CN106569032A - Signal frequency and duty ratio prediction method based on embedded microcontroller - Google Patents
Signal frequency and duty ratio prediction method based on embedded microcontroller Download PDFInfo
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- CN106569032A CN106569032A CN201610905453.8A CN201610905453A CN106569032A CN 106569032 A CN106569032 A CN 106569032A CN 201610905453 A CN201610905453 A CN 201610905453A CN 106569032 A CN106569032 A CN 106569032A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
Abstract
The invention provides a signal frequency and duty ratio prediction method based on an embedded microcontroller, and the method comprises the steps: determining a measurement period of a signal according to the demands of an embedded system; capturing the characteristic values of arrival time of the adjacent rising edges of a detected pulse signal and the characteristic values of arrival time of the falling edges in the same period through employing the capturing interruption enabling and timing interruption enabling of a timer of a central processing unit; comparing the characteristic values of the adjacent rising edges, and obtaining a frequency value of the detected pulse signal; comparing the characteristic values of arrival time of the rising edges and the falling edges, and calculating the duty ratio of the detected pulse signal, wherein the captured characteristic values can be used for making a judgment and controlling one frequency measurement process to be carried out in one frequency measurement period. The method greatly extends the frequency range of the detected pulse signal of the embedded microcontroller, simplifies the frequency measurement mode of the detected pulse signal changing in a wider frequency range, reduces the CPU usage rate of the system, and also can measure the duty ratios of detected pulse signals.
Description
Technical field
The present invention relates to the frequency detecting technology of micro- electric impulse signal, more particularly, to based on embedded microcontroller
Signal frequency detection method.
Background technology
In automatization, today of intelligent deeply development, many signals are related to the measurement of digital waveform, including frequency with account for
Sky ratio.It is a kind of most popular mode to measure the frequency of square wave and dutycycle using embedded microcontroller.Due to signal
Frequency from high to low, scope is extremely wide, and at present, general mode is that high-frequency signal is measured using the mode for counting, and
Low frequency signal is measured using the mode of timing, and according to practical situation measuring method is preset.
During measurement low frequency signal, the rising signals of signal are counted using timer clock, calculate one week of waveform
The quantity of the timer count signal in the phase, it is known that the frequency of intervalometer, you can calculate the cycle T of signal, so as to obtain frequency
Rate value.
When low frequency signal uses chronometry measurement frequency, the general mode with Interruption, if now there is high-frequency signal to connect
Enter, interruption occupies substantial amounts of CPU run time, and system may cannot be jumped out in the interruption of long period, given
The stability of system brings more risk.
During measurement high-frequency signal, several waveforms of continuous counter, then calculate several ripples by the way of counting
The time that shape spends altogether, then the cycle of a complete waveform is calculated, so as to draw frequency.But counting procedure typically compares
Complexity, and the quantity for counting is difficult determination.Because the scope of high-frequency signal it is wider, the highest threshold values and minimum valve of actual measurement
Time of measuring between value is widely different.For example, it is assumed that signal is 1KHz～8KHz, counting is assumed to be 100, then measure 8KHz
The response time needed during signal is 1.25ms, and the response time of 1KHz signal demands is 10ms.Therefore, on stream
The quantity for needing micro-judgment to count.
And the mode using counting method measures high-frequency signal, if high frequency shelves have low frequency signal to access such as 20Hz, need
5S could count full 100 pulses, and the time of response is very long.
Different measuring methods are selected according to the different frequency range of signal, this kind of mode is easy to use, it is reliable convenient, but
In the case of unknown object frequency range, there is certain limitation.Under normal circumstances, default high frequency must with the threshold values of low frequency
Must overlap, when measured signal is near threshold signal, easily produce the mistake of counting method and chronometry switching, and bad boundary
Determine critical frequency.The misconnection or when having more than the signal of measurement range in port, CPU may lose response or
Person is collapsed, and affects the stability of system.Additionally, both approaches are unable to measurement signal dutycycle.
The content of the invention
The present invention provide it is a kind of overcome the problems referred to above or solve the above problems at least in part based on embedded micro-control
The signal frequency detection method of device processed.
