c++ - Arduino Only 只读取一个字符。

Question

该程序用于读取输入，并将其写入 Arduino 的串行监视器中。串口监视器只写一个字符的问题。

void setup()
{
Serial.begin(9600); //Set the serial monitor.
lcd.begin(16, 2); //Set the LCD
}
// Alignment variables
boolean left = true; //Set boolean left to true to begin to display text in middle of screen.
boolean right = false; //Other possible align booleans set to false
boolean select = false;
//Text show/hide variables
boolean show1 = true;  //Both values set to true to display on start up.
boolean show2 = true;
//Serial input
char serialinput [4] = {0}; //For 3 value input, and null character to end.
char line1;
void loop()
 {

 if (Serial.available() > 0) { //If the serial monitor is open it will read a value.
    line1 = Serial.read();
    Serial.print(line1);
    memmove (serialinput, &serialinput[1], 3); //copy the value to memory
    serialinput [2] = Serial.read(); //value is read.
    //if statements for each possible input.

}

Answer 1

Serial.read 不等待字符串结束。如果您尝试读取几个字符(由 [4] 暗示)，您只需要在 serial.read 之后包含一个简短的 delay() 以允许缓冲区有足够的时间完全转储字符串。

if (Serial.available() > 0) { //If the serial monitor is open it will read a value.
 line1 = Serial.read();
 delay(100);
 Serial.print(line1);