Cyclic Redundancy Check#

halCommonCrc16#

uint16_t halCommonCrc16 (uint8_t newByte, uint16_t prevResult)

Calculates 16-bit cyclic redundancy code (CITT CRC 16).

Applies the standard CITT CRC 16 polynomial to a single byte. It should support being called first with an initial value, then repeatedly until all data is processed.

Returns

• The new CRC result.

halCommonCrc32#

uint32_t halCommonCrc32 (uint8_t newByte, uint32_t prevResult)

Calculates 32-bit cyclic redundancy code.

Note

• On some radios or micros, the CRC for error detection on packet data is calculated in hardware.

Applies a CRC32 polynomial to a single byte. It should support being called first with an initial value, then repeatedly until all data is processed.

Returns

• The new CRC result.

INITIAL_CRC#

#define INITIAL_CRC

0xFFFFFFFFL

initial crc

CRC32_START#

#define CRC32_START

INITIAL_CRC

crc32 start

CRC32_END#

#define CRC32_END

0xDEBB20E3L

For CRC32 POLYNOMIAL run LSB-MSB.