According to an aspect of the present invention, there is provided a kind of letter based on embedded microcontroller for adapting to wider frequency range
The detection method of number frequency, it is received by CPU and is processed measured pulse signal, and according to the need of embedded system
The measure the cycle for determining signal is sought, within a frequency measurement cycle, its specific measuring process is as follows：
Enable is interrupted in S1, the Interruption enable for arranging central processing element timer and capture；
S2, when measured pulse signal a complete waveform first rising edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, CPU obtains and records the First Eigenvalue of measured pulse signal；
S3, when measured pulse signal a complete waveform second rising edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, the system timer of CPU records the Second Eigenvalue of measured pulse signal；
S4, confirmation complete an impulsive measurement process；
Close capture and interrupt and enable, the Second Eigenvalue and the First Eigenvalue are compared into computing, calculate by
Survey the frequency values of pulse signal.
Within a frequency measurement cycle, by the cycle of one complete waveform of direct measurement, and control only carries out one
Frequency measuring process, while extension frequency measurement range, simplifies the pulse signal of occurrence frequency change in relative broad range
Frequency measurement mode.
According to another aspect of the present invention, the application proposes a kind of while signal of the detection based on embedded microcontroller
The detection method of frequency and dutycycle, it is received by CPU and is processed measured pulse signal, and according to embedded system
The demand of system determines the measure the cycle of signal, and within a frequency measurement cycle, its specific measuring process is as follows：
Enable is interrupted in SS1, the Interruption enable for arranging central processing element timer and capture；
SS2, when measured pulse signal a complete waveform first rising edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, obtained by CPU and recorded the third feature value of measured pulse signal；
SS3, when measured pulse signal a complete waveform first trailing edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, the fourth feature value of measured pulse signal is recorded by the system timer of CPU；
SS4, when measured pulse signal a complete waveform second rising edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, the fifth feature value of measured pulse signal is recorded by the system timer of CPU；
SS5, confirmation complete an impulsive measurement process；
Close capture and interrupt and enable, the fourth feature value and third feature value are compared into computing, calculate by
Survey the dutyfactor value of pulse signal；
The fifth feature value and third feature value are compared into computing, the frequency of measured pulse signal is calculated
Value.
Within a frequency measurement cycle, by the cycle of one complete waveform of direct measurement, and control only carries out one
Frequency measuring process, while extension frequency measurement range, can also simultaneously measure the dutycycle of measured pulse signal.
The application provide based on embedded microcontroller signal frequency and the detection method of dutycycle, its advantage is such as
Under：
(1) by predeterminated frequency measure the cycle, and using the timestamp of system beat timing, direct measurement measured pulse letter
The cycle of a number complete waveform and be calculated the frequency of signal, greatly expand the frequency range of measurement signal, also, institute
It is related to control program simple；
(2) when measuring high-frequency signal, it is to avoid using complicated counting method control program, and adjust repeatedly by rule of thumb high
The trouble of frequency signal-count value；
(3) low frequency signal and high-frequency signal are measured, using identical metering system, without the need in different measuring mode or difference
Switch between port；
(4) avoid low-speed port misconnection high-speed port from causing the risk of system in case of system halt, it also avoid high-speed port misconnection low
Response speed becomes the problem extremely grown during fast port；
(5) by predeterminated frequency measure the cycle, the measurement process of a secondary frequencies is only carried out within a frequency measurement cycle；
(6) state when by recording or arranging rising edge or trailing edge arrival, judges that measured pulse signal one is complete
The completion statuses or the completion statuses in a frequency measurement cycle of wave period measurement；
(7) while measurement signal frequency, can be with the dutycycle of measurement signal.
Description of the drawings
Fig. 1 is the structural representation in the embodiment of the present invention；
Fig. 2 is the structural representation in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Hereinafter implement
Example is not limited to the scope of the present invention for illustrating the present invention.
