WO2018165923A1

WO2018165923A1 - Method and device for internal oscillation calibration for mpos-based mcu

Info

Publication number: WO2018165923A1
Application number: PCT/CN2017/076814
Authority: WO
Inventors: 彭学斌
Original assignee: 深圳大趋智能科技有限公司
Priority date: 2017-03-15
Filing date: 2017-03-15
Publication date: 2018-09-20
Also published as: CN107690633B; CN107690633A

Abstract

Disclosed are a method and device for internal oscillation calibration for an mPOS-based MCU. The method comprises the steps of: acquiring a current working baud rate measured value of the MCU; converting into a current estimated working frequency of the MCU on the basis of the current working baud rate measured value of the MCU; adjusting the frequency of the MCU on the basis of the current estimated working frequency of the MCU, and adjusting to a standard working frequency. Effectively mitigated is the problem of communication error or failure brought forth by internal oscillation frequency deviation and inaccurate timing.

Description

MCU internal oscillation calibration method and device based on mPOS

[0001] The present invention relates to an internal oscillator calibration method for an MCU, and more particularly to an mPOS-based MCU internal oscillation calibration method and apparatus.

Background technique

[0002] As a mobile sales terminal, mPOS (Mobile Point Of Sale) is connected to devices such as mobile phones and tablets through Bluetooth to realize secure payment. As the competition in the payment industry tends to heat up, the cost pressure on end products is increasing. In order to reduce the cost, the external crystal is removed, and the internal oscillation is used. Due to the individual differences of the chip, the deviation of internal oscillation is more. For example, we use the national technology Z32HUA security chip, the user manual has a nominal ±10%, which seriously affects the serial communication and Precisely set.

[0003] In mass production, some machines fail to work properly due to internal fluctuations, such as Bluetooth module communication failure and buzzer sound abnormality.

technical problem

[0004] The main object of the present invention is to provide an mCU-based MCU internal oscillation calibration method to solve the above-mentioned problem that the Bluetooth module fails to communicate due to the deviation of the internal oscillation.

Problem solution

Technical solution

[0005] The present invention provides an mPOS-based MCU internal oscillation calibration method, including the steps:

[0006] obtaining the current working baud rate measurement value of the MCU;

[0007] according to the current working baud rate measurement value of the MCU, the current measured operating frequency of the MCU is converted; [0008] the MCU is frequency-adjusted according to the current measured operating frequency of the MCU, and adjusted to the standard working frequency.

[0009] Further, in the above mPOS-based MCU internal oscillation calibration method, the above-mentioned conversion working frequency conversion formula includes:

[0010] f = (f BPR _curr )/BPR

[0011] wherein: is the current working frequency of the MCU, f _standard is the standard operating frequency of the above MCU BPR _cw is the current MCU baud rate measurement value, and BPR _standard is the current MCU baud rate standard value.

[0012] Further, the mPOS-based MCU internal oscillation calibration method further includes, after the step of obtaining the current working baud rate measurement value of the MCU, the step of testing the MCU current working baud rate maximum and minimum values. ;

[0013] The above steps for testing the maximum and minimum operating baud rates of the current MCU include:

[0014] Sl l, detecting whether the current value of the baud rate of the MCU is less than a preset maximum boundary value;

[0015] S12. If the current value is less than a preset maximum boundary value, send a test signal to the Bluetooth chip, and check whether the communication is successful; otherwise, perform the step of acquiring the current working baud rate measurement value of the MCU.

[0016] S13, if the communication is successful, the communication flag is set to 1, otherwise, step S18;

[0017] S14. Detect whether the current value is less than a minimum value;

[0018] S15. If the current value is less than the minimum value, update the current value to a minimum value and save, otherwise

, performing step S16;

[0019] S16: detecting whether the current value is greater than a maximum value;

[0020] S17. If the current value is greater than the maximum value, update the current value to a maximum value and save, otherwise

, performing step S18;

[0021] S18, adding the above current value to 1, and returning to perform the above step S11;

[0022] Repeating the above steps S11-S18 until the current value is not less than the maximum boundary value, and the maximum value and the minimum value stored in the above-mentioned steps are tested in the above steps to test the current working baud rate and the minimum value of the MCU. Maximum and minimum values.

