CN108282493B - Wireless clock module and wireless timing method - Google Patents
Wireless clock module and wireless timing method Download PDFInfo
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- CN108282493B CN108282493B CN201810179293.2A CN201810179293A CN108282493B CN 108282493 B CN108282493 B CN 108282493B CN 201810179293 A CN201810179293 A CN 201810179293A CN 108282493 B CN108282493 B CN 108282493B
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/28—Timers or timing mechanisms used in protocols
Abstract
The invention provides a wireless clock module, which comprises a wireless timing circuit, an internal MCU, a crystal oscillator and an RTC chip; the crystal oscillator is in communication connection with the RTC chip and is used for driving the RTC chip to precisely run time; the wireless timing circuit and the RTC chip are respectively in communication connection with the internal MCU, the internal MCU is used for receiving timing instructions of a user and controlling the wireless timing circuit to acquire standard UTC time, and then timing is carried out on the RTC chip according to the standard UTC time; the wireless timing circuit is used for accessing an external NTP server under the control of the internal MCU and obtaining standard UTC time. The invention also provides a wireless timing method. The wireless timing module and the wireless timing method eliminate the accumulated error caused by the self precision in the local time running process in other timing schemes, so that the timing process is more convenient and quick and the precision is higher.
Description
Technical Field
The present invention relates to the field of wireless networks and computer applications, and in particular, to a wireless clock module and a wireless timing method.
Background
The existing Real Time Clock module (RTC module) generally needs manual timing, and is installed to equipment again after timing is finished, or is used for reference timing with another local Clock source, especially relates to the occasion that needs multiple equipment to always keep accurate timing, the timing mode is inconvenient to operate, accumulated errors are larger, and it is difficult to guarantee that multiple equipment keeps the same accurate timing simultaneously.
Disclosure of Invention
The invention aims to solve the problems of inconvenient timing and poor accuracy of a real-time clock module in the prior art, and provides a wireless clock module and a wireless timing method.
The wireless clock module comprises a wireless timing circuit, an internal MCU, a crystal oscillator and an RTC chip; the crystal oscillator is in communication connection with the RTC chip and is used for driving the RTC chip to accurately run before and after timing; the wireless timing circuit and the RTC chip are respectively in communication connection with the internal MCU, the internal MCU is used for receiving a timing instruction of a user, controlling the wireless timing circuit to acquire standard UTC time according to the timing instruction, and timing the RTC chip according to the standard UTC time; the wireless timing circuit is used for accessing an external NTP server under the control of the internal MCU and obtaining standard UTC time.
In a preferred embodiment, the wireless timing circuit is any one or any combination of WiFi, bluetooth, infrared and Zigbee timing circuits.
In a preferred embodiment, when the wireless timing circuit is a WiFi timing circuit, the wireless timing circuit includes a WiFi antenna and a WiFi chip; when the wireless timing circuit is a Bluetooth timing circuit, the wireless timing circuit comprises a Bluetooth antenna and a Bluetooth chip; when the wireless timing circuit is an infrared timing circuit, the wireless timing circuit comprises an infrared chip; when the wireless timing circuit is a Zigbee timing circuit, the wireless timing circuit comprises a Zigbee antenna and a Zigbee chip.
In a preferred embodiment, the wireless timing circuit is wirelessly connected with a router, the router is connected with the NTP server through a network cable, and the wireless timing circuit accesses the NTP server through the router and acquires standard UTC time.
In a preferred embodiment, the internal MCU receives the user's timing instructions through a communication connection with an external MCU, or with a cell phone APP/PC client.
In a preferred embodiment, when the internal MCU is communicatively connected to the external MCU, the internal MCU is communicatively connected to the external MCU through an SPI bus, an IIC bus, or a UART bus; when the internal MCU is in communication connection with the mobile phone APP/PC client, the internal MCU is in communication connection with the mobile phone APP/PC client through a TCP.
In a preferred embodiment, when the internal MCU is in communication connection with the external MCU through the IIC bus, pins to be connected include SCL, SDA and BUSY pins, where the SCL, SDA pins indicate that the internal MCU is connected to the external MCU through the IIC bus; the BUSY pin is an IIC BUSY signal indication pin.
