CN111428841A

CN111428841A - Memory card identification method and mobile device

Info

Publication number: CN111428841A
Application number: CN201811585274.6A
Authority: CN
Inventors: 谢灵聪; 郭丹; 邓恩华; 李志雄
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2020-07-17
Also published as: WO2020134039A1

Abstract

The application discloses a memory card identification method and mobile equipment, wherein the memory card identification method comprises the following steps: pulling down the potential of a command pin of a memory card to be identified; detecting whether a data pin of the memory card has a response; and identifying the memory card as a first type memory card or a second type memory card according to the response condition of the data pin. By the method, the identification process of the memory card can be shortened, and the identification speed is increased.

Description

Memory card identification method and mobile device

Technical Field

The present application relates to the field of storage technologies, and in particular, to a method for identifying a memory card and a mobile device.

Background

The memory card is supported by more and more terminal devices due to the characteristics of large memory capacity, convenience in carrying, high reading and writing speed and the like. At present, after a memory card is inserted, a terminal device loads data on the memory card through an identification program to identify the memory card.

Taking the MMC card and the SD card as an example, in identifying the MMC card and the SD card, a CMD8 command and an ACMD41 command are generally employed to determine whether the SD card responds to identify the SD card. This approach requires two steps to implement, is slow, and has low recognition efficiency.

Disclosure of Invention

The application mainly provides a memory card identification method and mobile equipment, and can solve the problem that in the prior art, the identification speed of a memory card is low.

One mode adopted by the present application is to provide a method for identifying a memory card, the method including: pulling down the potential of a command pin of a memory card to be identified; detecting whether a data pin of the memory card has a response; and identifying the memory card as a first type memory card or a second type memory card according to the response condition of the data pin.

The step of identifying the memory card as the first type memory card or the second type memory card according to the response condition of the data pin comprises the following steps: if there is a response, the memory card is identified as a first type of memory card. If there is no response, the memory card is identified as a second type of memory card.

The step of pulling down the potential of the command pin of the memory card to be identified comprises the following steps: and pulling down the command pin of the memory card to be identified for at least a preset clock period.

The step of detecting whether the data pin of the memory card has a response includes: whether the data pin of the memory card has data output in the preset time is detected.

Wherein, after the step of identifying the memory card as the first type of memory card, further comprising: initializing a first type memory card by adopting an initialization command of a first type memory card communication protocol; after the step of identifying the memory card as the second type of memory card, the method further comprises: and initializing the second type memory card by adopting an initialization command of a second type memory card communication protocol.

Before the step of pulling down the potential of the command pin of the memory card to be identified, the method further comprises the following steps: and sending a reset command shared by the first type of memory card communication protocol and the second type of memory card communication protocol to a command pin of the memory card to be identified so as to enable the memory card to be identified to enter an idle state.

The first memory card is an MMC card, and the second memory card is an SD card.

Wherein the initialization command is a CMD1 command; and/or the reset command is the CMD0 command.

Before the step of pulling down the potential of the command pin of the memory card to be identified, the method further comprises the following steps: the memory card is powered on.

One mode adopted by the present application is to provide a mobile device, where the mobile device includes a controller and a card slot, the card slot is used to accommodate a memory card and electrically connect the memory card with the controller, and the controller is used to identify the memory card by using the above method.

The identification method of the memory card comprises the following steps: pulling down the potential of a command pin of a memory card to be identified; detecting whether a data pin of the memory card has a response; and identifying the memory card as a first type memory card or a second type memory card according to the response condition of the data pin. Through the mode, the problem that response failure possibly occurs in the existing mode of sending the command can be avoided, and the identification speed is increased.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

fig. 1 is a schematic flowchart of a first embodiment of an identification method of a memory card provided in the present application;

fig. 2 is a schematic flowchart of a second embodiment of an identification method of a memory card provided in the present application;

fig. 3 is a schematic flowchart of a third embodiment of an identification method of a memory card provided in the present application;

fig. 4 is a schematic flowchart of a fourth embodiment of an identification method of a memory card provided by the present application;

FIG. 5 is a schematic block diagram of an embodiment of a mobile device provided herein;

fig. 6 is a schematic structural diagram of a card holder in an embodiment of the mobile device provided in the present application.

