CN107239422A - A kind of lossless method for receiving bursty data of TTL serial ports under low-power consumption mode - Google Patents
A kind of lossless method for receiving bursty data of TTL serial ports under low-power consumption mode Download PDFInfo
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- CN107239422A CN107239422A CN201710451086.3A CN201710451086A CN107239422A CN 107239422 A CN107239422 A CN 107239422A CN 201710451086 A CN201710451086 A CN 201710451086A CN 107239422 A CN107239422 A CN 107239422A
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- 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
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The present invention relates to a kind of lossless method for receiving bursty data of TTL serial ports under low-power consumption mode, the technical problem of bursty data frame of main website can not effectively be received under low-power consumption mode by which solving existing single-chip microcomputer.Its Tx for including TTL serial ports sends pin, Rx with receiving pin, Gnd pin and the I/O pin with Rx reception pins in parallel, serial port module is in initialization, interrupting input pin is set to the Rx I/O pins for receiving pins in parallel and enables trailing edge interruption, when receiving bursty data, the start bit trailing edge of first character section can trigger I/O pin and interrupt wake-up single-chip microcomputer, single-chip microcomputer enables the receive capabilities that Rx receives pin, the complete data frame for receiving main website burst immediately.The present invention is widely used in serial data communication technical field.
Description
Technical field
The present invention relates to a kind of serial data communication technical field, gone here and there in particular to TTL under a kind of low-power consumption mode
The lossless method for receiving bursty data of mouth.
Background technology
The measuring instruments such as intelligent calorimeter, water meter, are battery-powered equipment, with the use longevity up to 5 to 10 years
Life.In order to which the single-chip microcomputer reduced in electric quantity consumption, equipment can periodically enter into low-power consumption mode.It is single under low-power consumption mode
The master clock of piece machine is generally in halted state, and now most of peripheral circuit is also at resting state, it is necessary to called out in single-chip microcomputer
It could start normal work after waking up.For the widely used Transistor-Transistor Logic level serial port circuit in single-chip microcomputer, how in low-power consumption
The bursty data frame of intact reception main website is always the technological difficulties of single chip application under pattern.
The TTL serial datas of current single-chip microcomputer, which are received, typically following several schemes：
1st, communication two party increases an I/O pin and waken up for main website.This mode is simple and reliable, but is not for prominent
The situation of hair, I/O pin is waken up in advance before communication.Turn TTL serial ports in for example long-range RS485 of many application scenarios to read
There was only two lines in table, additional wires can not be increased, this serial ports with standard is incompatible, so using being restricted.
2nd, increase lead data, special wake-up association or particular address.It is actually to utilize loss to increase lead data
Lead data ensure the integrality of follow-up data, special wake-up association or particular address be mainly each hardware chip and make by oneself
The function of justice.The data content of many application scenarios is uncontrollable, and user is possible to self-defined and sends any data value, so
This is not general solution.
3rd, part single-chip microcomputer is designed with special low-power consumption serial ports.But this serial ports is once enabled, power consumption still has
Increased, requirement can not be met for power consumption requirements very harsh occasion.
The content of the invention
The present invention be exactly in order to solve existing above-mentioned technical problem there is provided a kind of communication line that need not increase both sides or
Person increases extra data frame, and the lossless reception bursty data of TTL serial ports under the low-power consumption mode of any data byte is not lost
Method.
The present invention provides TTL serial ports under a kind of low-power consumption mode the lossless method for receiving bursty data, including single-chip microcomputer and
Main website, single-chip microcomputer is provided with TTL serial port modules and I/O pin, and the Tx of TTL serial port modules sends pin and the Rx pins of main website are connected,
The Rx of TTL serial port modules receives pin and the Tx pins of main website are connected, the Gnd pins of TTL serial port modules and the Gnd pins of main website
Connection, the Rx reception pins of TTL serial port modules are in parallel with I/O pin；
The lossless method for receiving bursty data of TTL serial port modules includes：
Step 1, TTL serial port modules are initialized；
Step 2, set the I/O pin of single-chip microcomputer to be input, and enable the trailing edge of I/O pin and interrupt；
Step 3, single-chip microcomputer enters low-power consumption mode, and it is high level, the IO of single-chip microcomputer that the Rx of TTL serial port modules, which receives pin,
Pin is high level；
Step 4, main website sends bursty data frame, start bit one bit wide of generation of the first character section of bursty data frame
I/O pin of the low level to single-chip microcomputer, the I/O pin of single-chip microcomputer is from high level into low level trailing edge saltus step, and triggering IO draws
Pin is interrupted, and single-chip microcomputer is waken up, into interrupt handling routine；
Step 5, in interrupt handling routine, single-chip microcomputer enables TTL serial port module receive capabilities, starts to receive complete dash forward
Send out data frame.