In a preferred embodiment, when the internal MCU is in communication connection with the external MCU through the IIC bus, the pins to be connected further include a da_rec pin, where the da_rec pin is a signal indication pin for receiving network data by the wireless clock module, and is used for enabling the wireless clock module to perform network data transmission.
In a preferred embodiment, the wireless clock module further comprises a rechargeable battery and/or a power management circuit, wherein the rechargeable battery is electrically connected with the RTC chip and is used for supplying power to the RTC chip after power is off; the power management circuit is electrically connected with the wireless timing circuit and is used for converting voltage, so that the wireless clock module can adapt to an external power supply with a wide voltage range.
The invention also provides a wireless timing method, which comprises the following steps: step S1: the wireless timing circuit establishes wireless connection with the router; step S2: the internal MCU receives a timing instruction of a user and compares the timing instruction with a timing instruction prestored in the internal MCU, and when the timing instruction is consistent with the timing instruction, the internal MCU sends the timing instruction to the wireless timing circuit; step S3: the wireless timing circuit accesses an NTP server through a router and obtains standard UTC time, and then the standard UTC time is transmitted to the internal MCU; step S4: and after receiving the standard UTC time, the internal MCU converts the standard UTC time and corrects the time of the RTC chip according to the converted time information.
Compared with the prior art, the invention has the beneficial effects that:
the wireless clock module realizes the timing operation of the RTC chip through the wireless timing circuit, improves the method that the module needs to be manually disassembled during the RTC timing before, and is installed after the timing is finished, or simplifies the operation steps in a mode that a local clock source is used as a reference to copy time, has the characteristics of automation, programmability, practicability, accuracy and the like, eliminates the accumulated error caused by the self precision in the local time running process in other timing schemes, ensures that the timing process is more convenient and faster, and has higher timing accuracy.
Drawings
Fig. 1 is a schematic diagram of an internal structure of a wireless clock module according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an internal structure of a wireless clock module and a connection relationship between the internal structure and the external part according to an embodiment of the present invention.
FIG. 3 is a flow chart of the steps of a method of wireless timing in one embodiment of the invention.
Fig. 4 is a schematic diagram of a connection relationship between a wireless clock module and an external MCU according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a connection relationship between a wireless clock module and a mobile phone APP/PC client in an embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating an internal structure of a wireless clock module according to another embodiment of the present invention.
Detailed Description
The invention will be described in further detail with reference to the following detailed description and with reference to the accompanying drawings. Wherein like reference numerals refer to like parts throughout unless otherwise specified. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the invention or its applications.
In one embodiment, the wireless clock module 1 of the present invention, as shown in fig. 1, comprises a wireless timing circuit 11, an internal MCU12, a crystal oscillator 13 and an RTC chip 14, wherein the wireless timing circuit 11 and the RTC chip 14 are respectively connected with the internal MCU12 in a communication manner; the crystal oscillator 13 is in communication connection with the RTC chip 14 and is used for driving the RTC chip 14 to accurately run before and after timing. The internal MCU12 is used for receiving a timing instruction of a user, controlling the wireless timing circuit 11 to acquire standard UTC time according to the timing instruction, and timing the RTC chip 14 according to the standard UTC time; the wireless timing circuit 11 is used to access an external NTP (Net Time Protocol, network time protocol, abbreviated as "NTP") server and obtain a standard UTC time under the control of the internal MCU 12. In a preferred embodiment, the crystal 13 and the RTC chip 14 may be integrated for volume reduction.
