davideserra
commented
2 years ago 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.
FDelporte
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.(RotorControl.java:38)
at skywalker.Main.(Main.java:298)
at skywalker.Main.lambda$main$1(Main.java:4073)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Anyone can help me? Thanks very much!