The present invention also provides TTL serial ports under a kind of low-power consumption mode the lossless method for receiving bursty data, including single-chip microcomputer
And main website, single-chip microcomputer is provided with TTL serial port modules, and the Tx of TTL serial port modules sends pin and the Rx pins of main website are connected, TTL strings
The Rx of mouth mold block receives pin and the Tx pins of main website are connected, and the Gnd pins of TTL serial port modules and the Gnd pins of main website are connected；
The lossless method for receiving bursty data of TTL serial port modules includes：
Step 1, TTL serial port modules are initialized, and wherein Rx pins are set to IO input functions；
Step 2, the trailing edge for enabling Rx pins is interrupted；
Step 3, single-chip microcomputer enters low-power consumption mode, and it is high level that the Rx of TTL serial port modules, which receives pin,；
Step 4, main website sends bursty data frame, start bit one bit wide of generation of the first character section of bursty data frame
Rx pin of the low level to TTL serial port modules, the Rx pins of TTL serial port modules are from high level to low level trailing edge saltus step
In, triggering Rx pins are interrupted, and single-chip microcomputer are waken up, into interrupt handling routine；
Step 5, in interrupt handling routine, single-chip microcomputer closes the I/O interrupt function of Rx pins, enables TTL serial port modules and connects
Function is received, starts to receive complete bursty data frame.
Preferably technical scheme is, when serial communication baud rate is more than 2400bps, if interrupt pin wakes up single
Piece machine receives the judgement of pin start bit to the time for enabling serial ports reception more than Rx, then receives bit width of the pin according to baud rate
Simulation has received first complete bytes, and serial ports receive capabilities are enabled since second byte, receives complete bursty data
Frame.
The beneficial effects of the invention are as follows communication line or the extra data frame of increase without increasing communication two party should
It is real-time to bursty data, any data byte, the serial equipment of compatibility standard are not lost, it is adaptable to various low-power consumption monolithics
Machine.
Further aspect of the present invention, by the description of detailed description below, is clearly stated that.
Brief description of the drawings
Fig. 1 is Principle of Communication figure between the TTL serial port modules and I/O pin of single-chip microcomputer and outside main website；
Fig. 2 is the method flow diagram that single-chip microcomputer receives bursty data using the TTL serial port modules of I/O pin；
Fig. 3 is the method flow diagram that single-chip microcomputer receives bursty data without using the TTL serial port modules of I/O pin；
Fig. 4 is the system number 0x55 of 2400bps communication baud rates 16 bursty data frame schematic diagram.
Symbol description in figure：
10. single-chip microcomputer, 20. main websites；Bursty data frame in Fig. 4 stops including 1 start bit, 8 data bit, 1 even parity bit, 1
Stop bit.
Embodiment
Referring to the drawings, the present invention is described in further detail with specific embodiment.
Embodiment 1
As shown in figure 1, single-chip microcomputer 10 is provided with TTL serial port modules and I/O pin, the Tx of TTL serial port modules sends pin and master
Stand 20 the connection of Rx pins, the Rx of TTL serial port modules receives pin and is connected with the Tx pins of main website 20, the Gnd of TTL serial port modules
Pin is connected with the Gnd pins of main website 20, and the Rx reception pins of TTL serial port modules are in parallel with I/O pin.
As shown in Fig. 2 under single-chip microcomputer low-power consumption mode, the method that TTL serial port modules receive bursty data includes：
Step S201：Single-chip microcomputer power-up initializing.
Step S202：TTL serial port modules are initialized, enable respectively Tx send pin and Rx receive pin serial ports send and
Serial ports receive capabilities.
Step S203：It is input to set the I/O pin of single-chip microcomputer, and enables the interruption of I/O pin trailing edge.Rx receive pin with
I/O pin is not interfere with each other.
