st7302 high performance mode flashing

[yueduz]

Has anyone tried the high-performance mode? When I use the x38 command to enable high-performance mode, the screen keeps flickering.

[olikraus]

I am confused. Isn't the high power mode activated already?

u8g2/csrc/u8x8_d_st7302.c

Line 315 in 5f96958

U8X8_C(0x38), // High Power Mode

[yueduz]

https://github.com/olikraus/u8g2/blob/5f969586c7659fc236fb650c46c8c2f068abe29f/csrc/u8x8_d_st7302.c#L342C1

It is set to low-power mode in line 342

[olikraus]

oh, ok I see. Hmm maybe then I should remove the cmd in line 315.

When I use the x38 command to enable high-performance mode, the screen keeps flickering.

Maybe I encountered the same problem and switched back to low power mode (I don't remember).
Often the commands depend on each other and it is difficult to find a combination of all the commands, which leads
to an acceptable result.

In detail:

• In high power mode, try a different frame rate (0xB2 cmd). In u8g2 this is set to 1 (=32Hz). Check out 0 (=16Hz). Maybe the flicker is gone.
• Look out for other commands, which do influence the timing. Maybe 0xB8 could be such a value which needs to be configured in a different way for high power mode.

[yueduz]

I tried many combinations, none of them worked. But I found that 32Hz flickering is more serious than 16Hz. The video is 16hz case.

PXL_20250223_013625606.TS.mp4

[yueduz]

I tried using 'U8X8_C (0x12),//Partial On' to avoid flickering. When the screen is still, it does not flicker, but it has an extra strong line that should not appear.

[olikraus]

hmm.. not sure how I can help here... Sometimes a display just doesn't support all features of the display controller.