Serial Console Most routers have a serial console connection on the board, however most router and ther consumer products don't have a serial connection connector (RS-232) or something alike available. For this some soldering is required. With a serial console connection It is possible to:. Access the.
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Re-flash firmware. Follow (debug) output of the entire boot process of the device.
loading and executing the kernel. linux init output. Login to the Linux Most router / consumer products will require to solder some wires to the board and connect that to a Level Converter (USB) before it can be connected to a PC. This is due to voltage differences between embedded devices and PC's. There are very check USB TTL converters available.
It requires soldering 3 wires (RT, TX and GND) on the board of the device to the USB TTL converter. The USB converter can be directly inserted into a USB port of a PC and will provide a /dev/ttyUSBn serial device. Has a very good generic page on this soldering and level conversion:.
And many device specific pages on describe some details for that device on how to connect using a serial console. Managing to get a serial console interface to your device is one thing, a second thing is how to connect to it, and more importantly, how to interrupt the from booting directly into the kernel and flash a new firmware. In the example below I use minicom. There are more terminal programs available, however they will all require to set the serial connections settings as below. Minicom Configuration Use dmesg to see which device name has been assigned to the serial port connection to your device and next configure minicom using minicom -s.
8.554670 usb 2-2: cp210x converter now attached to ttyUSB0 Serial Port Setup +-+ A - Serial Device: /dev/ttyUSB0 B - Lockfile Location: /var/lock C - Callin Program: D - Callout Program: E - Bps/Par/Bits: 115200 8N1 F - Hardware Flow Control: No G - Software Flow Control: No Change which setting? +-+ +-Modem and dialing parameter setup-+ A - Init string. B - Reset string. C - Dialing prefix #1. Minicom Minicom example on the TP-Link TL-WR1043ND. Start mini com, now without -s. Type 'enter' once to see some output, or unplug and plug the power to your router and follow the boot process.
See on how to interrupt the bootloader from automatically loading / booting the kernel. Welcome to minicom 2.4 OPTIONS: I18n Compiled on Sep 5 2010, 08:31:32. Port /dev/ttyUSB0 Press CTRL-A Z for help on special keys U-Boot 1.1.4 (Mar 31 2012 - 10:40:21) AP83 (ar9100) U-boot 0.0.11 DRAM: sri 32 MB id read 0x100000ff flash size 8MB, sector count = 128 Flash: 8 MB Using default environment In: serial Out: serial Err: serial Net: ag7100enetinitialize. No valid address in Flash. Using fixed address: cfg1 0xf cfg2 0x7114 eth0: 00:03:7f:09:0b:ad eth0 up eth0 Autobooting in 1 secondsar7100 ar7100 CTRL-A Z for help 115200 8N1 NOR Minicom 2.4 VT102 Offline.
I want to transfer some serial data as explained here: on an openwrt router. However, I directly connected to the serial port of the router as opposed to usb(in the guide) so now I don't know which of the following is the device: Which one of the following is the serial port of the router? Bus mtd1 mtd5 null ttyATH0 ttyS15 ttyS9 console mtd1ro mtd5ro port ttyS0 ttyS2 urandom full mtd2 mtdblock0 ppp ttyS1 ttyS3 watchdog kmsg mtd2ro mtdblock1 ptmx ttyS10 ttyS4 zero log mtd3 mtdblock2 pts ttyS11 ttyS5 mem mtd3ro mtdblock3 random ttyS12 ttyS6 mtd0 mtd4 mtdblock4 shm ttyS13 ttyS7 mtd0r o mtd4ro mtdblock5 tty ttyS14 ttyS8 When I connect the device using serial, nothing new shows up so it must be one of those. Edit: The results of cat /proc/cmdline board=TL-WR703N console=ttyATH0,115200 rootfstype=squashfs,jffs2 noinitrd.
As far as I understand, you are trying to connect Arduino board to your router's console port, that you've soldered. The device name is /dev/ttyATH0. I would make following test. If Arduino sends something on start, you can set the desired baudrate via stty and then execute cat /dev/ttyATH0 and see, if startup message appears. If Arduino awaits commands, before it sends data, you will need minicom or screen, so that you can send/receive data over serial link. Possible issues: this port is owned by both kernel ( console=ttyATH0,115200) and init processes (see /etc/inittab), that means, that even if can use the port, kernel messages can interfere with your data.