Arduino IDE:在“”标记之前不允许函数定义
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【中文标题】Arduino IDE:在“”标记之前不允许函数定义【英文标题】:Arduino IDE: a function-definition is not allowed here before '' tokenArduino IDE:在“”标记之前不允许函数定义 【发布时间】:2021-06-23 14:00:35 【问题描述】:我为我的家庭工作室准备了一个 DIY MIDI 脚踏板,有两个按钮被编程用于向 MIDI 输出发送信号,然后我的 DAW 接收并解释为 MIDI 控制器。
现在一切正常,但突然间 Arduino IDE 开始在我的代码中发现问题,因此我无法对代码进行任何编辑以添加更多功能。
这是代码(顺便说一句,在 Arduino Uno 中完美运行):
// define pins
const int switchPin1 = 2;
const int switchPin2 = 3;
// midi notes
char note1 = 60; //Middle C
char note2 = 62; //D
// variables
int switchState1 = LOW;
int switchState2 = LOW;
int currentSwitchState1 = LOW;
int currentSwitchState2 = LOW;
void setup()
// set the states of the I/O pins:
pinMode(switchPin1, INPUT);
pinMode(switchPin2, INPUT);
// set MIDI baud rate :
Serial.begin(31250);
void loop()
currentSwitchState1 = digitalRead(switchPin1);
currentSwitchState2 = digitalRead(switchPin2);
// button 1 push
if (currentSwitchState1 == HIGH && switchState1 == LOW)
noteOn(0x94, note1, 0x45);
delay(100);
noteOn(0x94, note1, 0x00);
switchState1 = HIGH;
// button 1 release
if (currentSwitchState1 == LOW && switchState1 == HIGH)
switchState1 = LOW;
// button 2 push
if (currentSwitchState2 == HIGH && switchState2 == LOW)
noteOn(0x94, note2, 0x45);
delay(100);
noteOn(0x94, note2, 0x00);
switchState2 = HIGH;
// button 2 release
if (currentSwitchState2 == LOW && switchState2 == HIGH)
switchState2 = LOW;
void noteOn(char cmd, char data1, char data2)
Serial.print(cmd);
Serial.print(data1); Serial.print(data2);
这是我得到的错误日志:
Arduino: 1.8.15 (Windows Store 1.8.49.0) (Windows 10), Board: "Arduino Uno"
C:\Users\CrazyCringeComplex\Desktop\MIDI Pedal\midipedal\midipedal.ino: In function 'void loop()':
midipedal:46:5: error: 'noteOn' was not declared in this scope
noteOn(0x94, note1, 0x45);
^~~~~~
C:\Users\CrazyCringeComplex\Desktop\MIDI Pedal\midipedal\midipedal.ino:46:5: note: suggested alternative: 'note2'
noteOn(0x94, note1, 0x45);
^~~~~~
note2
midipedal:58:5: error: 'noteOn' was not declared in this scope
noteOn(0x94, note2, 0x45);
^~~~~~
C:\Users\CrazyCringeComplex\Desktop\MIDI Pedal\midipedal\midipedal.ino:58:5: note: suggested alternative: 'note2'
noteOn(0x94, note2, 0x45);
^~~~~~
note2
midipedal:68:49: error: a function-definition is not allowed here before '' token
void noteOn(char cmd, char data1, char data2)
^
exit status 1
'noteOn' was not declared in this scope
据我所知,所有这些错误都可以追溯到“不允许定义函数”。通过在互联网上研究问题,我发现这通常是由于缩进不当造成的。 Homever,我在我的代码中找不到任何丢失的括号或类似内容,并且我多次自动格式化所有内容。
谁能帮我解决这个问题?谢谢(:
【问题讨论】:
>code (that works flawlessly in the Arduino Uno by the way)
? ? ?
【参考方案1】:
您的代码中的问题是您在void loop()
函数中声明了void noteOn()
函数。你永远不应该在另一个函数中声明一个函数。您需要在void setup(),
之前或void loop().
之后声明void noteOn()
函数,我已修复它。这是工作代码:
const int switchPin1 = 2;
const int switchPin2 = 3;
// midi notes
char note1 = 60; //Middle C
char note2 = 62; //D
// variables
int switchState1 = LOW;
int switchState2 = LOW;
int currentSwitchState1 = LOW;
int currentSwitchState2 = LOW;
void noteOn(char cmd, char data1, char data2) // Always declare it before void setup
Serial.print(cmd);
Serial.print(data1); Serial.print(data2);
void setup()
// set the states of the I/O pins:
pinMode(switchPin1, INPUT);
pinMode(switchPin2, INPUT);
// set MIDI baud rate :
Serial.begin(31250);
void loop()
currentSwitchState1 = digitalRead(switchPin1);
currentSwitchState2 = digitalRead(switchPin2);
// button 1 push
if (currentSwitchState1 == HIGH && switchState1 == LOW)
noteOn(0x94, note1, 0x45);
delay(100);
noteOn(0x94, note1, 0x00);
switchState1 = HIGH;
// button 1 release
if (currentSwitchState1 == LOW && switchState1 == HIGH)
switchState1 = LOW;
// button 2 push
if (currentSwitchState2 == HIGH && switchState2 == LOW)
noteOn(0x94, note2, 0x45);
delay(100);
noteOn(0x94, note2, 0x00);
switchState2 = HIGH;
// button 2 release
if (currentSwitchState2 == LOW && switchState2 == HIGH)
switchState2 = LOW;
【讨论】:
当然,谢谢!现在它正在工作(:以上是关于Arduino IDE:在“”标记之前不允许函数定义的主要内容,如果未能解决你的问题,请参考以下文章
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