Detailed Description

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The memory card is an independent storage medium used in mobile phones, digital cameras, portable computers, MP3 and other digital products, and is generally in the form of a card, and is also called as a "memory card", which is also called as a "digital memory card", a "memory card", and the like.

Referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of an identification method of a memory card provided in the present application, where the method includes:

step 11: and pulling down the potential of the command pin of the memory card to be identified.

The potential of the command pin of the memory card to be identified is pulled down, and the command pin of the memory card can be grounded.

Step 12: it is detected whether a response exists in the data pin of the memory card.

Here, it is mainly detected whether the data pin of the memory card can read data.

Alternatively, after power-on or reset, if the CMD line is held for not less than a preset number of clock cycles (clock), the device recognizes that the boot mode of operation is initiated and the internal portion begins to prepare boot data. The host (host) can read the data from [ 5: and 3] reading the boot data from the selected boot area, and within a preset time after the CMD line is pulled down by a preset clock, starting to send the first boot data to the host through the DAT line by the device, wherein the host must keep the CMD line low to read the boot data (push-pull mode).

Step 13: and identifying the memory card as a first type memory card or a second type memory card according to the response condition of the data pin.

It is understood that, in the above embodiments, after the first type of memory card pulls down the voltage of the command pin for a predetermined clock period, the data pin of the first type of memory card will respond, i.e. data can be read, while the second type of memory card will not respond. Thus, the first-type memory card and the second memory card can be identified in this manner.

Different from the prior art, the method for identifying the memory card provided by the embodiment includes: pulling down the potential of a command pin of a memory card to be identified; detecting whether a data pin of the memory card has a response; and identifying the memory card as a first type memory card or a second type memory card according to the response condition of the data pin. Through the mode, the problem that response failure possibly occurs in the existing mode of sending the command can be avoided, and the identification speed is increased.

The following embodiments take the first memory card as an MMC card and the second memory card as an SD card as an example, and describe the identification method of the present invention in detail.

An SD Card (Secure Digital Memory Card) is a new generation of Memory devices based on semiconductor flash Memory, and has high Memory capacity, fast data transfer rate, great mobility and good security. The SD cards generally include standard SD cards and Micro SD cards.

MMC is an abbreviation of Multi Media Card, i.e., MultiMedia Card. The non-volatile memory device is a non-volatile memory device, has small volume, large capacity, low power consumption and high transmission speed, and is widely applied to consumer electronic products. An MMC is an interface protocol (a card type), and memory devices that can conform to this interface are all called MMC memory banks (MMC cards).

The MMC card and SD card identification method is described below.

The MMC card has seven pins, and is divided into two operation modes, namely an MMC mode (also called an MMC identification mode) and an SPI mode.

The MMC mode mainly includes the following three states:

1. the idle state is a state entered after the MMC card is reset;

2. the preparation state is the state after the MMC card is matched with the voltage range;

3. the identification state is a state that the MMC card enters after responding to the CID.

The pins of the MMC card are shown in the following table:

the SD card has nine pins, and is divided into two operation modes, namely an SD mode and an SPI mode. In this embodiment, the SD card mainly operates in the SD mode, and therefore the DAT3 pin of the SD card cannot be grounded, so as to prevent the SD card from being switched to the SPI mode. Specifically, the DAT3 pin of the memory card to be identified is powered up so that the DAT3 pin is in a non-grounded state.

