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PHP Ajax串行端口字符串命令

[英]PHP Ajax Serial Port String Command

我是PHP和AJAX的新手,并且在过去的几周里一直在学习一些基础知识。在此过程中,我已经在该网站上使用了很多文章以寻求帮助,当我遇到当前问题时,我想这会成为一个很好的起点。

我想做的是将十六进制命令字符串传递给PHP,以便使用设备的串行端口输出。 我看到的问题是由于某种原因我传递给PHP的字符串在其中间添加了十六进制字符。 起初,我认为这与串行端口中定义的特殊字符有关,但是当我在PHP代码中定义字符串时,不会出现相同的错误。 我还注意到,在我的字符串中任何包含\\ xA#的字符之前都添加了附加字符,其中#可以是任何0-9的数字。

基本上我试图使用ajax将十六进制命令字符串\\ x55 \\ x05 \\ xA0 \\ x05 \\ x05发送到php,以在串行端口上输出。 当我执行命令时,我在串行端口上看到以下内容。 U0x050xc20xa0x050x05将“ 0xc2”添加到串行输出的过程中。 如前所述,它似乎与\\ xAO有关,因为当我用\\ x04替换为\\ x55 \\ x05 \\ x04 \\ x05 \\ x05时,我得到了u0x050x040x050x05的正确输出。 当我使用\\ A1时,也会出现相同的错误,也会发生此问题。

当我在PHP文件中定义字符串时,会得到U0x050xa0x050x05的正确输出

知道是什么原因造成的吗? 我是否应该将十六进制命令作为数组而不是字符串发送,并一次通过串行端口放入十六进制命令?

这是我的JavaScript和Ajax调用代码。 基本上,当我按下按钮时,我想将特定的十六进制命令字符串发送到PHP函数,并通过串行端口输出。

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <title>Button Test</title>

    <!-- CSS for presentation. -->
    <style>
    h1 { font-size: 20px; color: red; }
    button { color: black; }
    </style>
<script src="jquery.js">
</script>
<script>
function sercmd( stringcmd )
{
//Calling ajax and including the serial command to be sent out the serial port
//$.ajax({url: "sendserial.php", type: "POST", data: {serstr: stringcmd}, dataType: "json"});
$.ajax({
    url: "sendserial.php",
    type: "POST",
    data: {serstr: stringcmd},
    success: function ( resp ){
        if ( resp == 'true'){
            $( '.response' ).text( resp );
        } else {
            $( '.response' ).text( 'failure' );
        }
    }
});
}
</script>
</head>
<body>

    <h1>Test Page for MZC Control</h1>


    <button onclick="sercmd('\x55\x05\xA0\x05\x05') ">Zone 3 Power On</button>
    <button onclick="sercmd('\x55\x04\xA1\x02\x04') ">Zone 3 Power Off</button>
    <button onclick="sercmd('\x55\x05\xA3\x02\x00\x01') ">Zone 3 Source 1</button>
    <button onclick="sercmd('\x55\x05\xA3\x02\x01\x00') ">Zone 3 Source 2</button>


    <p> Control The Zones using the commands above. </p>   
<div class="response"></div>

</body>
</html>

这是AJAX调用的PHP页面中的代码

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');
include "php_serial.class.php";

$str = $_POST['serstr'];

//$str = '\x55\x04\xA0\x02\x05';

//$str = pack("H*",$str);

$serial = new phpSerial;
$serial->deviceSet("/dev/ttyUSB0");
$serial->confBaudRate(57600);
$serial->confParity("none");
$serial->confCharacterLength(8);
$serial->confStopBits(1);
$serial->confFlowControl("none");

$serial->deviceOpen();

$serial->sendMessage($str);

//$serial->sendMessage("\x55");

//$read = $serial->readPort();

$serial->deviceClose();

echo $str;
//echo "true";
//echo $read;
?>

以防万一有人对此感兴趣,这是我使用的php串行类的代码。 我发现此论坛中的其他人正在使用它。

<?php
define ("SERIAL_DEVICE_NOTSET", 0);
define ("SERIAL_DEVICE_SET", 1);
define ("SERIAL_DEVICE_OPENED", 2);

