def test_convert_to_lsb_list(self):
bytes_list = convert_to_lsb_list(0x04030201, 4)
self.assertEqual(len(bytes_list), 4)
self.assertEqual(bytes_list[0], 0x80) ## 0b 1000 0000
self.assertEqual(bytes_list[1], 0x40) ## 0b 0100 0000
self.assertEqual(bytes_list[2], 0xC0) ## 0b 1100 0000
self.assertEqual(bytes_list[3], 0x20) ## 0b 0010 0000
def test_hw_crc8_calculate_3_reverse(self):
data = 0x000300
dataSize = 24
poly = 0x1BF
poly = reverse_number(poly, 8)
bytes_list = convert_to_lsb_list(data, dataSize / 8)
calc_crc = hw_crc8_calculate(bytes_list, poly, 0x00, 0x00)
calc_crc = reverse_number(calc_crc, 8)
self.assertEqual(calc_crc, 0x50) ## 80
def test_hw_crc8_calculate_1_reverse(self):
data = 0x12
dataSize = 8
poly = 0xBF
poly = reverse_number(poly, 8)
bytes_list = convert_to_lsb_list(data, dataSize / 8)
calc_crc = hw_crc8_calculate(bytes_list, poly, 0x00, 0x00)
calc_crc = reverse_number(calc_crc, 8)
self.assertEqual(calc_crc, 0x3F) ## 63
def calculateLSB(self, dataMask, polyMask):
# return self.calculateLSBClassic(dataMask, polyMask)
if dataMask.dataSize % 8 != 0:
## fast crc only supports full bytes
return self.calculateLSBClassic(dataMask, polyMask)
bytesList = convert_to_lsb_list(dataMask.dataNum,
dataMask.dataSize / 8)
poly = reverse_number(polyMask.dataNum, polyMask.dataSize)
initReg = reverse_number(self.registerInit, polyMask.dataSize)
xor_val = reverse_number(self.xorOut, polyMask.dataSize)
calc_crc = hw_crc8_calculate(bytesList, poly, initReg, xor_val)
return reverse_number(calc_crc, polyMask.dataSize)
