CN103944600A - Terminal based on ISM communication frequency band - Google Patents
Terminal based on ISM communication frequency band Download PDFInfo
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- CN103944600A CN103944600A CN201410156883.5A CN201410156883A CN103944600A CN 103944600 A CN103944600 A CN 103944600A CN 201410156883 A CN201410156883 A CN 201410156883A CN 103944600 A CN103944600 A CN 103944600A
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Abstract
The invention relates to a terminal based on an ISM communication frequency band. A CPU chip STM32F051R8T6, a FRAM chip MB85RS64, a FLASH chip 16Mbit, a DC-DC chip SPX3819, a liquid crystal screen, a keyboard and a buzzer are adopted for a base band part. A transceiving radio frequency chip A7108 is adopted for a radio frequency part, a communication control program is set for the CPU chip, the CPU chip is respectively communicated with the transceiving radio frequency chip, the FRAM chip and the FLASH chip through an SPI communication protocol and is respectively connected with the DC-DC chip, the liquid crystal screen, the keyboard and the buzzer. The terminal simplifies circuit complexity of a traditional radio frequency module and substantially lowers product cost. The total cost of the terminal only accounts for 10 percent that of an original radio frequency scheme, various technical indexes accord with standards, and communication quality is good.
Description
Technical field
The present invention relates to consumer commercial communication terminal, relate in particular to a kind of terminal based on ISM communications band.
Background technology
The terminal of ISM communications band is the wireless application based on the public frequency range of 433MHzISM.Be widely used in the fields such as food and beverage sevice intercom, wireless data communication, home automation and intelligent remote controller.ISM band is because of its common characteristic, and terminal development is particularly rapid.The technical threshold of terminal is low, and the market demand is large, and product cost is low, makes the favor of its producer that is subject to much communicating by letter.Present terminal on the market extensively adopts the radio-frequency module of standard.For example: between C8051F330 single-chip microcomputer and master cpu, communicate by letter.And control transmitting-receiving radio frequency chip ADF7020 comes reception and the emission process of settling signal.And carry out switching state by a T/R switch HMC544Ev.Finally deliver to antenna by power amplification circuit.This process circuit is more complicated, and software protocol is encapsulated in radio-frequency module single-chip microcomputer, externally maintains secrecy.Because this radio-frequency module price is higher, be unfavorable for the product market competition of current high-quality low price, therefore, urgent need will be developed a kind of terminal of novel ISM communications band.
Summary of the invention
The object of the invention is to design the terminal based on ISM communications band that a cost is lower, this end product need to redesign at hardware and software, to meet the demand of the high-quality low price of Vehicles Collected from Market to product.
The present invention for achieving the above object, the technical scheme of taking is: a kind of terminal based on ISM communications band, comprise baseband portion and radio frequency part, it is characterized in that: described baseband portion adopts cpu chip STM32F051R8T6, FRAM chip MB85RS64, FLASH chip AT25DF16, DC-DC chip SPX3819, liquid crystal display screen, keyboard and buzzer, radio frequency part adopts transmitting-receiving radio frequency chip A7108, wherein cpu chip STM32F051R8T6 is provided with communication control program, and by SPI communication protocol respectively with transmitting-receiving radio frequency chip A7108, FRAM chip MB85RS64 and FLASH chip AT25DF16 communicate connection, cpu chip STM32F051R8T6 respectively with DC-DC chip SPX3819, liquid crystal display screen, keyboard and buzzer connect.
Feature of the present invention and beneficial effect are: the design has simplified the circuit complexity of conventional radio frequency module, has significantly reduced product cost.The transmitting-receiving radio frequency chip A7108 that adopts radio frequency to upgrade, directly communicates by letter with middle control CPU.Integrated because of the height of A7108, T/R switch HMC544E and amplifying circuit can save.Add single-chip microcomputer and the peripheral circuit thereof of saving, the overall cost of the design is only 10% of former radio frequency scheme.And all technical meets standard, communication quality is good.
