprises wireless receiving module, receiving processor and is used for being connected with main frame; Wireless receiving module and wireless transmitter module are based upon the bidirectional serial communication on the 2.4GHz frequency; Wireless receiving module is sent to receiving processor after receiving the coded message that wireless transmitter module sends, and receiving processor is to coded message decoding gained keypad information and mouse message converts the HID data layout into after USB interface is transferred to main frame.
2. Wireless Keyboard and mouse receiving and transmitting device according to claim 1, it is characterized in that: said receiving processor adopts the CY7C68013 chip microcontroller in the Cypress Semiconductor EZ-USB FX2 of the company series.
3. Wireless Keyboard and mouse receiving and transmitting device according to claim 1 or claim 2, it is characterized in that: said wireless transmitter module adopts has the product that software is established address function, and said wireless receiving module adopts the product with response address calibration function.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8521942B2 (en) * | 2011-03-21 | 2013-08-27 | Microsoft Corporation | HID over simple peripheral buses |
| CN103235650A (en) * | 2013-04-17 | 2013-08-07 | 苏州市职业大学 | Dual-interface adjustable-power wireless mouse |
| CN104216852A (en) * | 2013-06-05 | 2014-12-17 | 苏州坤宏电子有限公司 | Wireless serial interface device achieving plug and play of HID through USB |
| CN105207747B (en) * | 2015-10-08 | 2019-01-22 | 中颖电子股份有限公司 | A kind of data transmission method based on HID protocol |
| CN105843773A (en) * | 2016-05-31 | 2016-08-10 | 上海康比利仪表有限公司 | Automatic identification method of function extension module of embedded system |
| CN107220190B (en) * | 2017-05-25 | 2024-03-08 | 无锡英斯特微电子有限公司 | System and method for realizing bidirectional information interaction with host driver by using custom USB mouse and keyboard |
| CN111930184B (en) * | 2020-10-13 | 2021-01-01 | 飞天诚信科技股份有限公司 | Method, device and system for realizing external equipment simulation keyboard |
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| CN2313243Y (en) * | 1997-11-25 | 1999-04-07 | 四川鼎天微电有限公司 | Keyboard input process for domestic multi-media system |
| CN101119133A (en) * | 2007-09-07 | 2008-02-06 | 倪郁青 | 2.4GHz frequency hopping technique based one-to-many fast synchronization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2313243Y (en) * | 1997-11-25 | 1999-04-07 | 四川鼎天微电有限公司 | Keyboard input process for domestic multi-media system |
| CN101119133A (en) * | 2007-09-07 | 2008-02-06 | 倪郁青 | 2.4GHz frequency hopping technique based one-to-many fast synchronization method |
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