/**
 * Serial port control class
 *
 * THIS PROGRAM COMES WITH ABSOLUTELY NO WARANTIES !
 * USE IT AT YOUR OWN RISKS !
 *
 * @author Rémy Sanchez <thenux@gmail.com>
 * @thanks Aurélien Derouineau for finding how to open serial ports with windows
 * @thanks Alec Avedisyan for help and testing with reading
 * @copyright under GPL 2 licence
 */
class phpSerial
{
    var $_device = null;
    var $_windevice = null;
    var $_dHandle = null;
    var $_dState = SERIAL_DEVICE_NOTSET;
    var $_buffer = "";
    var $_os = "";

    /**
     * This var says if buffer should be flushed by sendMessage (true) or manualy (false)
     *
     * @var bool
     */
    var $autoflush = true;

    /**
     * Constructor. Perform some checks about the OS and setserial
     *
     * @return phpSerial
     */
    function phpSerial ()
    {
        setlocale(LC_ALL, "en_US");

        $sysname = php_uname();

        if (substr($sysname, 0, 5) === "Linux")
        {
            $this->_os = "linux";

            if($this->_exec("stty --version") === 0)
            {
                register_shutdown_function(array($this, "deviceClose"));
            }
            else
            {
                trigger_error("No stty availible, unable to run.", E_USER_ERROR);
            }
        }
        elseif(substr($sysname, 0, 7) === "Windows")
        {
            $this->_os = "windows";
            register_shutdown_function(array($this, "deviceClose"));
        }
        else
        {
            trigger_error("Host OS is neither linux nor windows, unable tu run.", E_USER_ERROR);
            exit();
        }
    }

    //
    // OPEN/CLOSE DEVICE SECTION -- {START}
    //

    /**
     * Device set function : used to set the device name/address.
     * -> linux : use the device address, like /dev/ttyS0
     * -> windows : use the COMxx device name, like COM1 (can also be used
     *     with linux)
     *
     * @param string $device the name of the device to be used
     * @return bool
     */
    function deviceSet ($device)
    {
        if ($this->_dState !== SERIAL_DEVICE_OPENED)
        {
            if ($this->_os === "linux")
            {
                if (preg_match("@^COM(\d+):?$@i", $device, $matches))
                {
                    $device = "/dev/ttyS" . ($matches[1] - 1);
                }

                if ($this->_exec("stty -F " . $device) === 0)
                {
                    $this->_device = $device;
                    $this->_dState = SERIAL_DEVICE_SET;
                    return true;
                }
            }
            elseif ($this->_os === "windows")
            {
                if (preg_match("@^COM(\d+):?$@i", $device, $matches) and $this->_exec(exec("mode " . $device)) === 0)
                {
                    $this->_windevice = "COM" . $matches[1];
                    $this->_device = "\\.\com" . $matches[1];
                    $this->_dState = SERIAL_DEVICE_SET;
                    return true;
                }
            }

            trigger_error("Specified serial port is not valid", E_USER_WARNING);
            return false;
        }
        else
        {
            trigger_error("You must close your device before to set an other one", E_USER_WARNING);
            return false;
        }
    }

    /**
     * Opens the device for reading and/or writing.
     *
     * @param string $mode Opening mode : same parameter as fopen()
     * @return bool
     */
    function deviceOpen ($mode = "r+b")
    {
        if ($this->_dState === SERIAL_DEVICE_OPENED)
        {
            trigger_error("The device is already opened", E_USER_NOTICE);
            return true;
        }

        if ($this->_dState === SERIAL_DEVICE_NOTSET)
        {
            trigger_error("The device must be set before to be open", E_USER_WARNING);
            return false;
        }

        if (!preg_match("@^[raw]\+?b?$@", $mode))
        {
            trigger_error("Invalid opening mode : ".$mode.". Use fopen() modes.", E_USER_WARNING);
            return false;
        }

