imported>Igor.vaisbein: /* Controller–area network (CAN) */

2020-04-21T12:53:27Z

‎Controller–area network (CAN)

Rinata at 11:50, 21 March 2018

2018-03-21T11:50:39Z

New page

== Overview ==
IOT-GATE-RPi comes with a Raspbian Linux image.
Raspbian Linux is a free operating system based on Debian optimized for the Raspberry Pi hardware.
It is the official supported operating system for Raspberry Pi.
Raspbian Linux image includes more than 35,000 software packages. Among them:
* Core system
* Debian package management system
* X11 Windowing System
* LXDE desktop manager
* SSH server and client
* Python, Scratch, Sonic Pi, Java and Mathematica
Additional images can be used with IOT-GATE-RPi. All optional images can be found in [https://www.raspberrypi.org/downloads/ Raspberry Pi downloads].
The [[IOT-GATE-RPi: Raspbian: Manual Installation]] page provides a brief introduction on how to install the Rasbian image.

== Using Raspbian Linux on IOT-GATE-RPi ==

=== Connection and Logging In ===
To login into the Linux system, use a keyboard and display or a serial console, connect through the network (ssh).

Use the following username and password to login:
<pre>
raspberrypi login: pi
Password: raspberry
</pre>

=== Networking ===
For most home networks, no further configuration is required in order to be able to connect to the Internet. For this to work, the router should be configured for DHCP (Dynamic Host
Configuration Protocol).

To configure networking, edit {{filename|/etc/network/interfaces}} and {{filename|/etc/dhcpcd.conf}}.
For more information about Debian Linux network configuration read:
* [http://www.debian.org/doc/manuals/reference/ch05.en.html Network setup] chapter in the [http://www.debian.org/doc/manuals/reference/index.en.html Debian Reference]
* [https://wiki.debian.org/NetworkConfiguration Network Configuration] chapter in the [https://wiki.debian.org/ Debian Wiki]

The majority of network setup can be done via the {{filename|interfaces}} configuration file at {{filename|/etc/network/interfaces}}.
{{Note|'''auto''' line is required for interfaces that have to be brought up at boot time.}}

* Using DHCP to automatically configure the interface
<pre>
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
</pre>

* Configuring the interface manually
<pre>
auto eth0
iface eth0 inet static
address 192.168.1.170
netmask 255.255.0.0
gateway 192.0.0.1
</pre>

=== RTC ===
==== Accessing and setting the RTC ====
To access the RTC time and date run:
<pre>
root@cm-debian:~# hwclock
Sat Jan 1 00:00:00 2000 -10.011159 seconds
</pre>

To set the date and write it into the RTC do the following:
<pre>
root@cm-debian:~# date -s "31 JUL 2015 10:00:00"
Fri Jul 31 10:00:00 UTC 2015
root@cm-debian:~# hwclock -w
root@cm-debian:~# hwclock
Fri Jul 31 10:00:13 2015 -1.066224 seconds
</pre>

=== Wifi ===
IOT-GATE-RPi features 802.11b/g/n wireless connectivity solution.

==== WiFi Initialization ====
* WiFi requires no user interaction for being configured. The drivers get loaded automatically.
Make sure that the WiFi drivers are loaded:
<pre>
root@cl-rootfs:~# lsmod
rt2800usb 18824 0
rt800lib 80070 1
rt2x00usb 12798 1
rt2x00lib 48694 3
</pre>
The WiFi driver can be loaded manually using {{cmd|modprobe}}.

* {{cmd|iwconfig}} command from {{filename|wireless-tools}} package can be used to retrieve detailed information about the WiFi interfaces:
<pre>
root@cl-rootfs:~# iwconfig wlan0
wlan0 IEEE 802.11abgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
</pre>
* Activate the interface:
<pre>
root@cl-rootfs:~# ifconfig wlan0 up
</pre>
* Sample WiFi scanning:
<pre>
root@cl-rootfs:~# iwlist wlan0 scan
</pre>
The output will show the list of Access Points and Ad-Hoc cells in range.
For more information about connecting to wireless networks and tuning WiFi interfaces refer to {{filename|wpa_supplicant}} and {{filename|wireless-tools}} man pages.

==== wpa_supplicant ====
* Configuration sample
Please open a {{cmd|wpa_supplicant}} configuration file bellow and put a network name and a password into the "ssid" and "psk" fields respectively.
<pre>
root@cl-rootfs:~# cat /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant

network={
ssid="wireless_network_name"
key_mgmt=WPA-PSK
psk="wireless_network_password"
}
</pre>
* Sample run
<pre>
root@cl-rootfs:~# ifconfig wlan0 up
root@cl-rootfs:~# wpa_supplicant -B -Dwext -c /etc/wpa_supplicant.conf -i wlan0
root@cl-rootfs:~# dhclient wlan0
</pre>

=== 4G/3G Cellular Modem ===
IOT-GATE-RPi is equipped with an on-board micro-SIM card socket and support cellular communication using 4G/3G cellular modem with USB interface in mini-PCIe form-factor.

{{:Transclusion: Debian: Cellular-modem-1}}
{{Note|{{filename|iot-gate-rpi_raspbian_2018-01-24.zip}} contains the package {{filename|rpi3-modem}} which takes care of all needed package installations.
When using the image burned to the eMMC provided by us, there is no need to install additional packages because {{filename|rpi3-modem}} is allready installed. In both cases continue to the [[#Loading kernel modules | Loading kernel modules]] section.}}

{{:Transclusion: Debian: Cellular-modem-2}}

=== GPIO access ===
{{:Transclusion: Debian: GPIO}}

==See also==
* [[IOT-GATE-RPi: Raspbian: Manual Installation]]
* [https://www.raspberrypi.org/downloads/ Raspberry Pi downloads]
* [http://www.debian.org/doc/manuals/reference/index.en.html Debian Reference]
* [https://wiki.debian.org/ Debian Wiki]

[[Category:Linux]]
[[Category:IOT-GATE-RPi]]

@@ Line 135: / Line 135: @@
 === GPIO access ===
 {{:Transclusion: Debian: GPIO}}
 ==See also==

IOT-GATE-RPi: Raspbian - Revision history

imported>Igor.vaisbein: /* Controller–area network (CAN) */

Rinata at 11:50, 21 March 2018