carrot/panda/python/utils.py
Vehicle Researcher eff388b1b6 openpilot v0.9.4 release
date: 2023-07-27T18:38:32
master commit: fa310d9e2542cf497d92f007baec8fd751ffa99c
2023-09-27 15:45:31 -07:00

13 lines
321 B
Python

def crc8_pedal(data):
crc = 0xFF # standard init value
poly = 0xD5 # standard crc8: x8+x7+x6+x4+x2+1
size = len(data)
for i in range(size - 1, -1, -1):
crc ^= data[i]
for _ in range(8):
if ((crc & 0x80) != 0):
crc = ((crc << 1) ^ poly) & 0xFF
else:
crc <<= 1
return crc