Brief description of the drawings
Fig. 1 is general structure block diagram of the present invention;
Fig. 2 is communication control program flow chart of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
With reference to Fig. 1, it is STM32F051R8T6 that baseband portion adopts cpu chip model, and FRAM chip (64K) model is MB85RS64, and FLASH chip (SPI) model is AT25DF16, DC-DC chip model is SPX3819, and liquid crystal display screen, keyboard and buzzer are the commercially available universal product.It is A7108 that radio frequency part adopts transmitting-receiving radio frequency chip model.
The baseband portion of terminal mainly realizes the processing of communication protocol, the demonstration of liquid crystal, the input of button, storage and the input method etc. of character library picture.Radio frequency part is to be communicated and be connected with baseband portion by SPI communication protocol.Mainly realize reception and the transmitting of radiofrequency signal, and complete modulation and demodulation.Terminal software part comprises the communication protocol that stand-alone development is write, comprising transceiving data agreement, and wireless communication protocol between net, the application of networking wireless encryption agreement etc. and MMI communication protocol and radio frequency chip protocol of encode and decode etc.
The function of each chip is as follows above:
1. adopt SPX3819 chip that the stable output of the DC3.7V power supply of lithium ion battery DC3.3V is powered to whole terminal.
2. adopt AT25DF16 Flash chip to be used for storing picture, character library, voice, picture, input method has been used for complete man-machine interface input and output.
3. adopt MB85RS64 chip to be used for preserving user profile and setting, prevent power-off loss.
4. adopt A7108 chip to be used for transmitting and receiving signal, and modulation and demodulation signal.This chip functions is powerful and stability is high, can reach the requirement of useful signal transmission range.
5. adopt STM32F051R8T6 chip as main control chip, complete the stable and operation efficiently of main system.In addition, this chip has also been realized Control on Communication between each chip, and the encoding and decoding of responsible agreement.
With reference to Fig. 2, the communication control program that cpu chip STM32F051R8T6 is provided with comprises following control step:
Step 1. starting key detects, and first judges whether the button time of pressing be greater than for 3 seconds, if be greater than for 3 seconds, thinks start; Otherwise do not process;
Step 2. start powers up, and carries out initialization, and initialization enters user's log-in interface later;
Step 3. adopt FRAM chip MB85RS64 to preserve user profile and setting, prevent power-off loss;
Step 4. input user name and password logs in judgement, if log in successfully, illustrate that handheld terminal can realize and the registration of base station, then enter the main interface of MMI; If failed return to wrong content, and return to user's log-in interface;
Different soft communication agreements represents form and the air interface of different messages.Therefore unmatched terminal is by registration failure.This has played software cryptography effect.
Step 5. user uses MMI interface, and realizes according to MMI interface operation the input information that user needs, and sends; According to the concrete purposes of terminal, the soft communication agreement that customization is answered in contrast.To be applied to food and beverage sevice intercom as example, can inquire about and upgrade feature list by MMI menu, such as vegetable table etc.; Can upload user's input information by MMI menu, such as menu etc.; Can pass through MMI menu receiving management software return information, such as bill etc.
Step 6. information sends to base station, and (base station refers in certain area of radio coverage, and between mobile telephone terminal, carries out the transceiving letter radio station of information transmission.), judge whether to receive base station receipt, if receive base station receipt, send successfully, and return to transmission successful information, EO; If do not receive base station receipt, send unsuccessfully, program inside is retransmitted.
The key technical indexes of the present invention:
Working temperature :-10 DEG C～+ 50 DEG C;
Frequency range: 433.05 – 434.79 MHz;
Peak power output: 10 ± 2dBm;
Frequency error :≤5 × 10
-8.
Claims (2)
1. the terminal based on ISM communications band, comprise baseband portion and radio frequency part, it is characterized in that: described baseband portion adopts cpu chip STM32F051R8T6, FRAM chip MB85RS64, FLASH chip AT25DF16, DC-DC chip SPX3819, liquid crystal display screen, keyboard and buzzer, radio frequency part adopts transmitting-receiving radio frequency chip A7108, wherein cpu chip STM32F051R8T6 is provided with communication control program, and by SPI communication protocol respectively with transmitting-receiving radio frequency chip A7108, FRAM chip MB85RS64 and FLASH chip AT25DF16 communicate connection, cpu chip STM32F051R8T6 respectively with DC-DC chip SPX3819, liquid crystal display screen, keyboard and buzzer connect.
