Porting i2c functionality to PHP scripts

src/php_top/Makefile

 DOCUMENTROOT=/www/pages
+INCLUDES=$(DOCUMENTROOT)/include
 OWN = -o root -g root
 INSTDOCS = 0644
 #INSTALL = install
@@ -16,6 +17,8 @@ PHP_SCRIPTS=camvars.php \
             phpinfo.php \
             snapfull.php
 
+PHPINCLUDES=i2c_include.php show_source_include.php
+            
 
 all:
 	@echo "make all in src"
@@ -25,8 +28,10 @@ all:
 install:
 	@echo "make install in src"
 	$(INSTALL) $(OWN) -d $(DESTDIR)$(DOCUMENTROOT)
+	$(INSTALL) $(OWN) -d $(DESTDIR)$(INCLUDES)
 	$(INSTALL) $(OWN) -m $(INSTDOCS) $(DOCS) $(DESTDIR)$(DOCUMENTROOT)
 	$(INSTALL) $(OWN) -m $(INSTDOCS) $(PHP_SCRIPTS) $(DESTDIR)$(DOCUMENTROOT)
+	$(INSTALL) $(OWN) -m $(INSTDOCS) $(PHPINCLUDES) $(DESTDIR)$(INCLUDES)
 	$(INSTALL) $(OWN) -d $(DESTDIR)$(SYSCONFDIR)
 	$(INSTALL) $(OWN) -d $(DESTDIR)$(CONFDIR)
 	$(INSTALL) $(OWN) -m $(INSTDOCS) -T autocampars.xml $(DESTDIR)$(CONFDIR)/autocampars0.xml

src/php_top/i2c.php

+<?php
+/*!***************************************************************************
+*! FILE NAME  : i2c.php
+*! DESCRIPTION: Provides single byte/short r/w from/to the i2c
+*!              Setting per-slave protection mask,
+*!              Synchronizing system clock with a "CMOS" one
+*!              Reading from/writing to EEPROM memory
+*! Copyright (C) 2008 Elphel, Inc
+*! -----------------------------------------------------------------------------**
+*!
+*!  This program is free software: you can redistribute it and/or modify
+*!  it under the terms of the GNU General Public License as published by
+*!  the Free Software Foundation, either version 3 of the License, or
+*!  (at your option) any later version.
+*!
+*!  This program is distributed in the hope that it will be useful,
+*!  but WITHOUT ANY WARRANTY; without even the implied warranty of
+*!  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*!  GNU General Public License for more details.
+*!
+*!  You should have received a copy of the GNU General Public License
+*!  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*! -----------------------------------------------------------------------------**
+*!  $Log: i2c.php,v $
+*!  Revision 1.7  2012/04/08 04:08:58  elphel
+*!  bug fix in temperature measurement
+*!
+*!  Revision 1.6  2012/01/16 01:42:24  elphel
+*!  comments
+*!
+*!  Revision 1.5  2011/12/22 05:35:11  elphel
+*!  Added "slow" option (for slow i2c devices) and reading the sensor board temperature
+*!
+*!  Revision 1.4  2011/08/13 00:51:21  elphel
+*!  support for "granddaughter" board ID eeprom
+*!
+*!  Revision 1.3  2011/01/18 17:38:34  dzhimiev
+*!  1. added <len> record,  passed through 'length'
+*!
+*!  Revision 1.2  2010/08/10 21:11:40  elphel
+*!  added EEPROM support of the 10359 and 10338D boards.
+*!
+*!  Revision 1.1.1.1  2008/11/27 20:04:03  elphel
+*!
+*!
+*!  Revision 1.8  2008/04/24 20:32:44  elphel
+*!  reverted, wrong edit
+*!
+*!  Revision 1.7  2008/04/24 18:19:50  elphel
+*!  changed to absolute path to i2c.inc
+*!
+*!  Revision 1.6  2008/03/16 01:24:09  elphel
+*!  Added i2c speed control interface
+*!
+*!  Revision 1.5  2008/03/15 23:05:18  elphel
+*!  split i2c.php into i2c.php and i2c.inc (to be used from other scripts)
+*!
+*!  Revision 1.4  2008/03/15 18:38:21  elphel
+*!  Implemented add-on boards EEPROM support
+*!
+*!  Revision 1.3  2008/02/20 07:41:42  elphel
+*!  report error if the date is wrong
+*!
+*!  Revision 1.2  2008/02/13 00:30:01  elphel
+*!  Added system time synchronization  with "CMOS" clock
+*!
+*!  Revision 1.1  2008/02/12 21:53:20  elphel
+*!  Modified I2c to support multiple buses, added raw access (no address registers) and per-slave protection bitmasks
+*!
