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#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>
// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ 60
// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, xx, x, xx); // Hidden for this post
EthernetServer server(80); // create a server at port 80
File webFile; // the web page file on the SD card
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0; // index into HTTP_req buffer
unsigned char LED_state[3] = {0}; // stores the states of the LEDs, 1 bit per LED
void setup()
{
int i;
// disable Ethernet chip
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
Serial.begin(9600); // for debugging
// initialize SD card
Serial.println("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("ERROR - SD card initialization failed!");
return; // init failed
}
Serial.println("SUCCESS - SD card initialized.");
// check for index.htm file
if (!SD.exists("index.htm")) {
Serial.println("ERROR - Can't find index.htm file!");
return; // can't find index file
}
Serial.println("SUCCESS - Found index.htm file.");
// pins 26 to 49 are outputs
for (i = 26; i <= 49; i++) {
pinMode(i, OUTPUT); // set pins as outputs
digitalWrite(i, LOW); // switch the output pins off
}
Ethernet.begin(mac, ip); // initialize Ethernet device
server.begin(); // start to listen for clients
}
void loop()
{
EthernetClient client = server.available(); // try to get client
if (client) { // got client?
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) { // client data available to read
char c = client.read(); // read 1 byte (character) from client
// limit the size of the stored received HTTP request
// buffer first part of HTTP request in HTTP_req array (string)
// leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
if (req_index < (REQ_BUF_SZ - 1)) {
HTTP_req[req_index] = c; // save HTTP request character
req_index++;
}
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
// remainder of header follows below, depending on if
// web page or XML page is requested
// Ajax request - send XML file
if (StrContains(HTTP_req, "ajax_inputs")) {
// send rest of HTTP header
client.println("Content-Type: text/xml");
client.println("Connection: keep-alive");
client.println();
SetLEDs();
// send XML file containing input states
XML_response(client);
}
else { // web page request
// send rest of HTTP header
client.println("Content-Type: text/html");
client.println("Connection: keep-alive");
client.println();
// send web page
webFile = SD.open("index.htm"); // open web page file
if (webFile) {
while(webFile.available()) {
client.write(webFile.read()); // send web page to client
}
webFile.close();
}
}
// display received HTTP request on serial port
//Serial.print(HTTP_req);
// reset buffer index and all buffer elements to 0
req_index = 0;
StrClear(HTTP_req, REQ_BUF_SZ);
break;
}
// every line of text received from the client ends with \r\n
if (c == '\n') {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != '\r') {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1); // give the web browser time to receive the data
client.stop(); // close the connection
} // end if (client)
}
// checks if received HTTP request is switching on/off LEDs
// also saves the state of the LEDs
void SetLEDs(void)//Need help understanding starting here---------------
{
char str_on[12] = {0};//why the number 12? This has 24 output
char str_off[12] = {0};//so 12 must be for something else?
unsigned char i;//Where is this storing the led states?
unsigned int j;//and what is the variable name/array that
int LED_num = 1;//is used to store them?
for (i = 0; i < 3; i++) {
for (j = 1; j <= 0x80; j <<= 1) {
sprintf(str_on, "LED%d=%d", LED_num, 1);//This is what REALLY //confuses me I know it's a decimal, but what and why is this saying?
sprintf(str_off, "LED%d=%d", LED_num, 0);//LED%d=%d. Why the = sign?
if (StrContains(HTTP_req, str_on)) {
LED_state[i] |= (unsigned char)j; // save LED state
digitalWrite(LED_num + 25, HIGH);
Serial.println("ON");//END OF HELP NEEDED : )...........
}
else if (StrContains(HTTP_req, str_off)) {
LED_state[i] &= (unsigned char)(~j); // save LED state
digitalWrite(LED_num + 25, LOW);
}
LED_num++;
}
}
}
// send the XML file with analog values, switch status
// and LED status
void XML_response(EthernetClient cl)
{
unsigned char i;
unsigned int j;
cl.print("<?xml version = \"1.0\" ?>");
cl.print("<inputs>");
for (i = 0; i < 3; i++) {
for (j = 1; j <= 0x80; j <<= 1) {
cl.print("<LED>");
if ((unsigned char)LED_state[i] & j) {
cl.print("checked");
//Serial.println("ON");
}
else {
cl.print("unchecked");
}
cl.println("</LED>");
}
}
cl.print("</inputs>");
}
// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
for (int i = 0; i < length; i++) {
str[i] = 0;
}
}
// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
char found = 0;
char index = 0;
char len;
len = strlen(str);
if (strlen(sfind) > len) {
return 0;
}
while (index < len) {
if (str[index] == sfind[found]) {
found++;
if (strlen(sfind) == found) {
return 1;
}
}
else {
found = 0;
}
index++;
}
return 0;
}
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