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dad5858 Chrysler: add brakepress cancellation (#451) db94a5b Added Nissan safety (#244) d7f1195 Chrysler Checksum/counter (#450) 96e535e abstract crc function (#448) 1b49d3e Hyundai: add gas disengage and tests (#447) 598074c Volkswagen safety updates: Phase 2 (#445) b2ffaae Chrysler: disengage on gas press (#442) 2ebbe36 Subaru: disengage on gas press (#446) ccf75c4 Volkswagen safety updates: Phase 1 (#444) git-subtree-dir: panda git-subtree-split: dad5858
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Vehicle Researcher
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Feb 27, 2020
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,16 @@ | ||
uint8_t crc_checksum(uint8_t *dat, int len, const uint8_t poly) { | ||
uint8_t crc = 0xFF; | ||
int i, j; | ||
for (i = len - 1; i >= 0; i--) { | ||
crc ^= dat[i]; | ||
for (j = 0; j < 8; j++) { | ||
if ((crc & 0x80U) != 0U) { | ||
crc = (uint8_t)((crc << 1) ^ poly); | ||
} | ||
else { | ||
crc <<= 1; | ||
} | ||
} | ||
} | ||
return crc; | ||
} |
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