+*!
+*/
+
+// In NC393: buses 0..3 - sensors(old bus=0), 4 - aux (old bus=1)
+set_include_path(get_include_path() . PATH_SEPARATOR . '/www/pages/include');
+require 'i2c_include.php';
+
+  $width=0;
+  $bus=0;
+  $adr=-1;
+  $data="";
+  $nopars=false;
+  $raw=0;
+  $wprot=-1;
+  $rprot=-1;
+  $rslt="";
+  $cmd="";
+//
+  $model="";
+  $rev="";
+  $brand="Elphel";
+  $serial="";
+  $time="";
+  $port="";
+  $part="";
+  $baud="";
+  $sync="";
+  $slowbus0=-1; // extra microseconds for SCL low and SCL high 
+  $EEPROM_bus0=false;
+  $EEPROM_chn=0; /// 0 - 10359/single 10338D, 1..3 - 10338D attached to the 10359
+  $application='';
+  $applicationMode=''; 
+  $sensor='';
+  $temperatureSA=0x30;
+  $temperarureDelay=1.0; // extra microseconds for SCL low/high (nominal 4, but works with 1)
+  $msg="<?xml version=\"1.0\"?>\n<i2c>\n";
+  if (count($_GET) == 0 ) {
+     $nopars=true;
+   } else {
+     $pars=array();
+     foreach($_GET as $key=>$value) {
+       switch($key) {
+         case "slow":
+         case "slowbus0":
+          $slowbus0=$value+0;
+          break;
+       case "cmd":
+         switch($value) {
+         case "fromCMOS":
+          $rslt=i2c_getCMOSClock()?"Set system time error (probably CMOS clock is not set)":("System clock is set to ".exec("date"));
+          break;
+         case "toCMOS":
+          $rslt=i2c_setCMOSClock();
+          break;
+         case "fromEEPROM":
+         case "toEEPROM":
+         case "fromEEPROM0":
+         case "toEEPROM0":
+         case "ctl":
+          $cmd=$value;
+          break;
+         }
+       break;
+       case "EEPROM_chn":
+          $EEPROM_chn=$value;
+          break;
+       case "app":
+       case "application":
+          $application=$value;
+          break;
+       case "mode":
+       case "application_mode":
+          $application_mode=$value;
+          break;
+       case "sensor":
+          $sensor=$value;
+          break;
+       case "port":
+          $port=$value;
+          break;
+       case "part":
+          $part=$value;
+          break;
+       case "baud":
+          $baud=$value;
+          break;
+       case "sync":
+          $sync=$value;
+          break;
+       case "model":
+          $model=$value;
+          break;
+       case "rev":
+          $rev=$value;
+          break;
+       case "serial":
+          $serial=$value;
+          break;
+       case "time": // seconds from 1970
+          $time=$value+0;
+          break;
+       case "raw":
+          $adr=($value+0) & ~0x7f;
+          $raw=1;
+          $width=8;
+          break;
+       case "width":
+          $width=$value+0;
+          break;
+       case "bus":
+          $bus=$value+0;
+          break;
+       case "adr":
+          $adr=$value+0;
+          break;
+       case "wp":
+          if      ($value==0) $wprot=0;
+          else if ($value==1) $wprot=1;
+          break;
+       case "rp":
+          if      ($value==0) $rprot=0;
+          else if ($value==1) $rprot=1;
+          break;
+       case "data":
+          $data=$value;
+          break;
+       case "length":
+          $length=$value+0;
+          break;
+       }
+     }
+   }
+
+   switch($cmd) {
+      case "fromEEPROM0":
+        $EEPROM_bus0=true; // and fall below
+      case "fromEEPROM":
+        $rslt=i2c_read256b(0xa0+($EEPROM_chn*($EEPROM_bus0?4:2)), $EEPROM_bus0?0:1);
+        $zero=strpos($rslt,chr(0));
+        if ($zero!==false) $rslt=substr($rslt,0, $zero);
+        if (substr($rslt,0,5)=="<?xml") {
+          $xml=simplexml_load_string($rslt);
