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AP_Math: add crc_sum_of_bytes 

sums the values of the bytes in a buffer and returns that sum modulus 256
This commit is contained in:
Peter Barker 2023-06-27 00:02:15 +10:00 committed by Andrew Tridgell
parent 32f6c1c53f
commit 3f730a8a94
2 changed files with 15 additions and 0 deletions
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11
libraries/AP_Math/crc.cpp
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@ -598,3 +598,14 @@ uint8_t parity(uint8_t byte)
return p;
}
// sums the bytes in the supplied buffer, returns that sum mod 256
// (i.e. shoved into a uint8_t)
uint8_t crc_sum_of_bytes(uint8_t *data, uint16_t count)
{
uint8_t ret = 0;
for (uint32_t i=0; i<count; i++) {
ret += data[i];
}
return ret;
}

4
libraries/AP_Math/crc.h
View File

@ -61,3 +61,7 @@ uint64_t crc_crc64(const uint32_t *data, uint16_t num_words);
// return the parity of byte - "1" if there is an odd number of bits
// set, "0" if there is an even number of bits set
uint8_t parity(uint8_t byte);
// sums the bytes in the supplied buffer, returns that sum mod 256
// (i.e. shoved into a uint8_t)
uint8_t crc_sum_of_bytes(uint8_t *data, uint16_t count);