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。我在这个网站上使用了不少帖子以获得帮助，当我出现当前的问题时认为这将是一个很好的起点。
我要做的是将一个十六进制命令字符串传递给PHP，以便使用我设备的串口输出。我看到的问题是，由于某种原因我传递给PHP的字符串是在它的中间添加一个十六进制字符。起初我认为这与串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，我没有得到相同的错误。我还注意到，在我的字符串中包含\ xA＃的任何字符之前添加了附加字符，其中＃可以是任意数字0-9。
基本上我正在尝试使用ajax将十六进制命令字符串\ x55 \ x05 \ xA0 \ x05 \ x05发送到php，以便在串行端口上输出。当我执行命令时，我在串行端口上看到以下内容。 U0x050xc20xa0x050x05 在某处，“0xc2”被添加到串行输出。如前所述它似乎与\ xAO有关，因为当我用\ x04替换它使字符串\ x55 \ x05 \ x04 \ x05 \ x05时，我得到正确的输出u0x050x040x050x05。当我使用\ A1时也会出现此问题。我也得到相同的错误。
当我在PHP文件中定义字符串时，我得到正确的输出U0x050xa0x050x05
知道造成这种情况的原因是什么？我应该将十六进制命令作为数组而不是字符串发送，并通过串口一次输出一个吗？
这是我的代码，带有javascript和ajax调用。基本上当我按下一个按钮时，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>
以下是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;
?>
以防有人对此感兴趣的是我正在使用的php序列类的代码。我发现这个论坛的其他人都在使用它。
<?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 $retVal;
}
//
// INTERNAL TOOLKIT -- {STOP}
//
}
?>
答案 0 :(得分：0)
将十六进制转换为字符串，然后发送。然后，回到十六进制。
使用此功能：
<?php
function strToHex($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;
}
检查主页和辅助页面的字符集
答案 1 :(得分：0)
// 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);
?>