        $this->_dHandle = @fopen($this->_device, $mode);

        if ($this->_dHandle !== false)
        {
            stream_set_blocking($this->_dHandle, 0);
            $this->_dState = SERIAL_DEVICE_OPENED;
            return true;
        }

        $this->_dHandle = null;
        trigger_error("Unable to open the device", E_USER_WARNING);
        return false;
    }

    /**
     * Closes the device
     *
     * @return bool
     */
    function deviceClose ()
    {
        if ($this->_dState !== SERIAL_DEVICE_OPENED)
        {
            return true;
        }

        if (fclose($this->_dHandle))
        {
            $this->_dHandle = null;
            $this->_dState = SERIAL_DEVICE_SET;
            return true;
        }

        trigger_error("Unable to close the device", E_USER_ERROR);
        return false;
    }

    //
    // OPEN/CLOSE DEVICE SECTION -- {STOP}
    //

    //
    // CONFIGURE SECTION -- {START}
    //

    /**
     * Configure the Baud Rate
     * Possible rates : 110, 150, 300, 600, 1200, 2400, 4800, 9600, 38400,
     * 57600 and 115200.
     *
     * @param int $rate the rate to set the port in
     * @return bool
     */
    function confBaudRate ($rate)
    {
        if ($this->_dState !== SERIAL_DEVICE_SET)
        {
            trigger_error("Unable to set the baud rate : the device is either not set or opened", E_USER_WARNING);
            return false;
        }

        $validBauds = array (
            110    => 11,
            150    => 15,
            300    => 30,
            600    => 60,
            1200   => 12,
            2400   => 24,
            4800   => 48,
            9600   => 96,
            19200  => 19,
            38400  => 38400,
            57600  => 57600,
            115200 => 115200
        );

        if (isset($validBauds[$rate]))
        {
            if ($this->_os === "linux")
            {
                $ret = $this->_exec("stty -F " . $this->_device . " " . (int) $rate, $out);
            }
            elseif ($this->_os === "windows")
            {
                $ret = $this->_exec("mode " . $this->_windevice . " BAUD=" . $validBauds[$rate], $out);
            }
            else return false;

            if ($ret !== 0)
            {
                trigger_error ("Unable to set baud rate: " . $out[1], E_USER_WARNING);
                return false;
            }
        }
    }

    /**
     * Configure parity.
     * Modes : odd, even, none
     *
     * @param string $parity one of the modes
     * @return bool
     */
    function confParity ($parity)
    {
        if ($this->_dState !== SERIAL_DEVICE_SET)
        {
            trigger_error("Unable to set parity : the device is either not set or opened", E_USER_WARNING);
            return false;
        }

        $args = array(
            "none" => "-parenb",
            "odd"  => "parenb parodd",
            "even" => "parenb -parodd",
        );

        if (!isset($args[$parity]))
        {
            trigger_error("Parity mode not supported", E_USER_WARNING);
            return false;
        }

        if ($this->_os === "linux")
        {
            $ret = $this->_exec("stty -F " . $this->_device . " " . $args[$parity], $out);
        }
        else
        {
            $ret = $this->_exec("mode " . $this->_windevice . " PARITY=" . $parity{0}, $out);
        }

        if ($ret === 0)
        {
            return true;
        }

        trigger_error("Unable to set parity : " . $out[1], E_USER_WARNING);
        return false;
    }

    /**
     * Sets the length of a character.
     *
     * @param int $int length of a character (5 <= length <= 8)
     * @return bool
     */
    function confCharacterLength ($int)
    {
        if ($this->_dState !== SERIAL_DEVICE_SET)
        {
            trigger_error("Unable to set length of a character : the device is either not set or opened", E_USER_WARNING);
            return false;
        }

        $int = (int) $int;
        if ($int < 5) $int = 5;
        elseif ($int > 8) $int = 8;

        if ($this->_os === "linux")
        {
            $ret = $this->_exec("stty -F " . $this->_device . " cs" . $int, $out);
        }
        else
        {
            $ret = $this->_exec("mode " . $this->_windevice . " DATA=" . $int, $out);
        }

        if ($ret === 0)
        {
            return true;
        }

        trigger_error("Unable to set character length : " .$out[1], E_USER_WARNING);
        return false;
    }

