System and method for achieving non-contact communication based on GPIO interface and smart card
A non-contact, communication system technology, applied in the field of non-contact communication, can solve the problems of small size, unsightly, and inability to have a large enough chip layout, and achieve the effect of increasing optional types and a solid and stable structure
Active Publication Date: 2015-06-24
WUHAN TIANYU INFORMATION IND
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Problems solved by technology
However, the chip on the SIM card and the main board of the mobile phone is much smaller than the conventional bus card, bank card, etc., and it is impossible to arrange a large enough antenna on the chip on the SIM card and the main board of the mobile phone to support the contactless function. It is to connect a large software antenna on the card, but this method has problems such as the software antenna is easy to break, takes up equipment space, and is not beautiful, and requires the chip to support a non-contact communication interface
However, because the GPIO interface is widely used, many chips support this interface instead of contactless communication interface.
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[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0038] see figure 1 As shown, the embodiment of the present invention provides a contactless communication system based on a GPIO interface, including a PCD (Proximity Coupling Device, proximity coupling device) and a smart card based on a GPIO interface for contactless communication, the smart card interacts with the PCD, and the interactive The data includes a number of logic 1s and a number of logic 0s. The smart card includes a DCLB (Digital Contactless Bridge, digital non-contact bridge) interface, a square wave processing module and an MCU (Micro Control Unit, micro control unit) with a GPIO interface. The MCU includes 4 A general-purpose input and output GPIO pin: GPIO_0 pin, GPIO_1 pin, GPIO_2 pin and GPIO_3 pin, DCLB interface includes DCLB_IO (digital contactless bridge-input and output) pin and DCLB_CLK (digital contactless...
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The invention discloses a system and method for achieving non-contact communication based on a GPIO interface and a smart card, and relates to the field of non-contact communications. The method includes the following steps that a PCD sends a carrier wave, a DCLB_CLK pin of a DCLB interface outputs a square wave to a square wave processing module, and a DCLB_IO pin outputs a square wave to a GPIO_0 pin of an MCU; whether the data sent by the PCD belong to the logic 1 or the logic 0 is analyzed by the MCU, and the square wave processing module generates a frequency division square wave; the MCU controls a 16 frequency division square wave to be output to the DCLB_IO pin according to the data needing to be sent so that load modulation can be conducted on the carrier wave; whether the data sent by the MCU belong to the logic 1 or the logic 0 is analyzed by the PCD. According to the system and method, non-contact communication can be achieved on the smart card which does not support a non-contact communication interface, the number of the selectable types of smart card chips is effectively increased, an antenna can be integrated into the smart card, it is guaranteed that the appearance of the smart card is the same as that of a common card, and the structure of the smart card is firmer and more stable.
Description
technical field [0001] The present invention relates to the field of non-contact communication, especially financial IC (Integrated Circuit, integrated circuit) card or mobile payment industry, in particular to a kind of non-contact communication based on GPIO (General Purpose Input Output, general purpose input / output) interface System, method and smart card. Background technique [0002] Smart cards are used more and more widely, and the main uses are divided into four categories: identification, payment tools, encryption and decryption, and information transmission. Smart cards can be divided into contact and contactless cards in terms of communication methods. Contactless cards are widely used in many fields such as bus cards, bank cards, social security cards, and ID cards because they are convenient and fast to swipe. If the functions of different cards can be integrated on other devices, the number of cards to be carried will be reduced, which will bring convenience ...
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Login to View More IPC IPC(8): G06K19/07H04B5/00
Inventor 严泽旭董逢华熊传光
Owner WUHAN TIANYU INFORMATION IND