In a specific embodiment of the present invention, the internal structure of the wireless clock module 1 and its connection relationship with the outside are shown in fig. 2. As can be seen in fig. 2, in this embodiment, the wireless timing circuit 11 is specifically a WiFi timing circuit, and includes a WiFi antenna 111 and a WiFi chip 112, where the WiFi antenna 111 and the WiFi chip 112 are connected through a radio frequency antenna, and the WiFi chip 112 is connected to the internal MCU12 through a UART bus, specifically through a receiving line RX and a transmitting line TX; in addition, the RTC chip is connected to the internal MCU via an IIC bus, in particular via a signal transmission line SCL and a data transmission line SDA. In this embodiment, the WiFi antenna 111 is wirelessly connected to the router 2, and the router 2 is connected to the NTP server 3 through a network cable, so that the WiFi antenna 111 of this embodiment can access the remote NTP server through the router 2 and obtain the standard UTC time by using the TCP/IP protocol.
In other variant embodiments, the WiFi chip 112 may also be connected to the internal MCU12 through other buses such as IIC or SPI; the RTC chip can be in communication connection with the internal MCU through the SPI bus, and the RTC chip belongs to the simple deformation or transformation of the scheme, and falls into the protection scope of the scheme.
In other variant embodiments, the wireless timing circuit 11 may be any one or any combination of bluetooth, infrared and Zigbee timing circuits, or the wireless timing circuit 11 may be any combination of bluetooth, infrared and Zigbee timing circuits and WiFi timing circuits, so as to achieve the effect of resource complementation, and improve the reliability of wireless connection. When the wireless timing circuit 11 is a bluetooth timing circuit, the wireless timing circuit 11 includes a bluetooth antenna and a bluetooth chip; when the wireless timing circuit 11 is an infrared timing circuit, the wireless timing circuit 11 includes an infrared chip; when the wireless timing circuit 11 is a Zigbee timing circuit, the wireless timing circuit 11 includes a Zigbee antenna and a Zigbee chip. Specifically, when the wireless timing circuit 11 is an infrared timing circuit, the router which needs to be externally connected also has infrared receiving and transmitting functions, time information data from the NTP server is converted into infrared coding data and is provided with a contracted data head. When the infrared chip in the router and the clock module is replaced by a zigbee chip or a bluetooth chip, the time correction function can be realized as well, and the description is omitted here.
In the following description, a WiFi timing circuit will be taken as an example, but the wireless timing circuit of the present invention is not meant to be a WiFi mode only, and any other timing circuit capable of establishing a wireless connection with a router, such as bluetooth, infrared, zigbee, etc., belongs to a simple modification or transformation of the present invention, and falls within the scope of protection of the present invention.
The flow of the method for performing wireless timing by the wireless clock module is shown in fig. 3, and step S1 is performed first, and the wireless timing circuit and the router are connected wirelessly. Specifically, when the internal MCU is started after the wireless clock module is powered on, whether the WiFi name and the password in the local area network are consistent with the WiFi name and the password which are set by default in the internal MCU program or not is automatically judged, the port connection condition is checked, connection can be performed if the WiFi name and the password are consistent with the WiFi name and the password, otherwise, the internal MCU program is dormant and waits, and the default WiFi name and the password in the internal MCU program can be changed by instructions through the external MCU.
After the wireless timing circuit establishes wireless connection with the router, step S2 is carried out, the internal MCU receives the timing instruction and compares the timing instruction with the timing instruction prestored in the internal MCU, when the timing instruction and the timing instruction are consistent, the internal MCU sends the timing instruction to a WiFi chip in the wireless timing circuit, and otherwise, the internal MCU is dormant all the time and waits for the triggering of the corresponding instruction.
After the internal MCU sends the timing instruction to the WiFi chip, step S3 is carried out, the WiFi chip receives the timing instruction and accesses the NTP server through the router to obtain the standard UTC time, and then the standard UTC time is transmitted to the internal MCU. Specifically, the WiFi chip obtains standard UTC time through the Daytime port connected to the NTP server, the Daytime service is a TCP-based application, the server listens at TCP port number 13, once a connection is established, returns date and time data in ASCII form, and after the connection is transferred, the connection is closed.
After the WiFi chip transmits the standard UTC time to the internal MCU, step S4 is performed, the internal MCU receives the standard UTC time data, detects whether the character string has "UTC" to determine whether the time format is accurate, then converts the time information into the format recognized by the RTC chip (mainly extracts clock information, performs calculation conversion, and adds 8 hours according to the time zone, for example, the eastern 8 th China region), and then performs timing on the RTC chip inside the module.
