U8G2_ST7565_NHD_C12864 shows all pixels on after .begin()

[Paulywog32]

Hi after updating the libraries to the latest version my code now displays all pixels "on" after the .begin() function.
After some testing this issue shows up after version 2.32.7 (works) all newer version display an all black screen.

Any help on this would be appreciated. Until then I will be limited to version 2.32.7

I am using the NHD-C12864A1Z-FSW-FBW-HTT display that has a ST7565 controller.
using class:
U8G2_ST7565_NHD_C12864_F_4W_SW_SPI
platform IO with ESP32-rover.

Thanks
Paul Cote

[olikraus]

hmmm... seems to be a feature not a bug:

u8g2/csrc/u8x8_d_st7565.c

Line 644 in ec7c1fa

U8X8_C(0x0a5), /* enter powersafe: all pixel on, issue 142 */

and
#142 (power down sequence for ST7565, UC1701 and others)

In your code: Did you miss to leave power down mode? in fact power on sequence will put your display into "normal" mode (0xa4):

u8g2/csrc/u8x8_d_st7565.c

Lines 43 to 49 in ec7c1fa

	static const uint8_t u8x8_d_st7565_powersave0_seq[] = {
	U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */
	U8X8_C(0x0a4), /* all pixel off, issue 142 */
	U8X8_C(0x0af), /* display on */
	U8X8_END_TRANSFER(), /* disable chip */
	U8X8_END() /* end of sequence */
	};

With u8g2 you need to use

u8g2.setPowerSave(0)

to leave power down mode (https://github.com/olikraus/u8g2/wiki/u8g2reference#setpowersave)

Still strange, because setPowerSave is automatically called with u8g2.begin()

[Paulywog32]

Found the issue, there was a change to the contrast value (issue 1678) that caused my old value scaling to not work the same way. sorry for the inconvenience, I've readjusted my value and now the newest version works.

Thanks