pi4j-v1
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Pi4J
Serial Port won't open
Hi everyone,
I'm in migration phase of my project from Raspberry PI 3B+ on Raspberry 4B due "low System Memory" error in previous version. I buyed Raspberry PI4 8 Gbytes Version, with a 64 bit Operating System ad I migrate my NetBeans project. The appliance is a Radio Telescope with 1 Raspebrry PI4 as central Unit connected to 4 Arduino Due platform. In the main unit I has written in Java (with NetBeans) a main program that comunicate with the Arduino on COM port "/dev/ttyACMxxx" for read radio data and pilot he azimuth and altitude rotor. The oldest version works fine (until the memory problem). I download 64 bit version of pi4j, then set the code as follow:
Rotorconfig = new SerialConfig();
Rotorconfig.device(RotorPortName);
Rotorconfig.baud(Baud._57600);
Rotorconfig.dataBits(DataBits._8);
Rotorconfig.parity(Parity.NONE);
Rotorconfig.stopBits(StopBits._1);
Rotorconfig.flowControl(FlowControl.NONE);
RotorPort.open(Rotorconfig);
I have also a listener to serial event but this happen after the port open (as like as previous version)
Rotor = new RotorControl(RotorPortName);
Rotor.RotorPort.addListener((SerialDataEventListener) new SerialDataEventListener() {
@Override
public void dataReceived(SerialDataEvent sde) {
String Data = "";
try
{
Data = sde.getAsciiString();
int AziPos = Data.indexOf("AZI");
int AltPos = Data.indexOf("ALT");
if(AziPos >= 0){
try{
int EndData = Data.indexOf(";", AziPos);
if(EndData > AziPos){
String Azimuth = Data.substring(AziPos + 5, EndData);
//jTextField1.setText(Azimuth);
jTextField1.setText(Rotor.GetAzimuthValue(Azimuth));
saveProperties();
if(AzimuthGo){
int Delta = Math.abs(Integer.valueOf(AzimuthToGo) - Integer.valueOf(Azimuth));
if(Delta < 2) {
AzimuthGo = false;
Rotor.AzimuthStop();
loadProperties();
}
}
}
}catch(Exception ex){
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
if(AltPos >= 0){
try{
int EndData = Data.indexOf(";", AltPos);
if(EndData > AltPos){
String Altitude = Data.substring(AltPos + 5, EndData);
//jTextField2.setText(Altitude);
jTextField2.setText(Rotor.GetAltitudeValue(Altitude));
saveProperties();
if(AltitudeGo){
int Delta = Math.abs(Integer.valueOf(AltitudeToGo) - Integer.valueOf(Altitude));
if(Delta < 2) {
AltitudeGo = false;
Rotor.AltitudeStop();
loadProperties();
}
}
}
}catch(Exception ex){
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
if(AzimuthGo || AltitudeGo){
jButton16.setEnabled(false);
}
} catch (Exception ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
But on the statement "RotorPort.open(Rotorconfig);" that doesn't work and return this exception:
Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: 'int com.pi4j.jni.Serial.open(java.lang.String, int, int, int, int, int)'
at com.pi4j.jni.Serial.open(Native Method)
at com.pi4j.io.serial.impl.SerialImpl.open(SerialImpl.java:149)
at com.pi4j.io.serial.impl.SerialImpl.open(SerialImpl.java:319)
at skywalker.RotorControl.InizializeRotor(RotorControl.java:55)
at skywalker.RotorControl.
Anyone can help me? Thanks very much!
Following the error I found: "Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: Can't load library: /home/pi/NetBeansProject/SkyWalker/lib/libpi4j.so"
Someone can tell to me wat's that's libpi4j.so? I doesn't find this library in download package.
I didn't install library with provided installer "pi4j-1.4.deb" due to error:
./pi4j-1.3-SNAPSHOT.deb: riga 1: errore di sintassi vicino al token non atteso "newline"
./pi4j-1.3-SNAPSHOT.deb: riga 1: `!
I download zip file "pi4j-1.4.zip", uncompressed and include in my project NetBeans library. The program compile fine without errors but run time compiler search that library and doesn't found.
Thansk for reply: I buy this version: https://www.amazon.it/gp/product/B0899VXM8F/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1