[0023] Further, the step of the mPOS-based MCU internal oscillation calibration method, the step of acquiring the current working baud rate measurement value of the MCU, further includes:

[0024] detecting whether the communication flag is 1;

[0025] When the communication flag is 1吋, the average value of the maximum value and the minimum value of the baud rate is taken as the measured value;

[0026] When the communication flag is not 1吋, the default value of the baud rate is taken as the measured value.

[0027] Further, the above mPOS-based MCU internal oscillation calibration method, in the above test, the current M

Before the CU's working baud rate maximum and minimum steps, it also includes: [0028] The current value, the maximum value, the minimum value, the default value, and the maximum boundary value of the above-described baud rate of the initialization port are preset.

[0029] The present invention provides an mPOS-based MCU internal oscillation calibration apparatus, including:

[0030] an obtaining module, which acquires a current working baud rate measurement value of the MCU;

[0031] a conversion module, configured to convert the current measured working frequency of the MCU according to the current working baud rate measurement value of the MCU;

[0032] The adjustment module is configured to perform frequency adjustment on the MCU according to the current measured working frequency of the MCU, and adjust to a standard working frequency.

[0033] Further, in the above mPOS-based MCU internal oscillation calibration device, the conversion formula of the above-mentioned measurement operating frequency converted by the conversion module includes:

[0034] f = (f BPR _curr )/BPR

[0035] wherein: is the current working frequency of the MCU, f _standard is the standard operating frequency of the above MCU

BPR is the current MCU baud rate measurement value, and BPR _standard is the current MCU baud rate standard value.

[0036] Further, the mPOS-based MCU internal oscillation calibration device further includes a test module, and the test module includes:

[0038] a first determining submodule, configured to detect whether a current value of a baud rate of the MCU is less than a preset maximum boundary value;

[0039] a second determining submodule, configured to send a test signal to the Bluetooth chip, to detect whether the communication is successful;

[0040] a flag sub-module, configured to set the communication flag to 1;

[0041] a third determining submodule, configured to detect whether the current value is less than a minimum value;

[0042] a first setting submodule, configured to update the current value to a minimum value and save;

[0043] a fourth determining submodule, configured to detect whether the current value is greater than a maximum value;

[0044] a second setting submodule, configured to update the current value to a maximum value and save;

[0045] a feedback submodule, configured to add 1 to the current value, and run the first determining submodule;

[0046] wherein, when the first determining sub-module determines that the result is 吋, the second determining sub-module is executed; and when the second determining sub-module determines that the result is 吋, the marking sub-module and the third determining sub-module are executed. When the third judgment sub-module determines that the result is yes, the first setting sub-module and the fourth judgment are executed. The sub-module,; when the fourth judging sub-module determines that the result is 吋, the second setting sub-module is operated

And running the above feedback sub-module;

[0047] when the first determining sub-module determines that the result is negative, running the acquiring module;

[0048] when the second determining sub-module determines that the result is no, the feedback sub-module is executed;

[0049] when the third determining sub-module determines that the result is negative, running the fourth determining sub-module;

[0050] when the fourth determining sub-module determines that the result is negative, running the feedback sub-module;

[0051] The above modules are repeatedly operated until the current value is not less than the maximum boundary value, and the maximum value and the minimum value stored by the above are the maximum and minimum values to be tested by the above test module.

[0052] Further, the mPOS-based MCU internal oscillation calibration device, the acquiring module further includes

[0053] a fifth determining submodule, configured to detect whether the communication flag is 1;

[0054] The first measuring submodule is configured to: when the communication flag is 1吋, take the average value of the maximum value and the minimum value of the baud rate as the measured value;

[0055] The second measuring submodule is configured to: when the communication flag is not 1吋, the default value of the baud rate is the measured value.

[0056] Further, the mPOS-based MCU internal oscillation calibration device further includes:

[0057] a preset module, configured to preset a current value, a maximum value, a minimum value, a default value, and a maximum boundary value of the baud rate of the initialization port.

Advantageous effects of the invention

Beneficial effect

[0058] The mPOS-based MCU internal oscillation calibration method and device of the present invention effectively reduces the communication anomaly or failure caused by the internal oscillation frequency deviation and the inaccurate problem by testing and adjusting the operating frequency of the MCU. It greatly reduces the raw material loss of the producer, improves the utilization rate of raw materials, reduces the cost, and is more environmentally friendly.

