CRC Defines

libopencm3 Defined Constants and Types for the STM32F7xx CRC Generator More...

Collaboration diagram for CRC Defines:

Modules
	CRC Registers
	CRC_CR values

Macros
#define	CRC_POL_DEFAULT   0x04C11DB7
	Default polynomial. More...

Functions
void	crc_reset (void)
	Reset the CRC calculator to initial values. More...
uint32_t	crc_calculate (uint32_t data)
	Writes a data word to the register, the write operation stalling until the computation is complete. More...
uint32_t	crc_calculate_block (uint32_t *datap, int size)
	Add a block of data to the CRC calculator and return the final result. More...
void	crc_reverse_output_enable (void)
	Enable reverse output data. More...
void	crc_reverse_output_disable (void)
	Disable reverse output data. More...
void	crc_set_reverse_input (uint32_t reverse_in)
	Reverse input data. More...
void	crc_set_polysize (uint32_t polysize)
	Polynomial size. More...
void	crc_set_polynomial (uint32_t polynomial)
	Polynomial coefficient. More...
void	crc_set_initial (uint32_t initial)
	CRC Initial value. More...

Detailed Description

libopencm3 Defined Constants and Types for the STM32F7xx CRC Generator

Version

1.0.0

Date

11 Apr 2019

LGPL License Terms libopencm3 License

Author

© 2010 Thomas Otto tommi.nosp@m.@via.nosp@m.dmin..nosp@m.org

© 2016 Cem Basoglu cem.b.nosp@m.asog.nosp@m.lu@we.nosp@m.b.de

Macro Definition Documentation

CRC_POL_DEFAULT

#define CRC_POL_DEFAULT   0x04C11DB7

Default polynomial.

Definition at line 90 of file crc_v2.h.

Function Documentation

crc_calculate()

uint32_t crc_calculate

(

uint32_t

data

)

Writes a data word to the register, the write operation stalling until the computation is complete.

Parameters

[in]

data

new word to add to the CRC calculator

Returns

int32 Computed CRC result

Definition at line 36 of file crc_common_all.c.

References CRC_DR.

crc_calculate_block()

uint32_t crc_calculate_block	(	uint32_t *	datap,
		int	size
	)

Add a block of data to the CRC calculator and return the final result.

Writes data words consecutively to the register, the write operation stalling until the computation of each word is complete, then returns the final result

Parameters

[in]	datap	pointer to an array of 32 bit data words.
[in]	size	length of data, in 32bit increments

Returns

final CRC calculator value

Definition at line 43 of file crc_common_all.c.

References CRC_DR.

crc_reset()

void crc_reset

(

void

)

Reset the CRC calculator to initial values.

Definition at line 31 of file crc_common_all.c.

References CRC_CR, and CRC_CR_RESET.

crc_reverse_output_disable()

void crc_reverse_output_disable

(

void

)

Disable reverse output data.

Disables the reversal of the bit order of the output data.

Definition at line 49 of file crc_v2.c.

References CRC_CR.

crc_reverse_output_enable()

void crc_reverse_output_enable

(

void

)

Enable reverse output data.

Enables the reversal of the bit order of the output data.

Definition at line 38 of file crc_v2.c.

References CRC_CR, and CRC_CR_REV_OUT.

crc_set_initial()

void crc_set_initial

(

uint32_t

initial

)

CRC Initial value.

Sets the crc initial value.

Parameters

[in]

initial

Unsigned int32. CRC initial value.

Definition at line 110 of file crc_v2.c.

References CRC_INIT.

crc_set_polynomial()

void crc_set_polynomial

(

uint32_t

polynomial

)

Polynomial coefficient.

Set the coefficients of the polynomial to be used for CRC calculation. If the polynomial size is less than 32-bits, the least significant bits have to be used to program the correct value.

Note

To obtain a reliable CRC calculation, any changes to the polynomial value or size can not be performed during a CRC calculation. As a result, if a CRC calculation is ongoing, the application must either reset the crc unit it or perform a CRC_DR read before changing the polynomial.

The default polynomial value is the CRC-32 (Ethernet) polynomial: 0x4C11DB7.

Parameters

[in]

polynomial

Unsigned int32. Polynomial coefficient.

Definition at line 98 of file crc_v2.c.

References CRC_POL.

crc_set_polysize()

void crc_set_polysize

(

uint32_t

polysize

)

Polynomial size.

Set the size of the polynomial.

Parameters

[in]

polysize

Unsigned int32. Size of polynomial CRC Polynomial size.

Definition at line 75 of file crc_v2.c.

References CRC_CR.

crc_set_reverse_input()

void crc_set_reverse_input

(

uint32_t

reverse_in

)

Reverse input data.

Controls the reversal of the bit order of the input data

Parameters

[in]

reverse_in

Unsigned int32. Reversal bit order CRC Reverse input options.

Definition at line 61 of file crc_v2.c.

References CRC_CR.