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dio_tcsetattr

(PHP 4 >= 4.3.0, PHP 5 < 5.1.0)

dio_tcsetattr — 设置串行端口的终端属性和波特率

说明

dio_tcsetattr(resource $fd, array $options): bool

dio_tcsetattr() 为打开的 fd 设置串行端口的终端属性和波特率。

参数

fd

由 dio_open() 返回的文件描述符。

options

当前可用选项：

'baud' - 端口波特率 - 可以是 38400、19200、9600、4800、2400、1800、1200、600、300、200、150、134、110、75 或 50，默认为 9600。
'bits' - 数据位 - 可以是 8、7、6 或 5。默认为 8。
'stop' - 停止位 - 可以是 1 或 2。默认为 1。
'parity' - 可以是 0、1 或 2。默认是 0。

返回值

没有返回值。

示例

示例 #1 在串口上设置波特率

<?php

$fd = dio_open('/dev/ttyS0', O_RDWR | O_NOCTTY | O_NONBLOCK);

dio_fcntl($fd, F_SETFL, O_SYNC);

dio_tcsetattr($fd, array(
  'baud' => 9600,
  'bits' => 8,
  'stop'  => 1,
  'parity' => 0
)); 

while (1) {

  $data = dio_read($fd, 256);

  if ($data) {
      echo $data;
  }
} 

?>

注释

注意: 此函数未在 Windows 平台下实现。

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User Contributed Notes 3 notes

down

daniel widyanto (kunilkuda at gmail dot com) ¶

18 years ago

I'm using PHP to interface my AVR microcontroller in /dev/ttyS0. I bet someone else does the same. 

Here's some hint : 
- dio_tcsetattr -> is set to enable : 
            - RTS / CTS hardware control
            - ICANON mode 
              (means that dio_read will wait until 0x0A/LF or other control character is entered in /dev/ttyS0 before it returns reading result, when you use dio_write it will also send 0x0A/LF automatically in the end of the message to your device).

For those who dont need RTS/CTS and/or ICANON, you can use linux command : stty.

Here's mine :

<?php
        exec('stty -F /dev/ttyS0 4800 raw');

        $fd=dio_open('/dev/ttyS0',O_RDWR | O_NOCTTY | O_NDELAY);
        dio_fcntl($fd,F_SETFL,0);

        dio_write($fd,"\x41",1);  // write 0x41 or 'A' to /dev/ttyS0
        
        // Replace result_length with your expected command result length
        for ($i=0;$i < result_length;$i++) {
               $result .=dio_read($fd, 1);
        }
        echo $result;
?>

Refer to :
- Serial Programming Guide for POSIX Operating Systems, http://www.easysw.com/~mike/serial/
- stty man pages

down

healer at colorado dot edu ¶

20 years ago

It was frustrating at first because I was trying to get my Linux box to talk to an external serial device (a PIC18F452 programmable chip) and the example provided here refers to fcntl() and open() parameters that aren't in the PHP documentation.

I finally found out what does what through the man pages:

man open
man fcntl

still haven't gotten it to work, or how to reset the ttySx, but thought it may help someone...

down

-1

fherrero at noticiasdenavarra dot com ¶

18 years ago

For Windows the Example 1 looks same this one:

<?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 (1) {

  $data = dio_read($fd, 256);

  if ($data) {
     echo $data;
  }
}

?>

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