EFM32 Pearl Gecko 1 Software Documentation  efm32pg1-doc-5.1.2
Data Fields
GPCRC_Init_TypeDef Struct Reference
EMLIB » GPCRC

Detailed Description

CRC initialization structure.

Definition at line 102 of file em_gpcrc.h.

#include <em_gpcrc.h>

Data Fields

bool autoInit
 
uint32_t crcPoly
 
bool enable
 
bool enableByteMode
 
uint32_t initValue
 
bool reverseBits
 
bool reverseByteOrder
 

Field Documentation

bool GPCRC_Init_TypeDef::autoInit

Enable automatic initialization by re-seeding the CRC result based on the init value after reading one of the CRC data registers

Definition at line 155 of file em_gpcrc.h.

Referenced by GPCRC_Init().

uint32_t GPCRC_Init_TypeDef::crcPoly

CRC polynomial value. The GPCRC support either a fixed 32-bit polynomial or a user configurable 16 bit polynomial. The fixed 32-bit polynomial is the one used in IEEE 802.3, which has the value 0x04C11DB7. To use the 32-bit fixed polynomial just assign 0x04C11DB7 to the crcPoly field. To use a 16-bit polynomial assign a value to crcPoly where the upper 16 bit's are zero.

The polynomial should be written in normal bit order. So for instance if you want to use the CRC-16 polynomial X^16 + X^15 + X^2 + 1 then we can first convert it to hex representation and remove the highest order term of the polynomial. This would give us 0x8005 as the value to write into crcPoly.

Definition at line 118 of file em_gpcrc.h.

Referenced by GPCRC_Init().

bool GPCRC_Init_TypeDef::enable

Enable/disable GPCRC when initialization is completed.

Definition at line 158 of file em_gpcrc.h.

Referenced by GPCRC_Init().

bool GPCRC_Init_TypeDef::enableByteMode

Enable/disable byte mode. When byte mode is enabled then all input is treated as single byte input, even though the input is a 32-bit word or a 16-bit half word. Only the least significant byte of the data-word will be used for CRC calculation for all writes.

Definition at line 149 of file em_gpcrc.h.

Referenced by GPCRC_Init().

uint32_t GPCRC_Init_TypeDef::initValue

CRC initialization value. This value is assigned to the GPCRC_INIT register. The initValue is loaded into the data register when calling the GPCRC_Start function or when one of the data registers are read while autoInit is enabled.

Definition at line 126 of file em_gpcrc.h.

Referenced by GPCRC_Init().

bool GPCRC_Init_TypeDef::reverseBits

Reverse bits within each input byte. This setting enables or disable byte level bit reversal. When byte-level bit reversal is enabled then each byte of input data will be reversed before entering the CRC calculation.

Definition at line 141 of file em_gpcrc.h.

Referenced by GPCRC_Init().

bool GPCRC_Init_TypeDef::reverseByteOrder

Reverse byte order. This has an effect when sending a 32-bit word or 16-bit half word input to the CRC calculation. When set to true the input bytes are reversed before entering the CRC calculation. When set to false the input bytes stay in the same order.

Definition at line 134 of file em_gpcrc.h.

Referenced by GPCRC_Init().

The documentation for this struct was generated from the following file: