How To Reset Raspberry Pi Network Settings
Installation and configuration of Raspberry Pi¶
This folio consists an installation guide to use if you have a Linux laptop, and a split up guide to employ with a Windows laptop.
The p-net stack and sample application has been tested with:
-
Raspberry Pi 3 Model B+
To avert problems it is recommended to showtime with a fresh Raspberry Pi Os image.
When running the Raspberry Pi as a Profinet IO-device using p-net, the network settings of the Raspberry Pi will exist changed past Profinet. Therefore it is highly recommended to use a keyboard, mouse and monitor or a series cable.
If yous use ssh yous may end upwards in a situation were you have difficulties connecting to, or recovering your device. If you lot currently do non have a suitable USB-to-serial cable you can even so build and run p-internet with the sample awarding just you might run into problem when a PLC is used for configuration.
Installation using a Linux laptop¶
Burn down a SD-bill of fare with Raspberry Pi OS, by using the "Raspberry Pi imager" software and a SD card reader. A card size of 16 - 32 GByte is recommended. Follow the instructions on the page https://www.raspberrypi.com/software/ Select the standard "Raspberry Pi OS" operating organisation.
Unplug, and reinsert your SD-card to mount it. To enable SSH logging in on the Raspberry Pi, create an empty file on the named ssh in the boot partition:
To enable the serial port console add this line to the file config.txt in the boot division:
The DHCP client daemon will arrange the network interface settings automatically. This interferes with the p-net control of the Ethernet interface. So if you run your Raspberry Pi equally a Profinet IO-Device (Non if you employ it as a PLC) and have a serial cable, you demand to add together this line to /etc/dhcpcd.conf in the root file organisation:
If you would similar to change hostname from raspberrypi to pndevice-pi , change the texts in the files etc/hostname and etc/hosts in the rootfs partition.
To make sure that you afterwards are logging in to the right Raspberry Pi, y'all tin create a file in the dwelling directory in the rootfs division. Change name to something informative, for example:
touch abode / pi / IAmAProfinetDevice Unmount the SD-carte du jour, and plug information technology in into your Raspberry Pi. Power up the Raspberry Pi. Log in to it via a serial cable (run across beneath). Employ the username pi and the default countersign raspberry .
If yous do not have any serial cablevision (and not take disabled DHCP), connect the Raspberry Pi to your local network. Find the IP address of it past running this on a Linux machine on the network (replace the hostname if you have changed it):
Verify that it is the right machine by checking that is disappears when the power is disconnected.
Log in to information technology:
Enter the password mentioned merely above.
If you would connect your Raspberry Pi to a WiFi network, follow the guide in https://world wide web.raspberrypi.com/documentation/computers/configuration.html
You might as well desire to disable the splash screen and to expand the file system, past using the raspi-config utility.
Note
If you are following the tutorial and are setting up the IO-device, you should head back now. See Tutorial.
Installation using a Windows laptop¶
This section describes how to install the Raspberry Pi OS and how to enable ssh and serial console so that the Raspberry Pi can exist used in headless mode without a display and keyboard connected.
Step 1. Write Raspberry Pi OS paradigm to SD card using Raspberry Pi Imager.
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Download and install Raspberry Pi Imager from https://world wide web.raspberrypi.com/software/
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Start Raspberry Pi Imager
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In the Select OS dialog choose total version
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Select SD-card
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Press Write
Stride ii. Initial configuration of Raspberry Pi Os.
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Squirt SD-card
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Reinsert SD-card in windows PC. The SD-card will be shown every bit external drive named
boot. -
Enable ssh by creating an empty file named
sshin the root binder ofkick. The windows file explorer can be used for this. Note that the filesshshall not accept a txt file extension. -
Enable serial port console. Open up
config.txtin root binder ofbootusing Notepad. Add together the lineenable_uart=aneto the stop of the file. Relieve file and close Notepad. -
Squirt SD-card
Step 3. Start Raspberry Pi
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Insert SD-card and power on Raspberry Pi.
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Login (preferably using serial console) with default user
piand passwordraspberry.
Stride 4. Network configuration.