Shown in Figure 1, a kind of signal frequency detection method based on embedded microcontroller is connect by CPU
Measured pulse signal, and the default measure the cycle that signal is determined according to the demand of embedded system are received and process, in a frequency
In measure the cycle, specific measurement process is comprised the following steps：
Enable is interrupted in S1, the Interruption enable for arranging central processing element timer and capture；
S2, when measured pulse signal a complete waveform first rising edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, CPU obtains and records the First Eigenvalue of measured pulse signal；
S3, when measured pulse signal a complete waveform second rising edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, the system timer of CPU records the Second Eigenvalue of measured pulse signal；
S4, confirmation complete an impulsive measurement process；
Close capture and interrupt and enable, the Second Eigenvalue and the First Eigenvalue are compared into computing, calculate by
Survey the frequency values of pulse signal.
When starting to measure the frequency of measured pulse signal, enable is interrupted in the capture for arranging CPU,
And after the frequency measurement for completing a complete waveform, close capture and interrupt enable, make only to enter within a frequency measurement cycle
One frequency measuring process of row.Effectively avoid when carrying out frequency measurement using timing or counting mode, due to high frequency and low
The change of frequency signal is changed and causes the phenomenon of system in case of system halt or response time overlength.Both measurement measured pulse signal frequency is reached
Purpose, meanwhile, the computational burden of CPU is significantly reduced again, improve CPU computing effect
Rate.
Additionally, in measurement frequency, being realized by the direct measurement of a complete waveform to measured pulse signal
, therefore, in measurement process, when the frequency of measured pulse signal is widely varied, and need not accordingly convert survey
Amount method, so as to greatly expand the frequency range of measured pulse signal.Pulse of the frequency range in 1Hz～1MHz is believed
Number, without the need for changing any metering system, you can directly measure.
" the First Eigenvalue " in above-mentioned steps S2 is upper for timer value 1, the timestamp 1 of system beat timing and waveform
Rise mark 1.
" Second Eigenvalue " in above-mentioned steps S3 is the timestamp 2 of timer value 2 and system beat timing.
When the rising edge of measured pulse signal is reached, timer capture interrupts enable, triggers external interrupt, now, together
When recording timer value, the timestamp of system beat timing and rise mark, and capture in the comparand register of matching.
Seizure and record to three kinds of eigenvalues, can more accurately determine measured pulse signal rising edge reach when
Carve, meanwhile, also allow for the judgement of the completion statuses to an impulsive measurement and the completion statuses in a frequency measurement cycle.
Concretely comprising the following steps to the confirmation of a frequency measurement cycle completion statuses in above-mentioned steps S4：
S41, when measured pulse signal a complete waveform first rising edge arrive when, be recorded as rise mark 1；
S42, when measured pulse signal a complete waveform second rising edge arrive when, CPU judge
Rising identified whether as 1, if 1, judge that an impulsive measurement process has been completed, and the rising for arranging now is designated 2, enters
Row comparison operation；
S43, when the value of intervalometer rises to the system beat cycle, the Interruption of intervalometer is enabled, and triggers system
Interrupt, the value of intervalometer is cleared, and judge the rising mark that CPU is recorded, if 1, into step S42；If
2, judge that an impulsive measurement process is over, mark will be risen and be set to 0, wait and enter the next frequency measurement cycle, after
Continuous step S1.
By judging the state for rising mark, a completed wave of measured pulse signal both can have accurately been caught
Shape, accurately to measure the frequency of the pulse signal, it is also possible to for judging the completion statuses of an impulsive measurement process, make one
A frequency measuring process is only carried out in the individual frequency measurement cycle.
Meanwhile, when the value of intervalometer rises to the system beat cycle, the value of intervalometer will be cleared, and can remove in time
The record of redundant data, saves the memory space of CPU.
The comparison calculation of above-mentioned steps medium frequency value is：
Calculate difference a of timer value 2 and timer value 1；
Difference b of the timestamp 2 of computing system beat timing and the timestamp 1 of system beat timing；
According to difference a and difference b and, you can draw the cycle of measured pulse signal, and then be calculated measured pulse
The frequency values of signal.
