Hello everyone! I am a beginner in programming, in the past couple of months i started to use arduino to work with small displays like GC9A01. I was able to make them work and meanwhile i searched for some information i came across 2,1inch RGB 480x480 round displays. I ordered some from aliexpress. Now I having a hard time to make it work, first i would like to use a simple HelloWorld code.
I bought the display from here with a board:
https://www.aliexpress.us/item/1005005966888061.html
To test it out i connected the display and the attached board to my PC with a USB and an HDMI cable, and it was working fine as an extra little touch monitor.
I also ordered this controller for programming:
https://learn.adafruit.com/adafruit-qualia-esp32-s3-for-rgb666-displays
I found CosmicOwl's topic about this type of displays and moononournation github page. CosmicOwl had to make some changes in libraries, but i can't find these: "Arduino_ST7701_RGBPanel.h" and "Arduino_ST7701_RGBPanel.cpp". Are these created by him? Where should i look for them?
https://forum.arduino.cc/t/esp32s3-and-st7701s/1004892/9
I tried to use the HelloWorld example from moononournation library with some changes as you can see below. I could upload to my display without an error, but nothing appears on the screen.
/*******************************************************************************
* Start of Arduino_GFX setting
*
* Arduino_GFX try to find the settings depends on selected board in Arduino IDE
* Or you can define the display dev kit not in the board list
* Defalult pin list for non display dev kit:
* ESP32 various dev board : CS: 5, DC: 27, RST: 33, BL: 22, SCK: 18, MOSI: 23, MISO: nil
* ESP32-C3 various dev board : CS: 7, DC: 2, RST: 1, BL: 3, SCK: 4, MOSI: 6, MISO: nil
* ESP32-S2 various dev board : CS: 34, DC: 38, RST: 33, BL: 21, SCK: 36, MOSI: 35, MISO: nil
* ESP32-S3 various dev board : CS: 40, DC: 41, RST: 42, BL: 48, SCK: 36, MOSI: 35, MISO: nil
* ESP8266 various dev board : CS: 15, DC: 4, RST: 2, BL: 5, SCK: 14, MOSI: 13, MISO: 12
******************************************************************************/
#include <Arduino_GFX_Library.h>
#define GFX_BL 1 // default backlight pin, you may replace DF_GFX_BL to actual backlight pin
/* More dev device declaration: https://github.com/moononournation/Arduino_GFX/wiki/Dev-Device-Declaration */
//#if defined(DISPLAY_DEV_KIT)
//Arduino_GFX *gfx = create_default_Arduino_GFX();
//#else /* !defined(DISPLAY_DEV_KIT) */
Arduino_DataBus *bus = new Arduino_SWSPI(
GFX_NOT_DEFINED /* DC */, 21 /* CS */,
47 /* SCK */, 41 /* MOSI */, GFX_NOT_DEFINED /* MISO */);
Arduino_ESP32RGBPanel *rgbpanel = new Arduino_ESP32RGBPanel(
39 /* DE */, 48 /* VSYNC */, 40 /* HSYNC */, 45 /* PCLK */,
10 /* R0 */, 16 /* R1 */, 9 /* R2 */, 15 /* R3 */, 46 /* R4 */,
8 /* G0 */, 13 /* G1 */, 18 /* G2 */, 12 /* G3 */, 11 /* G4 */, 17 /* G5 */,
47 /* B0 */, 41 /* B1 */, 0 /* B2 */, 42 /* B3 */, 14 /* B4 */,
1 /* hsync_polarity */, 10 /* hsync_front_porch */, 10 /* hsync_pulse_width */, 10 /* hsync_back_porch */,
1 /* vsync_polarity */, 14 /* vsync_front_porch */, 2 /* vsync_pulse_width */, 12 /* vsync_back_porch */);
Arduino_RGB_Display *gfx = new Arduino_RGB_Display(
480 /* width */, 480 /* height */, rgbpanel, 0 /* rotation */, true /* auto_flush */,
bus, GFX_NOT_DEFINED /* RST */, st7701_type7_init_operations, sizeof(st7701_type7_init_operations));
/* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
//Arduino_DataBus *bus = create_default_Arduino_DataBus();
/* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
//Arduino_GFX *gfx = new Arduino_ILI9341(bus, DF_GFX_RST, 0 /* rotation */, false /* IPS */);
//#endif /* !defined(DISPLAY_DEV_KIT) */
/*******************************************************************************
* 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 GFX_BL
pinMode(GFX_BL, OUTPUT);
digitalWrite(GFX_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
}
I assume that i have a problem with this part of the code and some kind of communication can't happen between the controller and the display:
Arduino_DataBus *bus = new Arduino_SWSPI(
GFX_NOT_DEFINED /* DC */, 21 /* CS */,
47 /* SCK */, 41 /* MOSI */, GFX_NOT_DEFINED /* MISO */);
Arduino_ESP32RGBPanel *rgbpanel = new Arduino_ESP32RGBPanel(
39 /* DE */, 48 /* VSYNC */, 40 /* HSYNC */, 45 /* PCLK */,
10 /* R0 */, 16 /* R1 */, 9 /* R2 */, 15 /* R3 */, 46 /* R4 */,
8 /* G0 */, 13 /* G1 */, 18 /* G2 */, 12 /* G3 */, 11 /* G4 */, 17 /* G5 */,
47 /* B0 */, 41 /* B1 */, 0 /* B2 */, 42 /* B3 */, 14 /* B4 */,
1 /* hsync_polarity */, 10 /* hsync_front_porch */, 10 /* hsync_pulse_width */, 10 /* hsync_back_porch */,
1 /* vsync_polarity */, 14 /* vsync_front_porch */, 2 /* vsync_pulse_width */, 12 /* vsync_back_porch */);
Arduino_RGB_Display *gfx = new Arduino_RGB_Display(
480 /* width */, 480 /* height */, rgbpanel, 0 /* rotation */, true /* auto_flush */,
bus, GFX_NOT_DEFINED /* RST */, st7701_type7_init_operations, sizeof(st7701_type7_init_operations));
I would be very grateful if someone could explain in detail exactly what is happening in this code snippet and would really appreciate any further information from someone who succesfully used this display!
Thank you in advance! 
Best regards: Zsolt
