Question

代码无法编译，在'，'令牌错误之前给出了预期的primary-expression。我想这是明显的，但我找不到它感谢名单

这是应该运行一些步进电机的代码问题显示在最后一行说“预期的'在'之前'，'令牌' 好吧，我也想知道它是什么类型的错误，所以我可以在将来解决这个问题

/* 
 *  
 */
//step
#define step_1 14
#define step_2 27
//direction
#define dir_1  12
#define dir_2  13
//buttons 
#define go_1 
#define go_2
#define go_3
#define go_4
//enable
#define enbl_1
#define enbl_2
//settings
#define rpms 100.0
#define steps_per_rev 100
#define m_per_s 1 /*microsteps per second */
#define m_per_m (1000000/(steps_per_rev * m_per_s)/(rpms / 60)) /* microseconds per microstep */

uint32_t last_step_time = 0;
uint32_t current_time = 0;
boolean stepping_1 = false;
boolean stepping_2 = false;

void setup() {

 //step
 pinMode(step_1, OUTPUT);
 pinMode(step_2, OUTPUT);
 digitalWrite(step_1, LOW);
 digitalWrite(step_2, LOW);
 //dir
 pinMode(dir_1, OUTPUT);
 pinMode(dir_2, OUTPUT);
 digitalWrite(dir_1, LOW);
 digitalWrite(dir_2, LOW);
 //enbl
 pinMode(enbl_1, INPUT);
 pinMode(enbl_2, INPUT);
 digitalWrite(enbl_1, HIGH);
 digitalWrite(enbl_2, HIGH);
 //go
 pinMode(go_1, INPUT);
 pinMode(go_2, INPUT);
 pinMode(go_3, INPUT);
 pinMode(go_4, INPUT);

}


void loop() {

 stepping_1 = true;

 if (digitalRead(go_1) == LOW && stepping_1 == true)
 {
    current_time = micros(); // returns the time gone from the moment when the program has been runned
    if ((current_time - last_step_time) > m_per_m)
    {
      digitalWrite(enbl_1, LOW);
      digitalWrite(dir_1, LOW);
      last_step_time = current_time;
      digitalWrite(step_1, HIGH);
      delayMicroseconds((m_per_m * 0.9)/2);
      digitalWrite(step_1, LOW);
      delayMicroseconds((m_per_m * 0.9)/2);
      digitalWrite(enbl_1, HIGH);
    }
  }


 if (digitalRead(go_2) == LOW && stepping_1 == true)
 {
    current_time = micros(); // returns the time gone from the moment when the program has been runned
    if ((current_time - last_step_time) > m_per_m)
    {
      digitalWrite(enbl_1, LOW);
      digitalWrite(dir_1, HIGH);
      last_step_time = current_time;
      digitalWrite(step_1, HIGH);
      delayMicroseconds((m_per_m * 0.9)/2);
      digitalWrite(step_1, LOW);
      delayMicroseconds((m_per_m * 0.9)/2);
      digitalWrite(enbl_1, HIGH);
    }
  }

  if (digitalRead(go_3) == LOW && stepping_1 == true)
 {
    current_time = micros(); // returns the time gone from the moment when the program has been runned
    if ((current_time - last_step_time) > m_per_m)
    {
      digitalWrite(enbl_2, LOW);
      digitalWrite(dir_2, LOW);
      last_step_time = current_time;
      digitalWrite(step_2, HIGH);
      delayMicroseconds((m_per_m * 0.9)/2);
      digitalWrite(step_2, LOW);
      delayMicroseconds((m_per_m * 0.9)/2);
      digitalWrite(enbl_2, HIGH);
    }
  }

  if (digitalRead(go_4) == LOW && stepping_1 == true)
 {
    current_time = micros(); // returns the time gone from the moment when the program has been runned
    if ((current_time - last_step_time) > m_per_m)
    {
      digitalWrite(enbl_2, LOW);
      digitalWrite(dir_2, HIGH);
      last_step_time = current_time;
      digitalWrite(step_2, HIGH);
      delayMicroseconds((m_per_m * 0.9)/2);
      digitalWrite(step_2, LOW);
      delayMicroseconds((m_per_m * 0.9)/2);
      digitalWrite(enbl_2, HIGH);
    }
  }
}

Answer 1

#define语句必须包含两个部分 - 别名/名称，以及它被定义为什么。如果您没有第二部分，则预处理器会将空白空间替换为您定义的名称。以下所有名称在您的程序中都未正确定义：

#define go_1 
#define go_2
#define go_3
#define go_4
//enable
#define enbl_1
#define enbl_2

这导致预处理后pinMode(go_1, INPUT);等行变为pinMode(, INPUT);。

我还强烈建议您为定义使用全部大写，因为这将明确区分它们与实际变量。这很重要，因为定义的别名被替换为文字值，因此无法修改。

“在'之前预期的初级表达'，'令牌”你能找到一个错误，因为我做不到

1 个答案: