Casio EG-800U - Cassiopeia - Win CE 3.0 150 MHz- Manuals

SLAA137A MSP430 Internet Connectivity 5 Every network node has its own unique physical address. It is 48 bits long and called the media access control (MAC) address. The maximum length possible for an Ethernet frame is 1518 bytes. This size covers the whole frame, excluding the preamble. The preambl...

SLAA137A 6 MSP430 Internet Connectivity 2.4 Internet Control Message Protocol The internet control message protocol (ICMP) provides a mechanism for reporting problems and generating diagnostic messages, e.g., when a datagram cannot reach its des tination, when a gateway does not have the buffering c...

SLAA137A MSP430 Internet Connectivity 7 2.6 Hypertext Transfer Protocol The hypertext transfer protocol (HTTP) is an application level protocol. It is a generic, stateless, object oriented protocol that can be used for many tasks, such as name servers and distributed object management systems, throu...

SLAA137A 8 MSP430 Internet Connectivity MSP430F149 CS8900A D[7..0] A[3..0] IOR I O W Isolation Transformer RJ45 Connector LEDs: Power, Link, LAN 20 MHz 8 MHz JTAG Figure 3. Hardware Block Diagram 3.1 Interfacing to the LAN Controller The most interesting thing is the connection between the LAN contr...

SLAA137A MSP430 Internet Connectivity 9 3.2 Circuit Description The analog circuitry around the CS8900A is built as further described in Resource [8]. A 20-MHz crystal is connected between the pins XTAL1 (pin 97) and XTAL2 (pin 98) of the CS8900A. Because of the built-in loading capacitance on the X...

SLAA137A 10 MSP430 Internet Connectivity Figure 4. Prototype Board With Components Installed Appendix A shows the schematic and Appendix B provides a list of components that are needed to build the module. For each of the discrete parts, there are several manufacturers available. 3.3 Connection to t...

SLAA137A MSP430 Internet Connectivity 11 4 Software Description This chapter describes the implemented TCP/IP stack, the ethernet driver, and the HTTP server. The entire software is written in C and therefore porting to other MCU systems should be quite easy. For reasons of better understanding, the...

SLAA137A 12 MSP430 Internet Connectivity Table 4. Functions of the Ethernet Module Name, Parameters Description void Init8900(void) Initializes important MCU port pins, does a software reset of the LAN controller, and sets up the LAN controller MAC interface. void Write8900(unsigned char Address, un...

SLAA137A MSP430 Internet Connectivity 13 Init8900() User Program Write8900(ADD_PORT, PP_RxEvent) (Read8900(DATA_PORT) & RX_OK)? CopyFromFrame8900(...) Application Wants to Send Data? RequestSend(FrameSize) Rdy4Tx()? RequestSend(FrameSize) Yes No No Yes Yes No Figure 5. Using the Ethernet Module ...

SLAA137A 14 MSP430 Internet Connectivity • A time-out is exceeded • An error occurs (network error, connection is reset by the opponent) The software implements the essential parts of the standards RFC 791, 792 and 793. The most important function of this stack is DoNetworkStuff(). This function mus...

SLAA137A MSP430 Internet Connectivity 15 4.2.1 Buffer Memory To work with incoming and outgoing frames, three memory buffers are reserved in the MCU SRAM. The size of these buffers can be adapted by changing the appropriate symbolic constants in tcpip.h. Increasing the size of the buffers leads to a...

SLAA137A 16 MSP430 Internet Connectivity Frame Was Received. Individually Addressed? Broadcast? ARP, Opcode REPLY? IP? Process Frame. ICMP? TCP? ProcessICMPFrame() ProcessTCPFrame() Figure 8. Demultiplexing of Received Frames If the frame was individually addressed, it is first checked to determine ...

SLAA137A MSP430 Internet Connectivity 17 To prevent the receive buffer from corruption while receiving data, a handshake mechanism is implemented. This mechanism uses the SOCK_DATA_AVAILABLE flag of the SocketStatus register. The TCP stack only copies data to RxTCPBuffer if the SOCK_DATA_ AVAILABLE ...

