CN106406816A - An interface circuit used for firmware upgrade and an intelligent apparatus - Google Patents
An interface circuit used for firmware upgrade and an intelligent apparatus Download PDFInfo
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- CN106406816A CN106406816A CN201610829314.1A CN201610829314A CN106406816A CN 106406816 A CN106406816 A CN 106406816A CN 201610829314 A CN201610829314 A CN 201610829314A CN 106406816 A CN106406816 A CN 106406816A
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- stitch
- switch
- interface circuit
- nmos tube
- outfan
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/22—Microcontrol or microprogram arrangements
- G06F9/24—Loading of the microprogram
-
- 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
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Software Systems (AREA)
- Computer Hardware Design (AREA)
- Power Sources (AREA)
Abstract
The invention provides an interface circuit used for firmware upgrade and an intelligent apparatus. The interface circuit used for firmware upgrade comprises a USB interface, a first switch, a second switch, a pair of differential signal output ends for data interaction with firmware, a first output end used for outputting firmware upgrade data, and a second output end used for controlling whether the firmware should perform data interaction with the pair of differential signal output ends. The USB interface has a D+ pin, a D- pin and an ID pin, wherein the D+ pin and the D-pin are correspondingly connected to the pair of differential signal output ends, the D+ pin is connected to the first output end via the first switch, the D- pin is connected to the second output end via the second switch, and the ID pin outputs control signals controlling first switch states and second switch states to control ends of the first switch and the second switch. Firmware upgrade can be performed via the USB interface of the interface circuit and the USB interface can also be used for data interaction; the interface circuit is simple in design, low in cost and easy to realize.
Description
Technical field
A kind of the present invention relates to circuit design field, more particularly it relates to interface circuit for firmware upgrade
And smart machine.
Background technology
As a kind of emerging and independent artistic product, for moving towards consumption market, controllability has been gesture to Virtual Reality
Must go, therefore MCU (micro-control unit) has become the requisite part of VR equipment.Traditional MCU software upgrading mode
Upgrading pin is manually welded out to facilitate upgrading more by adopt, and this kind of mode needs to weld one by one, comparatively laborious, and in VR
Cannot be upgraded again after being assembled into whole machine, the convenience of therefore software upgrading is very important.USB is as now market VR
The standard configuration interface of product, integrated MCU upgrade function will become first-selected.
Content of the invention
It is an object of the present invention to provide a kind of new solution for firmware upgrade.
According to the first aspect of the invention, there is provided a kind of interface circuit for firmware upgrade, including USB interface,
One switch, second switch, for carrying out a pair of differential signal outputs of data interaction, be used for exporting firmware liter with described firmware
First outfan of DBMS and be used for controlling whether described firmware carries out data interaction with the pair of differential signal outputs
The second outfan, described USB interface has D+ stitch, D- stitch and ID stitch, and described D+ stitch is corresponding with described D- stitch
Connect to the pair of differential signal outputs, described D+ stitch also connects to described first outfan through described first switch,
Described D- stitch also connects to described second outfan, first switch described in described ID stitch output control through described second switch
The control signal of state and described second switch state, the control end to described first switch and described second switch.
Optionally, described first switch is provided by the first NMOS tube, and described second switch is provided by the second NMOS tube.
Optionally, the grid of described first NMOS tube connects to described ID stitch, and the source electrode of described first NMOS tube is even
It is connected to described first outfan, the drain electrode of described first NMOS tube connects to described D+ stitch；The grid of described second NMOS tube
Connect to described ID stitch, the source electrode of described second NMOS tube connects to described D- stitch, and the drain electrode of described second NMOS tube is even
It is connected to described second outfan.
Optionally, described interface circuit also includes power module, and the drain electrode of described first metal-oxide-semiconductor is through the first pull-up resistor
Connect to the voltage output end of described power module, the source electrode of described second metal-oxide-semiconductor connects to described electricity through the second pull-up resistor
Pressure outfan, the source electrode of drain electrode and described second NMOS tube that described power module is arranged to described first NMOS tube provides electricity
Pressure.
Optionally, described first outfan connects to described supply voltage outfan through the 3rd pull-up resistor.
Optionally, described ID stitch connects through a pull down resistor to the earth terminal of described USB interface.
Optionally, described interface circuit also includes three ESD protective device, and first ESD protective device is connected to institute
State between D+ stitch and the ground pin of described USB interface, second ESD protective device is connected to described D- stitch and described connects
Between ground stitch, the 3rd ESD protective device is connected between described ID stitch and described ground pin.
Optionally, described ESD protective device is Transient Voltage Suppressor.
