Method for enhancing communication stability between non-contact card and card reader
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A non-contact card and card reader technology, applied in the field of communication, can solve the problems of low success rate, poor stability, error reporting, etc., and achieve the effect of improving communication stability
Active Publication Date: 2013-01-16
FEITIAN TECHNOLOGIES
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Problems solved by technology
[0003] In the process of realizing the present invention, the inventor found that the prior art has at least the following disadvantages: the communication between the existing contactless card reader and the contactless card is easily interfered by external radio frequency, the stability is poor, and when both parties receive After receiving the wrong data frame, it will directly perform error processing, such as error reporting, retransmission, etc., so that the data is received multiple times in the case of frequent interference, and the success rate is low
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Embodiment 1
[0069] see figure 1 , the embodiment of the present invention provides a specific implementation method for enhancing the communication stability between a contactless card and a card reader. , the card reader receives the command sent from the buffer in the USB interrupt pipeline mode, if the first byte of the command is within the preset range (0x01-0x03), it means that a valid command has been received, if the card reader does not receive it Or the first byte of the received command does not meet the preset value, then the received command is not a valid command; the card reader performs the following operations after receiving a valid command:
[0070] Step 101: Determine the command type, if it is a notification card search command, then perform step 102, if it is an APDU command, then perform step 108, if it is an extended command, then perform step 122;
[0071] Preferably, in this embodiment, the card reader judges the first byte of the command received, if it is 0x01...
Embodiment 2
[0132] see image 3 , the embodiment of the present invention provides a specific implementation method for enhancing the communication stability between a contactless card and a card reader. , the card reader receives the command sent from the buffer in the USB interrupt pipeline mode, if the first byte of the command is within the preset range (0x01-0x03), it means that a valid command has been received, if the card reader does not receive it Or the first byte of the received command does not meet the preset value, then the received command is not a valid command; the card reader performs the following operations after receiving a valid command:
[0133] Step 201: Determine the command type, if it is a notification card search command, then perform step 202, if it is an APDU command, then perform step 208, if it is an extended command, then perform step 222;
[0134] Preferably, in this embodiment, the card reader judges the first byte of the command received, if it is 0x01...
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Abstract
The invention discloses a method for enhancing communication stability between a non-contact card and a card reader, belonging to the field of communication technology. The method provided by the invention comprises the following steps: starting timeout timing and a receiver by the card reader to wait for receiving data; stopping the timeout timing when detecting a subcarrier before timeout and receiving data and judging whether received data frames have frame errors; if the received data frames have frame errors, discarding the data frames and continuing timeout timing; if the received data frames have no frame errors, judging whether CRC (cyclic redundancy check) and / or odd-even check for the data frames are / is correct or not; if the CRC and / or odd-even check for the data frames are / is correct, judging whether the data frames have other errors; if the data frames have other errors, discarding the data frames and continuing timeout timing; if the data frames have no other errors, closing the receiver and sending the received data to an upper computer; if the CRC and / or odd-even check for the data frames are / is incorrect, judging whether the lengths of the data frames is less than a pre-set byte; if the lengths of the data frames is less than the pre-set byte, discarding the data frames and continuing timeout timing; if the lengths of the data frames is not less than the pre-set byte, judging whether the data frames is complete or not; if the data frames is complete, closing the receiver; if the data frames is incomplete, discarding the data frames and continuing timeout timing.
Description
technical field [0001] The invention belongs to the technical field of communication, in particular to a method for enhancing the stability of a non-contact card and a card reader. Background technique [0002] Contactless card is a new type of smart card, which combines radio frequency technology and IC card technology. Its function is the same as that of contact ID card and IC card, except that it does not need power supply. The receiving antenna takes power from the magnetic field induction of the card reader, and works. data, fed back to the reader. Compared with contact IC cards, contactless cards have the advantages of high reliability, convenient operation, anti-collision, suitable for various applications, and good encryption performance, so they are widely used. [0003] In the process of realizing the present invention, the inventor found that the prior art has at least the following disadvantages: the communication between the existing contactless card reader and...
Claims
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Application Information
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