V850 WebServer, Software, User`s Manual
Contents
1. lt HTML gt lt HEAD gt lt META HTTP EQUIV refresh CONTENT 0 URL index ssi gt lt HEAD gt lt HTML gt That means that the browser requests the index ssi again SSI function Server Side Includes are actually plug ins that are executed on the target prior to the completion of a GET operation The Web Browser sends a request to the Web Server in the form of a URL The Web Server detects the SSI extension on the request It then searches the requested file for the unique lt comment string When found the function specified by the string following the special comment symbol is generally passed some parameters not necessary and executed The result is generally HTML output This capability permits the inclusion of dynamic data controlled by the target in an HTML file The following SSI plug ins are used in the demonstration application lt ad_value chn 0 0 1023 0 2 5 2 gt lt digin_value chin 2 low high gt User s Manual ICP V850 I2SE SW 7 Chapter 2 Product Functions lt INPUT TYPE radio NAME RADIOA0 VALUE HIGH lt digin_value chout 0 CHECKED gt gt lt INPUT TYPE radio NAME RADIOA0 VALUE LOW lt digin_ value chout 0 CHECKED gt gt lt save fs state gt The ad_value function supplies the analog value of one AD converter channel The first parameter is the number of the channel 0 7 The next 4 parameters are for the linear interpolation and the last parameter d2. 9 2 10 Construction of the file SERVER INI cece a a ea aa 10 2 11 Demonstration program V850E_ WED C ccccccsesecceeeseeeceeeeeaeeeeeeseeeeseeeesseaeeceeeessaeeseeeesseaeeeeesaaaess 10 2 User s Manual ICP V850 I2SE SW Chapter 1 Introduction 1 Introduction 1 1 Embedded Systems and the Internet In recent years the Internet has become a more and more important instrument for communication It is built on standard protocols defined over the last 30 years so that now any computer can be connected to the World Wide Web Currently most computers with Internet access are PCs running large operating systems Now however with the entry of embedded systems into the Internet world there has become a definite requirement for solutions without the traditional overheads of PC connectivity 1 2 Remote Access Applications Internet connected embedded systems have become key to remote access applications Up to now remote access applications have been based on high cost inflexible proprietary solutions to provide the communications protocol between a remote location and the embedded system the embedded system software the graphical user interface at the remote location If it were possible to use the standard TCP IP and additional protocols used in the Internet development costs for remote access solutions would be dramatically reduced the communications protocols are standard PPP Ethernet TCP IP UDP HTTP FT
3. a distinguishing extension Ssi by default are scanned by the server while copying them to the client for special embedded escape strings When the special string is found a corresponding user supplied server plug in routine is called which sends some output into the data stream being sent to the client The net effect of this is to insert dynamic generated on the fly page content by using a static HTML page This feature is usually used to insert some changing piece of system information time of day date etc into an otherwise static web page The SSI mechanism is used to include information about the analog and digital inputs This information is synchronised with the scaling information in the HTML site In this way it is possible to write the value of the ADC as a real physical value With the WebServer demonstration board a standard HTML administration page is also delivered index ssi The function of this page is to administrate the web server to set and clear the digital output ports and to start the data logger function Usage of the HTTP server An Ethernet or PPP connection must first be set up between the V850E server and your PC You can check the connection with the PING command PING 192 168 200 1 for default PPP connection PING 192 168 200 2 for default Ethernet connection The name for the PPP connection is NEC and the password is V850 Please input these strings before starting the PPP connection The baud
4. pressed the application initializes the file system and writes the files that are necessary for proper operation of the WebServer If the file system in the RAM was changed by the user the file system in the flash ROM can be copied by pressing a button on an HIML page 2 8 Operation of the data logger The data logger has the task to read in the values of the analog input ports in a fixed time period and to store these data in the file DATA LOG The time period is committed to 10 seconds The data logger function can be started via an HTML page The function stops if the file is filled up The format of the data is ASCII So a read in into Excel is easy possible The file transfer will be made via file transfer protocol FTP 2 9 Interfaces to the hardware The hardware interfaces are used in the following manner 8 digital inputs ports 4 digital outputs ports 8 analog inputs ports A serial interface is reserved for communication with the modem A second serial interface is used to debug the system For the function of the demo application it does not have any importance User s Manual ICP V850 I2SE SW 9 Chapter 2 Product Functions 2 10 Construction of the file SERVER INI The file SERVER INI includes all information on the configuration of the server and the application The format of configuration file is ASCII allowing editing within any text editor Determine the IP addresses of the web server PPP IP 192 168 200 1 E