Optionally, described USB interface is at least included in mini-USB interface, micro-USB interface and Type-C interface
Any one.
According to the second aspect of the invention, there is provided a kind of smart machine, including the above-mentioned interface for firmware upgrade electricity
Road.
It was found by the inventors of the present invention that in the prior art, there is existing MCU software upgrading mode needs manually will upgrade
Pin welds out problem that is comparatively laborious and cannot upgrading after being assembled into whole machine.In an embodiment of the present invention, Ke Yitong
The USB interface crossing interface circuit of the present invention carries out firmware upgrade, can also carry out data interaction by this USB interface, and set
Meter simple, with low cost, be easily achieved.Therefore, present invention technical assignment to be realized or technical problem to be solved
Be that those skilled in the art never expect or it is not expected that, therefore the present invention is a kind of new technical scheme.
By the detailed description to the exemplary embodiment of the present invention referring to the drawings, the further feature of the present invention and its
Advantage will be made apparent from.
Brief description
Combined in the description and the accompanying drawing of the part that constitutes description shows embodiments of the invention, and even
It is used for together explaining the principle of the present invention with its explanation.
Fig. 1 is a kind of frame principle figure of the enforcement structure according to a kind of interface circuit for firmware upgrade of the present invention；
Fig. 2 is a kind of circuit theory diagrams of the enforcement structure according to a kind of interface circuit for firmware upgrade of the present invention.
Description of reference numerals：
J1：USB interface； D+、D-：The difference stitch of USB interface；
ID：The ID stitch of USB interface； GND：The ground pin of USB interface；
VBUS：The power supply stitch of USB interface； K1、K2：Switch；
OUT+、OUT-：Differential signal outputs； P1：First outfan；
P2：Second outfan； Q1、Q2：NMOS tube；
D1、D2：The drain electrode of NMOS tube； S1、S2：The source electrode of NMOS tube；
G1、G2：The grid of NMOS tube； VCC：Voltage output end；
R1、R2、R3、R4：Resistance； ESD1、ESD2、ESD3：ESD protective device；
Control：Control signal.
Specific embodiment
To describe the various exemplary embodiments of the present invention now with reference to accompanying drawing in detail.It should be noted that：Unless other have
Body illustrates, the positioned opposite, numerical expression of the part otherwise illustrating in these embodiments and step and numerical value do not limit this
The scope of invention.
Description only actually at least one exemplary embodiment is illustrative below, never as to the present invention
And its application or any restriction using.
May be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
When in the case of, described technology, method and apparatus should be considered a part for description.
In all examples with discussion shown here, any occurrence should be construed as merely exemplary, and not
It is as restriction.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then do not need it is further discussed in subsequent accompanying drawing.
The D+ stitch of existing USB interface and D- stitch differential signal transmission when for data interaction, are used in USB interface
During firmware upgrade, D+ stitch is used for transmission upgrading data, and D- stitch is grounded；USB interface is mini-USB interface or micro-
During USB interface, also include ID stitch, ID stitch is used for identifying different cable end points, the ID in mini-A plug (i.e. A peripheral hardware)
Stitch is grounded, and the ID stitch in mini-B plug (i.e. B peripheral hardware) is hanging, when the equipment that OTG equipment detects ID stitch ground connection is recognized
For being A equipment (main frame), and the hanging equipment of ID stitch is detected and be then considered B device (peripheral hardware), be used for firmware in USB interface
When upgrading, being connected with replication tool by special USB line, replication tool will export 5V voltage to ID stitch.
In order to solve software upgrading mode present in prior art using artificial upgrading pin is welded out risen
Level, this kind of mode needs to weld one by one, comparatively laborious, and the problem that cannot be upgraded again after VR is assembled into whole machine, carry
Supply a kind of interface circuit for firmware upgrade, as shown in figure 1, the interface circuit of the present invention includes USB interface J1, first opens
Close K1, second switch K2, a pair of differential signal outputs OUT+, OUT- for carrying out data interaction with firmware, for exporting
First outfan P1 of firmware upgrade data and be used for controlling whether firmware is entered with a pair of differential signal outputs OUT+, OUT-
Second outfan P2 of row data interaction, wherein, data interaction is specially firmware and is entered by common standard USB data line and peripheral hardware
Row data exchange, is specifically referred to the data exchange between mobile phone and computer；Upgrading data is specifically for firmware upgrade, firmware
After receiving upgrading data, automatically upgraded；When second outfan P2 export high level when, the firmware of connection and a pair poor
Sub-signal outfan OUT+, OUT- carry out data interaction, and when the second outfan P2 exports low level, the firmware of connection is not with one
Data interaction is carried out to differential signal outputs OUT+, OUT-.
