STM32 F103RBT6 寻找不到CAN总线设备

发布于 2022-01-30 11:30:38 浏览：1346 订阅该版

![Inked硬件连接_LI.jpg](https://oss-club.rt-thread.org/uploads/20220130/c49b8176127fc9713346f277288fe824.jpg.webp)
如图，我的CAN收发器已经与正点原子开发板的CANTX，CANRX引脚相连，CAN收发器也与总线分析仪相连（已检查硬件连接，无问题）
与CAN设备相关代码如下
```
rt_err_t can_ret=0;
    rt_size_t size=0;
    struct rt_can_msg msg = {0};
    //can1使用PA11 PA12引脚
    can_dev = rt_device_find(CAN_DEV_NAME);
    if (can_dev == RT_NULL)
    {
        LOG_E("rt_device_find [can1] failed...\n");
        return -EINVAL;
    }
    //以中断接收及发送模式打开 CAN设备
    can_ret = rt_device_open(can_dev, RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_INT_RX);
    if (can_ret < 0)
    {
        LOG_E("rt_device_open [can1] failed...\n");
        return can_ret;
    }
    //设置 CAN 通信的波特率为 500kbit/s
    can_ret = rt_device_control(can_dev, RT_CAN_CMD_SET_BAUD, (void *)CAN500kBaud);
    //设置 CAN 的工作模式为正常工作模式
    can_ret = rt_device_control(can_dev, RT_CAN_CMD_SET_MODE, (void *)RT_CAN_MODE_NORMAL);
    //获取 CAN 总线设备的状态
    can_ret = rt_device_control(can_dev, RT_CAN_CMD_GET_STATUS, &status);
    LOG_D("can bus current status:%d",can_ret);
    msg.id = 0x78; /* ID 为 0x78 */
    msg.ide = RT_CAN_STDID; /* 标准格式 */
    msg.rtr = RT_CAN_DTR; /* 数据帧 */
    msg.len = 8; /* 数据长度为 8 */
    /* 待发送的 8 字节数据 */
    msg.data[0] = 0x00;
    msg.data[1] = 0x11;
    msg.data[2] = 0x22;
    msg.data[3] = 0x33;
    msg.data[4] = 0x44;
    msg.data[5] = 0x55;
    msg.data[6] = 0x66;
    msg.data[7] = 0x77;
    /* 发送一帧 CAN 数据 */
    size = rt_device_write(can_dev, 0, &msg, sizeof(msg));
    if (size == 0)
    {
        rt_kprintf("can_dev write data failed!\n");
    }
    return RT_EOK;
```
为什么在rt_device_find(CAN_DEV_NAME)函数就出现了问题，在之前我已经#define CAN_DEV_NAME "can1"了，控制台输出如下![控制台输出.jpg](https://oss-club.rt-thread.org/uploads/20220130/c2675cb2cadbd0db5145ed6c679e557a.jpg.webp)