CN210721444U - Serial port switching circuit and electronic equipment - Google Patents
Serial port switching circuit and electronic equipment Download PDFInfo
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- CN210721444U CN210721444U CN202020014773.6U CN202020014773U CN210721444U CN 210721444 U CN210721444 U CN 210721444U CN 202020014773 U CN202020014773 U CN 202020014773U CN 210721444 U CN210721444 U CN 210721444U
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Abstract
The utility model relates to a serial ports switching circuit and electronic equipment, wherein, serial ports switching circuit is used for electronic equipment, include: a first controller, a second controller, a first diode, and a second diode; the anode of the first diode and the anode of the second diode are both connected with the serial port receiving end of the first controller; the cathode of the first diode is connected with the serial port sending end of the second controller; the cathode of the second diode is used for being connected to a serial port sending end of the debugging equipment; the serial port transmitting end of the first controller is connected with the serial port receiving end of the second controller and is also used for being connected to the serial port receiving end of the debugging equipment. The utility model discloses in the debugging process, be convenient for switch into debugging equipment or second controller and first controller communication at any time to in time verify the debugging effect, be difficult for causing the damage to equipment.
Description
Technical Field
The utility model relates to an electronic circuit field, in particular to serial ports switching circuit and electronic equipment.
Background
With the development of modern technology, many electronic products need two serial chips. However, in the development process of electronic products with two chips, debugging of the core system chip is often required. In the conventional technology, the serial port between two chips needs to be disconnected, and then the serial port of the core system chip is connected with the serial port of a computer PC for debugging. After debugging is finished, the serial port connection between the core system chip and the computer needs to be disconnected, and the serial port connection between the two chips is recovered. In the conventional technology, a toggle switch or a jumper is generally adopted to disconnect the serial port connection between two chips. The toggle switch has higher cost and larger occupied area, the jumper needs to be operated by using tools such as soldering iron, tweezers and the like, and the circuit board is easy to damage in the process of debugging the jumper for many times.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a serial ports switching circuit and electronic equipment to not enough in the conventional art.
In one embodiment, the utility model provides a serial ports switching circuit, serial ports switching circuit are used for electronic equipment, include: a first controller, a second controller, a first diode, and a second diode;
the anode of the first diode and the anode of the second diode are both connected with the serial port receiving end of the first controller; the cathode of the first diode is connected with the serial port sending end of the second controller; the cathode of the second diode is used for being connected to a serial port sending end of the debugging equipment;
the serial port transmitting end of the first controller is connected with the serial port receiving end of the second controller and is also used for being connected to the serial port receiving end of the debugging equipment.
In one embodiment, the first diode and the second diode are formed by a common anode type double diode chip.
In one embodiment, the first controller is a system CPU chip of the electronic device; the second controller is a singlechip of the electronic equipment;
the system CPU chip is used for controlling the operation of each function of the electronic equipment;
the singlechip is used for awakening the system CPU chip by controlling a power circuit of the electronic equipment or controlling the system CPU chip to enter a dormant state.
In one embodiment, the debugging device is a computer device.
In one embodiment, the device further comprises a first resistor and a second resistor;
a serial port sending end of the first controller is respectively connected with one end of the first resistor and one end of the second resistor;
the other end of the first resistor is connected with a serial port receiving end of the second controller;
the other end of the second resistor is used for being connected to a serial port receiving end of the debugging equipment.
In one embodiment, the serial ports of the first controller, the second controller and the debugging device are UART communication serial ports.
In one embodiment, the electronic device further comprises a power circuit for the electronic device;
the power output end of the power circuit is connected with the power input end of the first controller, and the enabling end of the power circuit is connected with the control end of the second controller.
In one embodiment, the utility model also provides an electronic equipment, including serial ports switching circuit.
In one embodiment, the electronic device is a device with a built-in battery as a power supply.
In one embodiment, the electronic device is a surveillance camera.
The utility model provides a serial port switching circuit and electronic equipment, wherein, the serial port switching circuit is used for the electronic equipment, the positive pole of the first diode is connected with the serial port receiving terminal of the first controller, and the negative pole is connected with the serial port transmitting terminal of the second controller; the anode of the second diode is connected with the serial port receiving end of the first controller, and the cathode of the second diode is used for being connected to the serial port sending end of the debugging device. The serial port transmitting end of the first controller is connected with the serial port receiving end of the second controller and is also used for being connected to the serial port receiving end of the debugging equipment. Therefore, when the first controller is debugged through the debugging equipment, the first diode and the second diode can play a role in isolation so as to prevent a signal output by the second controller from causing an interference phenomenon to the debugging equipment. The utility model discloses simple structure is with low costs, and in the debugging process, be convenient for switch over into debugging equipment or second controller and first controller communication at any time to in time verify the debugging effect, can save the extra operation of breaking off first controller and second controller route, can improve debugging efficiency when improving the interference killing feature when debugging electronic equipment, the operation of being convenient for is difficult for causing the damage to equipment.
