Hello!
I've been somewhat stuck trying to figure out how to read input from the Microchip-based Ethernet shield.
I bought this one: http://ekitszone.com/Products/4-enc28j60-ethernet-shield-for-arduino.aspx
What I need to do, is to toggle an LED (this is just as a test) upon the press of a button (on the hosted by the arduino site),
The problem is, how do I get the input?
This is the sample code that came with the shield (the complete lib can be downloaded from the site mentioned above)
Any ideas? Any insight would be greatly appreciated!
#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] = {192,168,0,15};
static char baseurl[]="http://192.168.0.15/";
static uint16_t mywwwport =80; // listen port for tcp/www (max range 1-254)
// or on a different port:
//static char baseurl[]="http://10.0.0.24:88/";
//static uint16_t mywwwport =88; // 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);
int8_t analyse_cmd(char *str);
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);
}
void loop(){
uint16_t plen, dat_p;
int8_t cmd;
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){
// head, post and other methods for possible status codes see:
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
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);
goto SENDTCP;
}
cmd=analyse_cmd((char *)&(buf[dat_p+5]));
if (cmd==1){
plen=print_webpage(buf);
}
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)
{
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 Arduino Ethernet Shield V1.0 </h1></p> "));
plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<hr>
<h2><font color=\"blue\">-- Put your ARDUINO online -- "));
plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("
Control digital outputs "));
plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("
Read digital analog inputs HERE "));
plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("
</font></h2> ") );
plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("</center><hr> V1.0 <a href=\"http://www.ekitszone.com\">www.ekitszone.com<a>"));
return(plen);
}