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A console to the running system will let you correct a misconfigured network, for example. These serial ports typically provide a console to the bootloader and, when the firmware has booted, a console to the running system. Most devices supported by OpenWrt have or can be modified to have a serial port. However, some bootloaders don't have a “really failsafe” network re-flash feature, making a serial console one of the few ways to recover from a “bad flash” or an error in a user's own configuration. Is this a problem with the php_serial.Most people get along without a serial console for their device because they're able to flash a working firmware the first time - or are able to apply various recovery methods - and do all their communicating with the device over a network. Specified serial port is not valid in /var/on line 111 Warning: Unable to set the baud rate : the device is either not set or opened in /var/on line 204 Warning: Unable to set parity : the device is either not set or opened in /var/on line 254 Warning: Unable to set length of a character : the device is either not set or opened in /var/on line 298 Warning: Unable to set the length of a stop bit : the device is either not set or opened in /var/on line 335 Warning: Unable to set flow control mode : the device is either not set or opened in /var/on line 376 Warning: The device must be set before to be open in /var/on line 137 Warning: Device must be opened to read it in /var/on line 474 I edited the $serial ->deviceSet() and now a bunch of errors appear Usb 3-2: FTDI USB Serial Device converter now attached to ttyUSB0įtdi_sio ttyUSB0: ftdi_submit_read_urb - failed submitting read urb, error -1

I have my doubts that the php_serial.class file has trouble running the serial connection through USB, any ideas?Īlso it seems like there is a problem with this: # dmesg | grep tty To write into $serial->sendMessage("1") $serial->confStopBits(2) //Stop bits (this is the "1" in "8-N-1") $serial->confCharacterLength(8) //Character length (this is the "8" in "8-N-1") $serial->confParity("none") //Parity (this is the "N" in "8-N-1")

If you want to change the configuration, the device must be closed Ini_set('display_errors', '1') //displays php errorsĭeviceSet('ttyUSB0') //for linux serial /dev/ttySP(0-4) for usb /dev/ttyUSBN Here is my script error_reporting(E_ALL)

I am using a USB to serial cable for the purpose, but my php script is giving me the following error:įatal error: Call to undefined function deviceSet() I am trying to communicate with a micro controller trough a serial port under Linux.