5. rate for PPP is 19200bps If the PING works properly you can start your browser and type http 192 168 200 1 or http 192 168 200 2 6 User s Manual ICP V850 I2SE SW Chapter 2 Product Functions The server sends the index htm to the client The default contents of the index htm is lt HTML gt lt HEAD gt lt META HTTP EQUIV Refresh CONTENT 0 URL index ssi gt lt HEAD gt lt HTML gt This is a meta tag requests the server to send the file index ssi HTML file index ssi In this section we describe only the lines of the HTML file index ssi that are not part of the default HTML lt FORM ACTION post_demo METHOD post gt This tag defines the interface function for all post operations The name of this function is post_demo The registration of this function as a server plug in is part of web server software Post function The post_demo function scans all names of HTML user action tags The following names are supported SETIO Set of the state of the 4 digital outputs STARTDL Start of the data logger SAVE Copies the In memory file system into the flash area The type of all these input tags has to be submit lt INPUT TYPE submit NAME SETIO VALUE Set Ports gt lt INPUT TYPE submit NAME STARTDL VALUE Start Data Logger gt lt INPUT TYPE submit NAME SAVE VALUE Save Filesystem gt At the end of the post function the server sends the following meta tag to the browser
6. P the graphical user interface is available on every PC without costs a standard Internet Browser e g Netscape Communicator or Microsoft Internet Explorer So it has become necessary to provide a communication software solution for microcontrollers which supports the protocols mentioned above 1 3 Embedded Web Server To fit these demands a Web server has to become Embedded An Embedded Web Server works with minimal resource requirements handles the protocols and provides the low level functions required to access the hardware The product described in this documentation is a hardware and software reference design to demonstrate the NEC V850E family of microcontrollers as a platform for Embedded Web Server technology User s Manual ICP V850 I2SE SW 3 Chapter 2 Product Functions 2 Product Functions 2 1 Destinations of the implementation The Web Server software makes it easy to demonstrate the V850E in an Internet Intranet context With limited Knowledge of HTML language it is also possible to create custom web pages providing a tailored demonstration platform specific to the needs of individual companies An example data logging function and the possibility for sending e mail complete the function scope 2 2 Software components The software provided with the Evaluation Kit is based on a real time operating system and Internet software For the purposes of instruction within this document Evaluation software functi
7. User s Manual V850 WebServer Embedded Web Server Technology Demonstration Kit Software Document No U15888EE1VOUMO0O0 Date published October 2001 NEC Corporation 2001 I2SE GmbH 2001 Printed in Germany Table of Contents Mis MOda MOM cee suse Moreton aay dele cr dads tei nese eee ass Wises E E EEE 3 1 1 Embedded Systems and the Interne tii csei hncecsetivceded siete Mates locticteds Shaun tied eel ie eee 3 Tees cACMOTESACCESS ADDIICAUONS nnns a a a a a a 3 To Embedded Web SEVEN serana ee a E a a a E E 3 2 PrOdUCI FUNCIONS verrerie a ra aa A 4 2 1 Destinations of the implementation cccccescccceseeecseseeeccesececseeuseeecsuseeecsaueeeeseueeeeseuseeesssaueeesageees 4 2 23 SOM ALS COMPONEN S ears aa A a eee eee taeda 4 2 3 Structure ofthe software components criias aaa poled akana a aani aiaia 5 2 4 Summary of demonstration software functions cccccccccceeeeceeceeeeeceeeeeeeeeceeeeeeaeeeeessseaseeeeeesseaeeeees 6 2500 LAKE SCI Cl siysuaataibdiweubiaaudn cat E E wiadioba enone Syamn iietuctaviand 6 A Rm sal BL ca 1 AVS Greene eee ane me een a Ae oe ee 8 2 7 The mode of operation of the file system cccccccccsssesececceeeeeeeeceeeeeeeseeauseeeesaeaaeeeesssaaseeeeessaaeeeess 9 2 6 Operation or the datalogger s rann a ne eee aaa 9 2 9 Interfaces to the hardware ccccccsesececneeeeeeeeeeeeecseeeeesseueeeeeseeeceeseeeeeesaaeeeessaeeeesseeeesseeeeessaeeeessaeess
8. etermines the number of decimals lt ad_value chn 0 0 1023 0 2 5 2 gt Yih ok LP he ie 2 decimals he te 2 5 value that corresponds with 1023 O value that corresponds with 0O 1023 second value of the ADC for interpolation O first value of the ADC for interpolation O number of the ADC channel In this example the HTML site shows values from 0 00 to 2 50 The resolution of the ADC is 10 bit For the interpolation only positive values are allowed The digin_value function supplies one string in the case of a low level and another string in the case of a high level of a digital port The input ports are queried with chin and the output port with chout The first parameter is the number of the channel 0 7 lt digin_ value chin 2 low high gt In this example the HTML site shows low in case of low level and high in case of a high level on channel 2 The following examples are special applications of the digin_value function lt INPUT TYPE radio NAME RADIOA0 VALUE HIGH lt digin_ value chout 0 CHECKED gt gt lt INPUT TYPE radio NAME RADIOA0 VALUE LOW lt digin_ value chout 0 CHECKED gt gt The SSI function completes the tags for radio buttons corresponding to the actual value of a digital output port The number of the port can be 0 3 In one case the function supplies a blank and in the other case CHECKED for a checked radio button The save_fs_state f