+//  $temperatureSA=0x30;
+//  $temperarureDelay=1.0; // extra microseconds for SCL low/high (nominal 4, but works with 1)
+//          try reading sensor temperature (if available)
+          if ($EEPROM_bus0) {
+             $bus=0;
+             $sa=$temperatureSA+($EEPROM_chn*($EEPROM_bus0?4:2));
+             $data=i2c_receive_slow(16,$bus,$sa*128+5,0,$temperarureDelay);
+             if ($data>=0) { // <0 - i2c error - not implemented
+               $data= (($data & 0x1000)?-1:1)*($data&0xfff)/16.0;
+               $xml->addChild ('sensorTemperature',$data);
+               i2c_send_slow(8,$bus,$sa*128+8,3,0,$temperarureDelay); // set slow conversion, 1/16C resolution - for the next time
+             }
+          }
+          $xml_string=$xml->asXML();
+          header("Content-Type: text/xml");
+          header("Content-Length: ".strlen($xml_string)."\n");
+          header("Pragma: no-cache\n");
+          printf($xml_string);
+          exit (0);
+        }
+
+        break;
+      case "toEEPROM0":
+        $EEPROM_bus0=true; // and fall below
+      case "toEEPROM":
+        if ($wprot>=0) {
+          i2c_setprot ($EEPROM_bus0?0:1,0xa0+($EEPROM_chn*($EEPROM_bus0?4:2)),1,(1-$wprot));
+        }
+        if ($data=="") {
+          if ($model  === "") {$rslt="model  not specified"; break;}
+          if ($rev    === "") {$rslt="rev    not specified"; break;}
+          if ($serial === "") {$rslt="serial not specified"; break;}
+          if ($time   === "") {$rslt="time   not specified"; break;}
+           $xml = new SimpleXMLElement("<?xml version='1.0' standalone='yes'?><board/>");
+           if ($brand!='') $xml->addChild ('brand',$brand);
+           if ($model!='') $xml->addChild ('model',$model);
+           if ($rev!='') $xml->addChild ('rev',  $rev);
+           if ($serial!='') $xml->addChild ('serial',$serial);
+           if ($time!='') $xml->addChild ('time',$time);
+           if ($application!="") $xml->addChild ('app',$application);
+           if ($application_mode!="") $xml->addChild ('mode',$application_mode);
+           if ($sensor!='') $xml->addChild ('sensor',$sensor);
+           if ($length!='') $xml->addChild ('len',$length);
+           if ($port!='') $xml->addChild ('port',$port);
+           if ($part!='') $xml->addChild ('part',$part);
+           if ($baud!='') $xml->addChild ('baud',$baud);
+           if ($sync!='') $xml->addChild ('sync',$sync);
+           $data=$xml->asXML();
+        }
+        if (strlen($data)>256) {
+           $rslt="data too long - ".strlen($data)." bytes, only 256 are permitted";
+           break;
+        }
+        $rslt="written ".i2c_write256b($data,0xa0+($EEPROM_chn*($EEPROM_bus0?4:2)),$EEPROM_bus0?0:1);
+        i2c_setprot ($EEPROM_bus0?0:1,0xa0+($EEPROM_chn*($EEPROM_bus0?4:2)),1,0);
+        break;
+      case "ctl":
+        if ($bus==="") {
+         $rslt="i2c bus number is not specified";
+         break;
+        }
+        $rslt=i2c_ctl($bus,$data)->asXML();
+        header("Content-Type: text/xml");
+        header("Content-Length: ".strlen($rslt)."\n");
+        header("Pragma: no-cache\n");
+        printf($rslt);
+        exit (0);
+    }
+   if ($rslt=="") {
+    if (($adr>=0) && (($width==8) || ($width==16))) {
+      $slave=($adr >> (($width==16)?8:7)) & 0xfe;
+      if ($wprot>=0) {
+       i2c_setprot ($bus,$slave,1,(1-$wprot));
+      }
+      if ($rprot>=0) {
+       i2c_setprot ($bus,$slave,0,(1-$rprot));
+      }
+      $msg.="<width>".$width."</width>\n";
+      $msg.="<bus>".$bus."</bus>\n";