2. a kind of terminal based on ISM communications band according to claim 1, is characterized in that: the communication control program that described cpu chip STM32F051R8T6 is provided with comprises following control step:
Step 1. starting key detects, and first judges whether the button time of pressing be greater than for 3 seconds, if be greater than for 3 seconds, thinks start; Otherwise do not process;
Step 2. start powers up, and carries out initialization, and initialization enters user's log-in interface later;
Step 3. adopt FRAM chip MB85RS64 to preserve user profile and setting, prevent power-off loss;
Step 4. input user name and password logs in judgement, if log in successfully, enter the main interface of MMI; If failed return to wrong content, and return to user's log-in interface;
Step 5. user uses MMI interface, and realizes according to MMI interface operation the input information that user needs, and sends;
Step 6. information sends to base station, judges whether to receive base station receipt, if receive base station receipt, sends successfully, and returns to transmission successful information, EO; If do not receive base station receipt, send unsuccessfully, program inside is retransmitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410156883.5A CN103944600A (en) | 2014-04-18 | 2014-04-18 | Terminal based on ISM communication frequency band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410156883.5A CN103944600A (en) | 2014-04-18 | 2014-04-18 | Terminal based on ISM communication frequency band |
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| CN103944600A true CN103944600A (en) | 2014-07-23 |
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| CN201410156883.5A Pending CN103944600A (en) | 2014-04-18 | 2014-04-18 | Terminal based on ISM communication frequency band |
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Citations (7)
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| CN1964471A (en) * | 2006-01-05 | 2007-05-16 | 宁波大学 | 2.4G public frequency band digital visual interphone and method to process audio image |
| CN102572614A (en) * | 2010-12-31 | 2012-07-11 | 上海可鲁系统软件有限公司 | Walkie-talkie remote communication method and walkie-talkie |
| CN102843386A (en) * | 2011-05-30 | 2012-12-26 | 上海励谙电子技术有限公司 | Radio frequency communication module for fault indicator of power distribution network line and applications of radio frequency communication module |
| CN103079118A (en) * | 2013-01-18 | 2013-05-01 | 复旦大学无锡研究院 | Multi-function field interphone |
| CN103138796A (en) * | 2013-03-04 | 2013-06-05 | 福建省万华电子科技有限公司 | Data management routine (DMR) digital interphone supporting relaying and forwarding of identical and different frequencies |
| CN203352572U (en) * | 2013-07-02 | 2013-12-18 | 泉州福顺达通讯科技有限公司 | Novel digital interphone |
| CN203482187U (en) * | 2013-08-07 | 2014-03-12 | 珠海中慧微电子有限公司 | A universal micropower wireless communication module |
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2014
- 2014-04-18 CN CN201410156883.5A patent/CN103944600A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1964471A (en) * | 2006-01-05 | 2007-05-16 | 宁波大学 | 2.4G public frequency band digital visual interphone and method to process audio image |
| CN102572614A (en) * | 2010-12-31 | 2012-07-11 | 上海可鲁系统软件有限公司 | Walkie-talkie remote communication method and walkie-talkie |
| CN102843386A (en) * | 2011-05-30 | 2012-12-26 | 上海励谙电子技术有限公司 | Radio frequency communication module for fault indicator of power distribution network line and applications of radio frequency communication module |
| CN103079118A (en) * | 2013-01-18 | 2013-05-01 | 复旦大学无锡研究院 | Multi-function field interphone |
| CN103138796A (en) * | 2013-03-04 | 2013-06-05 | 福建省万华电子科技有限公司 | Data management routine (DMR) digital interphone supporting relaying and forwarding of identical and different frequencies |
| CN203352572U (en) * | 2013-07-02 | 2013-12-18 | 泉州福顺达通讯科技有限公司 | Novel digital interphone |
| CN203482187U (en) * | 2013-08-07 | 2014-03-12 | 珠海中慧微电子有限公司 | A universal micropower wireless communication module |
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Application publication date: 20140723 |