Apply the nano editor to edit the configuration files as described beneath. For example to edit the /etc/dhcpcd.conf :
sudo nano / etc / dhcpcd . conf Relieve the file in nano by pressing CTRL-X , and then Y and Enter .
The DHCP client daemon volition adapt the network interface settings automatically. This interferes with the p-cyberspace control of the Ethernet interface. So if y'all run your Raspberry Pi every bit a Profinet IO-Device (NOT if you lot utilise it as a PLC) and take a series cable, you should add the line below to /etc/dhcpcd.conf :
Optionally, to modify hostname from raspberrypi to pndevice-pi , change the configuration in the files /etc/hostname and /etc/hosts .
To make sure that you subsequently are logging in to the correct Raspberry Pi, yous can create a file in the home directory in the rootfs partition. Change name to something informative, for example:
touch / home / pi / IAmAProfinetDevice Reboot and the Raspberry Pi is now gear up to run the p-internet sample application:
If y'all would connect your Raspberry Pi to a WiFi network, follow the guide in https://world wide web.raspberrypi.com/documentation/computers/configuration.html
You might as well want to disable the splash screen and to expand the file system, past using the raspi-config utility.
Annotation
If you are following the tutorial and are setting upward the IO-device, you should head back now. Come across Tutorial.
Optionally connect a series cable to Raspberry Pi¶
The p-internet Profinet stack will alter the IP-address of the Raspberry Pi when running it as an IO-Device (equally requested by the PLC), why it can exist inconvenient to connect to it via ssh. You tin use a keyboard, mouse and a monitor to connect to the Raspberry Pi. Using a serial cable to connect it to your laptop tin can and so be helpful if a keyboard etc not is available.
Utilize a USB-to-series adapter cable with three.3 Five logic levels. For example Adafruit sells a popular version of those cables. Connect the USB end to your laptop and the other end to the header connector on the Raspberry Pi.
If not already done, enable the serial port console by writing the line enable_uart=1 in the file /boot/config.txt .
The series port within the Raspberry Pi will be named /dev/ttyS0 .
| Pin | Proper name | Terminal on cable | Adafruit cable color |
|---|---|---|---|
| 6 | GND | GND | Black |
| 8 | UART0_TXD | RX | White |
| 10 | UART0_RXD | TX | Green |
Use a communication program with a baud rate of 115200.
Before connecting the serial cable to your Raspberry Pi you tin can verify the functionality of the cable by connecting the USB connector to your Laptop, and connect the RX-terminal to the TX terminal of the cable. Employ a communication program to verify that text that you enter is echoed back. When removing the RX-to-TX connectedness the echo should stop.
Optionally connect LEDs and buttons to Raspberry Pi¶
You need these components:
| Component | Number required |
|---|---|
| LED | 2 |
| Button switch | 2 |
| Resistor 220 Ohm | 4 |
Connect them like:
| Pin | Proper noun | Description |
|---|---|---|
| 9 | GND | |
| 11 | GPIO17 | Connect LED1 (application data) to GND via 220 Ohm |
| 13 | GPIO27 | Connect Button1 to three.3V via 220 Ohm |
| 15 | GPIO22 | Connect Button2 to 3.3V via 220 Ohm |
| xvi | GPIO23 | Connect LED2 (Profinet signal) to GND via 220 Ohm |
| 17 | 3.3V |
The resistors for the buttons are to limit the consequences of connecting the wires to wrong pins.
Fix upwards the GPIO pins for the buttons:
echo 22 > / sys / course / gpio / export echo 27 > / sys / class / gpio / export and for the LEDs:
echo 17 > / sys / class / gpio / export echo 23 > / sys / class / gpio / consign echo out > / sys / class / gpio / gpio17 / management repeat out > / sys / course / gpio / gpio23 / direction Plow on and off a LED:
echo i > / sys / class / gpio / gpio17 / value echo 0 > / sys / class / gpio / gpio17 / value Show land of buttons:
cat / sys / class / gpio / gpio22 / value true cat / sys / class / gpio / gpio27 / value 
Adjust IP address if using the Raspberry Pi as a PLC¶
If running your Raspberry Pi as a PLC (Profinet IO-Controller). you would like to have a static IP address (it will not work if running equally a Profinet IO-Device). Instead alter the file /etc/dhcpcd.conf to include these lines:
interface eth0 static ip_address = 192.168.0.100 / 24 Yous tin can all the same ping the <hostname>.local accost to find it on the network. To re-enable DHCP, remove the lines once more from /etc/dhcpcd.conf .
