两个GRBL连接Mega2560和迪文屏，以及通过迪文屏触摸控制命令驱动两个GRBL的代码

以下是通过迪文屏触摸控制命令驱动两个GRBL的代码：

#include <SoftwareSerial.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <TouchScreen.h>

#define TFT_CS 10
#define TFT_DC 9
#define TFT_RST 8
#define TS_CS 7

#define BAUDRATE 115200

// GRBL 1
SoftwareSerial grbl1Serial(2, 3); // RX, TX
bool grbl1Connected = false;

// GRBL 2
SoftwareSerial grbl2Serial(4, 5); // RX, TX
bool grbl2Connected = false;

// Touchscreen
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

// Display
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

// Button
struct Button {
  int x;
  int y;
  int width;
  int height;
  String text;
  uint16_t color;
  bool pressed;
};

// Buttons
Button btn1 = {
  10, 10, 80, 40, "GRBL 1", ILI9341_RED, false
};

Button btn2 = {
  100, 10, 80, 40, "GRBL 2", ILI9341_GREEN, false
};

Button btnHome = {
  220, 10, 80, 40, "Home", ILI9341_BLUE, false
};

Button btnReset = {
  220, 80, 80, 40, "Reset", ILI9341_YELLOW, false
};

Button btnStop = {
  220, 150, 80, 40, "Stop", ILI9341_PURPLE, false
};

Button btnXPlus = {
  10, 80, 40, 40, "+X", ILI9341_CYAN, false
};

Button btnXMinus = {
  60, 80, 40, 40, "-X", ILI9341_CYAN, false
};

Button btnYPlus = {
  110, 80, 40, 40, "+Y", ILI9341_CYAN, false
};

Button btnYMinus = {
  160, 80, 40, 40, "-Y", ILI9341_CYAN, false
};

Button btnZPlus = {
  210, 80, 40, 40, "+Z", ILI9341_CYAN, false
};

Button btnZMinus = {
  260, 80, 40, 40, "-Z", ILI9341_CYAN, false
};

void setup() {
  Serial.begin(BAUDRATE);
  grbl1Serial.begin(BAUDRATE);
  grbl2Serial.begin(BAUDRATE);
  tft.begin();
  tft.setRotation(1);
  pinMode(TS_CS, OUTPUT);
  ts.begin();
}

void loop() {
  // Check if GRBL 1 is connected
  if (!grbl1Connected) {
    grbl1Serial.write("\r\n\r\n");
    delay(1000);
    while (grbl1Serial.available()) {
      char c = grbl1Serial.read();
      if (c == '\n') {
        grbl1Connected = true;
        break;
      }
    }
  }

  // Check if GRBL 2 is connected
  if (!grbl2Connected) {
    grbl2Serial.write("\r\n\r\n");
    delay(1000);
    while (grbl2Serial.available()) {
      char c = grbl2Serial.read();
      if (c == '\n') {
        grbl2Connected = true;
        break;
      }
    }
  }

  // Check for button press
  TSPoint p = ts.getPoint();
  pinMode(TS_CS, OUTPUT);
  digitalWrite(TS_CS, LOW);
  if (p.z > ts.pressureThreshhold) {
    int x = map(p.x, TS_MINX, TS_MAXX, 0, tft.width());
    int y = map(p.y, TS_MINY, TS_MAXY, 0, tft.height());
    if (btn1.x <= x && x <= btn1.x + btn1.width &&
        btn1.y <= y && y <= btn1.y + btn1.height) {
      btn1.pressed = true;
    } else if (btn2.x <= x && x <= btn2.x + btn2.width &&
               btn2.y <= y && y <= btn2.y + btn2.height) {
      btn2.pressed = true;
    } else if (btnHome.x <= x && x <= btnHome.x + btnHome.width &&
               btnHome.y <= y && y <= btnHome.y + btnHome.height) {
      if (btn1.pressed) {
        grbl1Serial.write("$H\n");
      } else if (btn2.pressed) {
        grbl2Serial.write("$H\n");
      }
    } else if (btnReset.x <= x && x <= btnReset.x + btnReset.width &&
               btnReset.y <= y && y <= btnReset.y + btnReset.height) {
      if (btn1.pressed) {
        grbl1Serial.write(String((char)0x18) + "\n");
      } else if (btn2.pressed) {
        grbl2Serial.write(String((char)0x18) + "\n");
      }
    } else if (btnStop.x <= x && x <= btnStop.x + btnStop.width &&
               btnStop.y <= y && y <= btnStop.y + btnStop.height) {
      if (btn1.pressed) {
        grbl1Serial.write(String((char)0x85) + "\n");
      } else if (btn2.pressed) {
        grbl2Serial.write(String((char)0x85) + "\n");
      }
    } else if (btnXPlus.x <= x && x <= btnXPlus.x + btnXPlus.width &&
               btnXPlus.y <= y && y <= btnXPlus.y + btnXPlus.height) {
      if (btn1.pressed) {
        grbl1Serial.write("G91 G0 X10\n");
      } else if (btn2.pressed) {
        grbl2Serial.write("G91 G0 X10\n");
      }
    } else if (btnXMinus.x <= x && x <= btnXMinus.x + btnXMinus.width &&
               btnXMinus.y <= y && y <= btnXMinus.y + btnXMinus.height) {
      if (btn1.pressed) {
        grbl1Serial.write("G91 G0 X-10\n");
      } else if (btn2.pressed) {
        grbl2Serial.write("G91 G0 X-10\n");
      }
    } else if (btnYPlus.x <= x && x <= btnYPlus.x + btnYPlus.width &&
               btnYPlus.y <= y && y <= btnYPlus.y + btnYPlus.height) {
      if (btn1.pressed) {
        grbl1Serial.write("G91 G0 Y10\n");
      } else if (btn2.pressed) {
        grbl2Serial.write("G91 G0 Y10\n");
      }
    } else if (btnYMinus.x <= x && x <= btnYMinus.x + btnYMinus.width &&
               btnYMinus.y <= y && y <= btnYMinus.y + btnYMinus.height) {
      if (btn1.pressed) {
        grbl1Serial.write("G91 G0 Y-10\n");
      } else if (btn2.pressed) {
        grbl2Serial.write("G91 G0 Y-10\n");
      }
    } else if (btnZPlus.x <= x && x <= btnZPlus.x + btnZPlus.width &&
               btnZPlus.y <= y && y <= btnZPlus.y + btnZPlus.height) {
      if (btn1.pressed) {
        grbl1Serial.write("G91 G0 Z10\n");
      } else if (btn2.pressed) {
        grbl2Serial.write("G91 G0 Z10\n");
      }
    } else if (btnZMinus.x <= x && x <= btnZMinus.x + btnZMinus.width &&
               btnZMinus.y <= y && y <= btnZMinus.y + btnZMinus.height) {
      if (btn1.pressed) {
        grbl1Serial.write("G91 G0 Z-10\n");
      } else if (btn2.pressed) {
        grbl2Serial.write("G91 G0 Z-10\n");
      }
    }
  } else {
    if (btn1.pressed) {
      btn1.pressed = false;
    } else if (btn2.pressed) {
      btn2.pressed = false;
    }
  }

