Closed Jabberwacky closed 5 years ago
juj
commented
5 years ago I think here fbcp-ili9341 is adapting aspect ratio to the source, i.e. 640x480 has aspect ratio of 4:3, so the output image is also given an aspect ratio of 4:3. You can use the -DDISPLAY_BREAK_ASPECT_RATIO_WHEN_SCALING=ON setting to perform aspect-ratio free scaling, or alternatively set up in /boot/config.txt a HDMI resolution that is square, like 640x640 or 480x480, or 128x128.
Jabberwacky
commented
5 years ago Thank you. /boot/config.txt I had already tested. It can set just several predefined resolutions. And will reject something else. Even when I am using hdmi_cvt commands. This string DDISPLAY_BREAK_ASPECT_RATIO_WHEN_SCALING=ON did not changed nothing. Searching solutions for aspect ratio. Will report
Jabberwacky
commented
5 years ago "-DDISPLAY_CROPPED_INSTEAD_OF_SCALING=ON .." This shows me cropped but correct fonts. Will try to change HDMI somehow
Jabberwacky
commented
5 years ago This issue was solved with help of your suggestion. I have some other questions. I got some troubles with starting driver in autostart mode. And I still unable to show video. I can see the mess of dots, or a regular white screen instead of picture, when starting to use omxplayer. There is some DMA access troubles. But this is out from theme of this issue. Thank you for your great work!!!
juj
commented
5 years ago Omxplayer seems to use DMA transfers on its own, which collides with fbcp-ili9341s use of DMA. You can try finding other DMA channel numbers for fbcp-ili9341 to use to see if the channel collision can be avoided. Be careful though, SD card also uses DMA, so if you use its DMA channel, it may corrupt the contents of the card, so backup is advised.
Jabberwacky
commented
5 years ago Thank you very much! I'll try to use raspivid instead. This is a goal of my device - to show the camera output. :))) And some additional info as a text
The system is: Machine model: Raspberry Pi Zero Rev 1.3 Linux version 4.14.83+ (dom@dom-XPS-13-9370) - some Raspbian.
Display started to work in a 128x98 SSD1351 configuration. I even changed the resolution to 128x128 in ssd1351.h file. BUT it still "GPU grab rectangle is offset x=0,y=0, size w=128xh=96, aspect ratio=1.333333" So the screen shows me very distorted pictures. Where i can tune it up? I can't find. The display itself is Ok. I tested it with Luma Python libs. They are very slow. Thanx in advance!
P.S. "source display area size with overscan cropped away: 640x480" P.P.S. cmake string is "-DGPIO_TFT_DATA_CONTROL=24 -DSPI_BUS_CLOCK_DIVISOR=18 -DSSD1351=ON -DSINGLE_CORE_BOARD=ON -DGPIO_TFT_RESET_PIN=25 -DSTATISTICS=0 -DUSE_DMA_TRANSFERS=ON .."