def test_xor_hwcrc16_random(self):
dataSize = 24
data1 = random.randint(1, 0xFFFFFF)
data2 = random.randint(1, 0xFFFFFF)
crcSize = 16
inputPoly = 0x10000 | random.randint(1, 0xFFFF)
regInit = random.randint(1, 0xFFFF)
xorOut = random.randint(1, 0xFFFF)
crcFun = HwCRC()
crcFun.setReversed(False)
crcFun.setXorOutValue(xorOut)
crcFun.setRegisterInitValue(regInit)
crc1 = crcFun.calculate2(data1, dataSize, inputPoly, crcSize)
crc2 = crcFun.calculate2(data2, dataSize, inputPoly, crcSize)
xdata = data1 ^ data2
crcFunXor = HwCRC()
crcFunXor.setReversed(False)
xcrc = crcFunXor.calculate2(xdata, dataSize, inputPoly, crcSize)
xorcrc = crc1 ^ crc2
# print "xor: d1:{:X} {:X} d2:{:X} {:X} r:{:X} xo:{:X} xor:{:X} {:X} {:X}".format( data1, crc1, data2, crc2, regInit, xorOut, xdata, xcrc, xorcrc )
self.assertEquals(xcrc, xorcrc)
def test_calculate_1(self):
crcProc = HwCRC()
crc = crcProc.calculate2(0b1, 1, 0b1, 1)
self.assertEqual(crc, 0b1)
crc = crcProc.calculate2(0b0, 1, 0b1, 1)
self.assertEqual(crc, 0b0)
crc = crcProc.calculate2(0b10, 2, 0b1, 1)
self.assertEqual(crc, 0b1)
crc = crcProc.calculate2(0b01, 2, 0b1, 1)
self.assertEqual(crc, 0b1)
def test_calculate_2(self):
crcProc = HwCRC()
crc = crcProc.calculate2(0b00, 2, 0b11, 2)
self.assertEqual(crc, 0b00)
crc = crcProc.calculate2(0b01, 2, 0b11, 2)
self.assertEqual(crc, 0b11)
crc = crcProc.calculate2(0b10, 2, 0b11, 2)
self.assertEqual(crc, 0b01)
crc = crcProc.calculate2(0b11, 2, 0b11, 2)
self.assertEqual(crc, 0b10)
def test_calculate3_8rev_init_xor(self):
data = 0xF0
dataSize = 8
inputPoly = 0x107
crcSize = 8
regInit = 0x0F
xorOut = 0xF0
crcProc = HwCRC()
crcProc.setRegisterInitValue(regInit)
crcProc.setXorOutValue(xorOut)
crcProc.setReversed()
crc = crcProc.calculate2(data, dataSize, inputPoly, crcSize)
self.assertEqual(crc, 240)
def test_calculate_3(self):
## taken from https://en.wikipedia.org/wiki/Cyclic_redundancy_check
crcProc = HwCRC()
crc = crcProc.calculate2(0b11010011101100, 16, 0b011, 3) ## 0x34EC 0xB
self.assertEqual(crc, 0b100)
crc = crcProc.calculate2(0b11010011101101, 16, 0b011, 3) ## 0x34ED 0xB
self.assertEqual(crc, 0b111)
crc = crcProc.calculate2(0b11010011101110, 16, 0b011, 3) ## 0x34EE 0xB
self.assertEqual(crc, 0b010)
crc = crcProc.calculate2(0b11010011101111, 16, 0b011, 3) ## 0x34EF 0xB
self.assertEqual(crc, 0b001)
crc = crcProc.calculate2(0b11010011101111, 16, 0b011, 3) ## 0x34EF 0xB
self.assertEqual(crc, 0b001)
crc = crcProc.calculate2(0b11010111101111, 16, 0b011, 3) ## 0x35EF 0xB
self.assertEqual(crc, 0b111)
crc = crcProc.calculate2(0b11011011101111, 16, 0b011, 3) ## 0x36EF 0xB
self.assertEqual(crc, 0b110)
crc = crcProc.calculate2(0b11011111101111, 16, 0b011, 3) ## 0x37EF 0xB
self.assertEqual(crc, 0b000)
def test_calculate2_8rev_check(self):
## input data generated from other tests
crcProc = HwCRC()
crcProc.setReversed()
crc = crcProc.calculate2(0x000300, 24, 0x1BF, 8)
self.assertEqual(crc, 0x50) ## 80
def test_calculate2_8rev_01(self):
## input data generated from other tests
crcProc = HwCRC()
crcProc.setReversed()
crc = crcProc.calculate2(0x12, 8, 0x1BF, 8)
self.assertEqual(crc, 0x3F) ## 63