9. ons are based on the Nucleus Plus RTOS from Accelerated Technologies Inc www acceleratedtechnology com which has been proven to run with WebServer Details are also provided for running the WebServer Demonstration Kit alone Nucleus Plus Operating System Nucleus NET TCP IP Stack Nucleus Webserv HT TP Server Nucleus EMAIL SMTP Client Nucleus FAL File Abstraction Layer Nucleus Extended Protocol Package FTP Server PPP Point to Point Protocol and the drivers for the serial interface and the Ethernet controller are further components available royalty free from ATI The source code provided with the Web Server Evaluation Kit is an example built with a modified In memory file system 4 User s Manual ICP V850 I2SE SW Chapter 2 Product Functions 2 3 Structure of the software components The software components of the WebServer are implemented in the internal flash of the V850E Only parameter files and the HTML files are stored in the file system The software structure consists of the components represented in the following diagram Green signifies components supplied within Nucleus Plus and blue represents the demonstration software The demonstration works with a PPP connection Modem and with an Ethernet connection It is possible to use both interfaces at the same time User s Manual ICP V850 I2SE SW 5 Chapter 2 Product Functions 2 4 Summary of demonstration software functions Initialization of I Os inte
10. rrupt table RAM disk after reset cyclical read of all analog an digital inputs start of data logging on a HTML request display of all analog and digital input values on HTML sites set of the digital output ports corresponding to inputs on HTML sites management of the disk copy function between RAM disk and flash ROM disk 2 5 HTTP server The HTTP server forms the interface between the HTML files stored in the file system and the TCP IP stack Nucleus WebServ receives a request from a web browser The request is decoded and information is returned to the client Returned information is normally static HyperText Mark up Language HTML files The application program executing with the HTTP server may also dynamically generate information that can be sent to the client This program is typically called a server side plug in or server script The client can also accept data from the user through HTML functions buttons text boxes etc and pass it to the server plug in programs Since HTML is a simple to use text formatting language the embedded plug in can accept the data from the user and compose an HTML formatted reply and respond to the user in the familiar web interface The server side include SSI mechanism is a special case plug in and an easy way to make web pages with dynamic content The Nucleus WebServ normally does the job of serving a file by copying that file to the network socket interface connected to the client Files with
11. thernet IP 192 168 200 2 Determine the subnet mask Subnet 255 255 255 0 To reset the SERVER INI into the reset state hold down the init button while turning the power on The init button is the only button present on the credit card sized server board 2 11 Demonstration program V850E_web c The V850E_web c file contains all functions of the demonstration software For memory access of the eeprom and the external flash memory two additional modules are available Flash c Access to the external 1 Mbytes flash memory Eeprom c Access to the Ethernet controller e2prom 93C46 Summary of the functions in the V850E_web c module 10 User s Manual ICP V850 I2SE SW
12. unction supplies the string saved or not saved corresponding to the file system Press the Save file system button to see the difference lt save fs state gt 2 6 FTP server The FTP server is used for receiving files from one client and storing files in the file system as well as sending files on request With the In memory file system the following FTP functions are possible to use 8 User s Manual ICP V850 I2SE SW Chapter 2 Product Functions Dir Put file name Get file name Del file name Bye Use of the FTP function running in a DOS window is recommended Example for starting the FTP client C work_dir gt FTP 192 168 200 1 lt CR gt FTP gt It is not necessary to input a username or password You can now work in terminal mode 2 The mode of operation of the file system The Nucleus Plus In Memory File System consists of 2 layers The lower layer manages the memory IC as a file system The upper layer the file abstraction layer sets up the connection between the file system and all other software components The Nucleus Plus file system uses RAM as storage The number of files within in the file system will be fixed at the time of compilation 8 files with 16 Kbyte filesize Only one directory is supported When initialised the application copies the file system from the Flash ROM into the RAM If there is no valid file system in the flash ROM or the INIT button is
Download Pdf Manuals
Related Search