main.cpp

00001 /*------------------------------------------------------------------------------------*/
00002 /*  Ethernet UDP Server (to be used with Ethernet_UDP_client)                         */
00003 /*------------------------------------------------------------------------------------*/
00004 
00005 /*--COMPANY-----AUTHOR------DATE------------REVISION----NOTES-------------------------*/
00006 /*  NXP         mareikeFSL  2015.12.23      rev 1.0     initial                       */
00007 /*                                                                                    */
00008 /*------------------------------------------------------------------------------------*/
00009 /*  This "Hello World" program is used in conjunction with the Ethernet_UDP_client    */
00010 /*  program. It communicates between two FRDM-K64F boards via the Ethernet protocol.  */
00011 /*  To use this program, you need to do the following:                                */
00012 /*      - Connect an Ethernet cable between two FRDM-K64F boards (a crossover cable   */
00013 /*        is not required).                                                           */
00014 /*      - Flash one board with Ethernet_UDP_client and the other with                 */
00015 /*        Ethernet_UDP_server                                                         */
00016 /*      - [optional] If you would like to see the "Hello World" output on your        */
00017 /*        monitor, install and open a terminal. Tera Term is used in the Wiki for     */
00018 /*        this program.                                                               */
00019 /*------------------------------------------------------------------------------------*/
00020 
00021 
00022 /*--INCLUDES----------------------------------------------------------------------------*/
00023 #include "mbed.h"
00024 #include "EthernetInterface.h"
00025  
00026 
00027 /*--DEFINES-----------------------------------------------------------------------------*/
00028 
00029 
00030 
00031 /*--CONSTANTS---------------------------------------------------------------------------*/
00032 const int PORT = 7;                             //arbitrary port
00033 
00034 static const char* SERVER_IP = "192.168.1.101"; //IP of server board
00035 static const char* MASK = "255.255.255.0";      //mask
00036 static const char* GATEWAY = "192.168.1.1";     //gateway
00037 
00038 
00039 /*--INITS-------------------------------------------------------------------------------*/
00040 Serial pc(USBTX, USBRX);        //create PC interface
00041 EthernetInterface eth;          //create ethernet
00042 UDPSocket server;               //creat server
00043 Endpoint client;                //create endpoint
00044 
00045 DigitalOut red(LED_RED);        //debug led
00046 DigitalOut green(LED_GREEN);    //debug led
00047 
00048 
00049 /*--VARIABLES---------------------------------------------------------------------------*/
00050 int n;                  //size of received message
00051 char counter[1] = {0};  //sample receive/send buffer
00052 
00053 
00054 /*--FUNCTION DECLARATIONS---------------------------------------------------------------*/
00055 void init_usb(void);    //initializes pc.printf if required
00056 void init_eth(void);    //initializes Ethernet
00057 void receive(void);     //receives packets
00058 int main(void);         //main
00059 
00060 
00061 /*--FUNCTION DEFINITIONS----------------------------------------------------------------*/
00062 
00063 /*****************************************************************************INIT_USB***/
00064 void init_usb(void)
00065 {
00066     pc.baud(9600);    //baud
00067     
00068 }   //end init_usb()
00069 
00070 /*****************************************************************************INIT_ETH***/
00071 void init_eth(void)
00072 {
00073     eth.init(SERVER_IP, MASK, GATEWAY);                                         //set up IP
00074     eth.connect();                                                              //connect ethernet
00075     pc.printf("\nSERVER - Server IP Address is %s\r\n", eth.getIPAddress());    //get server IP address;
00076     
00077     server.bind(PORT);                                                          //bind server
00078         
00079 }   //end init_eth()
00080 
00081 /******************************************************************************RECEIVE***/
00082 void receive(void)
00083 {
00084     pc.printf("\nSERVER - Waiting for UDP packet...\r\n");                                      //wait for packet
00085     n = server.receiveFrom(client, counter, sizeof(counter));                                   //receive message from client
00086     counter[n] = '\0';                                                                          //add \0 to end of message
00087     
00088     pc.printf("SERVER - Received '%i' from client %s\r\n", counter[0], client.get_address());   //print message and client
00089     pc.printf("SERVER - Sending '%i' back to client %s\r\n", counter[0], client.get_address()); //print sending back
00090     server.sendTo(client, counter, n);                                                          //send message
00091 
00092 }   //end receive()
00093 
00094 /*********************************************************************************MAIN***/
00095 int main(void)
00096 {
00097     red = 1;
00098     green = 0;      //server
00099     
00100     init_usb();     //initialize the PC interface
00101     init_eth();     //initialize the Ethernet connection
00102 
00103     while (true)    //repeat forever
00104     {
00105         receive();  //wait for message
00106     }
00107 
00108 }   //end main()