In another embodiment, it is shown in Figure 2, there is provided a kind of signal frequency based on embedded microcontroller and to account for
The detection method of empty ratio, it is received by CPU and is processed measured pulse signal, and according to the demand of embedded system
Determine the measure the cycle of signal, within a frequency measurement cycle, its specific measuring process is as follows：
Enable is interrupted in SS1, the Interruption enable for arranging central processing element timer and capture；
SS2, when measured pulse signal a complete waveform first rising edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, obtained by CPU and recorded the third feature value of measured pulse signal；
SS3, when measured pulse signal a complete waveform first trailing edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, the fourth feature value of measured pulse signal is recorded by the system timer of CPU；
SS4, when measured pulse signal a complete waveform second rising edge arrive when, timer capture interrupt make
Can, external interrupt is triggered, the fifth feature value of measured pulse signal is recorded by the system timer of CPU；
SS5, confirmation complete an impulsive measurement process；
Close capture and interrupt and enable, the fifth feature value and third feature value are compared into computing, calculate by
Survey the frequency values of pulse signal；
The fourth feature value and third feature value are compared into computing, the dutycycle of measured pulse signal is calculated
Value.
By the seizure at moment and state to rising edge and trailing edge arrival, measured pulse signal can be simultaneously obtained
Pulse width and cycle.
When starting to measure the frequency of measured pulse signal, enable is interrupted in the capture for arranging CPU,
And after the frequency measurement for completing a complete waveform, close capture and interrupt enable, make only to enter within a frequency measurement cycle
One frequency measuring process of row.Effectively avoid when carrying out frequency measurement using timing or counting mode, due to high frequency and low
The change of frequency signal is changed and causes the phenomenon of system in case of system halt or response time overlength.Both measurement measured pulse signal frequency is reached
Purpose, meanwhile, the computational burden of CPU is significantly reduced again, improve CPU computing effect
Rate.
Additionally, in measurement frequency, being realized by the direct measurement of a complete waveform to measured pulse signal
, therefore, in measurement process, when the frequency of measured pulse signal is widely varied, and need not accordingly convert survey
Amount method, so as to greatly expand the frequency range of measured pulse signal.It is in the intervalometer running frequency of flush bonding processor
In the case of 100MHz, to frequency range 1Hz～1MHz pulse signal, without the need for changing any metering system, you can
Directly measure.The precision of frequency measurement is within 2% in the case of the most limit.If the intervalometer fortune of flush bonding processor
Line frequency faster, can measure broader scope.
" third feature value " in above-mentioned steps SS2 is timer value 3, the timestamp 3 of system beat timing and waveform
Rise mark 1.
" fourth feature value " in above-mentioned steps SS3 is timer value 4, the timestamp 4 of system beat timing and waveform
Decline mark 1.
" fifth feature value " in above-mentioned steps SS4 is the timestamp 5 of timer value 5 and system beat timing.
When the rising edge or trailing edge of measured pulse signal are reached, timer capture interrupts enable, triggers external interrupt,
Now, while recording timer value, the timestamp of system beat timing and rising or falling mark, can more accurately determine
The moment that measured pulse signal rising edge or trailing edge are reached, meanwhile, also allow for completion statuses and frequency to an impulsive measurement
The judgement of the completion statuses of rate measure the cycle.
Concretely comprising the following steps to the confirmation of a frequency measurement cycle completion statuses in above-mentioned steps SS5：
SS51, when measured pulse signal a complete waveform first rising edge arrive when, be recorded as rise mark
1；
SS52, when measured pulse signal a complete waveform first trailing edge arrive when, be recorded as decline mark
1；
SS53, when measured pulse signal a complete waveform second rising edge arrive when, CPU is sentenced
The disconnected mark or decline of rising identified whether as 1, if 1, judge that an impulsive measurement process has been completed, and arrange now it is upper
Rise and be designated 2, be compared computing；
SS54, when the value of intervalometer rises to the system beat cycle, it is into system break, the value of intervalometer is clear
Zero, and judge the rising mark that CPU is recorded, if 1, into step SS53；If 2, judge an impulsive measurement
Process is over, and will rise mark and is set to 0, waits the measure the cycle for entering next frequency and dutycycle, return to step
SS1。
Judged by the state to rising or falling mark, both can accurately catch the pulse of measured pulse signal
Width and a complete waveform, with the frequency for accurately measuring the now pulse signal, it is also possible to for judging an impulsive measurement
The completion statuses of process.
