CN201628975U - IIC memory card read-write device with SPI interface - Google Patents
IIC memory card read-write device with SPI interface Download PDFInfo
- Publication number
- CN201628975U CN201628975U CN2009202819712U CN200920281971U CN201628975U CN 201628975 U CN201628975 U CN 201628975U CN 2009202819712 U CN2009202819712 U CN 2009202819712U CN 200920281971 U CN200920281971 U CN 200920281971U CN 201628975 U CN201628975 U CN 201628975U
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- interface
- spi
- iic
- memory card
- card reader
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- 239000013078 crystal Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The utility model provides an IIC memory card read-write device with an SPI interface. The device comprises a power supply, a crystal oscillator, an LED indicator lamp, the SPI interface, a processor (MCU) and a memory card reader with an IIC interface, wherein the power supply, the crystal oscillator, the LED indicator lamp, the SPI interface and the memory card reader with the IIC interface are connected with the MCU through data lines, so that the operations on the memory card reader with the IIC interface can be realized through the communication between the SPI interface and a processor (CPU) of equipment; the memory card reader with the IIC interface and the MCU serve as an SPI slave computer and an SPI host computer respectively; the memory card reader with the IIC interface is connected with the MCU through an SPI bus to realize SPI communication; and the MCU is used for receiving data sent by the CPU of the equipment through the communication interface connection between the SPI interface and the CPU, resolving commands and parameters for operating an IIC card according to a pre-agreed format, and converting the commands and parameters into the IIC protocol format for corresponding operations on a memory card on the IIC interface.
Description
Technical field
The utility model relates to a kind of tax controlling equipment, specifically a kind of IIC memory card read/write device with the SPI interface.
Background technology
The card reader majority is communicated by letter with miscellaneous equipment as interface with serial ports or USB at present.
In system, serial port resource is limited, but is to use very frequently, and a lot of devices and peripheral hardware use serial ports and devices communicating, and this has just caused the in short supply of serial port resource.Frequent switching serial equipment not only causes damage but also the exploitation of influence or the efficient of use of interface easily.
USB interface does not have integrated in some middle and high shelves CPU, need add the USB chip if want to realize usb communication, and in internal system, usb communication is seldom adopted in communicating by letter of CPU and other components and parts.
In addition, portion C PU does not have the IIC communication interface, and its GPIO can not be arranged to the transmitted in both directions pattern of input and output, can not Simulation with I IC communication, components and parts that therefore can not direct control IIC interface.
Summary of the invention
A kind of IIC memory card read/write device with the SPI interface of the present utility model is realized in the following manner, its structure is made up of power supply, crystal oscillator, LED light, SPI interface, processor MCU and IIC interface memory card card reader, power supply, crystal oscillator, LED light, SPI interface and IIC interface memory card card reader are connected with processor MCU by data line, utilize the SPI interface and processor CPU communicate to connect, realization is operated being connected on the IIC interface memory card card reader storage card, wherein
IIC interface memory card card reader is set to the SPI slave, processor MCU is set to the SPI main frame, IIC interface memory card card reader is connected to processor MCU by spi bus, realize SPI communication, the function of processor MCU is to be connected with the processor CPU communication interface of equipment by the SPI interface, the data that receiving processor MCU sends, and the order and the parameter that go out to operate IC-card according to the format analysis of appointing in advance, the protocol format that converts IIC then to is operated accordingly to the storage card on the IIC interface.
Excellent effect of the present invention is: overcome the deficiency that prior art exists, develop a kind of card reader of read-write IIC storage card that can external SPI interface that again can be built-in, to save serial port resource, the unmatched problem of solution interface.
Description of drawings
Fig. 1 is the circuit theory diagrams of card reader.
