首先附上can的接收程序：
/* 2. 报文过滤接收程序 */
#include
#include
#include
#include
#include
#include
#include
#include
#include
int main()
{
int s, nbytes;
struct sockaddr_can addr;
struct ifreq ifr;
struct can_frame frame;
struct can_filter rfilter[1];
s = socket(PF_CAN, SOCK_RAW, CAN_RAW); //创建套接字
strcpy(ifr.ifr_name, "can0" );
ioctl(s, SIOCGIFINDEX, &ifr); //指定 can0 设备
addr.can_family = AF_CAN;
addr.can_ifindex = ifr.ifr_ifindex;
bind(s, (struct sockaddr *)&addr, sizeof(addr)); //将套接字与 can0 绑定
//定义接收规则，只接收表示符等于 0x11 的报文
rfilter[0].can_id = CAN_EFF_FLAG | 0x0cf11f05 ;
rfilter[0].can_mask = CAN_SFF_MASK;
//设置过滤规则
setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, &rfilter, sizeof(rfilter));
while(1)
{
nbytes = read(s, &frame, sizeof(frame)); //接收报文
//显示报文
if(nbytes > 0)
{
printf(“ID=0x%X DLC=%d data[0]=0x%X\n”, frame.can_id,
frame.can_dlc, frame.data[0]);
}
}
close(s);
return 0;
}
在这个程序中接收的扩展帧ID是0x0cf11f05，我把这个交叉编译放在IMX6Q开发板（跑的Linux系统）上运行，通过周立功的cantest软件发送can报文，板子上接收的ID显示为8x0cf11f05，显示不正确，有谁知道原因吗？下图是结果截图：
