You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
141 lines
3.4 KiB
141 lines
3.4 KiB
<?php
|
|
|
|
namespace PHPModbus;
|
|
|
|
/**
|
|
* Phpmodbus Copyright (c) 2004, 2013 Jan Krakora
|
|
*
|
|
* This source file is subject to the "PhpModbus license" that is bundled
|
|
* with this package in the file license.txt.
|
|
*
|
|
* @author Jan Krakora
|
|
* @copyright Copyright (c) 2004, 2013 Jan Krakora
|
|
* @license PhpModbus license
|
|
* @category Phpmodbus
|
|
* @package Phpmodbus
|
|
* @version $id$
|
|
*/
|
|
|
|
/**
|
|
* IecType
|
|
*
|
|
* The class includes set of IEC-1131 data type functions that converts a PHP
|
|
* data types to a IEC data type.
|
|
*
|
|
* @author Jan Krakora
|
|
* @copyright Copyright (c) 2004, 2010 Jan Krakora
|
|
* @package Phpmodbus
|
|
*/
|
|
class IecType
|
|
{
|
|
/**
|
|
* iecBYTE
|
|
*
|
|
* Converts a value to IEC-1131 BYTE data type
|
|
*
|
|
* @param int $value from 0 to 255
|
|
* @return int IEC BYTE data type
|
|
*
|
|
*/
|
|
public static function iecBYTE($value)
|
|
{
|
|
return chr($value & 0xFF);
|
|
}
|
|
|
|
/**
|
|
* iecINT
|
|
*
|
|
* Converts a value to IEC-1131 INT data type
|
|
*
|
|
* @param int $value to be converted
|
|
* @return int IEC-1131 INT data type
|
|
*
|
|
*/
|
|
public static function iecINT($value)
|
|
{
|
|
return self::iecBYTE(($value >> 8) & 0x00FF) .
|
|
self::iecBYTE(($value & 0x00FF));
|
|
}
|
|
|
|
/**
|
|
* iecDINT
|
|
*
|
|
* Converts a value to IEC-1131 DINT data type
|
|
*
|
|
* @param int $value to be converted
|
|
* @param int $bigEndian defines endian codding (little endian == 0, big endian == 1)
|
|
* @return int IEC-1131 INT data type
|
|
*
|
|
*/
|
|
public static function iecDINT($value, $bigEndian = 0)
|
|
{
|
|
// result with right endianness
|
|
return self::endianness($value, $bigEndian);
|
|
}
|
|
|
|
/**
|
|
* iecREAL
|
|
*
|
|
* Converts a value to IEC-1131 REAL data type. The function uses function @use float2iecReal.
|
|
*
|
|
* @param int $value to be converted
|
|
* @param bool $bigEndian defines endian codding (little endian == 0, big endian == 1)
|
|
* @return int IEC-1131 REAL data type
|
|
*/
|
|
public static function iecREAL($value, $bigEndian = 0)
|
|
{
|
|
// iecREAL representation
|
|
$real = self::float2iecReal($value);
|
|
// result with right endianness
|
|
return self::endianness($real, $bigEndian);
|
|
}
|
|
|
|
/**
|
|
* float2iecReal
|
|
*
|
|
* This function converts float value to IEC-1131 REAL single precision form.
|
|
*
|
|
* For more see [{@link http://en.wikipedia.org/wiki/Single_precision Single precision on Wiki}] or
|
|
* [{@link http://de.php.net/manual/en/function.base-convert.php PHP base_convert function commentary}, Todd Stokes
|
|
* @ Georgia Tech 21-Nov-2007] or
|
|
* [{@link http://www.php.net/manual/en/function.pack.php PHP pack/unpack functionality}]
|
|
*
|
|
* @param float $value to be converted
|
|
* @return int IEC REAL data type
|
|
*/
|
|
private static function float2iecReal($value)
|
|
{
|
|
// get float binary string
|
|
$float = pack("f", $value);
|
|
// set 32-bit unsigned integer of the float
|
|
$w = unpack("L", $float);
|
|
return $w[1];
|
|
}
|
|
|
|
/**
|
|
* endianness
|
|
*
|
|
* Make endianess as required.
|
|
* For more see http://en.wikipedia.org/wiki/Endianness
|
|
*
|
|
* @param int $value
|
|
* @param bool $bigEndian
|
|
* @return int
|
|
*/
|
|
private static function endianness($value, $bigEndian = 0)
|
|
{
|
|
if ($bigEndian == 0) {
|
|
return
|
|
self::iecBYTE(($value >> 8) & 0x000000FF) .
|
|
self::iecBYTE(($value & 0x000000FF)) .
|
|
self::iecBYTE(($value >> 24) & 0x000000FF) .
|
|
self::iecBYTE(($value >> 16) & 0x000000FF);
|
|
} else {
|
|
return
|
|
self::iecBYTE(($value >> 24) & 0x000000FF) .
|
|
self::iecBYTE(($value >> 16) & 0x000000FF) .
|
|
self::iecBYTE(($value >> 8) & 0x000000FF) .
|
|
self::iecBYTE(($value & 0x000000FF));
|
|
}
|
|
}
|
|
}
|
|
|