For example, it may be a pair of differential signal outputs OUT+, OUT- are respectively through the 3rd switch and the 4th switch and firmware
Stitch for receiving differential signal is corresponding to be connected, the control of the second outfan P2 output control the 3rd switch and the 4th on off state
Signal processed, when the second outfan P2 exports high level, the 3rd switch and the 4th switch are both turned on, when the second outfan P2 exports
During low level, the 3rd switch and the 4th switch all disconnect, and whether the level according to the second outfan is controlling firmware poor with a pair
Sub-signal outfan OUT+, OUT- carry out data interaction.
When firmware is for MCU, a pair of differential signal outputs OUT+, OUT- and MCU can be used for carrying out differential signal
A pair of difference stitch of interaction connects, and the first outfan is used for the stitch such as SWIM stitch receiving upgrading data even with MCU
Connect, the second outfan P2 and MCU are used for controlling the stitch such as asynchronous reset of a pair of difference stitch whether differential signal transmission
Stitch NRST connects.
USB interface J1 has D+ stitch, D- stitch, ID stitch, power supply stitch VBUS and ground pin GND, D+ stitch and
D- stitch is correspondingly connected to a pair of differential signal outputs OUT+, OUT-, and D+ stitch also connects to first defeated through first switch K1
Go out and hold P1, D- stitch also connects to the second outfan P2 through second switch K2, ID stitch output control first switch K1 state and
Control signal control of second switch K2 state, the control end to first switch K1 and second switch K2, specifically, control
In the case that signal control is high level, first switch K1 and second switch K2 turn on；Control signal control is low electricity
In the case of flat, first switch K1 and second switch K2 all disconnect.
When interface circuit is, for example, that computer, power supply adaptor etc. are connected through generic USB data wire and peripheral hardware, ID stitch hangs
Empty or is connected with ground pin GND, export low level, that is, control signal control is low level, first switch K1 and second
Switch K2 all disconnects, and D+ stitch and D- stitch are by differential signal transmission, and D- stitch output high level is to the second outfan P2, with
Control the firmware connecting and a pair of differential signal outputs OUT+, OUT- to carry out data interaction, and the first outfan P1 is not defeated
Go out signal, therefore, interface circuit of the present invention is equivalent to common USB data transmission interface circuit, is in normal USB mode.
In a specific embodiment of invention, ID stitch connects to the earth terminal of USB interface through a pull down resistor R4
GND, so, in the case that ID stitch is hanging, connects to earth terminal GND through pull down resistor R4, ID stitch is stable by exporting
Low level signal, this guarantees when interface circuit is not to be connected with replication tool but be connected with common USB data line,
The output of ID stitch and ground pin identical low level.
When interface circuit is connected with replication tool through special USB line, ID stitch exports high level, i.e. control signal
Control is high level, and first switch K1 and second switch K2 are both turned on, and D+ stitch will export upgrading data to the first outfan
P1, D- stitch is connected with ground pin GND, output low level to the second outfan P2, then the firmware connecting not with a pair of difference
Signal output part OUT+, OUT- carry out data interaction, and firmware will be upgraded according to upgrading data, and interface circuit of the present invention can
For use as firmware upgrade interface circuit, it is in upgrade mode.So, the data wire form that interface circuit connects different so that ID
The level of stitch different it becomes possible to realize the switching between the normal USB mode of interface circuit and upgrade mode, and in upgrading mould
In the case of formula, firmware and a pair of differential signal outputs OUT+, OUT- carry out data interaction, therefore avoid in escalation process
The interference to firmware normal work of middle D+ stitch and D- stitch, thus reaching the effect of easily firmware updating, and circuit design
Simply be easily achieved, with low cost, stable performance.
Wherein, USB interface J1 is at least any one in mini-USB interface, micro-USB interface and Type-C interface.
Further, in being embodied as at one of the present invention, first switch K1 is provided by the first NMOS tube Q1, and second opens
Closing K2 is provided by the second NMOS tube Q2, and specific connected mode can be：The grid G 1 of the first NMOS tube Q1 connects to ID stitch,
The source S 1 of the first NMOS tube Q1 connects to the first outfan P1, and the drain D 1 of the first NMOS tube Q1 connects to D+ stitch；Second
The grid G 2 of NMOS tube Q2 connects to ID stitch, and the source S 2 of the second NMOS tube Q2 connects to D- stitch, the second NMOS tube Q2
Drain D 2 connects to the second outfan P2.
