Ethernet_Project

#include "etherShield.h"


// please modify the following two lines. mac and ip have to be unique
// in your local area network. You can not have the same numbers in
// two devices:
static uint8_t mymac[6] = {
  0x54,0x55,0x58,0x10,0x00,0x24};
static uint8_t myip[4] = {
  192,168,1,15};
static char baseurl[]="http://192.168.1.15/";
static uint16_t mywwwport =80; // listen port for tcp/www (max range 1-254)



#define BUFFER_SIZE 500
static uint8_t buf[BUFFER_SIZE+1];
#define STR_BUFFER_SIZE 22
static char strbuf[STR_BUFFER_SIZE+1];

EtherShield es=EtherShield();

// prepare the webpage by writing the data to the tcp send buffer
uint16_t print_webpage(uint8_t *buf, byte on_off);
int8_t analyse_cmd(char *str);

// LED cathode connects the Pin4, anode to 5V through 1K resistor
#define LED_PIN  4


void setup(){

  /*initialize enc28j60*/
  es.ES_enc28j60Init(mymac);
  es.ES_enc28j60clkout(2); // change clkout from 6.25MHz to 12.5MHz
  delay(10);

  /* Magjack leds configuration, see enc28j60 datasheet, page 11 */
  // LEDA=greed LEDB=yellow
  //
  // 0x880 is PHLCON LEDB=on, LEDA=on
  // enc28j60PhyWrite(PHLCON,0b0000 1000 1000 00 00);
  es.ES_enc28j60PhyWrite(PHLCON,0x880);
  delay(500);
  //
  // 0x990 is PHLCON LEDB=off, LEDA=off
  // enc28j60PhyWrite(PHLCON,0b0000 1001 1001 00 00);
  es.ES_enc28j60PhyWrite(PHLCON,0x990);
  delay(500);
  //
  // 0x880 is PHLCON LEDB=on, LEDA=on
  // enc28j60PhyWrite(PHLCON,0b0000 1000 1000 00 00);
  es.ES_enc28j60PhyWrite(PHLCON,0x880);
  delay(500);
  //
  // 0x990 is PHLCON LEDB=off, LEDA=off
  // enc28j60PhyWrite(PHLCON,0b0000 1001 1001 00 00);
  es.ES_enc28j60PhyWrite(PHLCON,0x990);
  delay(500);
  //
  // 0x476 is PHLCON LEDA=links status, LEDB=receive/transmit
  // enc28j60PhyWrite(PHLCON,0b0000 0100 0111 01 10);
  es.ES_enc28j60PhyWrite(PHLCON,0x476);
  delay(100);

  //init the ethernet/ip layer:
  es.ES_init_ip_arp_udp_tcp(mymac,myip,80);

  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);  // switch on LED
}

void loop(){
  uint16_t plen, dat_p;
  int8_t cmd;
  byte on_off = 1;

  plen = es.ES_enc28j60PacketReceive(BUFFER_SIZE, buf);

  /*plen will ne unequal to zero if there is a valid packet (without crc error) */
  if(plen!=0){

    // arp is broadcast if unknown but a host may also verify the mac address by sending it to a unicast address.
    if(es.ES_eth_type_is_arp_and_my_ip(buf,plen)){
      es.ES_make_arp_answer_from_request(buf);
      return;
    }

    // check if ip packets are for us:
    if(es.ES_eth_type_is_ip_and_my_ip(buf,plen)==0){
      return;
    }

    if(buf[IP_PROTO_P]==IP_PROTO_ICMP_V && buf[ICMP_TYPE_P]==ICMP_TYPE_ECHOREQUEST_V){
      es.ES_make_echo_reply_from_request(buf,plen);
      return;
    }

    // tcp port www start, compare only the lower byte
    if (buf[IP_PROTO_P]==IP_PROTO_TCP_V&&buf[TCP_DST_PORT_H_P]==0&&buf[TCP_DST_PORT_L_P]==mywwwport){
      if (buf[TCP_FLAGS_P] & TCP_FLAGS_SYN_V){
        es.ES_make_tcp_synack_from_syn(buf); // make_tcp_synack_from_syn does already send the syn,ack
        return;
      }
      if (buf[TCP_FLAGS_P] & TCP_FLAGS_ACK_V){
        es.ES_init_len_info(buf); // init some data structures
        dat_p=es.ES_get_tcp_data_pointer();
        if (dat_p==0){ // we can possibly have no data, just ack:
          if (buf[TCP_FLAGS_P] & TCP_FLAGS_FIN_V){
            es.ES_make_tcp_ack_from_any(buf);
          }
          return;
        }
        if (strncmp("GET ",(char *)&(buf[dat_p]),4)!=0){

          plen=es.ES_fill_tcp_data_p(buf,0,PSTR("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1>200 OK</h1>"));
          goto SENDTCP;
        }
        if (strncmp("/ ",(char *)&(buf[dat_p+4]),2)==0){
          plen=print_webpage(buf, on_off);
          goto SENDTCP;
        }
        cmd=analyse_cmd((char *)&(buf[dat_p+5]));

        if (cmd==2){
          on_off=1;
          digitalWrite(LED_PIN, LOW);  // switch on LED
        }
        else if (cmd==3){
          on_off=0;
          digitalWrite(LED_PIN, HIGH);  // switch off LED
        }
        plen=print_webpage(buf, on_off);

        plen=print_webpage(buf, on_off);
SENDTCP:
        es.ES_make_tcp_ack_from_any(buf); // send ack for http get
        es.ES_make_tcp_ack_with_data(buf,plen); // send data
      }
    }
  }

}
// The returned value is stored in the global var strbuf
uint8_t find_key_val(char *str,char *key)
{
  uint8_t found=0;
  uint8_t i=0;
  char *kp;
  kp=key;
  while(*str &&  *str!=' ' && found==0){
    if (*str == *kp){
      kp++;
      if (*kp == '\0'){
        str++;
        kp=key;
        if (*str == '='){
          found=1;
        }
      }
    }
    else{
      kp=key;
    }
    str++;
  }
  if (found==1){
    // copy the value to a buffer and terminate it with '\0'
    while(*str &&  *str!=' ' && *str!='&' && i<STR_BUFFER_SIZE){
      strbuf[i]=*str;
      i++;
      str++;
    }
    strbuf[i]='\0';
  }
  return(found);
}

int8_t analyse_cmd(char *str)
{
  int8_t r=-1;

  if (find_key_val(str,"cmd")){
    if (*strbuf < 0x3a && *strbuf > 0x2f){
      // is a ASCII number, return it
      r=(*strbuf-0x30);
    }
  }
  return r;
}


uint16_t print_webpage(uint8_t *buf, byte on_off)
{

  int i=0;


  uint16_t plen;



  plen=es.ES_fill_tcp_data_p(buf,0,PSTR("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n"));
  plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<center><p><h1>Welcome to the DBM Switch Controller </h1></p> "));

  plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<hr><br><form METHOD=get action=\""));
  plen=es.ES_fill_tcp_data(buf,plen,baseurl);
  plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("\">"));
  plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<h2> REMOTE SWITCH: </h2> "));
  plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<h1><font color=\"#00FF00\"> "));

  if(on_off)
    plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("ON"));
  else
    plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("OFF"));

  plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("  </font></h1><br> ") );

  if(on_off){
    plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<input type=hidden name=cmd value=3>"));
    plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<input type=submit value=\"Switch off\"></form>"));
  }
  else {
    plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<input type=hidden name=cmd value=2>"));
    plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<input type=submit value=\"Switch on\"></form>"));
  }


  return(plen);
}