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Xinyuan-LilyGO / T-Display-S3-Long

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AXS15231B datasheet update #5

Open nikthefix opened 7 months ago

nikthefix commented 7 months ago

Please upload an updated version of the AXS15231 datasheet if you have it.

The current datasheet shows that optional parameters in the DCTR register can be set to change scan configuration which would allow for a hardware screen rotate rather than the currently necessary soft rotate - but the documentation appears to be incomplete.

Perhaps these are OTP config settings for factory use but I'd love to know for sure.

I think it's odd that a display with this form factor is native portrait and does not automatically switch scanning according to the MY,MX,MV,ML,MH bits in the register. The clue is in cr_ca and cr_gs but I need more documentation.

Thanks.

lewisxhe commented 7 months ago

Although the manual has a scan setting register, it is actually invalid. This has been determined with the screen supplier. Most screens now do not support rotation and can only be rotated using software. AXS15231_Datasheet_V0.4_20221108-立项版(1).pdf

nikthefix commented 7 months ago

Thanks Lewis. I suspected that it wasn't implemented for this display model. Never mind, soft rotate is working just fine.

I have a landscape mode TFT_eSPI demo for the Long which I'll upload in a couple of days. Just tidying up a bit.

nik

nikthefix commented 7 months ago

Sorry Lewis, one last question:

The display init sequence in const static lcd_cmd_t axs15231b_qspi_init_new[]......

Is this redundant? Was it used for testing purposes? Does it configure the display in a different way?

Thanks again,

nik

lewisxhe commented 7 months ago

That's unnecessary. The guy who maintained this warehouse before didn't delete this part.

nikthefix commented 7 months ago

Great! Thanks.

nikthefix commented 6 months ago

Hi again Lewis.

I've been experimenting with some of the hardware accelerated features like Pixel_Fill and Region_Pixel_Fill in order to add fast clear screen etc. It seems that the display is factory configured for partial update for these features. A full Pixel_Fill will cover 2/3rds of the display only. Am I right in thinking the display has been factory flashed to be like this or is it just undefined behavior because these commands were not implemented for this display model?

Not a problem at all. Just interested to explore the datasheet.

If you have access to the manufacturer OTP register datasheet I'd be very interested. Hard to obtain I imagine.

nik

lewisxhe commented 6 months ago

The initialization part and color are the optimal solutions adjusted by the screen supplier. We cannot obtain the OTP part. It is confidential and I cannot help you.