Re: kvaser leaf and SocketCAN

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 04/30/2015 08:14 AM, Leo Stan wrote:
> 
> Actually I spoke too soon...
> 
> When I try this simple code from the documentation :
> 
> 
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <string.h>
>  
> #include <net/if.h>
> #include <sys/types.h>
> #include <sys/socket.h>
> #include <sys/ioctl.h>
>  
> #include <linux/can.h>
> #include <linux/can/raw.h>
>  
> int main(void)
> {
> 	int s;
> 	int nbytes;
> 	struct sockaddr_can addr;
> 	struct can_frame frame;
> 	struct ifreq ifr;
>  
> 	char *ifname = "can0";
>  
> 	if((s = socket(PF_CAN, SOCK_RAW, CAN_RAW)) < 0) {
> 		perror("Error while opening socket");
> 		return -1;
> 	}
>  
> 	strcpy(ifr.ifr_name, ifname);
> 	ioctl(s, SIOCGIFINDEX, &ifr);
>  
> 	addr.can_family  = AF_CAN;
> 	addr.can_ifindex = ifr.ifr_ifindex; 
>  
> 	printf("%s at index %d\n", ifname, ifr.ifr_ifindex);
>  
> 	if(bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
> 		perror("Error in socket bind");
> 		return -2;
> 	}
> 
> 	// Reading the CAN port
> 
> 
> 	nbytes=read(s,&frame,sizeof(struct can_frame));
> 
> 	if (nbytes < 0) {
>             perror("can raw socket read");
>             return 1;
>         }
> 
>         /* paranoid check ... */
>         if (nbytes < sizeof(struct can_frame)) {
>             fprintf(stderr, "read: incomplete CAN frame\n");
>             return 1;
>         }
> 
>         printf("dlc = %d, data = %s, %d bytes read\n", 
> frame.can_dlc,frame.data,nbytes);
> 
>         close(s);
> 	
>         return 0;
> }
> 
> I get this flag :
> 
> can0 at index 3
> can raw socket read: Network is down
                       ^^^^^^^^^^^^^^^
You have to configure your CAN network device first, then bring it into
an operational state, this means the network is "up".

    ip link set can0 type can bitrate 500000
    ip link set can0 up

See section "6.5.1 Netlink interface to set/get devices properties"
http://lxr.free-electrons.com/source/Documentation/networking/can.txt#L990

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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