socketcan过滤代码
时间: 2023-07-23 15:57:18 浏览: 124
can_vt-v1.0.zip
以下是一个示例的SocketCAN过滤代码,它使用了SocketCAN的API来设置过滤规则:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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()
{
int s;
struct sockaddr_can addr;
struct ifreq ifr;
struct can_filter rfilter[1];
// 创建SocketCAN套接字
s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
if (s == -1) {
perror("socket");
return -1;
}
// 设置CAN接口名称,例如"can0"
strcpy(ifr.ifr_name, "can0");
ioctl(s, SIOCGIFINDEX, &ifr);
// 设置地址信息
addr.can_family = AF_CAN;
addr.can_ifindex = ifr.ifr_ifindex;
// 绑定SocketCAN套接字到指定的CAN接口
if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
perror("bind");
close(s);
return -1;
}
// 设置过滤规则 (仅接收ID为0x123的CAN帧)
rfilter[0].can_id = 0x123; // 过滤的CAN ID
rfilter[0].can_mask = CAN_SFF_MASK; // 接收的CAN帧ID掩码
// 应用过滤规则
setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, &rfilter, sizeof(rfilter));
// 接收CAN帧
while (1) {
struct can_frame frame;
int nbytes;
nbytes = read(s, &frame, sizeof(struct can_frame));
if (nbytes < 0) {
perror("read");
break;
}
// 处理接收到的CAN帧数据
// ...
printf("Received CAN frame: ID=0x%03X, DLC=%d, Data=", frame.can_id, frame.can_dlc);
for (int i = 0; i < frame.can_dlc; i++) {
printf("%02X ", frame.data[i]);
}
printf("\n");
}
// 关闭SocketCAN套接字
close(s);
return 0;
}
```
这段代码创建了一个SocketCAN套接字并绑定到指定的CAN接口,然后设置了一个过滤规则,仅接收CAN ID为0x123的帧。在主循环中,它不断地从套接字读取CAN帧数据,并对其进行处理。请根据实际需要修改和扩展代码。
阅读全文