Kontron KTAM3874-pITX - Manual (Page 75)

KTD-S0057-I Page 71 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
10.8 CAN Bus Examples
10.8.1 CAN Loopback Test Utility
The following picture shows a simple wiring plan for the loopback test. With very short cables you need no
termination resistors.
It is possible that the program does not work correctly after start-up. In this case you should execute the
commands below (naturally you can use another baudrate than 125 kBaud):
sudo ifconfig can0 down
sudo ifconfig can1 down
sudo ip link set can0 up type can bitrate 125000
sudo ip link set can1 up type can bitrate 125000
Further details about CAN bus and socket programming is available on https://www.kernel.org/doc/Docu-
mentation/networking/can.txt and also on http://www.can-cia.org/fileadmin/cia/files/icc/13/hartkopp.pdf .
As an exception this program can run with user and root rights (compiled on Ubuntu TM distribution).
/* CAN bus test program
* Copyright (c) 2013 Kontron Technology A/S
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
*/
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>