Example Code for Arduino-SPI Communication

Hardware Preparation

• FireBeetle 2 ESP32-E (SKU: DFR0654) ×1
• Gravity: I2C OLED-128x64 Display（SKU: DFR0486）×1
• USB Data Cable ×1
• Dupont Wires

Software Preparation

• Download GDL library: https://github.com/DFRobot/DFRobot_GDL

Wiring Diagram

Pin Connections:

Sample Code

Drive the display via SPI to show text and numbers.

#include "DFRobot_GDL.h"
#define TFT_DC  D2
#define TFT_CS  D6
#define TFT_RST D3
#define TFT_BL  D13

DFRobot_ST7789_240x320_HW_SPI screen(/*dc=*/TFT_DC,/*cs=*/TFT_CS,/*rst=*/TFT_RST);

void setup() {
  Serial.begin(115200);    //Init
  screen.begin();
  screen.setTextSize(2);   //Text size is 4, range is 1-4
  screen.fillScreen(COLOR_RGB565_BLACK);    //Screen background color
  screen.setFont(&FreeMono12pt7b);       //Font format 
  screen.setCursor(/*x=*/10,/*y=*/120);    //Starting point of text
  screen.setTextColor(COLOR_RGB565_LGRAY);   //Color of text
  screen.print("DFRobot");    //Output text content
  screen.setCursor(10,200);
  screen.setTextColor(COLOR_RGB565_GREEN);
  screen.setTextWrap(true);
  screen.print("20220828");
}

void loop() {
}

Result

The screen displays the text "DFRobot" in white and the number "20220828" in green.