ttww / javaframebuffer Goto Github PK
View Code? Open in Web Editor NEWAcces to Linux frame buffer devices from Java. E.g. for driving LCD SPI displays on the Raspberry Pi
Acces to Linux frame buffer devices from Java. E.g. for driving LCD SPI displays on the Raspberry Pi
I know this is old code but I was able to use it with Java 11 on RPI 3+ with Buster.
I found this c code for hiding/unhiding the cursor. Is there are way to implement this into your code? Or is there something already implemented in your code that I missed?
void fbcon_cursor (int blank)
{
int fd = open("/dev/tty1", O_RDWR);
if(0 < fd)
{
write(fd, "\033[?25", 5);
write(fd, blank ? "h" : "l", 1);
}
close(fd);
}
void fbcon_blank (int blank)
{
ioctl(fb.fd, FBIOBLANK, blank ? VESA_POWERDOWN: VESA_NO_BLANKING);
return;
}
where fb.fd is the fd for /dev/fb0. Works for me, anyway.
Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: /lib/libFrameBufferJNI.so: /lib/libFrameBufferJNI.so: cannot open shared object file: No such file or directory (Possible cause: can't load ARM-bit .so on a IA 32-bit platform)
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary1(ClassLoader.java:1965)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1890)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1880)
at java.lang.Runtime.loadLibrary0(Runtime.java:849)
at java.lang.System.loadLibrary(System.java:1088)
at demoframebuffer.FrameBuffer.(FrameBuffer.java:75)
at demoframebuffer.TestFrameBuffer.(TestFrameBuffer.java:35)
at demoframebuffer.TestFrameBuffer$2.run(TestFrameBuffer.java:145)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
GOOD!
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