On this basis, interface circuit also includes power module, and this power module for example can also be powered for firmware, for example
Supply voltage needed for firmware can be but be not limited to 3.3V, power module can export the voltage of 3.3V to voltage output end
The drain D 1 of VCC, the first metal-oxide-semiconductor Q1 connects to voltage output end VCC, the source electrode of the second metal-oxide-semiconductor Q2 through the first pull-up resistor R1
S2 connects to voltage output end VCC through the second pull-up resistor R2, and power module U1 is positioned to provide voltage to the first metal-oxide-semiconductor Q1
Drain D 1 and the second NMOS tube Q2 source S 1.
So, in the case of control signal control is low level, the grid G 1 of the first NMOS tube Q1 and the 2nd NMOS
The equal input low level of grid G 2 of pipe Q2, the first NMOS tube Q1 and the cut-off of the second NMOS tube Q2, now, the source of the first NMOS tube Q1
Pole S1 does not export；The source S 2 of the second NMOS tube Q2 is connected with the voltage of 3.3V, NMOS tube in the off state, source electrode and leakage
Pole is equivalent to and is connected with the diode that a positive pole is connected to source electrode, and the cut-in voltage of such as this diode is 0.3V, then, the
The drain D 2 of two NMOS tube Q2 then exports the high level of 3V to the second outfan P2, to control firmware and a pair of differential signal output
OUT+, OUT- carry out data interaction at end.
In the case that control signal control is high level, the grid Q1 of the first NMOS tube Q1 and the second NMOS tube Q2
The equal input high level of grid G 2, the first NMOS tube Q1 and the second NMOS tube Q2 conducting, now, the drain D 1 of the first NMOS tube is defeated
Enter the upgrading data of D+ transmission, this upgrading data is sent to the first outfan P1 by source S 1；The source S 2 of the second NMOS tube Q2
The low level signal of input D- transmission, therefore, drain D 2 will transmit low level signal to the second outfan P2, to control firmware not
Carry out data interaction with a pair of differential signal outputs OUT+, OUT-.
First outfan P1 can connect to supply voltage outfan VCC through the 3rd pull-up resistor R3, in such manner, it is possible to increase
The driving force of the first outfan P1 and the second outfan P2 is it is ensured that first defeated after first switch K1 and second switch K2 conducting
Go out to hold the electric current abundance on P1 and the second outfan P2 outlet line, what external software can be stable is entered by the first outfan P1
Row upgrading.
Further, the power supply stitch VBUS of USB interface J1 can also export 5V voltage for charging for firmware, above-mentioned electricity
The 5V voltage conversion of input can also be 3.3V by source module.
Because interface circuit is possibly exposed outside, in order to avoid due to being, for example, that staff touches the electrostatic docking producing
Mouthful circuit causes to damage, and in one particular embodiment of the present invention, interface circuit also includes three ESD protective device, and first
Individual ESD protective device is connected between D+ stitch and the ground pin of USB interface, and second ESD protective device is connected to D- pin
Between foot and ground pin, the 3rd ESD protective device is connected between ID stitch and ground pin, in this manner it is possible to USB
Circuit plays good ESD protection effect.Wherein, ESD protective device can be Transient Voltage Suppressor TVS, varistor, gather
In fit device and diode any one.
Because Transient Voltage Suppressor possesses low clamped voltage, to provide, effective ESD protection and response time be fast, encapsulation
The advantages of integrated level is high, repeat usage is high, in one particular embodiment of the present invention, ESD protective device uses wink
State voltage suppressor.
Present invention also offers a kind of smart machine, including the above-mentioned interface circuit for firmware upgrade.Smart machine is also
Including the firmware needing upgrading, for example, can be MCU.
This smart machine can be for example that virtual implementing helmet, VR glasses etc. need to carry out the smart machine of firmware upgrade.
The description of the various embodiments described above primary focus and the difference of other embodiment, but those skilled in the art should be clear
Chu, the various embodiments described above can be used alone as needed or be combined with each other.
Although being described in detail to some specific embodiments of the present invention by example, the skill of this area
Art personnel it should be understood that example above is merely to illustrate, rather than in order to limit the scope of the present invention.The skill of this area
Art personnel are it should be understood that can modify to above example without departing from the scope and spirit of the present invention.This
Bright scope is defined by the following claims.
