需要获取指定帧id
时间: 2023-11-25 15:05:48 浏览: 22
如果你需要获取指定帧ID的CAN数据,可以在循环接收CAN数据帧之前,使用setsockopt()函数设置过滤规则,只接收指定ID的CAN数据。以下是一个简单的示例程序:
```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 argc, char **argv)
{
int s;
struct sockaddr_can addr;
struct ifreq ifr;
struct can_frame frame;
struct can_filter rfilter[1];
// 创建socketCAN套接字
if ((s = socket(PF_CAN, SOCK_RAW, CAN_RAW)) < 0) {
perror("socket");
return -1;
}
// 指定can0接口
strcpy(ifr.ifr_name, "can0");
ioctl(s, SIOCGIFINDEX, &ifr);
// 绑定can0接口
addr.can_family = AF_CAN;
addr.can_ifindex = ifr.ifr_ifindex;
if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("bind");
return -1;
}
// 设置过滤规则,只接收ID为0x123的CAN数据帧
rfilter[0].can_id = 0x123;
rfilter[0].can_mask = CAN_SFF_MASK;
setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, &rfilter, sizeof(rfilter));
// 循环接收指定ID的CAN数据帧
while (1) {
if (read(s, &frame, sizeof(frame)) < 0) {
perror("read");
return -1;
}
if (frame.can_id == 0x123) {
printf("ID=0x%x 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");
}
}
// 关闭套接字
close(s);
return 0;
}
```
该程序使用setsockopt()函数设置过滤规则,只接收ID为0x123的CAN数据帧,然后在循环接收CAN数据帧时,只处理ID为0x123的CAN数据帧,忽略其他CAN数据。