UM0897 Datasheet, PDF (8/25 Pages) STMicroelectronics – Embedded Ethernet web client based on the STR91x

System overview
2
System overview
UM0897
2.1
Server client general description
The system is based on the web server-client relationship as shown in Figure 5. The web
server system connects to the network by opening up a connection and listening on it. Any
web client system can connect to that port on which the server is listening. This web server
can be dedicated for any application. For example, it may be taking data from a camera or it
may have images already saved in it or also in industrial applications, process control
information can be available on the Ethernet network.This information can be taken by the
web client and displayed on the TFT display available on the board.
Figure 5. Server-client relationship
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2.2
System architecture description
The system works as a web client on the STR9 microcontroller. The system can work with
web servers capable of providing jpeg images. The system accesses jpeg images from the
web server and displays them on the TFT for viewing/monitoring.
The system can request images from all web servers which don't provide support for secure
socket layer communication (SSL). These images are saved on a micro-SD card from where
they are decoded and displayed on the TFT through a jpeg decompression algorithm. The
system is capable of saving IP addresses of the web servers in non-volatile memory. The
user can change these addresses using the keypad.
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Doc ID 17012 Rev 1