基于ESP-WROOM-32的双串口通信并显示到OLED显示屏上

开发板

ESP-WROOM-32

引脚图

在这里插入图片描述

Arduino环境配置

1.ESP32开发版下载

选择 esp32 by Espressif Systems

2.Arduino开发板选择 -> ESP32 Dev Module

Flash Mode选择DIO
连接ESP32并选择指定端口

3.安装驱动库

ESP8266 and ESP32 OLED driver for SSD1306 displays by ThingPulse, Fabrice Weinberg

版本：4.4.0以上

接线图

ESP32开发版	OLED模块	串口1	串口2
GND	GND
3V3	VCC
GPIO22	SCL
GPIO21	SDA
TypeC接口		TypeC
GPIO17			RX
GPIO16			TX

Arduino代码


#include <Wire.h>               // Only needed for Arduino 1.6.5 and earlier
#include "SSD1306Wire.h"        // legacy: #include "SSD1306.h"


SSD1306Wire display(0x3c, SDA, SCL);   // ADDRESS, SDA, SCL  -  SDA and SCL 

void setup() {
  Serial.begin(9600);
  Serial2.begin(9600);
  Serial.println();

  // Initialising the UI will init the display too.
  display.init();

  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);

}

void loop() {
  // clear the display
  
  //从串口监视器读取输入数据
    if(Serial.available()){
      char data = Serial.read();
      display.clear();
      display.flipScreenVertically();
      display.setTextAlignment(TEXT_ALIGN_LEFT);
      display.setFont(ArialMT_Plain_10);
      display.drawString(0, 0, "Serial.read:");
      display.drawString(0, 12, "Serial2.read:");
      display.drawString(65, 0, &data);
      display.display();
      //将数据发送到 UART2
      Serial2.write(data);
    }

    //从UART2读取输入数据
    if(Serial2.available()){
      char data = Serial2.read();
      display.clear();
      display.flipScreenVertically();
      display.setTextAlignment(TEXT_ALIGN_LEFT);
      display.setFont(ArialMT_Plain_10);
      display.drawString(0, 0, "Serial.read:");
      display.drawString(0, 12, "Serial2.read:");
      display.drawString(70, 12, &data);
      display.display();
      //将数据发送到 UART2
      Serial.write(data);
    }

}