我正在尝试使用jssc与Java通信arduino。仅出于测试目的,我试图直接在Arduino上接收数据并将其发送回PC。问题是,董事会似乎没有收到。当arduino可以发送的代码可以正常工作时,却无法接收任何数据。我首先认为问题是jssc,所以我将应用程序更改为Processing,同样的问题。我什至尝试更换板子,没有区别,板子很好,它可以与Arduino Serial Monitor正常通信。所以我的问题一定是Java和Processing代码。我知道这是一个非常简单的问题,对此我感到posting愧,这肯定是我过去的一个非常简单的问题。
另一件事,完全没有错误显示
Java代码:
public class ArduinoTest{
public static void main(String[] args) throws SerialPortException, InterruptedException {
SerialPort serialPort = new SerialPort("COM6");
serialPort.openPort();
serialPort.setParams(SerialPort.BAUDRATE_9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
int i;
serialPort.writeBytes("a".getBytes());
while(true){
a=serialPort.readBytes(1);
i = a[0] & 0xff;
System.out.println(i);
}
}
}
处理代码:
import processing.serial.*;
Serial port;
int r;
void setup(){
port = new Serial(this, "COM6", 9600);
port.write(1);
}
void draw(){
if(port.available()>0){
r = port.read();
println(r);
}
}
Arduino代码:
int r1=0;
void setup() {
Serial.begin(9600);
}
void loop() {
if(Serial.available() > 0){
r1 = Serial.read();
Serial.write(r1);
}
}
答案 0 :(得分:2)
这是Arduino的有效通信代码:
const int led_pin = 13; // Initializing the LED pin internal led
String char_output = ""; // Declaring a variable for output
void setup ( ) {
pinMode(led_pin, OUTPUT); // Declaring the LED pin as output pin
Serial.begin(9600); // Starting the serial communication at 9600 baud rate
}
void loop ( ) {
if (Serial.available ( ) > 0) { // Checking if the Processing IDE has send a value or not
char state = Serial.read ( ); // Reading the data received and saving in the state variable
if (state == '1') { // If received data is '1', then turn on LED
digitalWrite (led_pin, HIGH);
char_output = "Led on";
}
if (state == '0') { // If received data is '0', then turn off led
digitalWrite (led_pin, LOW);
char_output = "Led off";
}
}
delay(50);
Serial.println (char_output); // Sending the output to Processing IDE
}
这是处理部分:
import processing.serial.*; // Importing the serial library to communicate with the Arduino
Serial myPort; // Initializing a vairable named 'myPort' for serial communication
float background_color ; // Variable for changing the background color
void setup ( ) {
size (500, 500); // Size of the serial window, you can increase or decrease as you want
myPort = new Serial (this, "COM3", 9600); // Set the com port and the baud rate according to the Arduino IDE
myPort.bufferUntil ( '\n' ); // Receiving the data from the Arduino IDE
}
void serialEvent (Serial myPort) {
background_color = float (myPort.readStringUntil ( '\n' ) ) ; // Changing the background color according to received data
}
void draw ( ) {
background ( 150, 50, background_color ); // Initial background color, when we will open the serial window
if ( mousePressed && ( mouseButton == LEFT ) ) { // if the left mouse button is pressed
myPort.write ( '1' ) ; // send a '1' to the Arduino IDE
}
if ( mousePressed && ( mouseButton == RIGHT ) ) { // if the right mouse button is pressed
myPort.write ( '0' ) ; // Send a '0' to the Arduino IDE
}
}
阅读评论,发现从串行读取和从打印到串行是分开的
答案 1 :(得分:0)
刚刚解决了这个问题,我的代码无法正常工作,因为我是在打开命令后立即在端口上进行写操作的,这样,端口尚未打开,请使用Thread.sleep(1000)解决问题。在Java代码上。当端口打开时,我必须实现一些方法来告诉我。