Arduino_GFX_Library.h problems

Projects Programming
1

we have the waveshare esp32 S3 2" display and when we try to run the following demo code:

#include <Arduino_GFX_Library.h>

#define EXAMPLE_PIN_NUM_LCD_SCLK 39
#define EXAMPLE_PIN_NUM_LCD_MOSI 38
#define EXAMPLE_PIN_NUM_LCD_MISO 40
#define EXAMPLE_PIN_NUM_LCD_DC 42
#define EXAMPLE_PIN_NUM_LCD_RST -1
#define EXAMPLE_PIN_NUM_LCD_CS 45
#define EXAMPLE_PIN_NUM_LCD_BL 1

#define EXAMPLE_LCD_ROTATION 1
#define EXAMPLE_LCD_H_RES 240
#define EXAMPLE_LCD_V_RES 320

/* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
Arduino_DataBus *bus = new Arduino_ESP32SPI(
  EXAMPLE_PIN_NUM_LCD_DC /* DC */, EXAMPLE_PIN_NUM_LCD_CS /* CS */,
  EXAMPLE_PIN_NUM_LCD_SCLK /* SCK */, EXAMPLE_PIN_NUM_LCD_MOSI /* MOSI */, EXAMPLE_PIN_NUM_LCD_MISO /* MISO */);

/* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
Arduino_GFX *gfx = new Arduino_ST7789(
  bus, EXAMPLE_PIN_NUM_LCD_RST /* RST */, EXAMPLE_LCD_ROTATION /* rotation */, true /* IPS */,
  EXAMPLE_LCD_H_RES /* width */, EXAMPLE_LCD_V_RES /* height */);

/*******************************************************************************
 * End of Arduino_GFX setting
 ******************************************************************************/

void setup(void)
{
  Serial.begin(115200);
  // Serial.setDebugOutput(true);
  // while(!Serial);
  Serial.println("Arduino_GFX Hello World example");

#ifdef GFX_EXTRA_PRE_INIT
  GFX_EXTRA_PRE_INIT();
#endif

  // Init Display
  if (!gfx->begin())
  {
    Serial.println("gfx->begin() failed!");
  }
  gfx->fillScreen(BLACK);

#ifdef EXAMPLE_PIN_NUM_LCD_BL
  pinMode(EXAMPLE_PIN_NUM_LCD_BL, OUTPUT);
  digitalWrite(EXAMPLE_PIN_NUM_LCD_BL, HIGH);
#endif

  gfx->setCursor(10, 10);
  gfx->setTextColor(RED);
  gfx->println("Hello World!");

  delay(5000); // 5 seconds
}

void loop()
{
  gfx->setCursor(random(gfx->width()), random(gfx->height()));
  gfx->setTextColor(random(0xffff), random(0xffff));
  gfx->setTextSize(random(6) /* x scale */, random(6) /* y scale */, random(2) /* pixel_margin */);
  gfx->println("Hello World!");

  delay(1000); // 1 second
}

we get the following error:

02_gfx_helloworld/02_gfx_helloworld.ino: In function 'void setup()':

02_gfx_helloworld.ino:45:19: error: 'BLACK' was not declared in this scope
   45 |   gfx->fillScreen(BLACK);

02_gfx_helloworld.ino:53:21: error: 'RED' was not declared in this scope; did you mean 'RER'?
   53 |   gfx->setTextColor(RED);
      |                     ^~~
      |                     RER
exit status 1
2

Color names are defined specifically for each type of display, and represent an appropriate integer constant.

Look through the library docs or code to see what names are defined for your display, or use the appropriate constants instead. Or, you can define BLACK to be the appropriate constant, for example.

3

Thank you !!! I changed it to :

#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF

and it worked !

4

Your topic does not indicate a problem with IDE 2.x and therefore has been moved to a more suitable location on the forum.

Please mark the most useful reply as solution so others know that a solution was provided. There is an option for it under every reply.

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