Brief description of the drawing

DRAWINGS

1 is a schematic flowchart of a mPOS-based MCU internal oscillation calibration method according to an embodiment of the present invention; [0060] FIG. 2 is a flow chart of an mPOS-based MCU internal oscillation calibration method according to an embodiment of the present invention; [0061] 3 is a schematic flowchart of a mPOS-based MCU internal oscillation calibration method according to an embodiment of the present invention; 4 is a schematic block diagram showing a structure of an internal oscillator oscillating calibration method based on mPOS according to an embodiment of the present invention;

5 is a schematic block diagram showing the structure of an internal oscillator oscillating calibration device based on mPOS according to an embodiment of the present invention;

6 is a block diagram showing the structure of an MCU internal oscillation calibration apparatus based on mPOS according to an embodiment of the present invention. [0065] FIG. 7 is a block diagram showing the structure of an MCU internal oscillation calibration apparatus according to an embodiment of the present invention [0066] FIG. 8 is a schematic block diagram showing the structure of an internal oscillator oscillating calibration apparatus based on mPOS according to an embodiment of the present invention.

[0067] 10, test module; 11, the first judgment sub-module; 12, the second judgment sub-module; 13, the flag sub-module; 14, the third judgment sub-module; 15, the feedback sub-module; 16, the first setting Sub-module; 17, fourth judging sub-module; 1 ₈ , second setting sub-module; 20, acquiring module; 21, fifth judging sub-module; 22, first measuring sub-module; 23, second measuring sub-module; 30, conversion module; 40, adjustment module.

[0068] The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

BEST MODE FOR CARRYING OUT THE INVENTION

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of them. Example. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In addition, the descriptions relating to "first", "second" and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. . Thus, features defining "first" and "second" may include at least one of the features, either explicitly or implicitly. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.

Referring to FIG. 1, in the embodiment of the present invention, the present invention provides an MCU internal oscillation calibration method based on mPOS, including the steps of: S20: acquiring a current working baud rate measurement value of the MCU; S30, according to the foregoing MCU. The current working baud rate measurement value is converted into the current measured working frequency of the MCU; S40, The MCU is frequency-adjusted according to the current measured operating frequency of the MCU and adjusted to the standard operating frequency.

[0072] In step S20, the conversion of the test value is performed according to the maximum and minimum values of the baud rate obtained in the above step S10, wherein the method preferably takes the average of the maximum and minimum values of the baud rate. Value as a test value;

[0073] Step S30, the working baud rate test value of the current MCU converted according to the above step S20, combined with the standard operating frequency and the working baud rate standard value of the MCU;

[0074] Step S40, after performing the calculating the operating frequency of the MCU in the above step S30, performing frequency adjustment on the MCU according to the measured frequency, increasing or decreasing the operating frequency of the MCU, and adjusting the operating frequency to the standard work. Frequency value.

[0075] In this embodiment, the above mPOS-based MCU internal oscillation calibration method, the above-mentioned conversion working frequency conversion formula includes:

f curr = (f standardXBPR _CU rr)/BPR standard

[0077] wherein: the current operating frequency of the MCU, f _standard is the standard operating frequency of the MCU

[0078] The above formula: f _eim = (f _standard xBPR _euiI ) / BPR standard, derived from the formula f curr BPR curr - f standarc BPR standard.

[0079] Referring to FIG. 2, in the embodiment, the mPOS-based MCU internal oscillation calibration method further includes the step S10, testing the MCU before the obtaining the current working baud rate measurement value of the MCU in the foregoing step S20. The current working baud rate and the minimum value; the above S10, testing the current MCU operating baud rate maximum and minimum steps, further comprising: Sl l, detecting whether the current value of the MCU baud rate is less than a preset a maximum boundary value; S12. If the current value is less than a preset maximum boundary value, send a test signal to the Bluetooth chip to detect whether the communication is successful; otherwise, perform the acquiring the current working baud rate measurement value of the MCU. Step: S13, if the communication is successful, the communication flag is set to 1, otherwise, step S18 is performed; S14, detecting whether the current value is less than a minimum value; S15, if the current value is less than a minimum value, The current value is updated to the minimum value and saved, otherwise, step S16 is performed; S16, detecting whether the current value is greater than the maximum value; S17, if the current value is greater than the maximum value, The current value is more New is the maximum value and saved, otherwise, step S18 is performed; S18, the current value is incremented by 1, and the step S11 is performed; the above steps S11-S18 are repeated until the current value is not less than the maximum boundary value. The stored maximum and minimum values are tested for the above steps to test the maximum and minimum values to be tested in the current working baud rate and minimum value of the MCU.