SLAA137A 18 MSP430 Internet Connectivity 4.2.6 Closing a Connection A TCP connection can be closed on different events. Normally this is done either locally by calling the user function TCPClose() or remotely by the other TCP. During the termination of a connection, segments carrying FIN flags are e...

SLAA137A MSP430 Internet Connectivity 19 Table 5. Compatible Communication Systems Computer System / CPU Operating System, TCP/IP Stack PC / Athlon™/ 1 GHz Windows 2000 PC / Athlon / 1 GHz Linux, kernel v 2.2.16 PC / Pentium™ / 233 MHz Windows 98 PC / 486DX2 / 66 MHz Windows 95 Apple™ Macintosh™ / 6...

SLAA137A 20 MSP430 Internet Connectivity Very important for the proper function of the stack is the periodic calling of the function DoNetworkStuff() by the application. A typical program flow chart using this TCP/IP API is shown in Figure 9. DoNetworkStuff() Open or Close Connection Process Incomin...

SLAA137A MSP430 Internet Connectivity 21 4.3.1 Functions void TCPLowLevelInit(void) This function does a basic setup of the ethernet controller and numerous variables; it also configures ports and timer_A of MSP430. It must be called before any data transmission via TCP/IP can take place. void TCPPa...

SLAA137A 22 MSP430 Internet Connectivity void TCPClose(void) Use this API function to close an open connection. Before disconnecting, the stack ensures that a packet that still resides in the output buffer is transmitted and acknowledged properly. After closing, the application may reconfigure IP ad...

SLAA137A MSP430 Internet Connectivity 23 Bit 7 SOCK_ ERROR Bit 6 SOCK_ERROR Bit 5 SOCK_ERROR Bit 4 SOCK_ERROR Bit 3 SOCK_TX_BUF_ RELEASED Bit 2 SOCK_DATA_ AVAILABLE Bit 1 SOCK_ CONNECTED Bit 0 SOCK_ACTIVE Figure 11. SocketStatus Register SOCK_ACTIVE (Bit 0) This flag is set when the TCP is busy open...

SLAA137A 24 MSP430 Internet Connectivity SOCK_TX_BUF_RELEASED (Bit 3) This flag indicates whether the application can change the contents of the transmit buffer or modify the TCPTxDataCount variable. This flag is set by the stack if the previous packet sent was acknowledged properly. This realizes a...

SLAA137A MSP430 Internet Connectivity 25 SOCK_ACTIVE? Yes No TCPPassiveOpen() TCPLowLevelInit() Initialize HTTP Server's Flag-Register TCPLocalPort = TCP_PORT_HTTP Initalizing of Clock System Configure MCU's I/O Ports DoNetworkStuff() HTTPServer() Figure 13. Web Server Main Module

SLAA137A 26 MSP430 Internet Connectivity After initializing some hardware and the stack itself, the local TCP port is set to 80 (default for an HTTP server). The server is now waiting for a client to be connected. During the first jump to HTTPServer() after connecting, the flag HTTP_SEND_PAGE in reg...

SLAA137A 28 MSP430 Internet Connectivity By using the REFRESH statement in the HEAD section of the page’s source code, an Internet browser c an be advised to reload the page after a specified timeout period. In the demonstration HTTP server, the page is reloaded each five seconds. The HTML code show...

SLAA137A MSP430 Internet Connectivity 29 5 References 1. TCP/IP Running a Successful Network by Washburn, K., Evans, J. Addison Wesley, 1996 2. Internet Protocol (IP) by Postel, J., RFC 791† 3. Internet Control Message Protocol by Postel, J., RFC 792† 4. Transmission Control Protocol by Postel, J., ...

SLAA137A 30 MSP430 Internet Connectivity Appendix A. Application Schematic

SLAA137A MSP430 Internet Connectivity 31 Appendix B. Parts List Part Name Value / Description Package C1 560 pF SMT 0805 C2, C3, C6, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22 0.1 µF (100n) SMT 0805 C4, C5 15 pF SMT 0805 C24, C25 4700 pF / 2 kV (4n7) D1 LED red, 3 mm, 2 mA (rt) D2 LED yellow, ...

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