esp32-8048S070C glitch when writing to EEPROM

[IanSC]

Horizontal sections of the screen jumps a bit from left to right randomly when saving to EEPROM.

It does not happen all the time. Sometimes it's the whole screen, but usually just a horizontal slice at the bottom. In case it's a hardware conflict, is there a way to time the eeprom save operation? eg. save right after the end of a full screen update

https://github.com/rzeldent/esp32-smartdisplay/assets/8453489/c92b2a22-b2e5-4eb4-9cca-70fa3f7c489a

Code for the glitch:

#include <esp32_smartdisplay.h>
#include <Preferences.h>

void screenGlitch() {

    lv_obj_t * bg = lv_obj_create( lv_scr_act() );
    lv_obj_center( bg );
    lv_obj_set_size( bg, lv_pct(90), lv_pct(90) );
    lv_obj_set_style_bg_color( bg, lv_palette_main( LV_PALETTE_BLUE ), 0 );

    lv_obj_t * label = lv_label_create( bg );
    lv_obj_center( label );

    unsigned long next_update = millis();
    uint8_t counter = 0;

    while( 1 ) { // SIMULATE LOOP

        lv_timer_handler();

        // every 0.5 to 1 seconds
        auto t = rand() % 1000 + 500;
        if ( millis() - next_update > t ) {

            Preferences p;
            if ( p.begin( "myFile", false ) ) {
                // must save different data to get glitch
                p.putUChar( "key", counter );
                p.end();
                counter++;
                lv_label_set_text_fmt( label, "%d", counter++ );
                // log_i();
            }
            next_update = millis();
        }
    }
}
void setup() {
    smartdisplay_init();
    screenGlitch();
}
void loop() {}

None of what I tried worked:

auto disp = lv_disp_get_default();
lv_timer_del( disp->refr_timer );
disp->refr_timer = nullptr;
... save to eeprom
disp->refr_timer = lv_timer_create( _lv_disp_refr_timer, LV_DISP_DEF_REFR_PERIOD, disp );
LV_ASSERT_MALLOC( disp->refr_timer );

auto disp = lv_disp_get_default();
lv_timer_pause( disp->refr_timer );
... save to eeprom
lv_timer_resume( disp->refr_timer );

[rzeldent]

Hi Ian,

Yes, this is because the screen is refreshed continuously and think saving to the EEPROM might cause these glitches. Haven't tried it yet but maybe setting ST7262_PANEL_CONFIG_FLAGS_RELAX_ON_IDLE to 1 might help? Maybe?

[IanSC]

Hi @rzeldent ,

The example I made is to get the glitch continuously for video. It also happens if the time is changed to 10 sec interval or in a regular app.

Any tips on where I can find / where to set the flag? I ran:

grep -r 'FLAGS_RELAX_ON_IDLE' .

in: ~/.platformio, esp32_smartdisplay, lvgl could not find any terms close to ST7262_PANEL_CONFIG_FLAGS_RELAX_ON_IDLE

Thanks,

[rzeldent]

Oh yea, it is in de json of the board, in the boards directory

[IanSC]

In File: esp32-8048S070C.json Section: extra_flags Added: "-DST7262_PANEL_CONFIG_FLAGS_RELAX_ON_IDLE=1", still same glitch.

I also tried:

"-DST7262_PANEL_CONFIG_FLAGS_RELAX_ON_IDLE=1",
"-DST7796_PANEL_CONFIG_FLAGS_RELAX_ON_IDLE=1",
"-DST7789_PANEL_CONFIG_FLAGS_RELAX_ON_IDLE=1",
"-DRGB_PANEL_CONFIG_FLAGS_RELAX_ON_IDLE=1",

Just in case, since it's most similar to the driver's name in your library. Still got the glitch.

[rzeldent]

Hi Ian,

Thanks for the code to reproduce it. I looked at it and think the PCLK was a bit on the edge. I updated the boards to have a PCLK of 12M instead of 16M.

Take a look at the develop branch. No glitching anymore. Thanks for bringing this up!

[IanSC]

Hi @rzeldent,

Tried it and it works now. Even the colors and text are working.

However the screen is 180 degrees flipped, so I changed TOUCH_SWAP_X and TOUCH_SWAP_Y

I'll do some futher tests and close this issue in a few days.

Thanks again.

For other noobs like me:

My .gitmodules is not properly configured. So just downloaded: https://github.com/rzeldent/platformio-espressif32-sunton and placed the files in boards folder.

After I compiled, I got missing lvgl_touch_init() not linked error.

• comment out https://github.com/rzeldent/esp32-smartdisplay.git from lib_deps = in platformio.ini.
• Save. This will remove the library.
• Restore it and save again. The version is now 2.0.4. You can check it from: .pio/libdeps/<<MY-PROJECT>>/esp32_smartdisplay/library.json
• Deleting the .pio folder will have the same effect, but will redownload everything.

I thought the touch was not working, so I touched all over the screen. Turns out it was just flipped.

To fix:

• Make a copy of esp32-8048S070C.json inside board folder
• Rename as, say esp32-8048S070C-flipped.json
• Edit it and change, from true to false in my case:

  "'-D TOUCH_SWAP_X=false'",
  "'-D TOUCH_SWAP_Y=false'",

• Edit platformio.ini and use board = esp32-8048S070C-flipped
• Rebuild

So guys, again, let's support or buy this guy a beer, without his efforts these boards will be useless or extremely difficult to use. Looking at you Sunton.