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c++ - 使用 strncmp 函数在 Arduino IDE 中出错

问题描述

我正在使用以下代码比较两个字符串并得到错误：

>  #define _EXFUN(name, proto)  name proto
> 
>                               ^
> 
> exit status 1 invalid conversion from 'char' to 'const char*'
> [-fpermissive]

据我了解，strncmp 函数正在寻找“const char*”，但是当我将“聊天”转换为“const char*”时，我在串行监视器中得到了奇怪的结果：

> Exception (28): epc1=0x40209035 epc2=0x00000000 epc3=0x00000000
> excvaddr=0x00000030 depc=0x00000000
> 
> ctx: cont  sp: 3ffffda0 end: 3fffffd0 offset: 01a0
> 
> >>>stack>>> 3fffff40:  40100fee 3ffe8c3c 000026fe 00000000   3fffff50:  401011c4 000026fe 3ffee75c 00000000   3fffff60:  3ffe8c70 3ffee75c
> 3ffe850c 3ffee75c   3fffff70:  3ffee6e0 3ffee7c8 40202fe8 3fffefb0  
> 3fffff80:  402014ce 00000001 00000001 402014c3   3fffff90:  00002580
> 3ffee6dc 00000014 4020292c   3fffffa0:  feefeffe 00000000 3ffee7c0
> 3ffee7c8   3fffffb0:  3fffdad0 00000000 3ffee7c0 40203074   3fffffc0: 
> feefeffe feefeffe 3ffe850c 401000e5   <<<stack<<< ?)⸮

代码本身：

#include <Wire.h>
#define I2C_ESP_ADDRESS 8
int count=0;
char model;
char reading;
char incoming;

void setup()
{
    Serial.begin(9600);
    Wire.begin(5,4);//Change to Wire.begin() for non ESP.
    /*model[0] = "e";
    model[1] = "0";
    for (int i = 1; i < 20; i++) {
        model[i] = 0;
    }*/
}

void loop()
{     
    Wire.requestFrom(I2C_ESP_ADDRESS,20);
    while (Wire.available())
    {
        delay(1);
        incoming = Wire.read();

        if (strncmp(incoming,"elxxxxxxxxxxxxxxxxxx",2) == 1 ) {
            model = incoming;
        } else { 
            reading = incoming;
        }
    }
}

标签： c++carduinostrncmp

解决方案

所以这是对我有用的正确代码：

void loop() {

 Wire.requestFrom(I2C_ESP_ADDRESS,18);
 while (Wire.available()){



 incoming = Wire.read();
Serial.print(incoming);
 //Serial.print(incoming);

 //sprintf (incomingArray, "%.20", incoming);

  if ( incoming == 'e') {
    modelArray[0] = 'e';


    for (int i = 1; i < 18; i++ ){
      modelArray[i] = (char) Wire.read();
      Serial.print(modelArray[i-1]);
    }
  } 



    if ( incoming == 'a') {
    readingArray[0] = 'a';
   // Serial.print("Got Reading: ");

    for (int j = 1; j < 18; j++ ){
      readingArray[j] = (char) Wire.read();
      Serial.print(readingArray[j-1]);
    }

    Serial.println();

    }


}

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