Meanwhile, when the value of intervalometer rises to the system beat cycle, the value of intervalometer will be cleared, and can remove in time
The record of redundant data, saves the memory space of CPU.
The comparison operation mode of above-mentioned steps medium frequency value is：
Calculate difference c of timer value 5 and timer value 3；
Difference d of the timestamp 5 of computing system beat timing and the timestamp 3 of system beat timing；
According to difference c and difference d and, you can draw the cycle A of measured pulse signal, and then be calculated measured pulse
The frequency values B of signal.
The comparison operation mode of dutyfactor value is in above-mentioned steps：
Calculate the difference e of timer value 4 and timer value 3；
Difference f of the timestamp 4 of computing system beat timing and the timestamp 3 of system beat timing；
By difference e and the sum of difference f, pulse width C of measured pulse signal is obtained；
By pulse width C and cycle A, the dutyfactor value of measured pulse signal is calculated.
The detection method of the signal frequency based on embedded microcontroller that the application is provided, according to the need of embedded system
The measure the cycle for determining signal is sought, while interrupt using the capture of intervalometer enabling and Interruption enable, measured pulse is caught
The eigenvalue when adjacent rising edges of signal are reached, and the eigenvalue of adjacent rising edges is compared into computing, obtain tested arteries and veins
Rush the frequency values of signal.
Also, the eigenvalue that captures of application, the completion statuses of determination frequency measurement and frequency measurement cycle complete shape
State, so as to control within a frequency measurement cycle, to complete a frequency measuring process, with regard to no longer carrying out frequency measurement, until
Into the next frequency measurement cycle.
The signal frequency based on embedded microcontroller and the detection method of dutycycle that the application is provided, according to embedded
The demand of system determines the measure the cycle of signal, while interrupt using the capture of intervalometer enabling and Interruption enable, catches
The eigenvalue when adjacent rising edges of measured pulse signal are reached and the eigenvalue in the same cycle during trailing edge arrival, and
The eigenvalue of adjacent rising edges is compared into computing, the frequency values of measured pulse signal are obtained, trailing edge is arrived with rising edge
Up to when eigenvalue be compared, so as to be calculated the dutycycle of measured pulse signal.
Also, the eigenvalue that captures of application, the completion statuses of determination frequency measurement and frequency measurement cycle complete shape
State, so as to control within a frequency measurement cycle, to complete a frequency measuring process, with regard to no longer carrying out frequency measurement, until
Into the next frequency measurement cycle.
Finally, the present processes are only preferably embodiment, are not intended to limit protection scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of signal frequency detection method based on embedded microcontroller, it is characterised in that received by CPU
And measured pulse signal is processed, and the measure the cycle of signal is determined according to the demand of embedded system, a frequency measurement week
In phase, its specific measuring process is as follows：
Enable is interrupted in S1, the Interruption enable for arranging central processing element timer and capture；
S2, when measured pulse signal a complete waveform first rising edge arrive when, timer capture interrupt enable, touch
External interrupt is sent out, CPU obtains and record the First Eigenvalue of measured pulse signal；
S3, when measured pulse signal a complete waveform second rising edge arrive when, timer capture interrupt enable, touch
External interrupt is sent out, the system timer of CPU records the Second Eigenvalue of measured pulse signal；
S4, confirmation complete an impulsive measurement process；
Close capture and interrupt enable, the Second Eigenvalue and the First Eigenvalue are compared into computing, calculate tested arteries and veins
Rush the frequency values of signal.
2. a kind of signal frequency detection method based on embedded microcontroller as claimed in claim 1, it is characterised in that：Step S2
Described in " the First Eigenvalue " for timer value 1, the timestamp 1 of system beat timing and waveform rising mark 1.
3. a kind of signal frequency detection method based on embedded microcontroller as claimed in claim 1, it is characterised in that：Institute in S3
" Second Eigenvalue " stated is the timestamp 2 of timer value 2 and system beat timing.
