====== LED from web page ======

===== Hardware =====

{{:cimg8954_.jpg?nolink&|}}

Connect LED between **GND** and **GPIO9** (CTS) pins.

===== Prepare firmware =====

**Don't install LUCI (or set different server port number in lighthttpd.conf)**

  Languages
    PHP
      php5
      php5-fastcgi
      php5-mod-json 
      php5-mod-sockets        

  Network
    Web Servers/Proxies
      lighttpd
        lighttpd-mod-cgi
        lighttpd-mod-fastcgi
        lighttpd-mod-simple-vhost

===== On Carambola =====
==== Firewall ====

Edit wan zone, to allow incoming connections.

  vi /etc/config/firewall

  config zone
        option name             wan
        option network          'wan'
        option input            ACCEPT
        option output           ACCEPT
        option forward          REJECT
        option masq             1
        option mtu_fix          1

  /etc/init.d/firewall restart

==== lighttpd.conf ====

  vi /etc/lighttpd/lighttpd.conf

  server.modules = (
          "mod_cgi"
          )
  
  server.network-backend = "write"
  server.document-root = "/www/"
  server.errorlog = "/var/log/lighttpd/error.log"
  index-file.names = ( "index.html", "default.html", "index.htm", "default.htm" )
  
  ## mimetype mapping
  mimetype.assign = (
                  ".jpg"   => "image/jpeg",
                  ".jpeg"  => "image/jpeg",
                  ".png"   => "image/png",
                  ".css"   => "text/css",
                  ".html"  => "text/html",
                  ".htm"   => "text/html",
                  ".js"    => "text/javascript"
  )
  
  $HTTP["url"] =~ "\.pdf$" {
         server.range-requests = "disable"
         }
  
  static-file.exclude-extensions = ( ".php", ".pl", ".fcgi" )
  server.pid-file = "/var/run/lighttpd.pid"
  server.upload-dirs = ( "/tmp" )
  cgi.assign = ( ".sh"  => "/bin/sh", ".php" => "/usr/bin/php-cgi")

==== lighthttp stuff ====

Reload liththttp server.
  /etc/init.d/lighttpd reload

View error log.
  cat /var/log/lighttpd/error.log 

==== /www/leds.php ====
  <?php
  
  if ($_POST['initialized']!=1) {
      echo "Initializing port<br>";
      exec("echo 9 > /sys/class/gpio/export", $output, $return);
      exec("echo out > /sys/devices/virtual/gpio/gpio9/direction", $output, $return);
  }
  
  if ($_POST['led']==2) {
      echo "Led ON";
      exec("echo 1 > /sys/devices/virtual/gpio/gpio9/value", $output, $return);
  
  }
  
  if ($_POST['led']==1) {
      echo "Led OFF";
      exec("echo 0 > /sys/devices/virtual/gpio/gpio9/value", $output, $return);
  }
  
  ?>
  
  
  <form method="post">
  <input type="hidden" name="led" value="2">
  <input type="hidden" name="initialized" value="1">
  <input type="submit" name="submit" value="Led ON"><br>
  </form>
  
  <form method="post">
  <input type="hidden" name="led" value="1">
  <input type="hidden" name="initialized" value="1">
  <input type="submit" name="submit" value="Led OFF"><br>
  </form>

===== HTTP testing =====

After you open this web page for the first time, it initializes GPIO.

{{:2013-03-17 14_33_03.png?nolink&|}}

After you press button it informs what's the status of the LED.