The pins of the SD card are shown in the following table:

pin number	Name (R)	Function (SD mode)	Function (SPI mode)
				1	DAT3/CS	Data 3	Chip selection
2	CMD/DI	Command	Master-out-from-master-in
				3	VSS1	GND	GND
4	VDD	Power supply	Power supply
				5	CLK	Clock (CN)	Clock (CN)
6	VSS2	GND	GND
				7	DAT0/DO	Data 0	Main in and slave out
8	DAT1/IRQ	Data 1	Retention
				9	DAT2/NC	Data 2	Retention

Referring to fig. 2, fig. 2 is a schematic flow chart of a second embodiment of the identification method of the memory card provided in the present application, the method includes:

step 21: and pulling down the command pin of the memory card to be identified for at least a preset clock period.

Step 22: whether the data pin of the memory card has data output in the preset time is detected.

Here, it is mainly detected whether the data pin of the memory card can read data. If there is data to be output, go to step 23, and if there is no data to be output, go to step 24.

Alternatively, after power-up or reset, if the CMD line is held for no less than 74clock cycles (clock), the device recognizes that the boot mode of operation is enabled and the internal portion begins to prepare boot data. The host (host) can read the data from [ 5: 3] the selected boot area is used to read the boot data, and within a preset time after pulling the CMD line down 74clock, the device starts to send the first boot data to the host through the DAT line, and the host must keep the CMD line low to read the boot data (push-pull mode).

In a specific embodiment, the following may be implemented: and pulling down the command pin of the memory card to be identified for at least 74clock cycles, and detecting whether the data pin of the memory card has data output within 1 second.

Step 23: the memory card is identified as an MMC card.

Step 24: the memory card is identified as an SD card.

Specifically, with reference to the step 22, since the detection method in this embodiment mainly determines whether the memory card to be identified is an MMC card, and the command SD card does not respond, when detecting whether the memory card has data output, only the 7 th pin needs to be detected, and if there is no response, it can be determined that the memory card is an SD card.

The method for identifying the memory card provided by the embodiment comprises the following steps: pulling down the potential of a command pin of a memory card to be identified; detecting whether a data pin of the memory card has a response; and identifying the memory card as an MMC card or an SD card according to the response condition of the data pin. Through the mode, the MMC protocol type card is identified by utilizing the protocol characteristics of the MMC card, and the method is different from the SD card identification mode which adopts CMD8 and ACMD41 commands to carry out two steps in the prior art, and can shorten the identification process and accelerate the identification speed.

Referring to fig. 3, fig. 3 is a schematic flow chart of a third embodiment of the memory card identification method provided in the present application, where the method includes:

step 31: and sending a reset command shared by the MMC protocol and the SD protocol to a command pin of the memory card to be identified so as to enable the memory card to be identified to enter an idle state.

Wherein the reset command is CMD 0.

Step 32: the command pin of the memory card is pulled low for at least 74clock cycles.

Step 33: and detecting whether the data pin of the memory card has data output within 1 second.

If there is data to be output, step 34 is executed, and if there is no data to be output, step 35 is executed.

Step 34: the memory card is identified as an MMC card.

After the memory card is recognized as the MMC card, the MMC card may be directly operated accordingly based on the MMC protocol.

Step 35: the memory card is identified as an SD card.

In addition, after the identification is completed, an initialization operation may also be performed on the responding memory card.

Specifically, if the first type memory card is identified, the first type memory card is initialized by using the initialization command of the first type memory card communication protocol, and if the second type memory card is identified, the second type memory card is initialized by using the initialization command of the second type memory card communication protocol.

Taking the MMC card and the SD card as an example, the initialization command of the MMC card is CMD1, so the initialization can be performed by sending a CMD1 command, and the SD card can be initialized by using a CMD8 command and an ACMD41 command.

Referring to fig. 4, fig. 4 is a schematic flowchart of a fourth embodiment of the identification method for a memory card provided by the present application, where the method includes:

step 41: and powering on the memory card to be identified.

It can be understood that the operating voltage of the MMC card is 2.7V-3.6V, the identification voltage is 1.8V and 2.7V-3.6V, and the operating voltage of the SD card is 3.3V, during the identification process of the memory card, because the present embodiment is based on the identification of the MMC protocol, the voltage of 1.8V or 3.3V can be used in step 41 to ensure that the identification can be performed on the MMC protocol.