4. a kind of signal frequency detection method based on embedded microcontroller as claimed in claim 1, it is characterised in that：Step S4
In " confirmation " concretely comprise the following steps：
S41, when measured pulse signal a complete waveform first rising edge arrive when, be recorded as rise mark 1；
S42, when measured pulse signal a complete waveform second rising edge arrive when, CPU judge rise
Identify whether as 1, if 1, judge that an impulsive measurement process has been completed, and the rising for arranging now is designated 2, is compared
Compared with computing；
S43, when the value of intervalometer rises to the system beat cycle, into system break, the value of intervalometer is reset, and sentence
The rising mark of disconnected CPU record,
If 1, into step S42；
If 2, judge that an impulsive measurement process is over, mark will be risen and be set to 0, wait and enter next frequency measurement
Cycle, return to step S1.
5. a kind of detection method of the signal frequency and dutycycle based on embedded microcontroller, is received simultaneously by CPU
Measured pulse signal is processed, and the measure the cycle of signal is determined according to the demand of embedded system, a frequency measurement cycle
Interior, its specific measuring process is as follows：
Enable is interrupted in SS1, the Interruption enable for arranging central processing element timer and capture；
SS2, when measured pulse signal a complete waveform first rising edge arrive when, timer capture interrupt enable,
Triggering external interrupt, is obtained by CPU and is recorded the third feature value of measured pulse signal；
SS3, when measured pulse signal a complete waveform first trailing edge arrive when, timer capture interrupt enable,
Triggering external interrupt, by the system timer of CPU the fourth feature value of measured pulse signal is recorded；
SS4, when measured pulse signal a complete waveform second rising edge arrive when, timer capture interrupt enable,
Triggering external interrupt, by the system timer of CPU the fifth feature value of measured pulse signal is recorded；
SS5, confirmation complete an impulsive measurement process；
Close capture and interrupt enable, the fifth feature value and third feature value are compared into computing, calculate tested arteries and veins
Rush the frequency values of signal；
The fourth feature value and third feature value are compared into computing, the dutyfactor value of measured pulse signal is calculated.
6. a kind of detection method of the signal frequency and dutycycle based on embedded microcontroller as claimed in claim 5, its feature
It is：" third feature value " in step SS2 is timer value 3, the timestamp 3 of system beat timing and rises mark 1.
7. a kind of detection method of the signal frequency and dutycycle based on embedded microcontroller as claimed in claim 5, its feature
It is：" fourth feature value " in step SS3 is timer value 4, the timestamp 4 of system beat timing and declines mark 1.
8. a kind of detection method of the signal frequency and dutycycle based on embedded microcontroller as claimed in claim 5, its feature
It is：" fifth feature value " in step SS4 is the timestamp 5 of timer value 5 and system beat timing.
9. a kind of detection method of the signal frequency and dutycycle based on embedded microcontroller as claimed in claim 5, its feature
It is that " confirmation " comprises the following steps that in step SS5：
SS51, when measured pulse signal a complete waveform first rising edge arrive when, be recorded as rise mark 1；
SS52, when measured pulse signal a complete waveform first trailing edge arrive when, be recorded as decline mark 1；
SS53, when measured pulse signal a complete waveform second rising edge arrive when, CPU judge on
Rise mark or decline and identify whether as 1, if 1, judge that an impulsive measurement process has been completed, and the upper raising of indices now is set
Know for 2, be compared computing；
SS54, when the value of intervalometer rises to the system beat cycle, into system break, the value of intervalometer is reset, and
Judge the rising mark that CPU is recorded,
If 1, into step SS53；
If 2, judge that an impulsive measurement process is over, mark will be risen and be set to 0, wait and enter next frequency and account for
Sky is than measure the cycle, return to step SS1.
10. a kind of signal frequency detection method based on embedded microcontroller as claimed in claim 5, it is characterised in that：It is described
Intervalometer is the phaselocked loop voltage or other systems intervalometer of CPU.
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Effective date of registration: 20190530 Address after: 410100 Xingsha Industrial Base (Changlong Street), Changsha Economic and Technological Development Zone, Changsha City, Hunan Province, No. 1259, Liangtang East Road Patentee after: Kaiyuan Instrument Co., Ltd., Changsha Address before: 410100 No. 172 Kaiyuan Road, Changsha economic and Technological Development Zone, Hunan Patentee before: Changsha Kaiyuan Instruments Co., Ltd. |