+      $msg.="<slave>".(sprintf("0x%x",($adr>>(($width==8)?7:8))  & 0xfe ))."</slave>\n";
+
+      if (!$raw) {
+        $msg.="<adr>".$adr."</adr>\n";
+        $msg.="<hex_adr>".sprintf("0x%x",$adr)."</hex_adr>\n";
+      }
+     if ($data!="") { //! i2c write
+      $data+=0;
+      $msg.="<data>".$data."</data>\n";
+      $msg.="<wdata>".$data."</wdata>\n";
+      $msg.="<hex_data>".sprintf("0x%x",$data)."</hex_data>\n";
+      $rslt=($slowbus0>=0)? i2c_send_slow($width,$bus,$adr,$data,$raw,$slowbus0): i2c_send($width,$bus,$adr,$data,$raw);;
+      if (!($rslt>0)) $msg.="<error> \"i2c write error (".$rslt.")\"</error>\n";
+     } else { //!i2c read
+      $data=($slowbus0>=0)? i2c_receive_slow($width,$bus,$adr,$raw,$slowbus0):i2c_receive($width,$bus,$adr,$raw);
+      $msg.="<data>".$data."</data>\n";
+      $msg.="<rdata>".$data."</rdata>\n";
+      $msg.="<hex_data>".sprintf("0x%x",$data)."</hex_data>\n";
+      if ($data==-1) $msg.="<error> \"i2c read error\"</error>\n";
+     }
+    } else {
+     if (!$nopars) $msg.="<error>\"Address (adr or raw) or width are not specified or are not positive.\"</error>\n";
+     $msg.="<usage>\"open URL: i2c.php?width&#061;www&amp;bus&#061;bbb&amp;adr&#061;aaa&amp;data&#061;ddd\"</usage>\n";
+    }
+   } else {
+      $msg.="<result>\"".$rslt."\"</result>\n";
+   }
+
+   $msg.="</i2c>\n";
+   header("Content-Type: text/xml");
+   header("Content-Length: ".strlen($msg)."\n");
+   header("Pragma: no-cache\n");
+   printf($msg);
+?>

src/php_top/i2c_include.php

+<?php
+/*!***************************************************************************
+*! FILE NAME  : i2c.inc
+*! DESCRIPTION: Provides functions to read/write over i2c buses in the camera,
+*!              low-level R/W and additionally:
+*!              Setting per-slave protection mask,
+*!              Synchronizing system clock with a "CMOS" one
+*!              Reading from/writing to EEPROM memory
+*! Copyright (C) 2008-2016 Elphel, Inc
+*! -----------------------------------------------------------------------------**
+*!
+*!  This program is free software: you can redistribute it and/or modify
+*!  it under the terms of the GNU General Public License as published by
+*!  the Free Software Foundation, either version 3 of the License, or
+*!  (at your option) any later version.
+*!
+*!  This program is distributed in the hope that it will be useful,
+*!  but WITHOUT ANY WARRANTY; without even the implied warranty of
+*!  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*!  GNU General Public License for more details.
+*!
+*!  You should have received a copy of the GNU General Public License
+*!  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*! -----------------------------------------------------------------------------**
+*!  $Log: i2c.inc,v $
+*!  Revision 1.4  2012/01/12 19:09:28  elphel
+*!  bug fix
+*!
+*!  Revision 1.3  2011/12/22 05:35:11  elphel
+*!  Added "slow" option (for slow i2c devices) and reading the sensor board temperature
+*!
+*!  Revision 1.2  2010/08/10 21:11:40  elphel
+*!  added EEPROM support of the 10359 and 10338D boards.
+*!
+*!  Revision 1.1.1.1  2008/11/27 20:04:03  elphel
+*!
+*!
+*!  Revision 1.3  2008/10/04 16:09:04  elphel
+*!  updating FPGA time with system time from CMOS
+*!
+*!  Revision 1.2  2008/06/04 20:26:23  elphel
+*!  includes SMBus operations, needed to activate USB on the 10369A board
+*!
+*!  Revision 1.2  2008/03/16 01:24:09  elphel
+*!  Added i2c speed control interface
+*!
+*!  Revision 1.1  2008/03/15 23:05:18  elphel
+*!  split i2c.php into i2c.php and i2c.inc (to be used from other scripts)
+*!
+*!
+*/
+//$i2c_slow_safe=array(3,4,2,2,7,7); /// sensor i2c delays are 2,2,1,1,7,7
+// In NC393: buses 0..3 - sensors(old bus=0), 4 - aux (old bus=1)
+/// NC393-fucnctions to read/write sensor ports
+/// Reusing NC53 parameters: $width->$name, $raw ->
+function i2c_send_sensor($name,         ///< device class name (get all by "cat /sys/devices/soc0/elphel393-sensor-i2c@0/i2c_all")
+		                 $sensor_port,  ///< sensor port :0..3
+		                 $ra,           ///< register address
+		                 $data,         ///< data to write
+		                 $sa7_offset=0) ///< slave address offset when there are multiple devices (2*sub-channel in 10359)
+		                                ///< return true on success, false on failure
+{ //$a<0 - use raw read/write
+	$path = '/sys/devices/soc0/elphel393-sensor-i2c@0/i2c'.strval($sensor_port);
+	$rslt = file_put_contents ($path, $name.' ' . strval($sa7_offset) . ' ' . strval($ra) . ' ' . strval($data));
+	return $rslt; 
+}
+
+function i2c_receive_sensor($name,         ///< device class name (get all by "cat /sys/devices/soc0/elphel393-sensor-i2c@0/i2c_all")
+		                    $sensor_port,  ///< sensor port :0..3
+		                    $ra,           ///< register address
+		                    $sa7_offset=0) ///< slave address offset when there are multiple devices (2*sub-channel in 10359)
+		                                   ///< @return read data or -1 on error
+{
+	// Initiate read
+	$path = '/sys/devices/soc0/elphel393-sensor-i2c@0/i2c'.strval($sensor_port);
+	$rslt = file_put_contents ($path, $name.' ' . strval($sa7_offset) . ' ' . strval($ra) );
+	if (!$rslt)
+		return -1;
+	$rslt = file_get_contents ($path);
+	if ($rslt === false)
+		return -1;
+	return intval($rslt);
+}
+/** Read 256 bytes from device as a string */
+function i2c_read256b_sensor($name,         ///< device class name (get all by "cat /sys/devices/soc0/elphel393-sensor-i2c@0/i2c_all")
+		                     $sensor_port,  ///< sensor port :0..3
+		                     $sa7_offset=0) ///< slave address offset when there are multiple devices (2*sub-channel in 10359)
+		                                    ///< @return read data string or partial (empty) string on error
+{
+	$rslt = '';
+	for ($ra=0;$ra<256;$ra++){
+		if (($d = i2c_receive_sensor($name,$sensor_port,$ra,$sa7_offset))<0) break;
+		$rslt .= chr($d);
+	}
+	return $rslt;
+}
+
+/** Write string to device */
+function i2c_write256b_sensor($data,         ///< Sring to write
+							  $name,         ///< device class name (get all by "cat /sys/devices/soc0/elphel393-sensor-i2c@0/i2c_all")
+							  $sensor_port,  ///< sensor port :0..3
+							  $sa7_offset=0) ///< slave address offset when there are multiple devices (2*sub-channel in 10359)
+											 ///< @return number of bytes written
+{
+	$len = 0;
+	for ($ra=0;$ra<strlen($data);$ra++){
+		$b = ord(substr($data,$ra,1));
+		if (($d = i2c_send_sensor($name,$sensor_port,$ra,$b,$sa7_offset))<0) break;
+		usleep(10000);
+		$len ++;
+	}
+	return $len;
+}
+
+///sys/devices/soc0/elphel393-sensor-i2c@0# echo "mt9p006 8 9" > i2c3; cat i2c3
+/*
+cy22393: 0x69 1 1 100 kHz
+sensor_temp: 0x18 1 2 100 kHz
+sensor_eeprom: 0x50 1 1 100 kHz
+pca9500_eeprom: 0x50 1 1 100 kHz
+el10359_32: 0x8 1 4 500 kHz
+el10359: 0x8 1 2 500 kHz
+mt9p006: 0x48 1 2 500 kHz
+mt9f002: 0x10 2 2 500 kHz
+ */
+
+function getSlowArray($usec=0){
+  if ($usec<0) $usec=0;
+  $SCL_low=3+(int) ($usec*8);
+  $SCL_high=4+(int) ($usec*8);
+  if ($SCL_low>254) $SCL_low=254;
