LCD RGB Element Order different between examples

[lboue]

LCD RGB Element Order different between examples

LCD RGB Element Order is different between examples. For example with LCD/RGB/RGB.ino and LVGL/v8/Porting/Porting.ino

LCD RGB example

• Defaut "LCD RGB Element Order" for LCD/RGB/RGB.ino is BGR.

https://github.com/esp-arduino-libs/ESP32_Display_Panel/blob/293faff58c65b1a6e03f34b13b4b513e71b8e408/examples/LCD/RGB/RGB.ino#L26

LVGL v8 Porting example

• Defaut "LCD RGB Element Order" for Porting.ino is RGB.

https://github.com/esp-arduino-libs/ESP32_Display_Panel/blob/293faff58c65b1a6e03f34b13b4b513e71b8e408/examples/Panel/PanelTest/ESP_Panel_Board_Custom.h#L187-L191

Is there a way to simplify by homogenizing? This would avoid errors for users.

Regards

[Lzw655]

Hi @lboue,

1. The color order (B - G - R) mentioned in the comments of the LCD RGB example indicates the order of the color bars drawn from top to bottom in the colorBarTest()

2. The "LCD RGB Element Order" in ESP_Panel_Board_Custom.h refers to setting the properties of the LCD driver chip through commands. The image below shows the "RGB Element Order" for the ST7701.

[lboue]

Thanks for the explanation. So in what order should the GPIOs be indicated here in LCD/RGB/RGB.ino since this is not specified. I couldn't find any comments to guide me. https://github.com/esp-arduino-libs/ESP32_Display_Panel/blob/a20b003af748d97e78cb23b7f4150f65ea38c678/examples/LCD/RGB/RGB.ino#L72-L88

I also didn't find the 'RGB Element Order' parameter in RGB.ino file.

[lboue]

For top-down display Blue, Green, Red. I had to change the GPIO order in the example configuration. Otherwise, the display is inverted.

My board is board the Elecrow CrowPanel 7.0":

#define EXAMPLE_LCD_PIN_NUM_RGB_DISP            (-1)
#define EXAMPLE_LCD_PIN_NUM_RGB_VSYNC           (40)
#define EXAMPLE_LCD_PIN_NUM_RGB_HSYNC           (39)
#define EXAMPLE_LCD_PIN_NUM_RGB_DE              (41)
#define EXAMPLE_LCD_PIN_NUM_RGB_PCLK            (0)

// Blue
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA0           (15) // B0
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA1           (7)  // B1
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA2           (6)  // B2
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA3           (5)  // B3
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA4           (4)  // B4

// Green
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA5           (9)  // G0
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA6           (46) // G1
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA7           (3)  // G2
#if EXAMPLE_LCD_RGB_DATA_WIDTH > 8
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA8           (8)  // G3
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA9           (16) // G4
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA10          (1)  // G5

// Red
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA11          (14) // R0
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA12          (21) // R1
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA13          (47) // R2
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA14          (48) // R3
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA15          (45) // R4

[Lzw655]

For top-down display Blue, Green, Red. I had to change the GPIO order in the example configuration. Otherwise, the display is inverted.

My board is board the Elecrow CrowPanel 7.0":

#define EXAMPLE_LCD_PIN_NUM_RGB_DISP            (-1)
#define EXAMPLE_LCD_PIN_NUM_RGB_VSYNC           (40)
#define EXAMPLE_LCD_PIN_NUM_RGB_HSYNC           (39)
#define EXAMPLE_LCD_PIN_NUM_RGB_DE              (41)
#define EXAMPLE_LCD_PIN_NUM_RGB_PCLK            (0)

// Blue
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA0           (15) // B0
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA1           (7)  // B1
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA2           (6)  // B2
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA3           (5)  // B3
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA4           (4)  // B4

// Green
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA5           (9)  // G0
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA6           (46) // G1
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA7           (3)  // G2
#if EXAMPLE_LCD_RGB_DATA_WIDTH > 8
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA8           (8)  // G3
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA9           (16) // G4
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA10          (1)  // G5

// Red
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA11          (14) // R0
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA12          (21) // R1
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA13          (47) // R2
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA14          (48) // R3
#define EXAMPLE_LCD_PIN_NUM_RGB_DATA15          (45) // R4

This configuration is correct. I suggest adding connection comments for the RGB pins in ESP_Panel_Board_Custom.h. This will help users understand how to connect the pins between the LCD and the ESP more clearly.