Mem: 32336K used, 204116K free, 0K shrd, 1568K buff, 6260K cached
CPU: 0% usr 21% sys 0% nic 35% idle 0% io 0% irq 42% sirq
Load average: 0.03 0.04 0.05 1/58 1009
PID PPID USER STAT VSZ %MEM %CPU COMMAND
1008 951 root R 1472 1% 44% ./a.out
622 2 root SW 0 0% 6% [kworker/0:2]
644 2 root SW 0 0% 1% [ksdioirqd/mmc1]
1009 951 root R 2844 1% 1% top
45 2 root SW 0 0% 0% [irq/74-serial i]
951 949 root S 2844 1% 0% -sh
924 1 root S 2732 1% 0% /sbin/syslogd -n -C64 -m 20
926 1 root S 2668 1% 0% /sbin/klogd -n
917 1 root S 2668 1% 0% /usr/sbin/telnetd
912 1 messageb S 2436 1% 0% /usr/bin/dbus-daemon --system
949 1 root S 2400 1% 0% login -- root
692 1 root S < 2188 1% 0% /sbin/udevd -d
726 692 root S < 2184 1% 0% /sbin/udevd -d
727 692 root S < 2184 1% 0% /sbin/udevd -d
933 1 root S 2064 1% 0% /usr/sbin/thttpd -d /srv/www -p 8080 -
1 0 root S 1628 1% 0% init [5]
588 2 root SW 0 0% 0% [w1_bus_master1]
5 2 root SW 0 0% 0% [kworker/u:0]
633 2 root SW 0 0% 0% [mmcqd/0]
3 2 root SW 0 0% 0% [ksoftirqd/0]

root@am3517-evm:~# cat /proc/interrupts ; ifconfig
CPU0
11: 0 INTC prcm
12: 1873 INTC DMA
20: 0 INTC gpmc
24: 12114477 INTC can0
25: 2 INTC OMAP DSS
37: 454780 INTC gp timer
56: 1874385 INTC omap_i2c
57: 0 INTC omap_i2c
58: 84972 INTC omap_hdq
61: 0 INTC omap_i2c
71: 1 INTC musb-hdrc.0
72: 0 INTC serial idle
73: 0 INTC serial idle
74: 22509 INTC serial idle, OMAP UART2
77: 0 INTC ehci_hcd:usb2
83: 2765 INTC mmc0
86: 286560 INTC mmc1
160: 0 GPIO tps6507x
162: 1 GPIO mmc1
184: 0 GPIO ds1374
186: 0 GPIO tca8418-keypad
224: 0 GPIO mmc0
Err: 0

can0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
UP RUNNING NOARP MTU:16 Metric:1
RX packets:12732263 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:88788609 (84.6 MiB) TX bytes:0 (0.0 B)
Interrupt:24

1 #include <stdio.h>
2 #include <sys/types.h>
3 #include <sys/socket.h>
4 #include <sys/ioctl.h>
5 #include <net/if.h>
6
7 #include <linux/can.h>
8 #include <linux/can/raw.h>
9 #include <string.h>
10
11 /* At time of writing, these constants are not defined in the headers */
12 #ifndef PF_CAN
13 #define PF_CAN 29
14 #endif
15
16 #ifndef AF_CAN
17 #define AF_CAN PF_CAN
18 #endif
19
20 int main(int argc, char *argv[])
21 {
22 /* create a frame */
23 struct can_frame frame;
24 /* interface */
25 struct ifreq ifr;
26 /* number of te */
27 int bytes_read;
28 /* create the socket */
29 int skt = socket( PF_CAN, SOCK_RAW, CAN_RAW );
30 /* socket address */
31 struct sockaddr_can addr;
32 /* counter SFF */
33 unsigned long countSFF;
34 /* counter EFF*/
35 unsigned long countEFF;
36
37 countSFF = 0;
38 countEFF = 0;
39 /* locate the interface you wish to use */
40 strcpy( ifr.ifr_name, "can0" );
41 ioctl( skt, SIOCGIFINDEX, &ifr ); /* ifr.ifr_ifindex gets filled with that device's index */
42 /* select that CAN interface, and bind the socket to it. */
43 addr.can_family = AF_CAN;
44 addr.can_ifindex = ifr.ifr_ifindex;
45 bind( skt, ( struct sockaddr * ) &addr, sizeof( addr ) );
46 while(1)
47 {
48 bytes_read = read( skt, &frame, sizeof( frame ) );
49 if( bytes_read < 0 )
50 {
51 printf( "CAN\n" );
52 }
53 else if ( bytes_read > 0 )
54 {
55 if( !( frame.can_id & 0x80000000U ) )
56 {
57 countSFF++;
58 }
59 else
60 {
61 countEFF++;
62 }
63 }
64 }
65
66 return 0;
67 }