nanoDLP

amitl

Member

Registered: 2018-08-27

Posts: 17

MIPI DSI Tinkerboard/RK3288 support

Hi,

Instead of HDMI,I am using direct MIPI DSI port to run nanodlp.
To verify the hardware I run debian stretch  desktop environment to see if 2560x1440 display under X11 environment has default home page.
And yes it displays.

I then disable X11,by closing the lightdm service to make the system work headless.Then install arm version of nanodlp and verify whether the screen works.But it fails.

Before doing the test I have done required framebuffer settings in machine.json file.And also tried cat /dev/urandom > /dev/fb0
But nothing works.

Any idea what is the reason for no display.

Regards

Amit

Shahin

Administrator

Registered: 2016-02-17

Posts: 3,546

Re: MIPI DSI Tinkerboard/RK3288 support

Have you enabled framebuffer on board?
https://tinkerboarding.co.uk/wiki/index … ouchScreen

amitl

Member

Registered: 2018-08-27

Posts: 17

Re: MIPI DSI Tinkerboard/RK3288 support

Hi Shahin,

Did some test  on screen display and see that raw bmp image can be displayed properly using "cat" command but when tried to test using nanodlp the image is scattered.
Want to know in which format nanodlp send images?

Thanks & Regards

Amit

amitl

Member

Registered: 2018-08-27

Posts: 17

Re: MIPI DSI Tinkerboard/RK3288 support

Hi,

Not sure and I guess nanodlp sends image to HDMI driver in png format.But how about MIPI driver where it displays raw RGB.
Any idea on the above issue.

Thanks & Regards

Amit

Shahin

Administrator

Registered: 2016-02-17

Posts: 3,546

Re: MIPI DSI Tinkerboard/RK3288 support

All displays require RGBA format. If image scattered it could be a resolution issue, most specially wrong stride value.

amitl

Member

Registered: 2018-08-27

Posts: 17

Re: MIPI DSI Tinkerboard/RK3288 support

Is vesa framebuffer support a must for nanodlp?Any info on underlying dependencies that nanodlp needs?

Shahin

Administrator

Registered: 2016-02-17

Posts: 3,546

Re: MIPI DSI Tinkerboard/RK3288 support

No, dependency. Just you need to enter correct value for the framebuffer.

amitl

Member

Registered: 2018-08-27

Posts: 17

Re: MIPI DSI Tinkerboard/RK3288 support

Hi,

These are the test images I am getting on 1440x2560 LCD using nanodlp
1. When used setup->Projector-Calibration->Boundaries(Display)

2. This is when a slice of cube is sent

Regards

Amit