Step S204：Single-chip microcomputer normal work, into low-power consumption mode, when no data is communicated, the Rx of TTL serial port modules connects
Spasm pin is high level, and the I/O pin of single-chip microcomputer is high level.
Step S205：Main website 20 sends bursty data frame, the starting of the first character section of bursty data frame as shown in Figure 4
Position produces I/O pin of the low level of a bit wide to single-chip microcomputer, and the I/O pin of single-chip microcomputer is from high level to low level trailing edge
In saltus step, triggering I/O pin is interrupted, and single-chip microcomputer is waken up, into interrupt handling routine.
Step S206：In interrupt handling routine, single-chip microcomputer enables TTL serial port module receive capabilities immediately, receives complete
Bursty data frame.When serial communication baud rate is 2400bps, starting bit width is 417us.I/O pin wakes up single-chip microcomputer to opening
Received with serial ports generally in 20us or so, the start bit for not influenceing Rx to receive pin judges.It is higher for serial communication baud rate, surpass
2400bps situation is crossed, is sentenced if I/O pin wake-up single-chip microcomputer receives pin start bit to the time for enabling serial ports reception more than Rx
Disconnected time, I/O pin has received first character section according to the bit width simulation of baud rate, and string is enabled since second byte
Mouth receive capabilities.
Embodiment 2
As shown in figure 1, single-chip microcomputer 10 is provided with TTL serial port modules and I/O pin, the Tx of TTL serial port modules sends pin and master
Stand 20 the connection of Rx pins, the Rx of TTL serial port modules receives pin and is connected with the Tx pins of main website 20, the Gnd of TTL serial port modules
Pin is connected with the Gnd pins of main website 20.The Rx of TTL serial port modules receives pin and is not connected to I/O pin.
As shown in figure 3, under single-chip microcomputer low-power consumption mode, the method that TTL serial port modules receive bursty data includes：
Step S301：Single-chip microcomputer power-up initializing.
Step S302：TTL serial port modules are initialized, and enable the serial ports sending function that Tx sends pin, and Rx receives pin and set
It is set to IO inputs.
Step S303：The trailing edge for enabling Rx pins is interrupted.
Step S304：Single-chip microcomputer normal work, into low-power consumption mode, when no data is communicated, the Rx of TTL serial port modules connects
Spasm pin is high level.
Step S305：Main website 20 sends bursty data frame, the starting of the first character section of bursty data frame as shown in Figure 4
Position produces Rx pin of the low level of a bit wide to TTL serial port modules, and the Rx pins of TTL serial port modules are from high level to low electricity
In flat trailing edge saltus step, triggering Rx pins are interrupted, and single-chip microcomputer are waken up, into interrupt handling routine.
Step S306：In interrupt handling routine, single-chip microcomputer closes the I/O interrupt function of Rx pins immediately, enables TTL strings
Mouth mold block receive capabilities, start to receive complete bursty data frame.
When serial communication baud rate is more than 2400bps, if the Rx of TTL serial port modules receives pin and wakes up monolithic
Machine receives the time of pin start bit judgement to the time for enabling serial ports reception more than Rx, then Rx receives pin according to baud rate
Bit width simulation has received first complete bytes, and serial ports receive capabilities are enabled since second byte, receives complete dash forward
Send out data frame.
Above method is applied to the communication modes that single-chip microcomputer its own interfaces use TTL circuits, while being also applied for single-chip microcomputer
The communication modes of other circuits, other communication modes such as RS232, RS485 are converted to using TTL between main website.
It is described above to be not intended to limit the invention only to the preferred embodiments of the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.
Claims (3)
1. a kind of lossless method for receiving bursty data of TTL serial ports under low-power consumption mode, it is characterised in that：
Including single-chip microcomputer and main website, the single-chip microcomputer is provided with TTL serial port modules and I/O pin, and the Tx of the TTL serial port modules is sent out
The Rx pins of pin and main website are sent to connect, the Rx of TTL serial port modules receives pin and the Tx pins of main website are connected, TTL serial ports moulds
The Gnd pins of block and the Gnd pins of main website are connected, and the Rx reception pins of TTL serial port modules are in parallel with I/O pin；
The lossless method for receiving bursty data of the TTL serial port modules includes：
Step 1, TTL serial port modules are initialized；
Step 2, set the I/O pin of single-chip microcomputer to be input, and enable the trailing edge of I/O pin and interrupt；
Step 3, the single-chip microcomputer enters low-power consumption mode, and it is high level, the IO of single-chip microcomputer that the Rx of TTL serial port modules, which receives pin,
Pin is high level；
Step 4, the main website sends bursty data frame, start bit one bit wide of generation of the first character section of bursty data frame
I/O pin of the low level to single-chip microcomputer, the I/O pin of single-chip microcomputer is from high level into low level trailing edge saltus step, and triggering IO draws
Pin is interrupted, and single-chip microcomputer is waken up, into interrupt handling routine；
Step 5, in interrupt handling routine, single-chip microcomputer enables TTL serial port module receive capabilities, starts to receive complete burst number
According to frame.
