LVGL 9X: TFT Display color issues using EEZ studio

My projects
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1

The GUI design in EEZ studio looks like this below
ESP32_TFT_Weather_Monitor_GUI
But the result on TFT Display is looks like this

1762232085373
17622320853732048Ă—921 206 KB

the lv_conf.h file settings are for the color depth,#define LV_COLOR_DEPTH 16. But I have tried changing it to 24 and 32 but the result blurry and nothing can be read. What should be done to get the designed screen?
Thanks

2

Hello,

It looks like the colors are swapped. You may have to reimplement the lv_flush_cb() function to swap the colors.

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3

where to start, where should I implement this callback function?

4

It should already be implemented somehwere, it’s used to draw your frames to the screen.If you are using a driver somebody else made, which is it?

5

While selecting the TFT_Driver in user_setup.h file, the result of generic display driver #define ILI9341_DRIVER results in

1000016635
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But the driver #define ILI9341_2_DRIVER results
1000016593
10000165931920Ă—4268 524 KB

the second driver i think linked to this github repository ILI9341_Init.h - Strange graphic issues depending on TFT · Issue #1172 · Bodmer/TFT_eSPI · GitHub
thanks in advance

6

Have you tried to add this in setup() loop, where tft is initialised?

 tft.setSwapBytes(true);

You also have these settings for TFT_eSPI :

#define TFT_RGB_ORDER TFT_RGB  // Colour order Red-Green-Blue
#define TFT_RGB_ORDER TFT_BGR // Colour order Blue-Green-Red
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7

Tried the tft.setSwapBytes(true) in the setup(), but no visible change. But regarding the settings you mentioned i think the TFT_config.h file already have this defined like this

#ifdef CONFIG_TFT_RGB_ORDER
#define TFT_RGB_ORDER TFT_RGB
#endif

#ifdef CONFIG_TFT_BGR_ORDER
#define TFT_RGB_ORDER TFT_BGR
#endif
does it need any repetition some other files as well?

8

No. Have you tried only tft_eSPI example first?
Btw, you could figure out how to use lvgl internal driver, since you are using V9.

9

The example worked nicely without color distortion. “lvgl internal driver” by this you meant “lv_tft_espi” .c .h files right?

10

1000016689
10000166891920Ă—4268 556 KB

Changes in User_setup.h file:
#define ILI9341_2_DRIVER
#define TFT_RGB_ORDER TFT_BGR
#define TFT_INVERSION_ON

Changes in lv_conf.h file:
#define LV_COLOR_16_SWAP 1
color depth 16

changes in lvgl_tft_espi.c Source file: @Tinus

static void flush_cb(lv_display_t * disp, const lv_area_t * area, uint8_t * px_map)
{
    lv_tft_espi_t * dsc = (lv_tft_espi_t *)lv_display_get_driver_data(disp);

    uint32_t w = (area->x2 - area->x1 + 1);
    uint32_t h = (area->y2 - area->y1 + 1);

    dsc->tft->startWrite();
    dsc->tft->setAddrWindow(area->x1, area->y1, w, h);
    dsc->tft->pushColors((uint16_t *)px_map, w * h, false); //Changed "true" to "false" 
    dsc->tft->endWrite();

    lv_display_flush_ready(disp);

}
11

Note that LVGL v9.4 can render in SWAPPED color format too. You can enable it by

  lv_display_set_color_format(disp, LV_COLOR_FORMAT_RGB565_SWAPPED);
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