CN114565069A - Data transmission system of contact card and control method thereof - Google Patents
Data transmission system of contact card and control method thereof Download PDFInfo
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- CN114565069A CN114565069A CN202210088053.8A CN202210088053A CN114565069A CN 114565069 A CN114565069 A CN 114565069A CN 202210088053 A CN202210088053 A CN 202210088053A CN 114565069 A CN114565069 A CN 114565069A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000005540 biological transmission Effects 0.000 title claims abstract description 17
- 238000004590 computer program Methods 0.000 claims description 8
- 230000001960 triggered effect Effects 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000006870 function Effects 0.000 description 12
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/0772—Physical layout of the record carrier
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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
Abstract
The invention provides a data transmission system of a contact card and a control method thereof, wherein the data transmission system of the contact card comprises: the device comprises a contact card and an MCU, wherein a PWM output pin of the MCU is connected with a clock input pin of the contact card, a GPIO pin of the MCU is connected with an IO pin of the contact card, and an external clock input pin of a timer of the MCU is connected with the PWM output pin of the MCU. According to the data transmission system of the contact card, the function of an ISO7816 interface can be realized by adopting a general MCU, so that the hardware cost is greatly reduced, and the universality of the system is improved.
Description
Technical Field
The invention relates to the technical field of data transmission, in particular to a data transmission system of a contact card and a control method of a data reading system of the contact card.
Background
With the widespread use of smart cards, there is an increasing demand for card reader devices. Card reader devices include contact and contactless, where contact card communications need to conform to the ISO7816-3 standard card reading timing. Therefore, an external extended card reading chip or a special MCU with an ISO7816 interface is required, which undoubtedly greatly increases the equipment cost and the difficulty of MCU type selection.
Disclosure of Invention
In order to solve the technical problems, the invention provides a data transmission system of a contact card, which can realize the function of an ISO7816 interface by adopting a general MCU, thereby greatly reducing the hardware cost and improving the universality of the system.
The technical scheme adopted by the invention is as follows:
a data transmission system for a contact card, comprising: the device comprises a contact card and an MCU, wherein a PWM output pin of the MCU is connected with a clock input pin of the contact card, a GPIO pin of the MCU is connected with an IO pin of the contact card, and an external clock input pin of a timer of the MCU is connected with the PWM output pin of the MCU.
Setting the PWM output frequency of the MCU to be 1-5MHz, setting the PWM duty cycle of the MCU to be 33% -67%, selecting an external clock source for a timer of the MCU, adopting a comparator mode for the timer of the MCU, wherein the comparator overflow automatic overload is set to be 0, and the threshold value of the comparator is set to be 186.
A control method of a data reading system of a contact card comprises the following steps: when the MCU sends first data to the contact card, judging whether to trigger timer interruption or not; if the timer is triggered to be interrupted, the interruption counter is automatically increased by 1; judging whether the interrupt counter is an odd number; if the interrupt counter is odd, judging whether the interrupt counter is 1; if the interrupt counter is 1, setting the IO pin of the contact card to be at a low level, and sending a start bit; if the interrupt counter is not 1, judging whether the interrupt counter is K or not, wherein K is an odd number larger than 3; if the interrupt counter is K, an IO pin of the contact card is set and a parity check bit is sent; if the interrupt counter is not K, judging whether the interrupt counter is K + 2; if the interrupt counter is not K +2, setting an IO pin of the contact card and sending the first data; and if the interrupt counter is K +2, setting the IO pin of the contact card to be at a high level, finishing sending the first data, and setting the interrupt counter to be zero.
