[libhid-discuss] coldplug hid_interrupt_read problems

[Allen Curtis]

Hello,

I am trying to interface with a HID USB device, on the other side of a
hub. I mention the hub because this problem did not exist or was not
as pronounced in prior testing without a hub.

After power-on, I can not communicate with the device. If I hotplug
the device and restart the program it works.

I tried inserting the code as part of the initialization:
usb_clear_halt(hid->dev_handle,0x81); //if endpoint is 0x81
usb_reset(hid->dev_handle);

But it did not fix the problem. (I don't know how to get the endpoint
number either)

Is there a way to force an equivalent of a hotplug? Get the whole bus
to enumerate itself?

Any help would be appreciated.

TIA

Allen

[Allen Curtis]

False alarm!

There were two devices connected at the same time. The hotplug
operation reordered the devices and when the program was restarted,
the other device was found.

Thanks
Allen

Post by Allen Curtis
Hello,
I am trying to interface with a HID USB device, on the other side of
a hub. I mention the hub because this problem did not exist or was
not as pronounced in prior testing without a hub.
After power-on, I can not communicate with the device. If I hotplug
the device and restart the program it works.
usb_clear_halt(hid->dev_handle,0x81); //if endpoint is 0x81
usb_reset(hid->dev_handle);
But it did not fix the problem. (I don't know how to get the
endpoint number either)
Is there a way to force an equivalent of a hotplug? Get the whole
bus to enumerate itself?
Any help would be appreciated.
TIA
Allen