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