+  if ($SCL_high>254) $SCL_high=254;
+  $i2c_slow_safe=array($SCL_low ,$SCL_high,2,2,7,7); /// sensor i2c delays are 2,2,1,1,7,7
+  return $i2c_slow_safe;
+}
+///Map i2c bus of 393 to "old" one
+function i2c_bus353($bus){
+	if ($bus<4) return 0;
+	else return $bus-3;
+}
+function i2c_ctl($bus,$data="") { //!$data - string of decimal values separated by ":", empty - don't change
+   $size=6; // bytes per bus
+   $data=trim($data);
+   if ($data!="") {
+     $darr=explode(":",$data);
+     $i2cctl  = fopen('/dev/xi2cctl', 'w');
+     for ($i=0; ($i<$size) && ($i<count($darr)); $i++) if ($darr[$i]!=""){
+       fseek ($i2cctl, i2c_bus353($bus)*$size+$i) ;
+       fwrite($i2cctl, chr($darr[$i]+0), 1);
+     }
+     fclose($i2cctl);
+   }
+   $i2cctl  = fopen('/dev/xi2cctl', 'r');
+   fseek ($i2cctl, i2c_bus353($bus)*$size) ;
+   $data = fread($i2cctl, $size);
+   fclose($i2cctl);
+   $xml = new SimpleXMLElement("<?xml version='1.0'?><i2cctl/>");
+           $xml->addChild ('scl_high',ord($data[0]));
+           $xml->addChild ('scl_low', ord($data[1]));
+           $xml->addChild ('slave2master', ord($data[2]));
+           $xml->addChild ('master2slave', ord($data[3]));
+           $xml->addChild ('filter_sda',   ord($data[4]));
+           $xml->addChild ('filter_scl',   ord($data[5]));
+//           $data=$xml->asXML();
+   return $xml;
+
+} // end of i2c_ctl()
+
+function i2c_ctl_arr($bus,$darr=array()) { //!$data - 6-element array
+   $size=6; // bytes per bus
+   if (count($darr)>00) {
+     $i2cctl  = fopen('/dev/xi2cctl', 'w');
+     for ($i=0; ($i<$size) && ($i<count($darr)); $i++) if ($darr[$i]!=""){
+       fseek ($i2cctl, i2c_bus353($bus)*$size+$i) ;
+       fwrite($i2cctl, chr($darr[$i]+0), 1);
+     }
+     fclose($i2cctl);
+   }
+   $i2cctl  = fopen('/dev/xi2cctl', 'r');
+   fseek ($i2cctl, i2c_bus353($bus)*$size) ;
+   $data = fread($i2cctl, $size);
+   fclose($i2cctl);
+   for ($i=0;$i<$size; $i++) $darr[$i]=ord($data[$i]);
+   return $darr;
+} // end of i2c_ctl()
+
+
+function i2c_send($width, $bus, $a, $d, $raw = 0) { // $a<0 - use raw read/write
+	if ($bus < 4)
+		return i2c_send_sensor ( $width, $bus, $a, $d, $raw );
+	else
+		$bus = i2c_bus353 ( $bus );
+	$bus353 = i2c_bus353 ( $bus );
+	$w = ($width == 16) ? 2 : 1;
+	$i2c_fn = '/dev/xi2c' . ($raw ? 'raw' : (($w == 2) ? '16' : '8')) . (($bus == 0) ? '' : '_aux');
+	$i2c = fopen ( $i2c_fn, 'w' );
+	fseek ( $i2c, $w * $a );
+	if ($w == 1)
+		$res = fwrite ( $i2c, chr ( $d ) );
+	else
+		$res = fwrite ( $i2c, chr ( floor ( $d / 256 ) ) . chr ( $d - 256 * floor ( $d / 256 ) ) );
+	fclose ( $i2c );
+	return $res;
+} // end of i2c_send()
+
+function i2c_send_slow($width, $bus, $a, $d, $raw = 0, $extrausec = -1) { // $a<0 - use raw read/write
+	if ($bus < 4)
+		return i2c_send_sensor ( $width, $bus, $a, $d, $raw );
+	else
+		$bus = i2c_bus353 ( $bus );
+	if (($bus == 0) && ($extrausec >= 0)) {
+		$i2c_old_ctrl = i2c_ctl_arr ( 0 );
+		i2c_ctl_arr ( 0, getSlowArray ( $extrausec ) );
+	}
+	$w = ($width == 16) ? 2 : 1;
+	$i2c_fn = '/dev/xi2c' . ($raw ? 'raw' : (($w == 2) ? '16' : '8')) . (($bus == 0) ? '' : '_aux');
+	$i2c = fopen ( $i2c_fn, 'w' );
+	fseek ( $i2c, $w * $a );
+	if ($w == 1)
+		$res = fwrite ( $i2c, chr ( $d ) );
+	else
+		$res = fwrite ( $i2c, chr ( floor ( $d / 256 ) ) . chr ( $d - 256 * floor ( $d / 256 ) ) );
+	fclose ( $i2c );
+	if (($bus == 0) && ($extrausec >= 0)) {
+		i2c_ctl_arr ( 0, $i2c_old_ctrl ); // / restore old speed (not thread-safe)
+	}
+	return $res;
+} // end of i2c_send()
+
+function smbus_send($a, $d) { // d - array
+	$i2c_fn = '/dev/xi2c8_aux';
