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.. default-domain:: cpp
.. highlight:: sh
-----------
pw_checksum
-----------
The pw_checksum module provides functions for calculating checksums.
pw_checksum/ccitt_crc16.h
=========================
.. cpp:namespace:: pw::checksum
.. cpp:var:: constexpr uint16_t kCcittCrc16DefaultInitialValue = 0xFFFF
The default initial value for the CRC16.
.. cpp:function:: 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 :cpp:expr:`0xFFFF`.
To incrementally calculate a CRC16, use the previous value as the initial
value.
.. code-block:: cpp
uint16_t crc = CcittCrc16(my_data);
crc = CcittCrc16(more_data, crc);
Compatibility
=============
* C
* C++17
Dependencies
============
* pw_span
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