Once you have prepared the IP accost etc on the Raspberry Pi intended for use every bit a PLC, it is fourth dimension to install the Codesys runtime on information technology. Run into Using Codesys soft PLC.
Advanced users only: Automated kickoff of sample application¶
Utilise systemd to automatically start the p-internet sample application at boot on a Raspberry Pi. Place a systemd unit of measurement file here: /lib/systemd/system/pnet-sampleapp.service
An instance file is available in the sample_app/ directory of this repository. It assumes that the code is checked out into /home/pi/profinet/p-net/ on your Raspberry Pi. Install the files:
sudo cp / home / pi / profinet / p - cyberspace / src / ports / linux / pnet - sampleapp . service / lib / systemd / system / sudo cp / home / pi / profinet / p - internet / src / ports / linux / enable - rpi - gpio - pins . sh / usr / bin / sudo chmod + x / usr / bin / enable - rpi - gpio - pins . sh Adapt the contents to your paths and hardware.
Enable automatic startup:
sudo systemctl daemon - reload sudo systemctl enable pnet - sampleapp . service Showtime service:
sudo systemctl start pnet - sampleapp . service To meet the status of the process, and the log output:
systemctl status pnet - sampleapp . service journalctl - u pnet - sampleapp - f If using a serial cablevision, you might need to accommodate the number of visible columns:
You can for instance add information technology to your .bashrc file on the Raspberry Pi.
In order to speed upward the boot time, y'all might want to disable some functionality not necessary for Profinet applications. For example:
sudo systemctl disable cups - browsed . service sudo systemctl disable cups . service See the section "Boot time optimization" elsewhere in this documentation.
Advanced users simply: Control of congenital-in LEDs¶
The Raspberry Pi lath has LEDs on the board, typically a red PWR LED and a green ACT (action) LED.
Manually control the green LED (ACT = led0 ) on Raspberry Pi 3:
echo none > / sys / grade / leds / led0 / trigger echo one > / sys / grade / leds / led0 / brightness And to plough it off:
echo 0 > / sys / class / leds / led0 / effulgence Note that you need root privileges to control the LEDs.
Similarly for the blood-red (ability) LED, which is called led1 .
Advanced users only: Control Linux existent-fourth dimension backdrop¶
Run across the page on Linux timing in this documentation for an introduction to the subject field.
Add this to the starting time (and only) line in /kicking/cmdline.txt :
Run the sample application on a specific CPU core, by modifying the autostart file /lib/systemd/organisation/pnet-sampleapp.service (if installed):
ExecStart = taskset - c 2 / home / pi / profinet / build / pn_dev - v - b / sys / class / gpio / gpio27 / value - d / sys / grade / gpio / gpio22 / value SD-card problems¶
If y'all take problems with the CPU freezing for a few seconds at present and then, the SD-card might be damaged. There is a SD-card exam program bachelor for Raspberry Pi:
sudo apt update sudo apt install agnostics Start the test program:
pi@raspberrypi:~$ sh /usr/share/agnostics/sdtest.sh Example output for a damaged SD-menu:
Run i prepare - file ; 0 ; 0 ; 2029 ; 3 seq - write ; 0 ; 0 ; 2944 ; v rand - 4 yard - write ; 0 ; 0 ; 705 ; 176 rand - 4 k - read ; 7444 ; 1861 ; 0 ; 0 Sequential write speed 2944 KB / sec ( target 10000 ) - Fail Note that sequential write speed declines over fourth dimension equally a menu is used - your card may require reformatting Random write speed 176 IOPS ( target 500 ) - FAIL Random read speed 1861 IOPS ( target 1500 ) - Pass 
How To Reset Raspberry Pi Network Settings,
Source: https://rt-labs.com/docs/p-net/prepare_raspberrypi.html
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