    /**
     * Sets the length of stop bits.
     *
     * @param float $length the length of a stop bit. It must be either 1,
     * 1.5 or 2. 1.5 is not supported under linux and on some computers.
     * @return bool
     */
    function confStopBits ($length)
    {
        if ($this->_dState !== SERIAL_DEVICE_SET)
        {
            trigger_error("Unable to set the length of a stop bit : the device is either not set or opened", E_USER_WARNING);
            return false;
        }

        if ($length != 1 and $length != 2 and $length != 1.5 and !($length == 1.5 and $this->_os === "linux"))
        {
            trigger_error("Specified stop bit length is invalid", E_USER_WARNING);
            return false;
        }

        if ($this->_os === "linux")
        {
            $ret = $this->_exec("stty -F " . $this->_device . " " . (($length == 1) ? "-" : "") . "cstopb", $out);
        }
        else
        {
            $ret = $this->_exec("mode " . $this->_windevice . " STOP=" . $length, $out);
        }

        if ($ret === 0)
        {
            return true;
        }

        trigger_error("Unable to set stop bit length : " . $out[1], E_USER_WARNING);
        return false;
    }

    /**
     * Configures the flow control
     *
     * @param string $mode Set the flow control mode. Availible modes :
     *  -> "none" : no flow control
     *  -> "rts/cts" : use RTS/CTS handshaking
     *  -> "xon/xoff" : use XON/XOFF protocol
     * @return bool
     */
    function confFlowControl ($mode)
    {
        if ($this->_dState !== SERIAL_DEVICE_SET)
        {
            trigger_error("Unable to set flow control mode : the device is either not set or opened", E_USER_WARNING);
            return false;
        }

        $linuxModes = array(
            "none"     => "clocal -crtscts -ixon -ixoff",
            "rts/cts"  => "-clocal crtscts -ixon -ixoff",
            "xon/xoff" => "-clocal -crtscts ixon ixoff"
        );
        $windowsModes = array(
            "none"     => "xon=off octs=off rts=on",
            "rts/cts"  => "xon=off octs=on rts=hs",
            "xon/xoff" => "xon=on octs=off rts=on",
        );

        if ($mode !== "none" and $mode !== "rts/cts" and $mode !== "xon/xoff") {
            trigger_error("Invalid flow control mode specified", E_USER_ERROR);
            return false;
        }

        if ($this->_os === "linux")
            $ret = $this->_exec("stty -F " . $this->_device . " " . $linuxModes[$mode], $out);
        else
            $ret = $this->_exec("mode " . $this->_windevice . " " . $windowsModes[$mode], $out);

        if ($ret === 0) return true;
        else {
            trigger_error("Unable to set flow control : " . $out[1], E_USER_ERROR);
            return false;
        }
    }

    /**
     * Sets a setserial parameter (cf man setserial)
     * NO MORE USEFUL !
     *  -> No longer supported
     *  -> Only use it if you need it
     *
     * @param string $param parameter name
     * @param string $arg parameter value
     * @return bool
     */
    function setSetserialFlag ($param, $arg = "")
    {
        if (!$this->_ckOpened()) return false;

        $return = exec ("setserial " . $this->_device . " " . $param . " " . $arg . " 2>&1");

        if ($return{0} === "I")
        {
            trigger_error("setserial: Invalid flag", E_USER_WARNING);
            return false;
        }
        elseif ($return{0} === "/")
        {
            trigger_error("setserial: Error with device file", E_USER_WARNING);
            return false;
        }
        else
        {
            return true;
        }
    }

