我正在尝试向我的Arduino Yun发送一个字符串,并尝试根据我发送的内容回复它。
我在这里选择了一些代码的框架并且一直在试验它,但除了显示“准备好”的串行监视器之外,我无法继续下去。
代码是:
//declace a String to hold what we're inputting
String incomingString;
void setup() {
//initialise Serial communication on 9600 baud
Serial.begin(9600);
while(!Serial);
//delay(4000);
Serial.println("Ready!");
// The incoming String built up one byte at a time.
incomingString = "";
}
void loop () {
// Check if there's incoming serial data.
if (Serial.available() > 0) {
// Read a byte from the serial buffer.
char incomingByte = (char)Serial.read();
incomingString += incomingByte;
// Checks for null termination of the string.
if (incomingByte == '\0') {
// ...do something with String...
if(incomingString == "hello") {
Serial.println("Hello World!");
}
incomingString = "";
}
}
}
有人能指出我正确的方向吗?
由于
答案 0 :(得分:0)
我怀疑问题是你在执行以下操作时将空终结符添加到字符串的末尾:incomingString += incomingByte
。当您使用字符串对象(而不是原始char *
字符串)时,您不需要这样做。该对象将自行处理终止。
结果是您的if
条件实际上是这样做的:if ("hello\0" == "hello") ...
。显然他们不平等,所以情况总是失败。
我认为解决方案只是确保如果字节为空,则不附加字节。
答案 1 :(得分:0)
试试这个:
String IncomingData = "";
String Temp = "";
char = var;
void setup()
{
Serial.begin(9600);
//you dont have to use it but if you want
// if(Serial)
{
Serial.println("Ready");
}
//or
while(!Serial)
{delay(5);}
Serial.println("Ready");
void loop()
{
while(Serial.available())
{
var = Serial.read();
Temp = String(var);
IncomingData+= Temp;
//or
IncomingData.concat(Temp);
// you can try
IncomindData += String(var);
}
Serial.println(IncomingData);
IncomingData = "";
}