【完美体育·（中国）手机网页版MYD-Y6ULX-V2开发板】CAN自动发送数据

由评测者“华仔stm32”提供。

前面实现了手工用CAN发送数据的测试，下面用C编程来发送数据。
1、新建can.c:

#include  #include  #include  #include  #include  #include  #include  #include  #include  int main(int argc, char const *argv[]) { int s, nbytes; struct sockaddr_can addr; struct ifreq ifr; struct can_frame frame[2] = {{0}};
    s = socket(PF_CAN, SOCK_RAW, CAN_RAW); if (s == -1){ printf("open can error!"); return -1;
    } 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)); //禁用过滤规则，本进程不接收报文，只负责发送 setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0);
    frame[0].can_id = 0x11;
    frame[0].can_dlc = 1;
    frame[0].data[0] = 0x11;
    frame[1].can_id =0x22;
    frame[1].can_dlc = 1;
    frame[1].data[0] = 0x22; while(1)
    {
        nbytes = write(s, &frame[0], sizeof(frame[0])); if(nbytes != sizeof(frame[0]))
        { printf("Send Error frame[0]!\n"); break;
        } sleep(1);
        nbytes = write(s, &frame[1], sizeof(frame[1])); if(nbytes != sizeof(frame[1]))
        { printf("Send Error frame[1]!\n"); break;
        } sleep(1);
    } close(s); return 0;
} 

交叉编译后上传给开发板，打开CAN分析仪。开发板上手工开启can0:

root@myd-y6ull14x14:~# ip link set can0 type can bitrate 500000 

root@myd-y6ull14x14:~# ifconfig can0 up 

[ 3303.387293] IPv6: ADDRCONF(NETDEV_CHANGE): can0: link becomes ready 

运行cat_test_send: