#include <Keyboard.h>
void setup() {
   Keyboard.begin();
   Serial.begin(9600);
   while(Serial.read()>=0){}
}

void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available()>0){
    delay(100);
    char Comm=Serial.read();
    char x;
    String Comdata;
    switch(Comm){
      case 0:                                    //获取版本
        Serial.print("Ver 0.1");
        break;
      case 1:                                    //模拟按下
        x=Serial.read();
        Keyboard.press(x);
      case 2:                                    //模拟弹起
        x=Serial.read();
        Keyboard.release(x);
      case 3:                                    //模拟打印字符
        Comdata=Serial.readString();
        Keyboard.print(Comdata);
      case 4:                                    //释放所有按键
        Keyboard.releaseAll();
    }
    while(Serial.read()>=0){}            //清空缓冲区
  }
}