[0080] The above-mentioned step S10, the maximum and minimum working baud rates of the MCU are calculated according to the signal of the current MCU and the working environment, wherein the MCU detected by the present invention is preferably the Z32HUA security of the National Technology Co., Ltd. Chip

[0081] Step S1 l, detecting that the current value of the current baud rate is compared with a maximum boundary value, where, before the comparing step, the current value and the minimum value of the preset baud rate are generally included. And maximum value;

[0082] Step S12, when the result of step S11 is that the current value of the baud rate is less than the maximum boundary value, the MCU sends a test signal to the Bluetooth chip for communication attempt, and detects whether the Bluetooth chip has a feedback signal. ;

[0083] According to the above step S13, according to the detection result of the above step S12, when the Bluetooth chip has a feedback signal to the MCU, the communication flag of the MCU is set to 1, wherein the MCU will perform the above step S10. The communication flag contained in the message is cleared to 0;

[0084] Step S14, comparing the current value and the minimum value of the baud rate of the MCU whose communication flag is set to 1 in the above step S13, detecting whether the current value is less than a minimum value;

[0085] Step S15, when the result of the above step S14 is that the current value is less than the minimum value, the current value is set to a new minimum value;

[0086] If the current value is set to a new minimum value in the above step S15, or when the determination result in the above step S14 is that the current value is not less than the minimum value, it is detected whether the current value is greater than the maximum value. Value

[0087] If the result of the above step S16 is that the current value is greater than the maximum value 如, the current value is set to a maximum value;

[0088] If the result of the determination in the above step S13 is that the communication is unsuccessful, or the current value is set to the maximum value in the above step S17, or the determination result in the above step S16 is the above, If the current value is not greater than the maximum value, the above current value of the MCU whose communication is unsuccessful is incremented by 1, and returned. Step S1 l compares the current value after adding 1 with the maximum boundary value to detect whether it is less than the maximum boundary value.

[0089] Referring to FIG. 3, in the embodiment, the mPOS-based MCU internal oscillation calibration method, the step of acquiring the current working baud rate measurement value of the MCU, further includes: S21: detecting whether the communication flag is 1 ; S22. When the communication flag is 1吋, take the average value of the maximum and minimum values of the baud rate as the measured value; S23. When the communication flag is not 1吋, the default value of the baud rate is taken as the measured value.

[0090] Step S21, detecting the communication flag of the MCU, and detecting whether the communication flag is 1, wherein the communication flag in the MCU generally includes two types, one is successful for communication detection, and the baud rate is The current value is not less than the maximum boundary value, the communication flag is 1; the other is that the communication detection is unsuccessful, or the current value of the baud rate is less than the maximum boundary value, and the communication flag is 0;

[0091] If the result of the determination in the above step S21 is that the communication flag is 1吋, the average value of the maximum value and the minimum value of the baud rate of the MCU is taken as the measured value;

[0092] As in the above step S23, when the result of the determination in the above step S21 is that the communication flag is not 1吋, the default value of the baud rate is taken as the measured value.

In the embodiment, the mPOS-based MCU internal oscillation calibration method includes: S9, pre-set initialization, before the step S10, testing the maximum and minimum operating baud rates of the current MCU. The current value, maximum value, minimum value, default value, and maximum boundary value of the baud rate.

[0094] As in step S9 above, before the execution of the maximum and minimum values of the working baud rate of the current MCU in the above step S10, the current value, the maximum value, and the minimum value of the set of the above-mentioned baud rates are preset to the system. The value, the default value, and the maximum boundary value, the system tests the MCU according to the current value, the maximum value, the minimum value, the default value, and the maximum boundary value of the above baud rate to obtain the actual maximum baud rate of the MCU. And minimum.