Drawings
Fig. 1 shows a schematic structural diagram of a serial port switching circuit in an embodiment of the present invention;
fig. 2 shows another schematic structural diagram of the serial port switching circuit in an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a serial port switching circuit in an embodiment of the present invention;
fig. 4 is a schematic diagram showing another structure of the serial port switching circuit in an embodiment of the present invention;
FIG. 5 shows a schematic diagram of a serial port switching circuit in the prior art;
fig. 6 shows a schematic structural diagram of an electronic device in an embodiment of the present invention.
Detailed Description
Hereinafter, various embodiments of the present invention will be described more fully. The present invention is capable of various embodiments and of being modified and varied therein. However, it should be understood that: there is no intention to limit the scope of the invention to the specific embodiments disclosed herein, but rather, the invention is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the invention.
Hereinafter, the terms "includes" or "may include" used in various embodiments of the present invention indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to refer only to the particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combination of the foregoing.
In various embodiments of the present invention, the expression "at least one of a or/and B" includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The term "user" as used in various embodiments of the present invention may indicate a person using an electronic device or a device using an electronic device (e.g., an artificial intelligence electronic device).
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. Terms such as those defined in commonly used dictionaries will be interpreted as having a meaning that is the same as a contextual meaning in the related art and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein in various embodiments of the present invention.
Referring to fig. 5, in the conventional serial port switching circuit 510, UART _ TX _ CPU and UART _ RX _ CPU are serial ports of a core system CPU, MCU _ TXD and MCU _ RXD are serial ports of a single chip MCU, and PC _ TXD and PC _ RXD are debugging serial ports of a computer PC. When the equipment normally works, the resistors R2 and R4 are disconnected, the resistors R1 and R3 are reserved, and serial ports between the CPU and the MCU are communicated through the paths of R1 and R3. When debugging is carried out, the resistors R1 and R3 are disconnected, the resistors R2 and R4 are reserved, and at the moment, the serial port between the CPU and the computer PC carries out communication through the paths of the resistors R2 and R4. When debugging is carried out, the resistors R1 and R3 must be disconnected, otherwise, because the MCU _ TXD also outputs signals, the MCU _ TXD can interfere the PC _ TXD to cause the disorder code of the computer screen. The four resistors R1, R2, R3 and R4 can be replaced by toggle switches, and the working principle of the toggle switches is equivalent to that of the resistors. But after debugging, the circuit of the resistors R1 and R3 needs to be switched back, so that the serial port between the CPU and the MCU can normally communicate. The utility model discloses a serial ports switching circuit and electronic equipment when switching to the debug mode, can save the operation of changing communication channel, convenient to use.
Referring to fig. 1, in an embodiment, the utility model provides a serial ports switching circuit for electronic equipment includes: a first controller 110, a second controller 120, a first diode D1, and a second diode D2.
The anode of the first diode D1 and the anode of the second diode D2 are both connected to the serial port receiving terminal RX1 of the first controller 110; the negative electrode of the first diode D1 is connected to the serial port transmitting terminal TX2 of the second controller 120; the cathode of the second diode D2 is used for connecting to the serial port transmitter TX3 of the debugging device 130.
The serial port transmitter TX1 of the first controller 110 is connected to the serial port receiver RX2 of the second controller 120, and is further configured to be connected to the serial port receiver RX3 of the debugging device 130.
The first controller 110 is, for example, a system main control chip in the electronic device for controlling the operation of each function of the electronic device, and the second controller 120 is, for example, a system sub-control chip in the electronic device for controlling the first controller to operate or sleep. Further, the first controller 110 and the second controller 120 may be any one or a combination of a CPU chip, a single chip, and the like.