The control method of the data reading system of the contact card further comprises the following steps: when the MCU reads the second data of the contact card, judging whether to trigger the timer to interrupt; if the timer is triggered to be interrupted, the interruption counter is automatically increased by 1; judging whether the interrupt counter is an even number; if the interrupt counter is an even number, judging whether the interrupt counter is 2; if the interrupt counter is 2, judging whether the IO pin of the contact card is in a low level, and setting the interrupt counter to be zero when the IO pin of the contact card is judged to be in the low level; if the interrupt counter is not 2, judging whether the interrupt counter is K + 1; if the interrupt counter is not K +1, reading IO pin storage bit data of the contact card; if the interrupt counter is K +1, reading the parity check bit of the IO pin of the contact card; judging whether the read second data is normal or not according to the parity check bit; if the second data is normal, saving the second data and setting the interrupt counter to be zero; and if the interrupt counter is abnormal, performing abnormal alarm and setting the interrupt counter to be zero.
A computer device comprises a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor implements the control method of the data reading system of the contact card when executing the computer program.
A non-transitory computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, implements the control method of the data reading system of a contact card described above.
The invention has the beneficial effects that:
the invention can realize the function of the ISO7816 interface by adopting the universal MCU, thereby greatly reducing the hardware cost and improving the universality of the system.
Drawings
Fig. 1 is a block diagram illustrating a data transmission system of a contact card according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a data transmission system of a contact card according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for controlling a data transmission system of a contact card according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a block schematic diagram of a data transmission system of a contact card according to an embodiment of the present invention.
As shown in fig. 1, a data transmission system of a contact card according to an embodiment of the present invention may include: a contact card 100 and an MCU (Micro Control Unit) 100. The PWM output pin of the MCU200 is connected to the clock input pin (CLK pin) of the contact card 100, the GPIO pin of the MCU200 is connected to the IO pin of the contact card 100, and the TIMER external clock input pin (TIMER CLK pin) of the MCU200 is connected to the PWM output pin of the MCU 200.
Specifically, the ISO7816 interface needs to introduce etu as a basic time unit, where 1etu is 372/f and f is a clock frequency. Therefore, after the PWM output of the MCU200 is used as the clock input of the contact card, the GPIO pin of the MCU200 is connected to the IO port of the contact card 100, and the PWM pin of the MCU200 is connected to the external clock input pin of the timer of the MCU200, the PWM output frequency of the MCU200 may be set to 1-5MHz, the duty cycle of the MCU200 may be set to 33% -67% (e.g., 50%) to simulate a clock conforming to the ISO7816 interface, the timer of the MCU200 is set to use an external clock source, the timer of the MCU200 uses a comparator mode, and the comparator overflow automatic reload is set to 0, and the comparator threshold is set to 186. At this time, the timer interrupt interval meets 0.5etu time of an ISO7816 interface. On the basis of which the communication function of the contact card 100 can be accurately completed.
The data transmission system of the contact card according to the embodiment of the invention comprises: the device comprises a contact card and an MCU, wherein a PWM output pin of the MCU is connected with a clock input pin of the contact card, a GPIO pin of the MCU is connected with an IO pin of the contact card, and an external clock input pin of a timer of the MCU is connected with the PWM output pin of the MCU. Therefore, the function of the ISO7816 interface can be realized by adopting the universal MCU, the hardware cost is greatly reduced, and the universality of the system is improved.
The following describes a data reading system based on a contact card in detail with reference to specific embodiments to implement the communication function of the contact card 100.
Specifically, before the MCU and the contact card perform data transmission, the PWM output pin of the MCU may be initialized, the timer may be interrupted in the capture mode by using an external clock, and the timer interrupt counter may be cleared to enable the timer to be interrupted, and start the output of the PWM output pin of the MCU.
Further, as shown in fig. 2, when transmitting data to the contact card through the MCU, the control method of the data reading system of the contact card may include the steps of:
s201, when the MCU sends first data to the contact card, whether the timer is triggered to interrupt is judged.
S202, if the timer is triggered to be interrupted, the interruption counter is automatically increased by 1.
S203, judging whether the interrupt counter is an odd number.
S204, if the interrupt counter is odd, judging whether the interrupt counter is 1.
