php serial communication in linux

Question

I have installed xampp in fedora 13.I am trying to communicate with microcontroller through serial port using php serial class. My code is example.php

inclu         


        

Answer 1

Credit goes to Marc B's comment for causing me to look this up, and he's dead on: http://www.phpclasses.org/browse/file/17926.html

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;
    }
}

I believe that calling $serial->deviceSet("/dev/ttyUSB0"); will fix it, but you may have to modify the source of php_serial.class.php to work on /dev/ttyUSB instead of /dev/ttyS.