    //
    // CONFIGURE SECTION -- {STOP}
    //

    //
    // I/O SECTION -- {START}
    //

    /**
     * Sends a string to the device
     *
     * @param string $str string to be sent to the device
     * @param float $waitForReply time to wait for the reply (in seconds)
     */
    function sendMessage ($str, $waitForReply = 0.1)
    {
        $this->_buffer .= $str;

        if ($this->autoflush === true) $this->flush();

        usleep((int) ($waitForReply * 1000000));
    }

    /**
     * Reads the port until no new datas are availible, then return the content.
     *
     * @pararm int $count number of characters to be read (will stop before
     *  if less characters are in the buffer)
     * @return string
     */
    function readPort ($count = 0)
    {
        if ($this->_dState !== SERIAL_DEVICE_OPENED)
        {
            trigger_error("Device must be opened to read it", E_USER_WARNING);
            return false;
        }

        if ($this->_os === "linux")
        {
            $content = ""; $i = 0;

            if ($count !== 0)
            {
                do {
                    if ($i > $count) $content .= fread($this->_dHandle, ($count - $i));
                    else $content .= fread($this->_dHandle, 128);
                } while (($i += 128) === strlen($content));
            }
            else
            {
                do {
                    $content .= fread($this->_dHandle, 128);
                } while (($i += 128) === strlen($content));
            }

            return $content;
        }
        elseif ($this->_os === "windows")
        {
            /* Do nohting : not implented yet */
        }

        trigger_error("Reading serial port is not implemented for Windows", E_USER_WARNING);
        return false;
    }

    /**
     * Flushes the output buffer
     *
     * @return bool
     */
    function flush ()
    {
        if (!$this->_ckOpened()) return false;

        if (fwrite($this->_dHandle, $this->_buffer) !== false)
        {
            $this->_buffer = "";
            return true;
        }
        else
        {
            $this->_buffer = "";
            trigger_error("Error while sending message", E_USER_WARNING);
            return false;
        }
    }

    //
    // I/O SECTION -- {STOP}
    //

    //
    // INTERNAL TOOLKIT -- {START}
    //

    function _ckOpened()
    {
        if ($this->_dState !== SERIAL_DEVICE_OPENED)
        {
            trigger_error("Device must be opened", E_USER_WARNING);
            return false;
        }

        return true;
    }

    function _ckClosed()
    {
        if ($this->_dState !== SERIAL_DEVICE_CLOSED)
        {
            trigger_error("Device must be closed", E_USER_WARNING);
            return false;
        }

        return true;
    }

    function _exec($cmd, &$out = null)
    {
        $desc = array(
            1 => array("pipe", "w"),
            2 => array("pipe", "w")
        );

        $proc = proc_open($cmd, $desc, $pipes);

        $ret = stream_get_contents($pipes[1]);
        $err = stream_get_contents($pipes[2]);

        fclose($pipes[1]);
        fclose($pipes[2]);

        $retVal = proc_close($proc);

        if (func_num_args() == 2) $out = array($ret, $err);
        return $retVal;
    }

    //
    // INTERNAL TOOLKIT -- {STOP}
    //
}
?>

可能的解决方案

将十六进制转换为字符串,并将字符串转换为十六进制

将十六进制转换为字符串,然后发送。 然后,返回十六进制。

使用此功能:

<?php
function strToHex($string){
    $hex = '';
    for ($i=0; $i<strlen($string); $i++){
        $ord = ord($string[$i]);
        $hexCode = dechex($ord);
        $hex .= substr('0'.$hexCode, -2);
    }
    return strToUpper($hex);
}
function hexToStr($hex){
    $string='';
    for ($i=0; $i < strlen($hex)-1; $i+=2){
        $string .= chr(hexdec($hex[$i].$hex[$i+1]));
    }
    return $string;
}

页面字符集

检查您的主要和辅助页面的字符集

参考文献

// i try this code and it works well with me
 <meta charset="UTF-8"/>
    <?PHP
     exec("mode COM6: BAUD=9600 PARITY=n DATA=8 STOP=1 to=off dtr=off rts=off");
     echo ord(97);
     $fp =fopen("COM6", "r+");
     fwrite($fp,'b');
     fclose($fp);
   ?>

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