Esempio n. 1
0
 private void runReadOnBackground() {
   m_SyncStart.waitAndSync();
   while (!m_StopThread) {
     // In Linux read() from a HID device we always try to read at least as many bytes as there can
     // be in a report
     // the kernel will return with the actual number of bytes in the report (plus one if numbered
     // reports are used)
     // and the data will be preceded with the report number if and only if numbered reports are
     // used, which is
     // kind of stupid because then we need to know this and to know that it is necessary to (be
     // able to!) read
     // the HID descriptor AND parse it. I like the Mac OS and Windows ways better, what a mess the
     // world is!
     int bytes_read = read(m_DeviceHandle, m_InputReportBytes, m_InputReportBytes.length);
     if (m_InputReportListener != null) {
       byte reportID = 0;
       if (m_UsesNumberedReports) {
         reportID = m_InputReportBytes[0];
         bytes_read--;
         System.arraycopy(m_InputReportBytes, 1, m_InputReportBytes, 0, bytes_read);
       }
       m_InputReportListener.onInputReport(this, reportID, m_InputReportBytes, bytes_read);
     }
   }
   m_SyncShutdown.waitAndSync();
 }
Esempio n. 2
0
 @Override
 public synchronized int setOutputReport(byte reportID, byte[] data, int length) {
   if (!m_Open) throw new IllegalStateException("device not open");
   // In Linux write() to HID device data is preceded with the report number only if numbered
   // reports are used
   //
   //   "The first byte of the buffer passed to write() should be set to the report
   //   number.  If the device does not use numbered reports, the first byte should
   //   be set to 0. The report data itself should begin at the second byte."
   //
   //   References:
   //   - https://www.kernel.org/doc/Documentation/hid/hidraw.txt
   //   - http://www.usb.org/developers/hidpage/HID1_11.pdf
   if (m_UsesNumberedReports) m_OutputReportBytes[0] = reportID;
   else m_OutputReportBytes[0] = 0;
   System.arraycopy(data, 0, m_OutputReportBytes, 1, length);
   int len = write(m_DeviceHandle, m_OutputReportBytes, length + 1);
   if (len < 0) return len;
   return len - 1;
 }