In normal operation of the electronic device, the serial port RX1 of the first controller 110 communicates with the serial port TX2 of the second controller 120 through the first diode D1, and the serial port TX1 of the first controller communicates with the serial port RX2 of the second controller. When the serial port transmitting terminal TX2 of the second controller 120 transmits a high level signal through the first diode D1, the serial port receiving terminal RX1 of the first controller 110 maintains a high level due to an internal pull-up resistor, and the first diode D1 is turned off. When the serial port TX2 of the second controller 120 sends a low signal through the first diode D1, the first diode D1 is turned on at this time because the high level of the pull-up resistor inside the serial port RX1 of the first controller 110 is pulled down. When the first controller 110 transmits a signal, the signal may be transmitted to the serial port RX2 of the second controller 120 through its serial port TX 1.
When debugging is performed, the first controller 110 and the debugging device 130 communicate through the second diode D2, and the serial port transmitter TX1 of the first controller 110 communicates with the serial port receiver RX3 of the debugging device 130. When the serial port transmitting terminal TX3 of the debug device 130 transmits a high level signal to the serial port receiving terminal RX1 of the first controller 110 through the second diode D2, the second diode D2 is turned off because the pull-up resistance in the serial port receiving terminal RX1 of the first controller 110 maintains a high level. When the debug device 130 sends a low-level signal to the second diode D2 through the serial port transmitter TX3, the high level of the internal pull-up resistor of the serial port receiver RX1 of the first controller 110 is pulled low, and the second diode D2 is turned on.
The embodiment of the utility model provides a when debugging first controller 110, because first diode D1 and second diode D2 can play the effect of isolation, consequently, debugging equipment 130 need not to break off the communication path between second controller 120 and the first controller 110 through extra operation when communicating with first controller 110, can prevent that the signal that second controller 120 sent from scurrying debugging equipment 130, leads to debugging unusual phenomenon.
The utility model provides a serial ports switching circuit for electronic equipment if locate in the electronic equipment. The positive electrode of the first diode D1 is connected to the serial port receiving terminal RX1 of the first controller 110, and the negative electrode is connected to the serial port transmitting terminal TX2 of the second controller 120; the anode of the second diode D2 is connected to the serial port receiving terminal RX1 of the first controller 110, and the cathode is used for being connected to the serial port transmitting terminal TX3 of the debugging device 130. The serial port transmitter TX1 of the first controller 110 is connected to the serial port receiver RX2 of the second controller 120, and is further configured to be connected to the serial port receiver RX3 of the debugging device 130. Thus, when the first controller 110 is debugged by the debugging apparatus 130, the first diode D1 and the second diode D2 may perform an isolation function to prevent a signal output by the second controller 120 from causing a disturbance phenomenon to the debugging apparatus 130. The utility model discloses simple structure is with low costs, in the debugging process, is convenient for switch into debugging equipment 130 or second controller 120 and first controller 110 communication at any time to in time verify the debugging effect, can save the extra operation of breaking off first controller 110 and second controller 120 passageway, can improve debugging efficiency when improving the interference killing feature when debugging electronic equipment, the operation of being convenient for is difficult for causing the damage to equipment.
In a specific embodiment, the first diode and the second diode are formed by a common anode type of two-diode chip.
The utility model discloses serial ports switching circuit, double diode chip small in size adopts the double diode chip that is positive altogether can make the integrated level of circuit higher, can prevent single diode's reverse welding mistake, can improve signal transmission's reliability between first controller and second controller, the debugging equipment simultaneously.
Referring to fig. 2, in a specific embodiment, the first controller is a system CPU chip 210 of the electronic device; the second controller is a single chip 220 of the electronic device.
The system CPU chip 210 is used for controlling the functions of the electronic device.
The single chip 220 is used for waking up the system CPU chip 210 by controlling a power circuit of the electronic device, or controlling the system CPU chip 210 to enter a sleep state.
For example, in an electronic device with a built-in battery, in order to save power, the system CPU chip 210 is awakened or enters a sleep state by using a single chip 220 to control a power circuit of the electronic device, where UART _ TX _ CPU is a serial port transmitting terminal of the system CPU chip 210, and UART _ RX _ CPU is a serial port receiving terminal of the system CPU chip 210. When the system CPU chip 210 needs to be woken up, the single chip microcomputer 220 enables the power supply circuit to supply power to the system CPU chip 210, and after the system CPU chip 210 normally works, the single chip microcomputer 220 sends a signal to the serial port receiving end of the system CPU chip 210 through the serial port sending end TX2 to indicate which condition is triggered to wake up. When the system CPU chip 210 needs to enter the sleep mode, the system CPU chip 210 sends a power-off signal to the serial port receiving terminal RX2 sent by the single chip microcomputer 220 through the serial port sending terminal TX1, so that the single chip microcomputer 220 controls the power circuit to be disconnected to supply power to the system CPU chip 210, thereby saving electric energy and realizing a low power consumption function. When the system CPU chip 210 is debugged by the debugging device 230, the first diode D1 and the second diode D2 perform an isolation function to prevent the signal output by the single chip microcomputer 220 from causing interference to the debugging device 230.
