Data card read-write method, interface control method and apparatus

Abstract

The invention relates to a method for reading and writing a data card, a method and a device for controlling an interface of the data card. The read-write method comprises the following steps: a microprocessor sends a read mark to a bus state inquiry command; the read mark is detected, if the mark is a free mark, an application bus conversion command is sent, so as to write in a local mark to work as a mark for the microprocessor, if the mark is one of other marks, the inquiry is continued, and if the mark is a local mark, the mark and the data card conduct read operation and / or write operation through an interface control device; and the microprocessor sends a release command to write in a free mark for releasing bus resource. The interface control method comprises the following steps: reading the mark and carrying out feedback when receiving an inquiry bus state command; writing a mark as a mark for connecting the micro processor when receiving the application bus conversion command; conducting read and write; and writing a free mark to release resource when receiving a release command. The device comprises a function module for realizing the interface control method. The invention realizes that a plurality of microprocessors can share a data card.

Description

technical field [0001] The invention relates to a data processing technology, in particular to a data card reading and writing method, a data card interface control method and a device. Background technique [0002] At present, data cards have become a common tool in people's life and work, such as Compact Flash (hereinafter referred to as: CF) card, Multi Media Card (Multi Media Card; hereinafter referred to as: MMC) and Secure Digital Memory Card (Secure Digital Memory) Card; hereinafter referred to as: SD), etc. Among them, the SD card is a commonly used data card, which belongs to a memory device based on semiconductor flash memory, and has high memory capacity, fast data transmission rate, great mobility flexibility and good security. Data cards generally can perform data interaction through various bus modes. For example, an SD card can implement data interaction with a microprocessor through an SD bus mode or a Serial Peripheral Interface (Serial Peripheral Interface...

AI Technical Summary

Problems solved by technology

However, the prior art has the following defects: the card reader chip can only support the USB interface, and cannot exchange data with the microprocessor in a local bus mode; Card read and write access, which is difficult to meet the needs of dual microprocessor devices to share data in data cards, especially communication products in some special application environments, which often require multiple microprocessors to share data in data cards

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