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POJava byte/bit trouble
 

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  1. POJava byte/bit trouble
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    <pre><code>import jssc.SerialPort; import jssc.SerialPortException; import org.jfree.ui.RefineryUtilities; public class Main { public static int gyro_out_X, gyro_out_Y, gyro_out_Z, acc_out_X, acc_out_Y, acc_out_Z, adc_pressure, HMC_xo, HMC_yo, HMC_zo; public static void main(String[] args) { //In the constructor pass the name of the port with which we work SerialPort serialPort = new SerialPort("COM4"); try { //Open port serialPort.openPort(); //We expose the settings. You can also use this line - serialPort.setParams(9600, 8, 1, 0); serialPort.setParams(SerialPort.BAUDRATE_115200, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); while (1 == 1) { byte[] sensor_buffer = serialPort.readBytes(21); gyro_out_X = ((sensor_buffer[1] &lt;&lt; 8) + sensor_buffer[2]); gyro_out_Y = ((sensor_buffer[3] &lt;&lt; 8) + sensor_buffer[4]); gyro_out_Z = ((sensor_buffer[5] &lt;&lt; 8) + sensor_buffer[6]); acc_out_X = ((sensor_buffer[7] &lt;&lt; 8) + sensor_buffer[8]); acc_out_Y = ((sensor_buffer[9] &lt;&lt; 8) + sensor_buffer[10]); acc_out_Z = ((sensor_buffer[11] &lt;&lt; 8) + sensor_buffer[12]); HMC_xo = ((sensor_buffer[13] &lt;&lt; 8) + sensor_buffer[14]); HMC_yo = ((sensor_buffer[15] &lt;&lt; 8) + sensor_buffer[16]); HMC_zo = ((sensor_buffer[17] &lt;&lt; 8) + sensor_buffer[18]); System.out.println("gyro_out_X: " + gyro_out_X ); //Closing the port // serialPort.closePort(); } } catch (SerialPortException ex) { System.out.println(ex); } } } </code></pre> <p>OK, in this construction I read 21 byte of code, 1 byte go to &lt;&lt;8 bits, and then I plus another byte, what gives me values from -255 to 255. </p> <p>But in output I see:</p> <pre><code> gyro_out_X: 14556 gyro_out_X: 23857 gyro_out_X: -15234 gyro_out_X: -255 gyro_out_X: 23295 gyro_out_X: -13346 gyro_out_X: -255 gyro_out_X: 30813 gyro_out_X: 12506 gyro_out_X: -255 gyro_out_X: 5104 gyro_out_X: -10220 gyro_out_X: 23807 gyro_out_X: 5246 gyro_out_X: -463 gyro_out_X: -27536 gyro_out_X: -511 gyro_out_X: -8640 gyro_out_X: 4306 gyro_out_X: 16448 gyro_out_X: 21075 gyro_out_X: 16450 gyro_out_X: 220 gyro_out_X: 16448 </code></pre> <p>Data sent every 10 ms.</p> <p>What I do wrong?</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USdsolimano
    1. USJohnDow
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COAnd what is your question?
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      1. POJava byte/bit trouble
      1. USSome programmer dude
    2. CO23857 and -13346 not in -255 +255 set. What I do wrong?
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      1. POJava byte/bit trouble
      1. USJohnDow
    3. CODo you want to fit a 2-byte value into the `[-255..+255]` range? Have you examined the `sensor_buffer` contents?
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      1. POJava byte/bit trouble
      1. USAlexander Pavlov
 

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