socketcan设置过滤,接收ID低16位的高八位为0xE1的扩展数据帧
时间: 2024-03-11 12:49:29 浏览: 15
要在SocketCAN上设置过滤,可以使用setsockopt()函数进行设置。以下是设置接收ID低16位的高八位为0xE1的扩展数据帧的示例代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/can.h>
#include <linux/can/raw.h>
int main() {
int s;
struct sockaddr_can addr;
struct ifreq ifr;
struct can_filter filter[1];
// 打开socket,并绑定到can0
s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
strcpy(ifr.ifr_name, "can0");
ioctl(s, SIOCGIFINDEX, &ifr);
addr.can_family = AF_CAN;
addr.can_ifindex = ifr.ifr_ifindex;
bind(s, (struct sockaddr *)&addr, sizeof(addr));
// 设置过滤规则
filter[0].can_id = 0xE1000000;
filter[0].can_mask = 0xFFFF0000;
setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, &filter, sizeof(filter));
// 接收数据
struct can_frame frame;
while (1) {
int nbytes = read(s, &frame, sizeof(struct can_frame));
if (nbytes > 0) {
printf("Received a frame with ID: 0x%X\n", frame.can_id);
// 处理数据
}
}
return 0;
}
```
上述代码中,setsockopt()函数的第三个参数为CAN_RAW_FILTER,用于设置过滤规则。filter[0].can_id表示要接收的ID,0xE1000000表示扩展ID的高8位为0xE1,filter[0].can_mask表示掩码,0xFFFF0000表示只匹配ID的低16位和扩展ID的高8位,其它位不匹配。在接收数据时,只有符合过滤规则的数据才会被接收。