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SPI: send bootstub status in version request (#1492)

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* mv first

* switch to crc8

* bootstub

* test

* cleanup

* little more

* misra

---------

Co-authored-by: Comma Device <device@comma.ai>
This commit is contained in:
Adeeb Shihadeh
2023-07-03 15:23:12 -07:00
committed by GitHub
parent d693e89df2
commit 14fd5ff5a3
5 changed files with 87 additions and 54 deletions
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12
python/utils.py Normal file
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@@ -0,0 +1,12 @@
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