用隔壁dfrobot的Romeo BLE Mini，但串口没有显示，所以没有办法上传，但代码我验证过了，是正确的，怎么回事
问题遇到的现象和发生背景
问题相关代码，请勿粘贴截图
//Standard PWM DC control
int E1 = 5; //M1 Speed Control
int E2 = 6; //M2 Speed Control
int M1 = 4; //M1 Direction Control
int M2 = 7; //M1 Direction Control
void stop(void) //Stop
{
digitalWrite(E1,LOW);
digitalWrite(E2,LOW);
}
void advance(char a,char b) //Move forward
{
analogWrite (E1,a); //PWM Speed Control
digitalWrite(M1,HIGH);
analogWrite (E2,b);
digitalWrite(M2,HIGH);
}
void back_off (char a,char b) //Move backward
{
analogWrite (E1,a);
digitalWrite(M1,LOW);
analogWrite (E2,b);
digitalWrite(M2,LOW);
}
void turn_L (char a,char b) //Turn Left
{
analogWrite (E1,a);
digitalWrite(M1,LOW);
analogWrite (E2,b);
digitalWrite(M2,HIGH);
}
void turn_R (char a,char b) //Turn Right
{
analogWrite (E1,a);
digitalWrite(M1,HIGH);
analogWrite (E2,b);
digitalWrite(M2,LOW);
}
void setup(void)
{
int i;
for(i=4;i<=7;i++)
pinMode(i, OUTPUT);
Serial.begin(9600); //Set Baud Rate
Serial.println("Run keyboard control");
}
void loop(void)
{
if(Serial.available()){
char val = Serial.read();
if(val != -1)
{
switch(val)
{
case 'w'://Move Forward
advance (255,255); //move forward in max speed
break;
case 's'://Move Backward
back_off (255,255); //move back in max speed
break;
case 'a'://Turn Left
turn_L (100,100);
break;
case 'd'://Turn Right
turn_R (100,100);
break;
case 'z':
Serial.println("Hello");
break;
case 'x':
stop();
break;
}
}
else stop();
}
}
运行结果及报错内容
Arduino:1.8.12 (Windows 7), 开发板："Arduino Uno"
项目使用了 4964 字节，占用了 (15%) 程序存储空间。最大为 32256 字节。
全局变量使用了430字节，(20%)的动态内存，余留1618字节局部变量。最大为2048字节。
avrdude: ser_open(): can't open device "\.\COM3": ϵͳ�Ҳ���ָ�����ļ���
上传出错。查看http://www.arduino.cc/en/Guide/Troubleshooting#upload 获取建议。
在文件 -> 首选项开启
“编译过程中显示详细输出”选项
这份报告会包含更多信息。
我曾换过1.6.9版本的arduino ide,数据线也换过两次,那两条都是可以上传esp8266,串口也安装好的,可也是上传不上去