GPCRC_Init_TypeDef Struct Reference
CRC initialization structure.
#include <em_gpcrc.h>
Data Fields |
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| uint32_t | crcPoly |
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CRC polynomial value.
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| uint32_t | initValue |
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CRC initialization value.
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| bool | reverseByteOrder |
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Reverse byte order.
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| bool | reverseBits |
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Reverse bits within each input byte.
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| bool | enableByteMode |
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Enable/disable byte mode.
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| bool | autoInit |
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Enable automatic initialization by re-seeding the CRC result based on the init value after reading one of the CRC data registers.
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| bool | enable |
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Enable/disable GPCRC when initialization is completed.
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CRC initialization structure.
Field Documentation
◆ crcPoly
| uint32_t GPCRC_Init_TypeDef::crcPoly |
CRC polynomial value.
GPCRC supports 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 bits are zero.
The polynomial should be written in normal bit order. For instance, to use the CRC-16 polynomial X^16 + X^15 + X^2 + 1, 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.
◆ initValue
| 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.