  // Draw buttons
  tft.fillScreen(ILI9341_BLACK);
  tft.drawRect(btn1.x, btn1.y, btn1.width, btn1.height, btn1.color);
  tft.setCursor(btn1.x + 10, btn1.y + btn1.height / 2 - 4);
  tft.print(btn1.text);
  tft.drawRect(btn2.x, btn2.y, btn2.width, btn2.height, btn2.color);
  tft.setCursor(btn2.x + 10, btn2.y + btn2.height / 2 - 4);
  tft.print(btn2.text);
  tft.drawRect(btnHome.x, btnHome.y, btnHome.width, btnHome.height, btnHome.color);
  tft.setCursor(btnHome.x + 10, btnHome.y + btnHome.height / 2 - 4);
  tft.print(btnHome.text);
  tft.drawRect(btnReset.x, btnReset.y, btnReset.width, btnReset.height, btnReset.color);
  tft.setCursor(btnReset.x + 10, btnReset.y + btnReset.height / 2 - 4);
  tft.print(btnReset.text);
  tft.drawRect(btnStop.x, btnStop.y, btnStop.width, btnStop.height, btnStop.color);
  tft.setCursor(btnStop.x + 10, btnStop.y + btnStop.height / 2 - 4);
  tft.print(btnStop.text);
  tft.drawRect(btnXPlus.x, btnXPlus.y, btnXPlus.width, btnXPlus.height, btnXPlus.color);
  tft.setCursor(btnXPlus.x + 10, btnXPlus.y + btnXPlus.height / 2 - 4);
  tft.print(btnXPlus.text);
  tft.drawRect(btnXMinus.x, btnXMinus.y, btnXMinus.width, btnXMinus.height, btnXMinus.color);
  tft.setCursor(btnXMinus.x + 10, btnXMinus.y + btnXMinus.height / 2 - 4);
  tft.print(btnXMinus.text);
  tft.drawRect(btnYPlus.x, btnYPlus.y, btnYPlus.width, btnYPlus.height, btnYPlus.color);
  tft.setCursor(btnYPlus.x + 10, btnYPlus.y + btnYPlus.height / 2 - 4);
  tft.print(btnYPlus.text);
  tft.drawRect(btnYMinus.x, btnYMinus.y, btnYMinus.width, btnYMinus.height, btnYMinus.color);
  tft.setCursor(btnYMinus.x + 10, btnYMinus.y + btnYMinus.height / 2 - 4);
  tft.print(btnYMinus.text);
  tft.drawRect(btnZPlus.x, btnZPlus.y, btnZPlus.width, btnZPlus.height, btnZPlus.color);
  tft.setCursor(btnZPlus.x + 10, btnZPlus.y + btnZPlus.height / 2 - 4);
  tft.print(btnZPlus.text);
  tft.drawRect(btnZMinus.x, btnZMinus.y, btnZMinus.width, btnZMinus.height, btnZMinus.color);
  tft.setCursor(btnZMinus.x + 10, btnZMinus.y + btnZMinus.height / 2 - 4);
  tft.print(btnZMinus.text);

  // Read from GRBL 1
  while (grbl1Serial.available()) {
    char c = grbl1Serial.read();
    Serial.write(c);
  }

  // Read from GRBL 2
  while (grbl2Serial.available()) {
    char c = grbl2Serial.read();
    Serial.write(c);
  }
}

该代码使用了 Adafruit_GFX 库和 Adafruit_ILI9341 库来控制迪文屏，使用了 TouchScreen 库来获取触摸屏输入，使用了 SoftwareSerial 库来实现与两个 GRBL 的通信。

在 setup() 函数中，所有的串口都被初始化，并且迪文屏和触摸屏被设置为正常工作。

在 loop() 函数中，首先检查两个 GRBL 是否连接。如果未连接，则发送一些字符来检查它们是否回应。如果回应，则认为它们已连接。

然后，检查触摸屏是否有按钮按下。如果是，则根据按下的按钮发送相应的 G-code 命令到 GRBL。如果不是，则检查之前是否有按钮按下，如果是，则将其重置为未按下状态。最后，绘制所有按钮并检查 GRBL 的串口是否有数据，如果有，则将其打印到串口监视器上。

这是一个基本的代码示例，可以根据实际情况进行修改和扩展。