Hi,
I tried to access controls on the second extension unit by UVCIOC_CTRL_ADD, but
they all failed with error code 1
For example, for the fist control:
// These settings are common to all XU Controls...
memcpy(ci.entity, EXT_UNIT_GUID, GUID_SIZE);
ci.size = 2;
ci.flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR;
ci.index = 1;
ci.selector =1;
if (xioctl(hCamera, UVCIOC_CTRL_ADD, &ci) == -1)
{
if (errno != 17)
{
CLogStream::LogErrorMessage("MapExtUnitControls Failed!.", errno);
}
//return -1;
}
Getting or setting this first control is ok. But failed on other controls.
By dmesg, it shows:
[28045.674782] uvcvideo: uvc_v4l2_ioctl(unknown ioctl 'U', dir=rw, #3
(0xc0085503))
[28045.675530] uvcvideo: uvc_v4l2_ioctl(unknown ioctl 'U', dir=rw, #3
(0xc0085503))
[28045.675540] uvcvideo: Control 2812ae3f-bcd7-4e11-a357-6f1edef7d61d/2 not
found.
[28045.675987] uvcvideo: uvc_v4l2_ioctl(unknown ioctl 'U', dir=rw, #3
(0xc0085503))
[28045.675999] uvcvideo: Control 2812ae3f-bcd7-4e11-a357-6f1edef7d61d/5 not
found.
[28045.676348] uvcvideo: uvc_v4l2_ioctl(unknown ioctl 'U', dir=rw, #3
(0xc0085503))
[28045.676359] uvcvideo: Control 2812ae3f-bcd7-4e11-a357-6f1edef7d61d/3 not
found.
May I know why? Is there any flag I need turn on? Please help!
Daniel Zhang
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