S205, if the interrupt counter is 1, the IO pin of the contact card is set to low level, and a start bit is sent.
S206, if the interrupt counter is not 1, judging whether the interrupt counter is K, wherein K is an odd number larger than 3. For example, K may be 19.
S207, if the interrupt counter is K, setting an IO pin of the contact card and sending a parity check bit;
s208, if the interrupt counter is not K, judging whether the interrupt counter is K + 2;
s209, if the interrupt counter is not K +2, setting an IO pin of the contact card and sending first data;
s210, if the interrupt counter is K +2, setting the IO pin of the contact card to be at a high level, finishing sending the first data, and setting the interrupt counter to be zero.
Further, as shown in fig. 3, when the MCU transmits data to the contact card, the method for controlling the data reading system of the contact card may further include the following steps:
s301, when the MCU reads the second data of the contact card, judging whether to trigger the timer to interrupt.
S302, if the timer is triggered to be interrupted, the interruption counter is automatically increased by 1.
S303, judging whether the interrupt counter is an even number.
S304, if the interrupt counter is even, judging whether the interrupt counter is 2.
S305, if the interrupt counter is 2, judging whether the IO pin of the contact card is in a low level, and setting the interrupt counter to be zero when the IO pin of the contact card is judged to be in the low level.
S306, if the interrupt counter is not 2, judging whether the interrupt counter is K + 1.
And S307, if the interrupt counter is not K +1, reading the IO pin saving bit data of the contact card.
S308, if the interrupt counter is K +1, reading the parity check bit of the IO pin of the contact card.
S309, determining whether the read second data is normal according to the parity bit.
S310, if the data is normal, saving the second data and setting the interrupt counter to be zero.
S311, if the system is abnormal, an abnormal alarm is given and the interrupt counter is set to zero.
The control method of the data reading system of the contact card comprises the following steps: when the MCU sends first data to the contact card, judging whether to trigger the timer to interrupt; if the trigger timer is interrupted, the interrupt counter automatically adds 1; judging whether the interrupt counter is an odd number; if the interrupt counter is odd, judging whether the interrupt counter is 1; if the interrupt counter is 1, setting the IO pin of the contact card to be at a low level and sending a start bit; if the interrupt counter is not 1, judging whether the interrupt counter is K, wherein K is an odd number larger than 3; if the interrupt counter is K, an IO pin of the contact card is set and a parity check bit is sent; if the interrupt counter is not K, judging whether the interrupt counter is K + 2; if the interrupt counter is not K +2, an IO pin of the contact card is set and first data is sent; and if the interrupt counter is K +2, setting the IO pin of the contact card to be at a high level, finishing sending the first data, and setting the interrupt counter to be zero. Therefore, the function of the ISO7816 interface can be realized by adopting the universal MCU, the hardware cost is greatly reduced, and the universality of the system is improved.
The invention further provides a computer device corresponding to the embodiment.
The computer device of the embodiment of the invention comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, and when the processor executes the program, the control method of the data reading system of the contact card of the embodiment is realized.
According to the computer equipment provided by the embodiment of the invention, the function of the ISO7816 interface can be realized by adopting the universal MCU, so that the hardware cost is greatly reduced, and the universality of the system is improved.
In response to the above embodiments, the present invention also provides a non-transitory computer-readable storage medium.
A non-transitory computer-readable storage medium of an embodiment of the present invention stores thereon a computer program that, when executed by a processor, implements the control method of the data reading system of a contact card described above.
According to the non-transitory computer readable storage medium provided by the embodiment of the invention, the function of the ISO7816 interface can be realized by adopting a general MCU, so that the hardware cost is greatly reduced, and the universality of the system is improved.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A data transmission system for a contact card, comprising: the device comprises a contact card and an MCU, wherein a PWM output pin of the MCU is connected with a clock input pin of the contact card, a GPIO pin of the MCU is connected with an IO pin of the contact card, and an external clock input pin of a timer of the MCU is connected with the PWM output pin of the MCU.
