RPi with an Oscilloscope and Java Embedded: Ready for Benchmarking (Part 7)

It might be better to continue to debug the NIO memory mapped buffer that I was originally thinking should be as fast as C native. I was getting "No device found" error when trying to map the /dev/mem of the Raspberry Pi. So, it might have something to do with the /dev/mem not actually looking like a file to the java.nio APIs.

I'll start adding some debug lines to my NIO code next to see if I can narrow down the issue. Meanwhile, I'll also try taking out the flush() calls and see if I can eke out a bit more speed from the java.io.FileWriter approach...

/*
 * Example Code
 */
      // Set up a GPIO port as a command channel
      FileWriter commandChannel = new 
        FileWriter("/sys/class/gpio/gpio" +
        GpioChannels[0] + "/value");
      // Loop forever with fastest on/off to GPIO pin
      while (true) {
         commandChannel.write(GPIO_ON);
         //commandChannel.flush();               

         commandChannel.write(GPIO_OFF);
         //commandChannel.flush();        
         }
       }