USB

USB通讯异常

发布于 2019-05-28 16:00:27 浏览：2502 订阅该版

10 个回答

flyboy 2019-05-29

Do my self();

木槿 2019-05-30

这家伙很懒，什么也没写！

你好，请问问题解决了吗，在检测连接的时候始终为0

```
static rt_err_t _interface_handler(ufunction_t func, ureq_t setup)
{
    struct vcom *data;

RT_ASSERT(func != RT_NULL);
    RT_ASSERT(func->device != RT_NULL);
    RT_ASSERT(setup != RT_NULL);

data = (struct vcom*)func->user_data;
    
    switch(setup->bRequest)
    {
    case CDC_SEND_ENCAPSULATED_COMMAND:
        break;
    case CDC_GET_ENCAPSULATED_RESPONSE:
        break;
    case CDC_SET_COMM_FEATURE:
        break;
    case CDC_GET_COMM_FEATURE:
        break;
    case CDC_CLEAR_COMM_FEATURE:
        break;
    case CDC_SET_LINE_CODING:
        _cdc_set_line_coding(func->device, setup);
        break;
    case CDC_GET_LINE_CODING:
        _cdc_get_line_coding(func->device, setup);
        break;
    case CDC_SET_CONTROL_LINE_STATE:
        data->connected = (setup->wValue & 0x01) > 0?RT_TRUE:RT_FALSE;
        RT_DEBUG_LOG(RT_DEBUG_USB, ("vcom state:%d \n", data->connected));
        dcd_ep0_send_status(func->device->dcd);
        break;
    case CDC_SEND_BREAK:
        break;
    default:
        rt_kprintf("unknown cdc request\n",setup->request_type);
        return -RT_ERROR;
    }

return RT_EOK;
}
```