[0095] Referring to FIG. 4, in an embodiment, the mPOS-based MCU internal oscillation calibration method is implemented according to the following steps: S9. Presetting the current value, maximum value, minimum value, and default value of the baud rate. And the maximum boundary value; S10, testing the maximum and minimum working baud rate of the current MCU; the above step S10 performing the process includes performing the following sub-steps: Sl l, detecting whether the current value of the baud rate of the MCU is less than the pre- Setting a maximum boundary value; S12, if the current value is less than a preset maximum boundary value, sending a test signal to the Bluetooth chip to detect whether the communication is successful; otherwise, performing the acquiring the current MCU Step of calculating the working baud rate; S13, if the communication is successful, setting the communication flag to 1, otherwise, performing step S18; S14, detecting whether the current value is less than the minimum value; S15, if the current value is less than If the current value is greater than the maximum value, The value is updated to the maximum value and saved, otherwise, step S18 is performed; S18, the current value is incremented by 1, and the step S11 is performed; the above steps S11-S18 are repeated until the current value is not less than the maximum boundary value, The maximum value and the minimum value are stored, and the maximum and minimum values to be tested in the current working baud rate and the minimum value of the MCU are tested for the above steps; S20. Obtaining the current working baud rate of the MCU. The above step S20 execution process includes the following sub-steps: S21, detecting whether the communication flag is 1; S22, when the communication flag is 1吋, taking the maximum value of the baud rate and the most The average value is used as the measured value; S23. When the communication flag is not 1吋, the default value of the baud rate is taken as the measured value; S30, the measured working frequency of the current MCU is converted; S40, the frequency is calculated for the MCU according to the above measured frequency Adjust and adjust to the standard operating frequency.

5, the present invention provides an MCU internal oscillation calibration apparatus based on mPOS, comprising: an acquisition module 20, configured to acquire a current working baud rate measurement value of the MCU; and a conversion module 30, configured to The current working baud rate of the MCU is calculated, and the current measured operating frequency of the MCU is converted. The adjusting module 40 is configured to adjust the frequency of the MCU according to the current measured working frequency of the MCU, and adjust to the standard operating frequency.

[0097] The obtaining module 20 is generally configured to perform conversion of the test value according to the maximum value and the minimum value of the baud rate obtained by the test module 10, wherein the method preferably takes the maximum baud rate. And the average of the minimum values as test values;

[0098] The above-mentioned scaling module 30 is generally used to combine the working port rate test value of the current MCU converted by the obtaining module 20, and the standard operating frequency and the working baud rate standard value of the MCU;

[0099] The adjustment module 40 is generally configured to calculate the operating frequency of the MCU according to the conversion module 30, perform frequency adjustment on the MCU according to the measurement frequency, increase or decrease the operating frequency of the MCU, and adjust the operating frequency to The above standard operating frequency value.

[0100] In the embodiment, the mPOS-based MCU internal oscillation calibration device, the conversion formula of the above-mentioned measurement operating frequency converted by the conversion module 20 includes: f = (f standardXBPR _CUIT )/BPR _stan dard

[0102] wherein: is the measured working frequency of the current MCU, f _standard is the standard operating frequency of the above MCU

[0103] The above formula: f _eim = (f _standard xBPR _euiI ) / BPR standard, derived from the formula f curr / BPR = f standard / BPR standard.

[0104] Referring to FIG. 6, in the embodiment, the mPOS-based MCU internal oscillation calibration device, the test module further includes a sub-module: further comprising a test module 10, the test module 10 includes: a first determination sub-module 11 And a method for detecting whether the current value of the baud rate is less than a preset maximum boundary value; the second determining sub-module 12, configured to send a test signal to the Bluetooth chip, to detect whether the communication is successful; and a flag sub-module 13 configured to use the communication flag The third determining sub-module 14 is configured to detect whether the current value is less than a minimum value; the first setting sub-module 15 is configured to update the current value to a minimum value and save the fourth determining sub-module 16, For detecting whether the current value is greater than the maximum value; the second setting sub-module 17 is configured to update the current value to a maximum value and save; the feedback sub-module 18 is configured to add 1 to the current value, and run the first a judging sub-module; wherein, when the first judging sub-module 11 determines that the result is yes, the second judging sub-module 12 is operated; The break module 12 determines that the result is 吋, and runs the above-mentioned flag sub-module 13 and the third judging sub-module 14; when the third judging sub-module 14 determines that the result is 吋, the first setting sub-module 15 and the fourth are operated. Judging sub-module 16,; when the fourth judging sub-module 16 determines that the result is 吋, running the second setting sub-module 17, and running the feedback sub-module 18; when the first judging sub-module 11 determines that the result is no运行, running the above obtaining module; when the second determining sub-module 12 determines that the result is no, the feedback sub-module 18 is operated; when the third determining sub-module 14 determines that the result is no, the fourth determining sub-module 16 is operated. When the fourth judgment sub-module 16 determines that the result is negative, the feedback sub-module 18 is operated; the above modules are repeatedly operated until the current value is not less than the maximum boundary value, and the maximum value and the minimum value stored in the above-mentioned The maximum and minimum values to be tested by the test module.