When the wireless clock module is applied, the timing instruction of the user can be received through the following two ways, as shown in fig. 4 and 5 respectively. In fig. 4, an internal MCU of the wireless clock module of the present invention is connected to a peripheral MCU, and pins to be connected are SCL, SDA, BUSY pins, and if network data transmission is to be performed, da_rec pins are also connected, where SCL and SDA pins represent that the internal MCU is connected to the peripheral MCU through an IIC bus; the BUSY pin is connected to the IO pin of the internal MCU, and is an IIC BUSY signal indication pin. In this embodiment, when the BUSY pin is defined as "1", it indicates an idle state, and at this time, the IIC bus may be operated by the external MCU to transmit signals or data to the internal MCU; and when the BUSY pin is 0, the BUSY pin is in a BUSY state, and at the moment, the transmission of signals or data to the internal MCU through the operation IIC bus of the external MCU is forbidden. Before the operation of the IIC bus is performed through the external MCU, the state of the BUSY pin must be read first, and the next operation can be performed when the state is idle.
In this embodiment, the internal MCU chip of the clock module has the functions of the master device and the slave device for IIC communication, and after the module is powered on, the internal MCU is initialized and detects whether the router is connected, and the internal MCU of the module is set to the slave device function by default, and waits for the instruction of the external MCU at this time, and when there is no instruction from the external MCU, the module enters the sleep waiting state. When the internal MCU receives a timing instruction of the external MCU, the status of the BUSY pin is changed from 1 to 0, and the internal MCU has a main equipment function, can control the WiFi chip to acquire standard UTC time, and perform timing on the RTC chip according to the standard UTC time. In this embodiment, the user may indirectly read time data information in the RTC chip or control the RTC chip through the external MCU, the internal MCU, and the IIC bus between the RTC chips. In other variant embodiments, as shown in fig. 4, the external MCU may also be directly connected to the RTC chip through the IIC bus, and at this time, the user may directly read the time data information in the RTC chip or control the RTC chip through the external MCU.
In this embodiment, the da_rec pin is a signal indication pin for the wireless clock module to receive network data, and when the da_rec pin is "1", the da_rec pin indicates an idle state, i.e. no network data is received, and when the da_rec pin is "0", the da_rec pin indicates a busy state, i.e. the wireless clock module has received network data from the PC/APP, and at this time, the da_rec pin only needs to directly read the data by using an IIC mode through an external MCU.
The wireless clock module (hereinafter referred to as a module) has a data transmission function, for example, the module sends data to a PC Client, a network debugging assistant is firstly opened on the mobile phone APP/PC Client, a network protocol is selected as a TCP Client mode, the module is firstly connected with a router through an instruction, then the connected module IP address can be queried through a network access router setting interface, if the module address is 192.168.0.2, or the IP address of the module is directly read through an instruction, the acquired module IP address is filled into a network debugging assistant menu option server IP frame, the server port number is 8080, the local IP address of the mobile phone APP/PC Client is checked, for example, the mobile phone APP/PC Client IP address is 192.168.0.3, then the external MCU opens the network transmission function of the module through an IIC instruction, the transmission type of the module is set as a TCP mode, and the IP address of the mobile phone APP/PC Client is transmitted to the internal MCU at the moment, if the module address is 192.168.0.3 and the port number 8080, then the external MCU sends the required data information to the internal MCU, and the data response information of the data debugging module can be received in the computer network assistant.
For another example, the module receives data sent by the mobile phone APP/PC client, firstly, a network debugging assistant of the mobile phone APP/PC client is opened, a network protocol is selected to be in a TCP Server mode, a local IP address 192.168.0.3 and a local port number 8080 of the mobile phone APP/PC client are respectively filled in, connection is clicked, at this time, the external MCU judges whether the value of the da_rec pin is "0", if so, the module has received network data from the mobile phone APP/PC client, then, the value on the SDA data line is directly read by using the IIC mode to be the data value sent by the PC client to the module, if so, the network debugging assistant waits continuously, if so, the internal singlechip is dormant, and the network connection is disconnected.
