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+====== SocketCAN ======
+[[:english|{{ :rocrail-logo-35.png}}]]
+[[:cbus:overview-en|{{ icons:uk.png}}]][[:cbus:overview-de|{{ icons:de.png}}]][[:cbus:overview-fr|{{ icons:fr.png}}]]
+[[:english|Content]] -> [[:hardware-en|Hardware]] -> [[:hardware-en#gca-cbus|CANBUS]]
+  * [[:cbus:overview-en|CAN-GC Overview]]
+  * [[:cbus:overview-en#bus_termination|CAN Bus termination]]
+ \\
+//[[https://en.wikipedia.org/wiki/SocketCAN|"SocketCAN is a set of open source CAN drivers and a networking stack contributed by Volkswagen Research to the Linux kernel."]]// \\
+ \\
+=====Introduction=====
+The __**[[:rocnet:pi01can-en|Pi01CAN]]**__ MCP251x Interface board needs a Raspberry Pi 2/3/4 with [[https://www.raspberrypi.org/downloads/|PiOS 32bit or 64bit]].((https://www.raspberrypi.org/forums/viewtopic.php?f=117&t=275370))\\
+SocketCAN is only available if the Rocrail server runs on the same Raspberry Pi with the PiCAN on it.\\
+The communication with RCAN((Supports also CBUS)) is direct and binary; No bidirectional conversion needed between the MERG Gridconnect ASCII framing.\\
+The 12VDC power supply for the connected CANGC* units can be provided wit a __**[[:gca08-en|GCA-08]]**__. See __**[[:cbus:overview-en#connection_cable|Cable connections]]**__ for more information.\\
+ \\
+=====Documentation=====
+  * https://en.wikipedia.org/wiki/SocketCAN (EN)
+  * https://de.wikipedia.org/wiki/SocketCAN (DE)
+ \\
+===== Pi01CAN Interface =====
+  * **[[:rocnet:pi01can-en|PiCAN-01]]**
+[[:rocnet:pi01can-en|{{:rocnet:pi01can.jpg?400}}]]\\
+//The I2C parts can be left out If the RocNet connection is not needed. (Just write a remark in case its ordered at GCA.)//\\
+ \\
+=====Raspi Setup=====
+====config.txt====
+Modify the following file as super user, sudo, with a text editor of your choice.\\
+**/boot/config.txt**
+Remove the comment '#' from this line:\\
+//before modify//
+<code>
+#dtparam=spi=on
+</code>
+//after modify//
+<code>
+dtparam=spi=on
+</code>
+Add the following lines to the end of this file:
+<code>
+dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25
+dtoverlay=spi-bcm2835-overlay
+</code>
+====Reboot====
+<code>
+sudo shutdown -r now
+</code>
+====interfaces====
+Modify the following file as super user, sudo, with a text editor of your choice.\\
+**/etc/network/interfaces**\\
+Add the following lines to the end of this file: (The comment line '#' is optional.)
+<code>
+# CAN Interface
+auto can0
+iface can0 inet manual
+        pre-up /sbin/ip link set $IFACE type can bitrate 125000 restart-ms 100
+        up /sbin/ifconfig $IFACE up
+        down /sbin/ifconfig $IFACE down
+</code>
+//If the Pi-CAN should be used with MBUS, the bitrate must be set to 250000.//\\
+:!: **Note:** On newer PiOS versions add a file named /etc/network/interfaces.d/can0 with the content from above.\\
+====Check====
+<code>
+dmesg | egrep -i "can|spi"
+[    3.998382] CAN device driver interface
+[    4.051102] mcp251x spi0.0 can0: MCP2515 successfully initialized.
+</code>
+ \\
+===== Rocrail Setup =====
+{{:cbus:rcan-setup-en.png}}\\
+  * Select type SocketCAN
+  * Set Hostname(device name) to **can0** (If not set: can0 will be used.)
+====Check the device name====
+Check the device name by using the command **ifconfig** on the Raspberry Pi:
+<code>
+pi@keltenbahn:~ $ ifconfig
+can0: flags=193<UP,RUNNING,NOARP>  mtu 16
+        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 10  (UNSPEC)
+        RX packets 0  bytes 0 (0.0 B)
+        RX errors 0  dropped 0  overruns 0  frame 0
+        TX packets 0  bytes 0 (0.0 B)
+        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
+</code>
+ \\
+===== CANService =====
+As alternative to running Rocrail on the Raspberry Pi, it is also possible to use the __**[[:mbus:canservice-en|CANService]]**__.\\
+It behaves like a GC1e.\\
+ \\
+===== Alternative CAN Board =====
+This low-cost //[[https://www.az-delivery.de/en/products/mcp2515-can-bus-modul|AZDelivery MCP2515 CAN Bus Shield]]// can be used as alternative if only CAN is needed:\\
+{{:cbus:mcp2515_can_bus_modul_pinout.jpg?400}}\\
+The Raspberry __[[#raspi_setup|Software Setup]]__ is the same as for the Pi01-CAN, except for the oscillator:
+<code>
+oscillator=8000000
+</code>
+Check the board which frequency the crystal has printed on it:\\
+{{:cbus:azdelivery-canshield.jpg?200}}\\
+This example shows 8000 kHz -> 8000000 Hz\\
+For CAN speeds above 125kHz it is recommended to replace this crystal with a [[https://www.reichelt.de/standardquarz-grundton-16-mhz-iqd-lfxtal003240-p245409.html?search=16+mhz|16MHz type]]. (oscillator=16000000)\\
+\\
+|< >|
+|  Wiring  ||||
+^ Shield ^ Rpi ^ Rpi Pin number(s) ^ Remark ^
+| VCC | 5V |  2, 4  | With 3V3 it will receive, but cannot send CAN packets. |
+| GND | Masse (Ground) |  6, 9, 20, 25, 30, 34, 39  |
+| CS | GPIO 8 (CE0) |  24  |
+| SO | GPIO 9 (MISO) |  21  |
+| SI | GPIO 10 (MOSI) |  19  |
+| SCK | GPIO 11 (SCLK) |  23  |
+| INT | GPIO 25 |  22  |
+**Notes:**
+  * This board is __not isolated__. (ISO1050)
+  * A ground connection on the screw terminal is missing, and it is __strongly recommended to connect the ground__ of the CAN cable to the GND pin of this board to avoid static voltage which could destroy the electronics.