[0105] The test module 10 is generally configured to calculate a maximum and a minimum working baud rate of the MCU according to a signal and a working environment of the current MCU, where the MCU detected by the present invention is preferably a National Technology Co., Ltd. Z32HUA security chip; [0106] The first determining sub-module 11 is generally configured to detect that the current value of the current baud rate is compared with a maximum boundary value, where the first determining sub-module 11 is generally pre-previously before the comparing step. Set the current, minimum and maximum values of the baud rate;

[0107] The second determining sub-module 12 is generally configured to: when the first determining sub-module 11 determines that the current value of the baud rate is less than the maximum boundary value, the MCU sends a test signal to the Bluetooth chip to perform a communication attempt, and Detecting whether the above Bluetooth chip has a feedback signal;

[0108] The flag sub-module 13 is generally configured to: according to the detection result of the second determining sub-module 12, when the Bluetooth chip has a feedback signal to the MCU, setting the communication flag of the MCU to 1, wherein the MCU is Clearing the communication flag contained in the test module 10 before performing the above test module 10;

[0109] The third determining sub-module 14 is generally configured to compare the current value and the minimum value of the baud rate of the MCU whose communication flag is set to 1 in the flag sub-module 13 to detect whether the current value is less than a minimum value. ;

The first setting sub-module 15 is generally configured to set the current value to a new minimum value when the result determined by the third determining sub-module 14 is that the current value is less than a minimum value;

[0111] The fourth determining sub-module 16 is generally configured to: when the first setting sub-module 15 sets the current value to a new minimum value, or when the determination result of the third determining sub-module 14 is the above If the current value is not less than the minimum value, detecting whether the current value is greater than the maximum value;

[0112] The second setting sub-module 17 is generally configured to set the current value to a maximum value when the determination result of the fourth determining sub-module 16 is that the current value is greater than a maximum value;

[0113] The feedback sub-module 18 is generally used when the determination result in the flag sub-module 13 is that the communication is unsuccessful, or after the second setting sub-module 17 sets the current value to the maximum value, or When the determination result in the fourth judging sub-module 16 is that the current value is not greater than the maximum value, the current value of the unsuccessful MCU is incremented by one, and the first judging sub-module 11 is returned, and the first judging sub-module 11 is added. The above current value is compared with the maximum boundary value to detect whether it is less than the maximum boundary value.

[0114] Referring to FIG. 7, in the embodiment, the mPOS-based MCU internal oscillation calibration apparatus, the acquiring module further includes: a fifth determining sub-module 21, configured to detect whether the communication flag is 1; The module 22 is configured to: when the communication flag is 1吋, take the average value of the maximum value and the minimum value of the baud rate as the measured value; the second measuring sub-module 23 is configured to: when the communication flag is not 1吋, take the baud rate The default value is the measured value [0115] The fifth determining sub-module 21 is generally configured to detect the communication flag of the MCU, and detect whether the communication flag is 1, wherein the communication flag in the MCU generally includes two types, and one is successful for communication detection. And, the current value of the baud rate is not less than the maximum boundary value, the communication flag is 1; the other is that the communication detection is unsuccessful, or the current value of the baud rate is less than the maximum boundary value, and the communication flag is 0;

[0116] The first measurement sub-module 22 is generally configured to: when the determination result in the fifth determining sub-module 21 is that the communication flag is 1吋, take the average value of the maximum value and the minimum value of the baud rate of the MCU as Measured value

[0117] The second measurement sub-module 23 is generally used to determine that the communication flag is not 1吋 when the determination result in the fifth determination sub-module 21 is set, and the default value of the baud rate is the measured value.

[0118] In this embodiment, the mPOS-based MCU internal oscillation calibration device further includes:

[0119] The preset module 9 is configured to preset the current value, the maximum value, the minimum value, the default value, and the maximum boundary value of the above-mentioned baud rate of the initialization port.

