PHP 串口通讯

dio 扩展 https://pecl.php.net/package/dio
linux代码

<?php
$fd  =  dio_open ( '/dev/ttyS0' ,  O_RDWR  |  O_NOCTTY  |  O_NONBLOCK );
 
//dio_fcntl ( $fd ,  F_SETFL ,  O_SYNC );
if ( dio_fcntl ( $fd ,  F_SETLK , Array( "type" => F_WRLCK )) == - 1 ) {
    // the file descriptor appears locked
    echo  "The lock can not be cleared. It is held by someone else.\n" ;
} else {
   echo  "Lock successfully set/cleared\n" ;
}
 
dio_tcsetattr ( $fd , array(
   'baud'  =>  9600 ,
   'bits'  =>  8 ,
   'stop'   =>  1 ,
   'parity'  =>  0
)); 
 
while ( 1 ) {
   $data  =  dio_read ( $fd ,  9999 );
   if ( $data  ) {
      echo  bin2hex($data)."\n";
   }  
   usleep(300000);
}

windows 代码

<?php
 
exec('mode com1: baud=9600 data=8 stop=1 parity=n xon=on');
// execute 'help mode' in command line of Windows for help
 
$fd = dio_open('com1:', O_RDWR);
 
while ( true ) {
  $data  =  dio_read ( $fd ,  256 );
  if ($data) {
      echo bin2hex($data)."\n";
  }
  //usleep(10000);
}

其他参考： https://www.php.cn/php-ask-480151.html