Cyclic Redundancy Code (CRC)
Hardware Abstraction Layer (HAL) API Reference > HAL Utilities

Functions that provide access to cyclic redundancy code (CRC) calculation. See crc.h for source code.

Macros

#define INITIAL_CRC 0xFFFFFFFFL
#define CRC32_START INITIAL_CRC
#define CRC32_END 0xDEBB20E3L

Functions

uint16_t halCommonCrc16 (uint8_t newByte, uint16_t prevResult)
Calculates 16-bit cyclic redundancy code (CITT CRC 16).
uint32_t halCommonCrc32 (uint8_t newByte, uint32_t prevResult)
Calculates 32-bit cyclic redundancy code.

Detailed Description

Functions that provide access to cyclic redundancy code (CRC) calculation. See crc.h for source code.

Macro Definition Documentation

#define CRC32_END   0xDEBB20E3L
#define CRC32_START INITIAL_CRC
#define INITIAL_CRC   0xFFFFFFFFL

Function Documentation

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.

Parameters
newByte The new byte to be run through CRC.
prevResult The previous CRC result.
Returns
The new CRC result.
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.

Parameters
newByte The new byte to be run through CRC.
prevResult The previous CRC result.
Returns
The new CRC result.