2. The data reading system of the contact card according to claim 1, wherein the PWM output frequency of the MCU is set to 1-5MHz, and the PWM duty cycle of the MCU is set to 33% -67%, the timer of the MCU selects an external clock source, the timer of the MCU adopts a comparator mode, wherein the comparator overflow automatic reload is set to 0, and the comparator threshold is set to 186.
3. A control method of a data reading system based on a contact card according to any one of claims 1-2, characterized by comprising the steps of:
when the MCU sends first data to the contact card, judging whether to trigger timer interruption or not;
if the timer is triggered to be interrupted, the interruption counter is automatically increased by 1;
judging whether the interrupt counter is an odd number;
if the interrupt counter is odd, judging whether the interrupt counter is 1;
if the interrupt counter is 1, setting an IO pin of the contact card to be at a low level, and sending a start bit;
if the interrupt counter is not 1, judging whether the interrupt counter is K or not, wherein K is an odd number larger than 3;
if the interrupt counter is K, an IO pin of the contact card is set and a parity check bit is sent;
if the interrupt counter is not K, judging whether the interrupt counter is K + 2;
if the interrupt counter is not K +2, setting an IO pin of the contact card and sending the first data;
and if the interrupt counter is K +2, setting the IO pin of the contact card to be at a high level, finishing sending the first data, and setting the interrupt counter to be zero.
4. The method for controlling a data reading system of a contact card according to claim 3, further comprising the steps of:
when the MCU reads the second data of the contact card, judging whether to trigger the timer to interrupt;
if the timer is triggered to be interrupted, the interruption counter is automatically increased by 1;
judging whether the interrupt counter is an even number;
if the interrupt counter is an even number, judging whether the interrupt counter is 2;
if the interrupt counter is 2, judging whether the IO pin of the contact card is in a low level, and setting the interrupt counter to be zero when the IO pin of the contact card is judged to be in the low level;
if the interrupt counter is not 2, judging whether the interrupt counter is K + 1;
if the interrupt counter is not K +1, reading IO pin storage bit data of the contact card;
if the interrupt counter is K +1, reading the parity check bit of the IO pin of the contact card;
judging whether the read second data is normal or not according to the parity check bit;
if the second data is normal, saving the second data and setting the interrupt counter to be zero;
and if the interrupt counter is abnormal, performing abnormal alarm and setting the interrupt counter to be zero.
5. Computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements a method of controlling a data reading system of a contact card according to any of claims 3 and 4 when executing the computer program.
6. A non-transitory computer-readable storage medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements a control method of a data reading system of a contact card according to any one of claims 3 and 4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210088053.8A CN114565069A (en) | 2022-01-25 | 2022-01-25 | Data transmission system of contact card and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210088053.8A CN114565069A (en) | 2022-01-25 | 2022-01-25 | Data transmission system of contact card and control method thereof |
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| CN103679257A (en) * | 2013-12-30 | 2014-03-26 | 北京大唐智能卡技术有限公司 | Non-contact payment telecom integrated circuit card and implement method |
| CN104732264A (en) * | 2015-03-27 | 2015-06-24 | 武汉天喻信息产业股份有限公司 | System and method for achieving non-contact communication based on GPIO interface and smart card |
| CN108469726A (en) * | 2018-03-19 | 2018-08-31 | 南开大学 | A kind of variable parameter PID motion controller implementation method based on EthernetPowerlink |
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2022
- 2022-01-25 CN CN202210088053.8A patent/CN114565069A/en active Pending
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| US20040143710A1 (en) * | 2002-12-02 | 2004-07-22 | Walmsley Simon Robert | Cache updating method and apparatus |
| CN102541776A (en) * | 2010-12-22 | 2012-07-04 | 安凯(广州)微电子技术有限公司 | Method for simulating contact type smart IC (integrated circuit) card interface on application processor chip |
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