<linux/can.h>有哪些语句
时间: 2024-04-30 13:23:19 浏览: 11
这里列出了一些常用的语句:
1. 定义CAN消息的数据结构
```
struct can_frame {
canid_t can_id; // CAN消息的ID
__u8 can_dlc; // CAN消息的数据长度
__u8 data[8]; // CAN消息的数据内容
};
```
2. 定义CAN过滤器的数据结构
```
struct can_filter {
canid_t can_id; // CAN消息的ID
canid_t can_mask; // CAN过滤器的掩码
};
```
3. 打开CAN设备
```
int socket_can = socket(PF_CAN, SOCK_RAW, CAN_RAW);
```
4. 绑定CAN设备
```
struct sockaddr_can addr;
addr.can_family = AF_CAN;
addr.can_ifindex = ifr.ifr_ifindex;
bind(socket_can, (struct sockaddr *)&addr, sizeof(addr));
```
5. 设置CAN过滤器
```
struct can_filter rfilter[1];
rfilter[0].can_id = 0x123; // 过滤CAN ID为0x123的消息
rfilter[0].can_mask = CAN_SFF_MASK;
setsockopt(socket_can, SOL_CAN_RAW, CAN_RAW_FILTER, &rfilter, sizeof(rfilter));
```
6. 发送CAN消息
```
struct can_frame frame;
frame.can_id = 0x123; // CAN消息的ID
frame.can_dlc = 4; // CAN消息的数据长度
frame.data[0] = 0x11; // CAN消息的数据内容
frame.data[1] = 0x22;
frame.data[2] = 0x33;
frame.data[3] = 0x44;
write(socket_can, &frame, sizeof(frame));
```
7. 接收CAN消息
```
struct can_frame frame;
read(socket_can, &frame, sizeof(frame));
```