+	$i2c = fopen ( $i2c_fn, 'w' );
+	fseek ( $i2c, $a );
+	$cmd = chr ( count ( $d ) );
+	foreach ( $d as $b )
+		$cmd .= chr ( $b );
+		// var_dump($cmd);
+	$res = fwrite ( $i2c, $cmd );
+	fclose ( $i2c );
+	return $res;
+} // end of i2c_send()
+
+function i2c_receive($width, $bus, $a, $raw = 0) {
+	if ($bus < 4)
+		return i2c_receive_sensor ( $width, $bus, $a, $raw );
+	else
+		$bus = i2c_bus353 ( $bus );
+	$w = ($width == 16) ? 2 : 1;
+	$i2c_fn = '/dev/xi2c' . ($raw ? 'raw' : (($w == 2) ? '16' : '8')) . (($bus == 0) ? '' : '_aux');
+	$i2c = fopen ( $i2c_fn, 'r' );
+	fseek ( $i2c, $w * $a );
+	$data = fread ( $i2c, $w );
+	fclose ( $i2c );
+	if (strlen ( $data ) < $w)
+		return - 1;
+	$v = unpack ( ($w == 1) ? 'C' : 'n1', $data );
+	return $v [1];
+} // end of i2c_receive()
+function i2c_receive_slow($width, $bus, $a, $raw = 0, $extrausec = -1) {
+	if ($bus < 4)
+		return i2c_receive_sensor ( $width, $bus, $a, $raw );
+	else
+		$bus = i2c_bus353 ( $bus );
+	if (($bus == 0) && ($extrausec >= 0)) {
+		$i2c_old_ctrl = i2c_ctl_arr ( 0 );
+		i2c_ctl_arr ( 0, getSlowArray ( $extrausec ) );
+	}
+	$w = ($width == 16) ? 2 : 1;
+	$i2c_fn = '/dev/xi2c' . ($raw ? 'raw' : (($w == 2) ? '16' : '8')) . (($bus == 0) ? '' : '_aux');
+	$i2c = fopen ( $i2c_fn, 'r' );
+	fseek ( $i2c, $w * $a );
+	$data = fread ( $i2c, $w );
+	fclose ( $i2c );
+	if (strlen ( $data ) < $w)
+		return - 1;
+	$v = unpack ( ($w == 1) ? 'C' : 'n1', $data );
+	if ($bus == 0) {
+		i2c_ctl_arr ( 0, $i2c_old_ctrl ); // / restore old speed (not thread-safe)
+	}
+	return $v [1];
+} // end of i2c_receive()
+
+function i2c_setprot($bus, $slave, $bit, $value) { // !slave is MSB aligned, LSB==0)
+	$bus = i2c_bus353 ( $bus );
+	$i2cprot = fopen ( "/dev/xi2cenable", 'r+' );
+	
+	fseek ( $i2cprot, ($bus * 128) + ($slave >> 1) );
+	$data = ord ( fread ( $i2cprot, 1 ) );
+	if ($value)
+		$data |= (1 << $bit);
+	else
+		$data &= ~ (1 << $bit);
+	fseek ( $i2cprot, ($bus * 128) + ($slave >> 1) );
+	fwrite ( $i2cprot, chr ( $data ) );
+	fclose ( $i2cprot );
+} // end of i2c_setprot ()
+
+function i2c_getCMOSClock() {
+	echo "**** FUNCTION NOT SUPPORTED in NC393 *****";
+	return - 1;
+	$i2c = fopen ( '/dev/xi2c8_aux', 'r' );
+	fseek ( $i2c, 0x5102 ); // seconds in clock on the 10369 board
+	$data = fread ( $i2c, 7 ); // sec/min/hours/days/weekdays/century-months/years, BCD
+	fclose ( $i2c );
+	if (strlen ( $data ) < 7)
+		return "error";
+	$v = unpack ( 'C*', $data );
+	$d = array (
+			"sec" => ($v [1] & 0xf) + 10 * (($v [1] >> 4) & 0x7),
+			"min" => ($v [2] & 0xf) + 10 * (($v [2] >> 4) & 0x7),
+			"hrs" => ($v [3] & 0xf) + 10 * (($v [3] >> 4) & 0x3),
+			"day" => ($v [4] & 0xf) + 10 * (($v [4] >> 4) & 0x3),
+			"wday" => $v [5] & 0x7,
+			"month" => ($v [6] & 0xf) + 10 * (($v [6] >> 4) & 0x1),
+			"year" => ($v [7] & 0xf) + 10 * (($v [7] >> 4) & 0xf) + (($v [6] & 0x80) ? 2000 : 1900) 
+	);
+	exec ( "date -s " . sprintf ( "%02d%02d%02d%02d%04d.%02d", $d ["month"], $d ["day"], $d ["hrs"], $d ["min"], $d ["year"], $d ["sec"] ), $out, $ret );
+	if ($ret == 0) {
+		elphel_set_fpga_time ( time () + 0.0 );
+	}
+	return $ret;
+} // end of i2c_getCMOSClock()
+
+function i2c_bcd($v) {
+  $d=intval($v,10);
+  return $d + 6*floor($d/10);
+} // end of i2c_bcd($v)
+
+function i2c_setCMOSClock(){
+ $ts=time();
+ $data=chr(i2c_bcd(gmdate("s",$ts))).
+       chr(i2c_bcd(gmdate("i",$ts))).
+       chr(i2c_bcd(gmdate("H",$ts))).
+       chr(i2c_bcd(gmdate("d",$ts))).
+       chr(i2c_bcd(gmdate("w",$ts))).
+       chr(i2c_bcd(gmdate("m",$ts))+ ((intval(gmdate("Y",$ts),10)>=2000)?0x80:0)).
