Issues relating to Genesys Logic GL864A custom firmware for OV5640 module and Linux UVC driver
Linux raspberrypi 4.4.50+ #970 Mon Feb 20 19:12:50 GMT 2017 armv6l GNU/Linux
Distributor ID: Raspbian Description: Raspbian GNU/Linux 8.0 (jessie) Release: 8.0 Codename: jessie
This does seem to fix the low frame rate bug. I have been able to record at 30fps. However the difficulty of connecting to the video device continues. Even Windows 10 does not pick up on the camera now.
This version has has moved us forward from generally unusable with Linux to being usable under certain conditions. However some issues remain that we really must resolve before we can signoff.
Found that this worked with Windows 10, but could only be made to work very infrequently with Linux. Some sort of timeout error happening during the initial setup of the video connection.
We are still experiencing connection problems to the camera. When using a slower CPU (a Raspberry Pi Compute Module 1) this works typically in one or two tries. On the newer faster Raspberry Pi Compute Module 3 it can be made to work very rarely (maybe on in 20 or 30 tries).
Researching problems with Linux + UVC cameras a common cause of problems is missing UVC functionality. We ran the official USB2 tests on the GL864 firmware and compared with the GL864 Eval Board. Our firmware failed, but the eval board passed. I suspect this may be the root cause of the reliability problems.
These are the rest reports:
- UVC Functionlity Test FW_20171030 GL864A PID 0x0510
- UVC Functionlity Test FW 20171030 GL864A PID 0x0515
- UVC Functionlity Test Eval Board
The errors seem to indicate that some mandatory services are missing. These are:
- Video Control does not support the mandatory request : SET_CUR
- Video Control does not support the mandatory request : GET_RES
- Video Control does not support the mandatory request : GET_INFO
- Video Control does not support the mandatory request : GET_DEF
(see reports above for details).
The firmware on the GL864 eval board does pass all the tests (report also linked above).
We are seeing something in the order of 3 to 4 frames per second. This has been observed on Windows 10.
The following is not a very scientific test, but it does show we are seeing a rather slow frame rate. The following are 4 frames in sequence (omitting duplicated frames, because Zoom Meeting recorded from screen at a sometime like 30 frames per second). As can be seen there is a substantial gap in time between differing frames.
