SD card including smart card and method for accessing to the same based on a file system

A smart SD card, including:

• SD interface, for providing an access interface for peripheral devices in the manner of file system, wherein a smart card interface file is set in the file system;
• SD storage unit, for providing a storage space;
• smart card, for providing application service;
• and
• SD controller, for identifying an operation to the file system from the peripheral devices, and accessing to the smart card if the operation directing to the smart card interface file, otherwise, accessing to the SD storage unit, wherein the smart card interface file is stored in a root directory of the file system with 0 byte length, and a feature of the interface file is set as hide.

A method for accessing to a smart SD card, including:

• an application procedure executing the writing operation to a smart card interface file, to inform a SD controller of establishing communication with a smart card;
• the application procedure reading the interface file and receiving response data returned by the smart card through the SD controller;
• the application procedure writing a smart card operation command into the interface file and the SD controller forwarding the commands to the smart card, when the communication is established successfully;
• and
• the application reading the interface file and receiving the response data returned by the smart card through the SD controller;
• wherein the application procedure receives the response data returned by the smart card as follows;
• the smart card returning the command response information to the SD controller, and the SD controller identifying the command response information, if the SD controller identifying that there is data returned, the SD controller automatically sending an obtaining command to obtain the response data;
• and the application procedure reading and obtaining the response data after the SD controller having received all of the response data.