+       chr(i2c_bcd(gmdate("y",$ts)));
+   $i2c  = fopen('/dev/xi2c8_aux', 'w');
+   fseek ($i2c, 0x5102) ; //seconds in clock on the 10369 board
+   $written= fwrite($i2c, $data);
+   fclose($i2c);
+   if ($written < strlen($data)) return "error";
+   return "OK";
+} // end of i2c_setCMOSClock()
+
+function i2c_read256b($slave=0xa0,$bus=1,$extrausec=0) { //will read 256 bytes from slave (address is 8-bit, includes r/~w)
+	if ($bus < 4)
+		return i2c_read256b_sensor ( $slave, $bus, $extrausec); // ($name, $sensor_port, $sa7_offset)
+	else
+		$bus = i2c_bus353 ( $bus );
+	if (($bus==0) && ($extrausec>=0)){
+     $i2c_old_ctrl= i2c_ctl_arr(0); 
+     i2c_ctl_arr(0,getSlowArray($extrausec));
+   }
+   $i2c_fn='/dev/xi2c8'.(($bus==0)?'':'_aux');
+   $i2c  = fopen($i2c_fn, 'r');
+   fseek ($i2c, $slave*128) ; //256 per slave, but slave are only even
+   $data = fread($i2c, 256);  // full 256 bytes
+   fclose($i2c);
+   if (($bus==0) && ($extrausec>=0)){
+     i2c_ctl_arr(0,$i2c_old_ctrl); /// restore old speed (not thread-safe)
+   }
+   return $data;
+} // end of i2c_read256b ()
+//this EEPROM writes only 4 bytes sequentionally (only 2 LSBs are incremented)
+function i2c_write256b($data, $slave=0xa0,$bus=1,$extrausec=0) { //will write up to 256 bytes $data to slave (address is 8-bit, includes r/~w). EEPROM should be un-protected
+	if ($bus < 4)
+		return i2c_write256b_sensor ($data, $slave, $bus, $extrausec); // ($data, $name, $sensor_port, $sa7_offset)
+	else
+		$bus = i2c_bus353 ( $bus );
+	if (($bus==0) && ($extrausec>=0)){
+     $i2c_old_ctrl= i2c_ctl_arr(0); 
+     i2c_ctl_arr(0,getSlowArray($extrausec));
+   }
+   $maxretries=200; //measured - 19
+   if (!is_string($data)) return -1;
+   if (strlen($data)>256) return -2;
+   if (strlen($data)<256) $data.=chr(0);
+   $i2c_fn='/dev/xi2c8'.(($bus==0)?'':'_aux');
+   $i2c  = fopen($i2c_fn, 'w');
+   $len=0;
+   for ($i=0;$i<strlen($data); $i+=4) {
+     for ($retry=0; $retry< $maxretries; $retry++) {
+       fseek ($i2c, $slave*128+$i) ; //256 per slave, but slave are only even
+       $rslt=fwrite($i2c, substr($data,$i,4));
+       if ($rslt>0) break;
+     }
+     if ($rslt<=0) {
+      $len=$rslt;
+      break;
+     }
+     $len+=$rslt;
+   }
+   fclose($i2c);
+   if (($bus==0) && ($extrausec>=0)){
+     i2c_ctl_arr(0,$i2c_old_ctrl); /// restore old speed (not thread-safe)
+   }
+   return $len;
+} // end of i2c_write256b ()
+?>

src/php_top/show_source_include.php

+<?php
+/*!***************************************************************************
+*! FILE NAME  : show_source.inc
+*! DESCRIPTION: Outputs program source code if url has 'source' parameter.
+*! Copyright (C) 2012 Elphel, Inc
+*! -----------------------------------------------------------------------------**
+*!
+*!  This program is free software: you can redistribute it and/or modify
+*!  it under the terms of the GNU General Public License as published by
+*!  the Free Software Foundation, either version 3 of the License, or
+*!  (at your option) any later version.
+*!
+*!  This program is distributed in the hope that it will be useful,
+*!  but WITHOUT ANY WARRANTY; without even the implied warranty of
+*!  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*!  GNU General Public License for more details.
+*!
+*!  You should have received a copy of the GNU General Public License
+*!  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+    if (array_key_exists('source',$_GET)) {
+      $source=file_get_contents ($_SERVER['SCRIPT_FILENAME']);
+      header("Content-Type: text/php");
+      header("Content-Length: ".strlen($source)."\n");
+      header("Pragma: no-cache\n");
+      echo $source;
+      exit(0);
+    }
+
+    if (array_key_exists('help',$_GET)) {
+	if (function_exists('_help')) {
+	    _help();
+	    exit(0);
+	}
+    }
+
+    if (count($_GET)==0) {
+	if (function_exists('_usage')) {
+	    _usage();
+	    exit(0);
+	}
+    }
+
+
+?>
\ No newline at end of file