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Forum Index : Microcontroller and PC projects : Question regarding RP2350 with PSRAM
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| dddns Guru  Joined: 20/09/2024 Location: GermanyPosts: 379 |
This question is regarding HDMI and I do not want to spam another thread: Is it possible to increase the color depth in the current HDMI modes while leaving the clockrate unchanged? Is it just a question of RAM amount? What is the future plan? I'm asking because I would of cause not hesitate to exchange my ssd1963 LCD against an IPS panel with the size of my choice if it would be possible and implemented.. ..I would like to know to have a plan for myself on how to go on further. Of cause everybody is invited to answer (the main question)! |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10089 |
No: PSRAM isn't fast enough to use as a framebuffer |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3326 |
Deleted--posted in wrong thread. Edited 2025-03-01 05:50 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| dddns Guru Joined: 20/09/2024 Location: GermanyPosts: 379 |
Thank you, I think I got it. The physical framebuffer which delivers the actual picture is realized with the RAM of the pico and processed through the pico in contrast to LCD, where this job is done by the display controller and the internal RAM. |
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| dddns Guru Joined: 20/09/2024 Location: GermanyPosts: 379 |
Never the less PSRAM would be fast enough to have 25frames/s at about 160x96 in rgb888 on the ssd. That's almost the size ov7670 delivers. So a "videoeditor.bas" with the option of creating a video with live pictures is not unthinkable :) I mean with only the use of the blit command. Edited 2025-03-01 06:21 by dddns |
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| dddns Guru Joined: 20/09/2024 Location: GermanyPosts: 379 |
Wrong nonsense, sorry. I found, that only a rp2350 with 8Mb PSRAM and an ILI9341 LCD will be enough, to have roundabout amazing 2.5seconds of 240*130 RGB888 fully flicker free video sequence in 25 frames/s! This is possible already for months since the implementation of PSRAM. I saw trees, but not the forest. Edited 2025-03-02 03:32 by dddns |
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| dddns Guru Joined: 20/09/2024 Location: GermanyPosts: 379 |
I did a proof of concept and have a 1,3sec sequence running only by using blit. There is a command "blit,x,y,x1,y1,w,h" but sadly only to copy content within the physical screen. Copying between blit buffers seems to be not possible. |
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| dddns Guru Joined: 20/09/2024 Location: GermanyPosts: 379 |
Sample of reading 32 blits of 260x190(that's max for 9341@25frames/s) extracted .bmp frames and then displaying them in 32/25 = 1.28sec length clip on a PGA2350 and ILI9341. Memory shows: > memory Program: 1K ( 1%) Program (37 lines) 255K (99%) Free Saved Variables: 16K (100%) Free RAM: 1K ( 0%) 5 Variables 4632K (71%) General 1815K (29%) Free so there is some space left but the blit slots are saturated. I think it would be a real valuable improvement for everyone using LCDs, to increase the number of available blit slots and to extend the existing blit x1,y1,x2,y2,w,h with parameters for source and destination. Beside just playing a sequence as video, it would be easily possible to generate amazing effects like let a photo realistic man walk through the picture or a digital picture frame with nice animations. ILI9341.mp4.zip |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4918 |
Hi dddns, Look at "blit memory". Volhout PicomiteVGA PETSCII ROBOTS |
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| dddns Guru Joined: 20/09/2024 Location: GermanyPosts: 379 |
Did not try that yet as I read the manual and thought, that it is only rgb121 Will do :) |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4918 |
Blit memory may be "tricked" into doing what you want. If you just need to copy blocks of memory, use "memory copy". Volhout PicomiteVGA PETSCII ROBOTS |
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