[0120] The preset module 9 is generally configured to run a test maximum value and a minimum value on the test module 10, and preset a current set of values, a maximum value, a minimum value, and a default value of the baud rate of the initialization system. The value and the maximum boundary value, the system tests the MCU according to the current value, the maximum value, the minimum value, the default value and the maximum boundary value of the set baud rate to obtain the actual maximum baud rate and minimum value of the MCU.

[0121] Referring to FIG. 8, in a specific embodiment, the preset module 9 presets a current value, a maximum value, a minimum value, a default value, and a maximum boundary value of the baud rate. The test module 10 tests the current MCU. The maximum value and the minimum value of the working baud rate are performed by the following sub-modules during the execution of the test module 10: The first determining sub-module 11 is configured to detect whether the current value of the baud rate is less than a preset maximum a second determination sub-module 12, configured to send a test signal to the Bluetooth chip to detect whether the communication is successful; a flag sub-module 13 configured to set the communication flag to 1; and a third determination sub-module 14 configured to detect the current Whether the value is less than the minimum value; the first setting sub-module 15 is configured to update the current value to a minimum value and save; the fourth determining sub-module 16 is configured to detect whether the current value is greater than a maximum value; a module 17, configured to update the current value to a maximum value and save; the feedback sub-module 18 is configured to add 1 to the current value, and run the first determining sub-module; , When said first determination sub-module 11 as the determination result is inches, the second operation determination sub-module 12; when said second judging sub-module 12 determines the junction If yes, the above-mentioned flag sub-module 13 and the third judging sub-module 14 are operated; when the third judging sub-module 14 determines that the result is 吋, the first setting sub-module 15 and the fourth judging sub-module 16 are operated, When the fourth judging sub-module 16 determines that the result is 吋, the second setting sub-module 17 is operated, and the feedback sub-module 18 is operated; when the first judging sub-module 11 determines that the result is no, the above-mentioned obtaining is performed. Module; when the second judging sub-module 12 determines that the result is no, the feedback sub-module 18 is operated; when the third judging sub-module 14 determines that the result is no, the fourth judging sub-module 16 is operated; The judgment sub-module 16 determines that the result is negative, and runs the feedback sub-module 18; the above modules are repeatedly operated until the current value is not less than the maximum boundary value, and the maximum value and the minimum value stored by the above-mentioned test modules are to be tested by the test module. The maximum value and the minimum value; the obtaining module 20 obtains the current working baud rate measurement value of the MCU; and the current acquisition module 20 needs to meet the current baud rate before driving. Not less than the maximum boundary value, and the above-mentioned obtaining module 20 performs the following effects in cooperation with the following sub-modules: The fifth determining sub-module 21 detects whether the communication flag is 1; the first measuring sub-module 22 is a communication flag 1吋, taking the average value of the maximum value and the minimum value of the baud rate as the measured value; the second measurement sub-module 23 when the communication flag is not 1吋, taking the default value of the baud rate as the measured value; 30: Calculate the measured operating frequency of the current MCU; the adjusting module 40 performs frequency adjustment on the MC U according to the above measured frequency, and adjusts to the standard operating frequency.

[0122]

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are used directly or indirectly. Other related technical fields are equally included in the scope of patent protection of the present invention.

Claims

Claim

[Claim 1] A mPOS-based MCU internal oscillation calibration method, comprising: obtaining a current working baud rate measurement value of the MCU;

Calculating the current measured working frequency of the MCU according to the current working baud rate of the MCU;

The MCU is frequency-adjusted according to the current measured operating frequency of the MCU and adjusted to the standard operating frequency.

[Claim 2] The mPOS-based MCU internal oscillation calibration method according to claim 1, wherein the conversion formula of the measured operating frequency comprises:

f BPR ) BPR

Among them: is the current working frequency of the MCU, f _standard is the standard working frequency of the above MCU, BPR is the measured value of the current MCU baud rate, and BPR _standard is the standard value of the current MCU baud rate.