Optionally, in this step, the memory card is powered on by using a voltage of 3.3V.

Optionally, between step 41 and step 42, the method may further include: and sending a reset command shared by the MMC protocol and the SD protocol to a command pin of the memory card to be identified so as to enable the memory card to be identified to enter an idle state.

Wherein the reset command is CMD 0.

Step 42: the command pin of the memory card is pulled low for at least 74clock cycles.

Step 43: and detecting whether the data pin of the memory card has data output within 1 second.

If there is data to be output, step 44 is executed, and if there is no data to be output, step 45 is executed.

Step 44: the memory card is identified as an MMC card.

Specifically, since the previous power-on uses a voltage of 1.8V, the MMC card can be directly operated based on the MMC protocol after the memory card is identified as the MMC card. In addition, since the MMC card also supports 3.3V voltage, the voltage can also be adjusted to 3.3V.

Step 45: the memory card is identified as an SD card.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the mobile device provided in the present application, where the mobile device 50 includes a controller 51 and a card holder 52 that can be embedded in a main body of the mobile device 50, the card holder 52 is provided with a card slot 52a, the card slot 52a is used for accommodating a memory card and electrically connecting the memory card with the controller 51, and the controller 51 is used for identifying different types of memory cards in the manner described above.

As shown in fig. 6, fig. 6 is a schematic structural diagram of a card holder in an embodiment of the mobile device provided in the present application, where the card holder 52 includes a first card slot 52a and a second card slot 52b, and the first card slot 52a and the second card slot 52b have the same shape, where the first card slot 52a and the second card slot 52b are used to accommodate multiple types of memory cards provided in the above embodiment.

Wherein, this mobile device can be wearing equipment such as cell-phone, panel computer, intelligent wrist-watch.

In addition, the mobile device may further include a memory for storing program data, which when executed by the controller 51, implements the identification method as described above.

Embodiments of the present application may be implemented in software functional units and may be stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A method for identifying a memory card, the method comprising:

pulling down the potential of a command pin of a memory card to be identified;

detecting whether a response exists in a data pin of the memory card;

and identifying the memory card as a first type memory card or a second type memory card according to the response condition of the data pin.

2. The method of claim 1,

the step of identifying the memory card as a first type memory card or a second type memory card according to the response condition of the data pin includes:

if there is a response, the memory card is identified as a first type of memory card.

And if no response exists, identifying the memory card as a second type of memory card.

3. The method according to claim 1 or 2,

the step of pulling down the potential of the command pin of the memory card to be identified comprises the following steps:

and pulling down the command pin of the memory card to be identified for at least a preset clock period.

4. The method of claim 3,

the step of detecting whether a response exists in the data pin of the memory card comprises the following steps:

and detecting whether the data pin of the memory card has data output in preset time.

5. The method of claim 2,

after the step of identifying the memory card as the first type of memory card, the method further comprises:

initializing a first type memory card by adopting an initialization command of a first type memory card communication protocol;

after the step of identifying the memory card as a second type of memory card, the method further comprises:

and initializing the second type memory card by adopting an initialization command of a second type memory card communication protocol.

6. The method of claim 1,

before the step of pulling down the potential of the command pin of the memory card to be identified, the method further comprises the following steps:

sending a reset command shared by a first type memory card communication protocol and a second type memory card communication protocol to a command pin of a memory card to be identified so as to enable the memory card to be identified to enter an idle state.

7. The method according to any one of claims 1 to 6,

the first type of memory card is an MMC card, and the second type of memory card is an SD card.

8. The method of claim 7,

the initialization command is a CMD1 command; and/or

The reset command is the CMD0 command.

9. The method of claim 1,

and powering on the memory card.

10. A mobile device, comprising a controller and a card holder capable of being embedded in a main body of the mobile device, wherein the card holder is provided with a card slot for accommodating a memory card and electrically connecting the memory card with the controller, and the controller is configured to identify the memory card by using the method according to any one of claims 1 to 9.