See Cyclic Redundancy Code (CRC) for detailed documentation.
License#
Copyright 2018 Silicon Laboratories Inc. www.silabs.com
The licensor of this software is Silicon Laboratories Inc. Your use of this software is governed by the terms of Silicon Labs Master Software License Agreement (MSLA) available at www.silabs.com/about-us/legal/master-software-license-agreement. This software is distributed to you in Source Code format and is governed by the sections of the MSLA applicable to Source Code.
/***************************************************************************/
#ifndef __CRC_H__
#define __CRC_H__
/***************************************************************************/
uint16_t halCommonCrc16(uint8_t newByte, uint16_t prevResult);
uint32_t halCommonCrc32(uint8_t newByte, uint32_t prevResult);
// Commonly used initial and expected final CRC32 values
#define INITIAL_CRC 0xFFFFFFFFL
#define CRC32_START INITIAL_CRC
#define CRC32_END 0xDEBB20E3L
#endif //__CRC_H__
Macros#
initial crc
crc32 start
For CRC32 POLYNOMIAL run LSB-MSB.
Functions#
Calculates 16-bit cyclic redundancy code (CITT CRC 16).
Calculates 32-bit cyclic redundancy code.
Function Documentation#
halCommonCrc16#
uint16_t halCommonCrc16 (uint8_t newByte, uint16_t prevResult)
Calculates 16-bit cyclic redundancy code (CITT CRC 16).
| Type | Direction | Argument Name | Description |
|---|---|---|---|
| uint8_t | N/A | newByte | The new byte to be run through CRC. |
| uint16_t | N/A | prevResult | The previous CRC result. |
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.
| Type | Direction | Argument Name | Description |
|---|---|---|---|
| uint8_t | N/A | newByte | The new byte to be run through CRC. |
| uint32_t | N/A | prevResult | The previous CRC result. |
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.