As can be seen from the above, in the embodiment shown in fig. 4, the user can complete all operations only by using IIC communication, the IIC communication is simple to operate and occupies less resources, and the user can implement complex network timing and data transmission functions by using only a few simple IIC operation instructions, so that the user does not need to know about network knowledge in depth, and can easily obtain useful network information.
When the wireless clock module is applied, a timing instruction of a user can be received through the mobile phone APP/PC client, as shown in fig. 5. In fig. 5, a mobile phone APP/PC client is connected to an internal MCU of a module through TCP communication, when a user wants to send a timing instruction to the internal MCU of the module through the mobile phone APP/PC client, a network debugging assistant of the mobile phone APP/PC client is first opened, a network protocol is selected as a TCP Server mode, local IP addresses, for example 192.168.0.3, and local port numbers, for example 8080, of the mobile phone APP/PC client are respectively filled in, and after that, the timing instruction can be sent to the internal MCU through the mobile phone APP/PC client. After receiving the timing instruction, the MCU can control the WiFi chip to acquire standard UTC time, and the specific timing process is similar to the flow steps shown in fig. 3, and will not be described herein. In the embodiment, the mobile phone APP/PC client is utilized to calibrate the clock module by using TCP communication, and the module is not required to be connected with an external MCU through a bus such as SPI, IIC, UART, so that the time calibrating process of the clock module is further simplified.
In a preferred embodiment, as shown in fig. 6, the wireless clock module of the present invention may further include a rechargeable battery 15 and/or a power management circuit 16, where the rechargeable battery 15 is electrically connected to the RTC chip and is used for supplying power to the RTC chip after power is off, so that the wireless clock module of the present invention can ensure that the running time is not disordered after long-time power is off, the timing process is not interfered by the outside, and high reliability is maintained; the power management circuit 16 is electrically connected to the wireless timing circuit 11, and is used for converting voltage and expanding the voltage selection range of a user. For example, in one embodiment, the operating voltage of the WiFi chip and the internal MCU is 3.3v, and the module can operate normally in the wide voltage range of 3v-5.5v of the external power supply through the power management circuit 16.
It should be pointed out that, according to the implementation requirements, each step/component described in the present application can be split into more steps/components, or two or more steps/components or part of operations of the steps/components can be combined into new steps/components, so as to achieve the purpose of the present invention, which belongs to the simple modification or transformation of the present application, and falls within the protection scope of the present application.
The wireless clock module realizes the timing operation of the RTC chip through the wireless timing circuit, improves the method that the module needs to be manually disassembled during the RTC timing before, and is installed after the timing is finished, or simplifies the operation steps in a mode that a local clock source is used as a reference to copy time, has the characteristics of automation, programmability, practicability, accuracy and the like, eliminates the accumulated error caused by the self precision in the local time running process in other timing schemes, ensures that the timing process is more convenient and faster, and has high timing accuracy.
The above-described wireless timing method of the present invention may be implemented in hardware, firmware, or as software or computer code storable in a recording medium such as a CD ROM, RAM, floppy disk, hard disk, or magneto-optical disk, or as computer code originally stored in a remote recording medium or a non-transitory machine-readable medium and to be stored in a local recording medium downloaded through a network, so that the method described herein may be stored on such software process on a recording medium using a general purpose computer, special purpose processor, or programmable or special purpose hardware such as an ASIC or FPGA. It is understood that a computer, processor, microprocessor controller, or programmable hardware includes a memory component (e.g., RAM, ROM, flash memory, etc.) that can store or receive software or computer code that, when accessed and executed by the computer, processor, or hardware, implements the processing methods described herein. Further, when the general-purpose computer accesses code for implementing the processes shown herein, execution of the code converts the general-purpose computer into a special-purpose computer for executing the processes shown herein.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several equivalent substitutions and obvious modifications can be made without departing from the spirit of the invention, and the same should be considered to be within the scope of the invention.