The utility model discloses serial ports switching circuit is applicable to among the electronic equipment of low-power consumption, as in built-in battery as power supply's the electronic equipment, including the system CPU chip 210 that is used for controlling each function of electronic equipment to and be used for control system CPU chip 210 to get into the dormancy, or the singlechip 220 that awakens up, and first diode D1 and second diode D2, simple structure and easy realization, the cost is lower. And then the utility model discloses be convenient for electronic equipment when debugging through debugging equipment 230, switch into debugging equipment 230 or second controller and first controller communication at any time to in time verify the debugging effect, can save the extra operation of breaking off first controller and second controller route, can improve debugging efficiency when improving the interference killing feature when debugging electronic equipment, the operation of being convenient for is difficult for causing the damage to equipment.
In a particular embodiment, the commissioning device is a computer device.
The utility model discloses serial ports switching circuit, convenient to use can improve the efficiency of debugging.
Referring to fig. 3, in a specific embodiment, a first resistor Ra and a second resistor Rb are further included.
A serial port transmitting terminal TX1 of the first controller 310 is connected to one end of the first resistor Ra and one end of the second resistor Rb, respectively.
The other end of the first resistor Ra is connected to the serial port receiving terminal RX2 of the second controller 320.
The other end of the second resistor Rb is used to connect to a serial port receiving terminal RX3 of the debug device 330.
The utility model discloses serial ports switching circuit, perfect and simple easy realization of structure can play the overcurrent protection effect, guarantees that second controller 320 and debugging equipment 330 are through respective serial ports receiving terminal and first controller 310's serial ports transmitting terminal TX1 stable communication.
In a specific embodiment, the serial ports of the first controller, the second controller and the debugging device are UART communication serial ports.
The utility model discloses serial ports switching circuit, first controller, second controller and debugging equipment pass through UART communication serial ports communication, are applicable in most electronic equipment to help realizing when electronic equipment debugs, improve interference killing feature and guarantee signal transmission's stability, the operation of being convenient for simultaneously.
Referring to fig. 4, in one particular embodiment, a power supply circuit 440 for the electronic device is also included.
The power output terminal of the power circuit 440 is connected to the power input terminal VCC of the first controller 410, and the enable terminal EN of the power circuit 440 is connected to the control terminal GPIO of the second controller 420.
An electronic device that needs to save electric energy to achieve low power consumption generally has two controllers, for example, the first controller 410 is a system main control chip in the electronic device for controlling the operations of the functions of the electronic device, and the second controller 420 is a system sub-control chip in the electronic device for outputting a control signal to the enable terminal EN of the power circuit 440 through the GPIO port thereof so that the power circuit 440 is connected to or disconnected from the power input terminal VCC of the first controller 410, so as to operate or sleep the first controller 410. After the first controller 410 operates normally, the second controller 420 sends a signal to the serial port RX1 of the first controller 410 through the serial port TX2 to indicate which condition triggers the wakeup. When the first controller 410 needs to enter the sleep mode, a power-off signal is sent to the serial port receiving terminal RX2 of the second controller 420 through the serial port sending terminal TX1, so that the second controller 420 controls the power circuit 440 to disconnect the power input terminal VCC of the first controller 410.
The utility model discloses serial ports switching circuit, circuit structure is perfect, is applicable to the electronic equipment of low-power consumption, like the electronic equipment of built-in battery conduct power supply. Furthermore, the embodiment of the utility model provides a when electronic equipment is debugging through debugging equipment 430, the signal that second controller 420 sent can not cause crosstalk to debugging equipment 430 if awaken the trigger signal of first controller 410 up, can save the extra operation of breaking off first controller 410 and second controller 420 passageway, be convenient for realize switching into debugging equipment 430 or second controller 420 and first controller 410 communication at any time, verify the debugging effect, improve debugging efficiency.
Referring to fig. 6, in an embodiment, the present invention further provides an electronic device including a serial port switching circuit 610.