[Claim 3] The mPOS-based MCU internal oscillation calibration method according to claim 1, wherein before the step of acquiring the current working baud rate measurement value of the MCU, the method further includes the step of testing the MCU current Working baud rate maximum and minimum;

The steps of testing the maximum and minimum operating baud rates of the current MCU include:

511. Check whether a current value of a baud rate of the MCU is less than a preset maximum boundary value.

512. If the current value is less than a preset maximum boundary value, send a test signal to the Bluetooth chip to detect whether the communication is successful; otherwise, perform the step of acquiring the current working baud rate measurement value of the MCU;

513, if the communication is successful, the communication flag is set to 1, otherwise, step S18;

514. Detect whether the current value is less than a minimum value.

515, if the current value is less than the minimum value, the current value is updated to a minimum value and saved, otherwise, step S16 is performed;

516. Detect whether the current value is greater than a maximum value.

517, if the current value is greater than the maximum value, the current value is updated to the maximum value and saved, otherwise, step S18; S18, adding the current value to 1, and returning to perform the step S11;

Repeating the above steps S11-S18 until the current value is not less than the maximum boundary value, and the maximum value and the minimum value stored by the , are tested for the step to test the maximum value of the current working baud rate and the minimum value of the MCU. Value and minimum.

[Claim 4] The mPOS-based MCU internal oscillation calibration method according to claim 3, wherein the step of acquiring the current working baud rate measurement value of the MCU further comprises detecting whether the communication flag is 1 ;

When the communication flag is 1吋, take the average value of the maximum and minimum values of the baud rate as the measured value. When the communication flag is not 1吋, the default value of the baud rate is taken as the measured value.

[Claim 5] The mPOS-based MCU internal oscillation calibration method according to claim 4, wherein before the step of testing the maximum and minimum operating baud rates of the current MCU, the method further includes:

The current value, maximum value, minimum value, default value, and maximum boundary value of the baud rate of the initialization port are preset.

[Claim 6] The mPOS-based MCU internal oscillation calibration device, comprising: an acquisition module, which acquires a current working baud rate measurement value of the MCU;

a conversion module, configured to calculate a current measurement operating frequency of the MC U according to the current working baud rate of the MCU;

The adjustment module is configured to perform frequency adjustment on the MCU according to the current measured working frequency of the MCU, and adjust to a standard working frequency.

[Claim 7] The mPOS-based MCU internal oscillation calibration apparatus according to claim 6, wherein the conversion formula of the estimated operating frequency converted by the conversion module comprises: f ― (ΐ BPR _CUII ) / BPR

Among them: is the current working frequency of the MCU, f _standard is the standard working frequency of the above MCU, BPR is the current MCU baud rate measurement value, and BPR _standard is the current MCU baud rate standard value. [Claim 8] The mPOS-based MCU internal oscillation calibration apparatus according to claim 6, further comprising a test module,

The test module includes:

a first determining submodule, configured to detect whether a current value of a baud rate of the MCU is less than a preset maximum boundary value;

a second determining sub-module, configured to send a test signal to the Bluetooth chip, and detect whether the communication success flag sub-module is used to set the communication flag to 1;

a third determining submodule, configured to detect whether the current value is less than a minimum value;

a first setting submodule, configured to update the current value to a minimum value and save the fourth determining submodule, configured to detect whether the current value is greater than a maximum value;

a second setting submodule, configured to update the current value to a maximum value and save; a feedback submodule, configured to add 1 to the current value, and run a first determining submodule; wherein, when the first Determining that the sub-module determines that the result is 吋, running the second determining sub-module; when the second determining sub-module determines that the result is 吋, running the flag sub-module and the third determining sub-module; Determining that the sub-module determines that the result is 吋, running the first setting sub-module and the fourth determining sub-module; and when the fourth determining sub-module determines that the result is 吋, running the second setting sub-module, And running the feedback sub-module; when the first determining sub-module determines that the result is no, the acquiring module is operated; when the second determining sub-module determines that the result is no, the feedback sub-module is operated; The third determining sub-module determines that the result is negative, and runs the fourth determining sub-module; when the fourth determining sub-module determines that the result is negative, the feedback sub-module is executed; To the current value is not less than the maximum boundary value, the stored inch maximum and minimum values for the test module to be tested out of the maximum and minimum values.

The oscillating calibration device of the mPOS-based MCU according to claim 8, wherein the acquiring module further comprises:

a fifth determining sub-module, configured to detect whether the communication flag is 1;

The first measuring submodule is configured to use the maximum and minimum baud rate when the communication flag is 1吋 The average value of the values is used as the measured value;

The second measurement sub-module is used when the communication flag is not 1吋, and the default value of the baud rate is the measured value.

[0081] The mPOS-based MCU internal oscillation calibration apparatus according to claim 9, further comprising:

Preset module, used to preset the current value, maximum value, minimum value, default value and maximum boundary value of the baud rate of the initialization port.