直接返回 -EINVAL,而对比isoc传输stream on时是UVC_STATE_CONNECTED状态,然后通过连接不同host的log对比发现bulk模式连接 Android设备上的时候就会走了1次 uvc_function_set_alt,然后stream on时又会执行一次, 此时就已经把 uvc->state 改成了 UVC_STATE_STREAMING:...
Refer to USB 2.0 spec, if a transfer with size divisible to EPs max packet size and with req->zero field is set, which means that after data is transfered it is also should be transfered a zero length packet at the end. For uvc bulk in transfer, it only sets the req->zero flag...
Please refer to Interrupt/Bulk Endpoint Operational Model in i.MX7D reference manual for details regarding bulk transfers. You can also check the <kernel_src>/Documentation/usb/ehci.txt and <kernel_src>/include/linux/usb/gadget.h for more reference. Regards, Karan Gajjar 1 Kudo Reply Post ...
1、打开内核相关配置 CONFIG_VIDEO_V4L2_SUBDEV_API=y CONFIG_MEDIA_USB_SUPPORT=y CONFIG_MEDIA_CONTROLLER=y CONFIG_USB_VIDEO_CLASS=y CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV=y CONFIG_V4L_PLATFORM_DRIVERS=y CONFIG_MEDIA_CAMERA_SUPPORT=y CONFIG_VIDEO_DEV=y CONFIG_USB_CONFIGFS_F_UVC=y 2、安装uvc-gad...
Usage: ./uvc-gadget [options] Available options are -b Use bulk mode -d Do not use any real V4L2 capture device -f <format> Select frame format 0 = V4L2_PIX_FMT_YUYV 1 = V4L2_PIX_FMT_MJPEG -h Print this help screen and exit -i image MJPEG image -m Streaming mult for ISOC (b...
unsigned int bulk; uint8_t color; unsigned int imgsize; void *imgdata; }; static struct uvc_device * uvc_open(const char *devname) { struct uvc_device *dev; struct v4l2_capability cap; int ret; int fd; fd = open(devname, O_RDWR | O_NONBLOCK); if (fd == -...
can be used and each use-case can vary in the following ways: - Video streaming endpoint choice: --- As per UVC specifications (Revision 1.1), either Bulk or Isochronous USB endpoints can be used are for implementing UVC Video streaming interface. Both have there unique challenges as: Isochr...
As per UVC specifications (Revision 1.1), either Bulk or Isochronous USB endpoints can be used are for implementing UVC Video streaming interface. Both have there unique challenges as: Isochronous video streaming interface will have two alt-settings: - Alt-setting 0 for zero-bandwidth mode, and ...
Function-specific configfs interface --- The function name to use when creating the function directory is "Loopback". The LOOPBACK function provides these attributes in its function directory: qlen - depth of loopback queue bulk_buflen - buffer length Testing the LOOPBACK function --- device:...
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