It should be noted that, for specific limitations of the serial port switching circuit 610 in this embodiment, reference may be made to the above limitations of the serial port switching circuit, and details are not described herein again.
The electronic device of the embodiment of the utility model comprises a serial port switching circuit 610, wherein the anode of a first diode is connected with the serial port receiving terminal of a first controller, and the cathode is connected with the serial port sending terminal of a second controller; the anode of the second diode is connected with the serial port receiving end of the first controller, and the cathode of the second diode is used for being connected to the serial port sending end of the debugging device. The serial port transmitting end of the first controller is connected with the serial port receiving end of the second controller and is also used for being connected to the serial port receiving end of the debugging equipment. Therefore, when the first controller is debugged through the debugging equipment, the first diode and the second diode can play a role in isolation so as to prevent a signal output by the second controller from causing an interference phenomenon to the debugging equipment. The utility model discloses simple structure is with low costs, and in the debugging process, be convenient for switch over into debugging equipment or second controller and first controller communication at any time to in time verify the debugging effect, can save the extra operation of breaking off first controller and second controller route, can improve debugging efficiency when improving the interference killing feature when debugging electronic equipment, the operation of being convenient for is difficult for causing the damage to equipment.
In a specific embodiment, the electronic device is a device with a built-in battery as a power supply.
The embodiment of the utility model provides an it is applicable to built-in battery as power supply's equipment, because this type of equipment possesses first controller and second controller. When debugging is carried out, the additional operation of disconnecting the first controller and the second controller can be omitted, the communication between the debugging equipment or the second controller and the first controller can be conveniently switched at any time, the debugging effect is verified, and the debugging efficiency is improved.
In a particular embodiment, the electronic device is a surveillance camera.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The sequence numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the implementation scenario. The above disclosure is only a few specific implementation scenarios of the present invention, however, the present invention is not limited thereto, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.
Claims (10)
1. A serial port switching circuit, wherein the serial port switching circuit is used for an electronic device, comprising: a first controller, a second controller, a first diode, and a second diode;
the anode of the first diode and the anode of the second diode are both connected with the serial port receiving end of the first controller; the cathode of the first diode is connected with the serial port sending end of the second controller; the cathode of the second diode is used for being connected to a serial port sending end of the debugging equipment;
and the serial port sending end of the first controller is connected with the serial port receiving end of the second controller and is also used for being connected to the serial port receiving end of the debugging equipment.
2. The serial port switching circuit of claim 1, wherein the first diode and the second diode are formed by a common anode type double diode chip.
3. The serial port switching circuit according to claim 1, wherein the first controller is a system CPU chip of the electronic device; the second controller is a singlechip of the electronic equipment;
the system CPU chip is used for controlling the operation of each function of the electronic equipment;
the single chip microcomputer is used for awakening the system CPU chip by controlling a power circuit of the electronic equipment or controlling the system CPU chip to enter a dormant state.
4. The serial port switching circuit according to claim 1, wherein the debugging device is a computer device.
5. The serial port switching circuit according to claim 2, further comprising a first resistor and a second resistor;
a serial port sending end of the first controller is respectively connected with one end of the first resistor and one end of the second resistor;
the other end of the first resistor is connected with a serial port receiving end of the second controller;
and the other end of the second resistor is used for being connected to a serial port receiving end of the debugging equipment.
6. The serial port switching circuit according to claim 1, wherein the serial ports of the first controller, the second controller and the debugging device are UART communication serial ports.
7. The serial port switching circuit according to any one of claims 1 to 6, further comprising a power supply circuit for the electronic device;
the power output end of the power circuit is connected with the power input end of the first controller, and the enabling end of the power circuit is connected with the control end of the second controller.
8. An electronic device characterized by comprising the serial port switching circuit according to any one of claims 1 to 7.
9. The electronic device according to claim 8, wherein the electronic device is a device having a built-in battery as a power supply source.
10. The electronic device of claim 9, wherein the electronic device is a surveillance camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020014773.6U CN210721444U (en) | 2020-01-02 | 2020-01-02 | Serial port switching circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020014773.6U CN210721444U (en) | 2020-01-02 | 2020-01-02 | Serial port switching circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN210721444U true CN210721444U (en) | 2020-06-09 |
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| CN202020014773.6U Active CN210721444U (en) | 2020-01-02 | 2020-01-02 | Serial port switching circuit and electronic equipment |
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| CN (1) | CN210721444U (en) |
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