ST7735 display is flickering

[maxholgasson]

Hi,
I tested your example LCDML_adafruit_gfx_st7735 and noticed some weird flickering when I click through the menu.
I only used SSD1306 displays so far and the operation is very smooth with those
Is there a way to fix it? MCU is a SAMD21
I assume it's because the displays gets cleared each time

ST7735.mp4

[Jomelo]

Hi,
i have fix a bug today. The display was refreshed with every cursor movement.

Can you test the lates beta version v2.2.7 beta 2.

Best Regards

[rsp-git]

Where can i find the beta2? I Use the 2.2.7 release and there is the same problem.
The Refresh let's the display flickr.
In the INO Files inside your Project should be the file LCDML_display_menu.ino and there is the "refresh" Function.
I added a if section arround fillscreen command:
if (LCDML.DISP_checkMenuUpdate()) { display.fillScreen(_LCDML_ADAFRUIT_BACKGROUND_COLOR); }

Then I switch from X as cursor to Color as Cursor - before i only draw a black box over the X positions:
if(tmp->checkType_menu() == true) { LCDML_getContent(content_text, tmp->getID()); display.setCursor(0, _LCDML_ADAFRUIT_FONT_H * (n)); if(LCDML.MENU_getCursorPos()==n) display.setTextColor(_LCDML_ADAFRUIT_HIGHLIGHT_COLOR); else display.setTextColor(_LCDML_ADAFRUIT_TEXT_COLOR); display.println(content_text); /*if (LCDML.DISP_checkMenuCursorUpdate()) { } else { display.fillRect(0, _LCDML_ADAFRUIT_FONT_H * (n), 16, _LCDML_ADAFRUIT_FONT_H, _LCDML_ADAFRUIT_BACKGROUND_COLOR); }*/ }
Everything works fine - only for the dynamic value. there i need to know how to detect this. If the function lcdml_menu_display() is called it clears the display, also if there is no "menu update". How can i detect this? Then everything works fine.

Here is the Upload:
https://github.com/rsp-git/Color-Display-LCDML

@maxholgasson: Do you use interrupts for encoder? Tell me how :)

[Jomelo]

Hi,
i will check this in the next weeks.

[localhero44]

Hi guys, is this problem solved ? I also notice flickering.

[Jomelo]

When this bug also happens this is not fixed.
I have to order a new display to test it. All my displayes are build in some projects.

I will check it.

[Jomelo]

I have reproduce the bug on my small OLED screen. I´m looking for an bug fix in the next weeks.

[indalg]

Gracias El El lun, abr 21, 2025 a la(s) 3:44 p.m., Jomelo ***@***.***> escribió:

…

I have reproduce the bug on my small OLED screen. I´m looking for an bug fix in the next weeks. — Reply to this email directly, view it on GitHub <#74 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGGW62O7FX5XKFD5X2SYV2T22VDCRAVCNFSM6AAAAAB3R56VNCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQMJZGM2TKNRXGI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***> *Jomelo* left a comment (Jomelo/LCDMenuLib2#74) <#74 (comment)> I have reproduce the bug on my small OLED screen. I´m looking for an bug fix in the next weeks. — Reply to this email directly, view it on GitHub <#74 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGGW62O7FX5XKFD5X2SYV2T22VDCRAVCNFSM6AAAAAB3R56VNCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQMJZGM2TKNRXGI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>