Fixed ghost input tft screen by second rules

[lucableve]

I and others have experienced ghost input issues when changing the original flat cable with a longer one, causing interference with ghost inputs that lead to significant problems during printing.

The reference to the issue is here:
bigtreetech/TFT35-SPI#15

I have updated the driver, now managing the RT calculation using the second formula, which involves the use of the Y plate, implemented similarly to the X plate.

After a week of testing and various fixes, the result is stable and functional. Occasionally, ghost inputs still occur, but addressing them would likely require hardware intervention or using the penirq, also documented in the touchscreen datasheet.

[lucableve]

I stand corrected. @OstroMa points out that he is using the original cable

bigtreetech/TFT35-SPI#15 (comment)

[freakydude]

Does anyone here know if, when or how one can upstream that fix to armbian for CB1? its current stable kernel is in version 6.6. but the fix is not there. So everything on cb1 works for me but the ghost touches with the display still exist.

[bigtreetech]

Does anyone here know if, when or how one can upstream that fix to armbian for CB1? its current stable kernel is in version 6.6. but the fix is not there. So everything on cb1 works for me but the ghost touches with the display still exist.

Looking into it. Should have been there in 6.6.

[freakydude]

Does anyone here know if, when or how one can upstream that fix to armbian for CB1? its current stable kernel is in version 6.6. but the fix is not there. So everything on cb1 works for me but the ghost touches with the display still exist.

Looking into it. Should have been there in 6.6.

Great. Problems are gone with your latest cb1 image but tried the Armbian 24.8.1 Bookworm Minimal with the same machine and the ghost touches on my btt tft35 spi are back again. Also tried the official provided newer armbian kernels today - no improvement.

Thanks for looking into it.

Thanks and Best regards