Embodiment:
Below in conjunction with the drawings and specific embodiments the utility model is described further:
A kind of IIC memory card read/write device with the SPI interface as shown in Figure 1, comprises power supply, crystal oscillator, and LED light, the SPI interface, processor and IIC interface memory card card reader are formed.Described card reader utilizes the SPI interface to communicate by letter with the CPU of equipment, realizes the operation to IC-card.Card reader is set to the SPI slave, and the CPU of described equipment is set to the SPI main frame, and card reader is connected to the CPU of equipment by spi bus, realizes SPI communication.
Processor is middle-grade or low-grade MCU, can communicate by letter with IIC interface realization SPI by the SPI interface that carries and communicate by letter with IIC, maybe can simulate SPI interface or IIC interface realization SPI communication or IIC communication by GPIO.The function of processor is to communicate by letter with the CPU of equipment by the SPI interface, receive the data that CPU sends, and the order and the parameter that go out to operate IC-card according to the format analysis of appointing in advance, the protocol format that converts IIC then to is operated accordingly to the storage card of IIC interface.
Processor MCU realizes communicating by letter with SPI by the SPI interface that carries and IIC interface and communicates by letter with IIC, or simulates the SPI interface or the realization of IIC interface is communicated by letter with SPI or IIC communicates by letter by GPIO.
LED is the card reader relay indicating light, and when card reader was worked, LED is luminous to be produced and maintenance with convenient.
Embodiment
Card reader of the present utility model is by power supply, crystal oscillator, and LED light, the SPI interface, processor and IIC interface memory card card reader are formed.
Typical embodiment of the present utility model is that system is built-in.SPI interface among the figure directly is connected with the SPI interface of CPU, can realize that the communication of many slaves of single host communicates by letter with single host list slave.The CS of SPI can omit and not connect when being configured to the communication of single host list slave.When adopting external mode, system will reserve the SPI interface.
After processor receives the data that the SPI main frame sends, according to data layout resolve command and the parameter appointed with main frame, so, require when the program of exploitation CPU, will cooperate with card reader and carry out.In addition, the basic communication agreement of SPI and IIC is all fairly simple, has just repeated no more here.
During this card reader is utilized, low-grade MCU is as processor, realized the conversion of SPI agreement and IIC agreement, solved the unmatched problem of interface, saved serial port resource, it is low to have a cost, portable strong advantage.
Claims (3)
1. IIC memory card read/write device with the SPI interface, it is characterized in that, comprise power supply, crystal oscillator, LED light, SPI interface, processor MCU and IIC interface memory card card reader, power supply, crystal oscillator, LED light, SPI interface and IIC interface memory card card reader are connected with processor MCU by data line, utilize the SPI interface to communicate by letter with processor CPU, realization is to the operation of IIC interface memory card card reader, wherein:
IIC interface memory card card reader is set to the SPI slave, and processor MCU is set to the SPI main frame, and IIC interface memory card card reader is connected to processor MCU by spi bus, realizes SPI communication.
2. card reader according to claim 1 is characterized in that, processor MCU realizes communicating by letter with SPI by the SPI interface that carries and IIC interface and communicates by letter with IIC, or simulates the SPI interface or the realization of IIC interface is communicated by letter with SPI or IIC communicates by letter by GPIO.
3. card reader according to claim 1 is characterized in that, LED is the card reader relay indicating light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202819712U CN201628975U (en) | 2009-11-30 | 2009-11-30 | IIC memory card read-write device with SPI interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202819712U CN201628975U (en) | 2009-11-30 | 2009-11-30 | IIC memory card read-write device with SPI interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201628975U true CN201628975U (en) | 2010-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202819712U Expired - Fee Related CN201628975U (en) | 2009-11-30 | 2009-11-30 | IIC memory card read-write device with SPI interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201628975U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142093A (en) * | 2011-03-24 | 2011-08-03 | 青岛海信移动通信技术股份有限公司 | Operation method and device for memory card |
-
2009
- 2009-11-30 CN CN2009202819712U patent/CN201628975U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142093A (en) * | 2011-03-24 | 2011-08-03 | 青岛海信移动通信技术股份有限公司 | Operation method and device for memory card |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101110 Termination date: 20121130 |