2. a kind of lossless method for receiving bursty data of TTL serial ports under low-power consumption mode, it is characterised in that：
Including single-chip microcomputer and main website, the single-chip microcomputer is provided with TTL serial port modules, the Tx of the TTL serial port modules send pin with
The Rx pins connection of main website, the Rx of TTL serial port modules receives pin and the Tx pins of main website are connected, and the Gnd of TTL serial port modules draws
The Gnd pins connection of pin and main website；
The lossless method for receiving bursty data of the TTL serial port modules includes：
Step 1, TTL serial port modules are initialized, and wherein Rx pins are set to IO input functions；
Step 2, the trailing edge for enabling Rx pins is interrupted；
Step 3, the single-chip microcomputer enters low-power consumption mode, and it is high level that the Rx of TTL serial port modules, which receives pin,；
Step 4, the main website sends bursty data frame, start bit one bit wide of generation of the first character section of bursty data frame
Rx pin of the low level to TTL serial port modules, the Rx pins of TTL serial port modules are from high level to low level trailing edge saltus step
In, triggering Rx pins are interrupted, and single-chip microcomputer are waken up, into interrupt handling routine；
Step 5, in interrupt handling routine, single-chip microcomputer closes the I/O interrupt function of Rx pins, enables TTL serial port modules and receives work(
Can, start to receive complete bursty data frame.
3. the lossless method for receiving bursty data of TTL serial ports, its feature under low-power consumption mode according to claim 1 or 2
Be, for serial communication baud rate be more than 2400bps in the case of, if interrupt pin wake up single-chip microcomputer arrive enable serial ports receive
Time receives the judgement of pin start bit more than Rx, then receives pin and received first completely according to the bit width simulation of baud rate
Byte, enables serial ports receive capabilities since second byte, receives complete bursty data frame.
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| CN201710451086.3A CN107239422A (en) | 2017-06-15 | 2017-06-15 | A kind of lossless method for receiving bursty data of TTL serial ports under low-power consumption mode |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624915A (en) * | 2020-06-01 | 2020-09-04 | 上海移柯通信技术股份有限公司 | Method for awakening microcontroller by upper computer through serial port |
| CN113660714A (en) * | 2021-07-30 | 2021-11-16 | 烟台东方威思顿电气有限公司 | Low-power consumption awakening method based on specific feature code |
| CN113721958A (en) * | 2021-08-30 | 2021-11-30 | 易事特集团股份有限公司 | Method for upgrading program by sharing port between rectifying side DSP and inverting side DSP |
| US11816060B2 (en) | 2021-03-31 | 2023-11-14 | Nuvoton Technology Corporation | UART interface circuit and UART data capturing method |
| CN117591452A (en) * | 2023-10-13 | 2024-02-23 | 广州沃风科技有限公司 | External wake-up circuit of equipment and external wake-up method thereof |
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| CN113721958A (en) * | 2021-08-30 | 2021-11-30 | 易事特集团股份有限公司 | Method for upgrading program by sharing port between rectifying side DSP and inverting side DSP |
| CN113721958B (en) * | 2021-08-30 | 2024-04-02 | 易事特集团股份有限公司 | Method for upgrading program of common port of rectifying side DSP and inverting side DSP |
| CN117591452A (en) * | 2023-10-13 | 2024-02-23 | 广州沃风科技有限公司 | External wake-up circuit of equipment and external wake-up method thereof |
| CN117591452B (en) * | 2023-10-13 | 2024-06-14 | 广州沃风科技有限公司 | External wake-up circuit of equipment and external wake-up method thereof |
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