Claims (6)
1. The wireless clock module is characterized by comprising a wireless timing circuit, an internal MCU, a crystal oscillator and an RTC chip; the crystal oscillator is in communication connection with the RTC chip and is used for driving the RTC chip to accurately run before and after timing; the wireless timing circuit and the RTC chip are respectively in communication connection with the internal MCU, the internal MCU is in communication connection with the mobile phone APP/PC client to receive a timing instruction of a user, the wireless timing circuit is controlled to acquire standard UTC time according to the timing instruction, and then timing is carried out on the RTC chip according to the standard UTC time; the wireless timing circuit is used for accessing an external NTP server under the control action of the internal MCU and obtaining standard UTC time; the wireless timing circuit is an infrared timing circuit and comprises an infrared chip, the wireless timing circuit is connected with a router with infrared receiving and transmitting functions through infrared, the router is connected with the NTP server through a network cable, the wireless timing circuit accesses the NTP server through the router and obtains standard UTC time, time information data from the NTP server are converted into infrared coding data and provided with appointed data heads, the infrared timing circuit always receives infrared information, when an infrared effective data format with the time information is identified, the infrared effective data format with the time information is transmitted to the infrared chip, and the internal MCU reads the data of the infrared chip to realize timing of the RTC chip.
2. The wireless clock module of claim 1, wherein when the internal MCU is communicatively connected to the external MCU, the internal MCU is communicatively connected to the external MCU through an SPI bus, an IIC bus, or a UART bus; when the internal MCU is in communication connection with the mobile phone APP/PC client, the internal MCU is in communication connection with the mobile phone APP/PC client through a TCP.
3. The wireless clock module of claim 2, wherein when the internal MCU is communicatively connected to the external MCU via an IIC bus, the pins to be connected include SCL, SDA, and BUSY pins, the SCL, SDA pins indicating that the internal MCU is connected to the external MCU via the IIC bus; the BUSY pin is an IIC BUSY signal indication pin.
4. The wireless clock module of claim 3, wherein when the internal MCU is communicatively connected to the external MCU via the IIC bus, the pins to be connected further comprise a da_rec pin, the da_rec pin being a signal indication pin for the wireless clock module to receive network data, for enabling the wireless clock module to perform network data transmission.
5. The wireless clock module of any one of claims 1-4, further comprising a rechargeable battery and/or a power management circuit, the rechargeable battery being electrically connected to the RTC chip for powering the RTC chip after power failure; the power management circuit is electrically connected with the wireless timing circuit and is used for converting voltage, so that the wireless clock module can adapt to an external power supply with a wide voltage range.
6. A method of wireless timing, comprising the steps of:
step S1: the wireless timing circuit establishes wireless connection with the router;
step S2: the internal MCU is in communication connection with the mobile phone APP/PC client to receive the timing instruction of the user and compare the timing instruction with the timing instruction prestored in the internal MCU, and when the timing instruction is consistent with the timing instruction, the internal MCU sends the timing instruction to the wireless timing circuit;
step S3: the wireless timing circuit accesses an NTP server through a router and obtains standard UTC time, and then the standard UTC time is transmitted to the internal MCU;
step S4: after receiving the standard UTC time, the internal MCU converts the standard UTC time and corrects the time of the RTC chip according to the converted time information;
the wireless timing circuit is an infrared timing circuit and comprises an infrared chip, the wireless timing circuit is connected with a router with infrared receiving and transmitting functions through infrared, the router is connected with the NTP server through a network cable, the wireless timing circuit accesses the NTP server through the router and obtains standard UTC time, time information data from the NTP server are converted into infrared coding data and provided with appointed data heads, the infrared timing circuit always receives infrared information, when an infrared effective data format with time information is identified, the infrared effective data format with the time information is transmitted to the infrared chip, and the internal MCU reads the data of the infrared chip to realize timing of the RTC chip.
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| CN111756561A (en) * | 2019-03-28 | 2020-10-09 | 上海寰泰电子有限公司 | Clock initialization configuration method and device |
| CN113126694B (en) * | 2021-04-13 | 2023-08-04 | 山东英信计算机技术有限公司 | Time setting method, system, equipment and storage medium of computer management subsystem |
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