pw_checksum¶
The pw_checksum
module provides functions for calculating checksums.
pw_checksum/crc16_ccitt.h¶
-
constexpr uint16_t
kCcittCrc16DefaultInitialValue
= 0xFFFF¶ The default initial value for the CRC16.
-
uint16_t
CcittCrc16
(span<const std::byte> data, uint16_t initial_value = kCcittCrc16DefaultInitialValue)¶ Calculates the CRC16 of the provided data using polynomial 0x1021, with a default initial value of
0xFFFF
.To incrementally calculate a CRC16, use the previous value as the initial value.
uint16_t crc = CcittCrc16(my_data); crc = CcittCrc16(more_data, crc);
pw_checksum/crc32.h¶
-
constexpr uint32_t
kCrc32InitialValue
= 0xFFFFFFFF¶ The initial value for the CRC32.
-
uint32_t
Crc32
(span<const std::byte> data)¶ Calculates the initial / one-time CRC32 of the provided data using polynomial 0x4C11DB7, with an initial value of
0xFFFFFFFF
.uint32_t crc = Crc32(my_data);
-
uint32_t
Crc32
(span<const std::byte> data, uint32_t previous_result)¶ Incrementally append calculation of a CRC32, need to pass in the previous result.
uint32_t crc = Crc32(my_data); crc = Crc32(more_data, crc);
Compatibility¶
C
C++17
Dependencies¶
pw_span