eu.javaexperience.electronic.uartbus.UartbusTools Class Reference

Collaboration diagram for eu.javaexperience.electronic.uartbus.UartbusTools:

Classes
enum	PacketFormattingMode

Static Public Member Functions
static byte	crc8 (byte[] data)
static byte	crc8 (byte[] data, int length)
static byte []	parseColonData (String data)
static String	formatColonData (byte[] e)
static String	formatColonDataWithValidation (byte[] e)
static String	formatPacketWithMode (PacketFormattingMode mode, byte[] data)
static int	packValue (boolean signed, int value, byte[] dst, int startIndex)
static int	packValue (boolean signed, long value, byte[] dst, int startIndex)
static int	packValue (boolean signed, BigInteger value, byte[] dst, int startIndex)
static int	calcPackReqBytes (boolean signed, BigInteger value)
static int	calcPackReqBytes (boolean signed, byte[] value)
static int	packValue (Boolean negative, byte[] value, byte[] dst, int startIndex)
static byte []	packInt (boolean signed, int value)
static BigInteger	unpackValue (boolean signed, byte[] data, int startIndex)
static BigInteger	unpackValue (boolean signed, byte[] data, int startIndex, int[] usedBytes)
static byte []	getValidPacket (byte[] e)
static boolean	isPacketCrc8Valid (byte[] data)
static void	printPacketStdout (byte[] data)
static void	initConnection (UartbusConnection conn)

Static Protected Attributes
static final Logger	LOG = JavaExperienceLoggingFacility.getLogger(new Loggable("UartbusTools"))

Detailed Description

Definition at line 16 of file UartbusTools.java.

Member Function Documentation

packValue()

static int eu.javaexperience.electronic.uartbus.UartbusTools.packValue ( Boolean  negative, byte []  value, byte []  dst, int  startIndex  )

inlinestatic

packed byte scheme: XN---—|X----—|X----—

first byte: X extended address (0 = no, 1 = yes) N negated value (0 = no, 1 = yes)

n'th byte: X value continued in the next byte + 7 bit number value

negative: null: unsigned value false: signed positive true: signed negative

Definition at line 218 of file UartbusTools.java.

    {
        if(0 == value.length)
        {
            if(Boolean.TRUE == negative)
            {
                dst[startIndex] = 0x40;
            }
            else
            {
                dst[startIndex] = 0;
            }
            return 1;
        }
        
        int sReq = calcPackReqBytes(null != negative, value);
        
        int off = 0;
        int index = value.length-1;
        
        for(int i = sReq-1;i >=0;--i,--index)
        {
            int val = 0;
            if(0 == off)//value from the same byte
            {
                val = value[index];//bit offset
            }
            else//different bytes
            {
                val = (0xff & value[index+1]) >> (8-off);
                if(index >= 0)
                {
                    val |= (0xff & value[index]) << off;
                }
            }
            
            val &= 0x7f;
            
            if(++off == 8)
            {
                off = 0;
                index += 1;
            }
            
            if(i != sReq-1)
            {
                val |= 0x80;
            }
            
            if(Boolean.TRUE == negative && i == 0)
            {
                val |= 0x40;
            }
            
            dst[startIndex+i] = (byte) val;
        }
        
        return sReq;
    }

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The documentation for this class was generated from the following file:

• /home/javaexperience/git-repositories/javaexperience/uartbus/source/java/uartbus/src/main/java/eu/javaexperience/electronic/uartbus/UartbusTools.java