usb1_host_callback函数在哪里会被调用？

发布于 2023-07-05 12:57:20 浏览：383 订阅该版

imxrt1052-nxp-evk 板子上运行RT-Thread 4.1.0 用USB HOST读U盘，代码是用的IAR 8.4.1，同样的icf分散加载文件在FREErots下可以成功运行，RT-Thread下插拔U盘能产生中断，但是drv_usbh.c中的usb1_host_callback函数始终未被调用，是否有人遇到过同样问题。
```c
rt_thread_t usbh1_thread;

static void _ehci1_usbh_thread(void* param)
{
    while (1)
    {
        USB_HostEhciTaskFunction(imxrt_usb_host_obj[USBH1_INDEX].host_handle);
    }
}

static rt_err_t _ehci1_usbh_init(rt_device_t device)
{
    USB_HostClockInit(kUSB_ControllerEhci1);

if (kStatus_USB_Success == USB_HostInit(kUSB_ControllerEhci1, &imxrt_usb_host_obj[USBH1_INDEX].host_handle, usb1_host_callback))
    {
        usbh1_thread = rt_thread_create("ehci1", _ehci1_usbh_thread, RT_NULL, 500, 4, 9999999);
        rt_thread_startup(usbh1_thread);
        USB_HostIsrEnable(kUSB_ControllerEhci1);
    }
    else
    {
        rt_kprintf("USB_HostInit ehci1 error\r\n");
        return -RT_ERROR;
    }
    return RT_EOK;
}
```

![2023-07-05_11-10-50.jpg](https://oss-club.rt-thread.org/uploads/20230705/efe4f9010456468b03ea9406eb47b89c.jpg.webp)