Claims (10)
1. a kind of interface circuit for firmware upgrade is it is characterised in that include：USB interface (J1), first switch (K1),
Two switch (K2), for carrying out a pair of differential signal outputs (OUT+, OUT-) of data interaction, being used for exporting with described firmware
First outfan (P1) of firmware upgrade data and being used for control described firmware whether with the pair of differential signal outputs
(OUT+, OUT-) carries out second outfan (P2) of data interaction, and described USB interface (J1) has D+ stitch, D- stitch and ID
Stitch, described D+ stitch and described D- stitch are correspondingly connected to the pair of differential signal outputs (OUT+, OUT-), described D+
Stitch also connects to described first outfan (P1) through described first switch (K1), and described D- stitch is also through described second switch
(P2) connect to described second outfan (P2), first switch (K1) state and described second described in described ID stitch output control
The control signal (control) of switch (K2) state, the control end to described first switch (K1) and described second switch (K2).
2. interface circuit according to claim 1 is it is characterised in that described first switch (K1) is by the first NMOS tube (Q1)
There is provided, described second switch (K2) is provided by the second NMOS tube (Q2).
3. interface circuit according to claim 2 is it is characterised in that the grid (G1) of described first NMOS tube (Q1) connects
To described ID stitch, the source electrode (S1) of described first NMOS tube (Q1) connects to described first outfan (P1), and described first
The drain electrode (D1) of NMOS tube (Q1) connects to described D+ stitch；The grid (G2) of described second NMOS tube (Q2) connects to described ID
Stitch, the source electrode (S2) of described second NMOS tube (Q2) connects to described D- stitch, the drain electrode of described second NMOS tube (Q2)
(D2) connect to described second outfan (P2).
4. interface circuit according to claim 3 is it is characterised in that described interface circuit also includes power module, described
The drain electrode (D1) of the first metal-oxide-semiconductor connects to the voltage output end of described power module (VCC) through the first pull-up resistor (R1), described
The source electrode (S2) of the second metal-oxide-semiconductor connects to described voltage output end (VCC), described power module through the second pull-up resistor (R2)
(VCC) source electrode (S2) of the drain electrode (D1) and described second NMOS tube (Q2) that are arranged to described first NMOS tube (Q1) provides electricity
Pressure.
5. interface circuit according to claim 4 is it is characterised in that described first outfan (P1) is through the 3rd pull-up resistor
(R3) connect to described supply voltage outfan (VCC).
6. interface circuit according to claim 1 it is characterised in that described ID stitch through a pull down resistor (R4) connect to
The earth terminal (GND) of described USB interface.
7. interface circuit according to claim 1 is it is characterised in that described interface circuit also includes three ESD protectors
Part (ESD1, ESD2, ESD3), first ESD protective device (ESD1) is connected to the ground connection of described D+ stitch and described USB interface
Between stitch (GND), second ESD protective device (ESD2) is connected between described D- stitch and described ground pin (GND),
3rd ESD protective device (ESD3) is connected between described ID stitch and described ground pin (GND).
8. interface circuit according to claim 7 is it is characterised in that described ESD protective device (ESD1, ESD2, ESD3)
For Transient Voltage Suppressor.
9. interface circuit according to claim 1 is it is characterised in that described USB interface (J1) at least includes mini-USB
In interface, micro-USB interface and Type-C interface any one.
10. a kind of smart machine is it is characterised in that include the interface circuit any one of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610829314.1A CN106406816A (en) | 2016-09-18 | 2016-09-18 | An interface circuit used for firmware upgrade and an intelligent apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610829314.1A CN106406816A (en) | 2016-09-18 | 2016-09-18 | An interface circuit used for firmware upgrade and an intelligent apparatus |
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| CN201610829314.1A Pending CN106406816A (en) | 2016-09-18 | 2016-09-18 | An interface circuit used for firmware upgrade and an intelligent apparatus |
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| CN108763132A (en) * | 2018-05-18 | 2018-11-06 | 苏州佳世达光电有限公司 | A kind of download upgrading fixture |
| CN111446693A (en) * | 2019-01-17 | 2020-07-24 | 鸿富锦精密电子(郑州)有限公司 | Protection circuit and USB transmission device applying same |
| CN112445505A (en) * | 2019-08-29 | 2021-03-05 | 北京小米移动软件有限公司 | Electronic equipment and equipment control method and device |
| CN110908689A (en) * | 2019-11-27 | 2020-03-24 | 杭州莱宸科技有限公司 | Program upgrading interface circuit, embedded device, downloading interface circuit and downloader |
| CN110908689B (en) * | 2019-11-27 | 2023-09-15 | 杭州莱宸科技有限公司 | Program upgrade interface circuit, embedded device, download interface circuit, and downloader |
| CN112073885A (en) * | 2020-07-28 | 2020-12-11 | 深圳市韶音科技有限公司 | Bone conduction hearing aid |
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