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A class I wrote as an utility when dealing with byte data. It can create bytes out of nibbles, words out of bytes and break words into a byte lists. All inputs are validated and the exceptions are raised.
class HexTools():
"""
Performs simple operations on byte or word data
"""
MAX_VALUE_FOR_BYTE = 0xFF
MAX_VALUE_FOR_WORD = 0xFFFF
MAX_VALUE_FOR_NIBBLE = 0x0F
@staticmethod
def getHighNibbleFromByte(byte=0):
if byte > HexTools.MAX_VALUE_FOR_BYTE:
raise ValueError("value must be an integer less than 256")
if not isinstance(byte, int):
raise ValueError("value must be an integer less than 256")
byte = (byte >> 4) & 0x0F
#print hex(byte)
return byte
@staticmethod
def getLowNibbleFromByte(byte=0):
if byte > HexTools.MAX_VALUE_FOR_BYTE:
raise ValueError("value must be an integer less than 256")
if not isinstance(byte, int):
raise ValueError("value must be an integer less than 256")
byte = (byte) & 0x0F
#print hex(byte)
return byte
@staticmethod
def getWordFromBytes(msb=0x00, lsb=0x00):
"""
raises TypeError
"""
word = msb << 8
word += lsb
return word
@staticmethod
def getByteFromNibbles(ms, ls):
"""
raises TypeError
"""
if ms > HexTools.MAX_VALUE_FOR_NIBBLE or ls > HexTools.MAX_VALUE_FOR_NIBBLE:
raise TypeError
byte = (ms << 4) & 0xF0
byte |= ls
return byte
@staticmethod
def getByteListFromWord(word):
"""
raises TypeError
"""
if word > HexTools.MAX_VALUE_FOR_WORD:
raise TypeError
highByte = (word >> 8) & 0x00FF
lowByte = (word) & 0x00FF
byteList = []
byteList.append(highByte)
byteList.append(lowByte)
return byteList
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