Question

请有人帮忙，我不知道为什么我得到这些错误代码该代码用于控制arduino汽车，其方向取决于安装在其上的光阻接收最多的光线

error: a function-definition is not allowed here before '{' token

   void stop_all(){

                  ^

对于C ++ / arduino非常新，请帮助

//motor A---left
int ENA = 5;
int IN1 = 6;
int IN2 = 7;

//motor B---right
int ENB = 10;
int IN3 = 8;
int IN4 = 9;

//setup motorspeed
int motorspeeda = 100;
int motorspeedb = 140;// robot was veering slightly to the left,, increasing left motor speed makes it drive straight

//define light resistor pins
int resistor1 = A0;
int resistor2 = A2;
int resistor3 = A4;

//largest resistor constantly changes but needs to be declared outside of the if statements
int largestResistor = 0;

void setup() {

//initialise pins as outputs
//pins defualt to input so light resistors don't need to be changed
pinMode(ENA, OUTPUT);
pinMode(IN1, OUTPUT);
pinMode(IN2, OUTPUT);
pinMode(ENB, OUTPUT);
pinMode(IN3, OUTPUT);
pinMode(IN4, OUTPUT);

// turn serial port on
  Serial.begin(9600);

//read resistor values from pins
  int res1 = analogRead(resistor1);
  int res2 = analogRead(resistor2);
  int res3 = analogRead(resistor3);


//function for robot to stop
  void stop_all(){
  analogWrite(ENA,LOW);
  digitalWrite(IN2, LOW);
  digitalWrite(IN1, LOW);
  analogWrite(ENB,LOW);
  digitalWrite(IN3, LOW );
  digitalWrite(IN4, LOW);
      }

//function for robot to go forward
  void forward(){
  analogWrite(ENA, motorspeeda);
  digitalWrite(IN2, LOW);
  digitalWrite(IN1, HIGH);
  analogWrite(ENB, motorspeedb);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
    }


//function for robot to go backwards
  void backwards(){
  analogWrite(ENA,motorspeeda);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN1, LOW);
  analogWrite(ENB,motorspeedb);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
    }

//function for robot to go right
  void turnRight(){
  if(millis() < 600){
  analogWrite(ENA,motorspeeda);
  digitalWrite(IN2, LOW);
  digitalWrite(IN1, HIGH);
  analogWrite(ENB,motorspeedb);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, LOW);
      }
      else if(millis() < 1500){
        forward();
        }
        else{
          stop_all();
          }
  }

//function for robot to go left
  void turnLeft(){
    if(millis() < 600){
      analogWrite(ENA,motorspeeda);
      digitalWrite(IN2, LOW);
      digitalWrite(IN1, LOW);
      analogWrite(ENB,motorspeedb);
      digitalWrite(IN3, HIGH);
      digitalWrite(IN4, LOW);
      }
      else if(millis() < 1500){
        forward();
        }
        else{
          stop_all();
          }
  }

  }

void loop(){

if(millis() < 30000){ //if less than 30 secs elapsed run code,, otherwise run stop function
turnLeft();

}


else{stop_all();}
}

Answer 1

您正在尝试在函数内部定义函数。

你不能那样做。

停止这样做。

改为在名称空间范围内定义函数。

如果是错误的原因是由于缺少}，那是因为您的缩进很糟糕。

正确缩进代码，以便您可以发现它。

Answer 2

您只是错过了}来关闭setup（）函数。

没有括号时，输入末尾应为'}'

2 个答案: