SAM DMA cyclic redundancy check (CRC) Driver.

#include <compiler.h>

Data Structures
struct	dma_crc_config
	Configurations for CRC calculation. More...

Macros
#define	DMA_CRC_CHANNEL_N_OFFSET 0x20
	DMA channel n offset. More...

Enumerations
enum	crc_beat_size { CRC_BEAT_SIZE_BYTE, CRC_BEAT_SIZE_HWORD, CRC_BEAT_SIZE_WORD }
	CRC Beat Type. More...

enum	crc_polynomial_type { CRC_TYPE_16, CRC_TYPE_32 }
	CRC Polynomial Type. More...

Functions
static enum status_code	dma_crc_channel_enable (uint32_t channel_id, struct dma_crc_config *config)
	Enable DMA CRC module with an DMA channel. More...

static void	dma_crc_disable (void)
	Disable DMA CRC module. More...

static uint32_t	dma_crc_get_checksum (void)
	Get DMA CRC checksum value. More...

static void	dma_crc_get_config_defaults (struct dma_crc_config *config)
	Get DMA CRC default configurations. More...

static void	dma_crc_io_calculation (void *buffer, uint32_t total_beat_size)
	Calculate CRC with I/O. More...

static enum status_code	dma_crc_io_enable (struct dma_crc_config *config)
	Enable DMA CRC module with I/O. More...

#define DMA_CRC_CHANNEL_N_OFFSET 0x20

DMA channel n offset.

Referenced by dma_crc_channel_enable().

enum crc_beat_size

CRC Beat Type.

Enumerator
CRC_BEAT_SIZE_BYTE	Byte bus access.
CRC_BEAT_SIZE_HWORD	Half-word bus access.
CRC_BEAT_SIZE_WORD	Word bus access.

enum crc_polynomial_type

CRC Polynomial Type.

Enumerator
CRC_TYPE_16	CRC16 (CRC-CCITT).
CRC_TYPE_32	CRC32 (IEEE 802.3).

static enum status_code dma_crc_channel_enable	(	uint32_t	channel_id,
		struct dma_crc_config *	config
	)

inlinestatic

Enable DMA CRC module with an DMA channel.

This function enables a CRC calculation with an allocated DMA channel. This channel ID can be gotten from a successful dma_allocate.

Parameters

[in]	channel_id	DMA channel expected with CRC calculation
[in]	config	CRC calculation configurations

Returns: Status of the DMC CRC.

Return values

STATUS_OK	Get the DMA CRC module
STATUS_BUSY	DMA CRC module is already taken and not ready yet

References DMA_CRC_CHANNEL_N_OFFSET, dma_crc_config::size, STATUS_BUSY, STATUS_OK, and dma_crc_config::type.

static void dma_crc_disable ( void )

inlinestatic

Disable DMA CRC module.

Referenced by generate_crc().

static uint32_t dma_crc_get_checksum ( void )

inlinestatic

Get DMA CRC checksum value.

Returns: Calculated CRC checksum.

Referenced by generate_crc().

static void dma_crc_get_config_defaults ( struct dma_crc_config * config )

inlinestatic

Get DMA CRC default configurations.

The default configuration is as follows:

Polynomial type is set to CRC-16(CRC-CCITT)
CRC Beat size: BYTE

Parameters

[in] config default configurations

References Assert, CRC_BEAT_SIZE_BYTE, CRC_TYPE_16, dma_crc_config::size, and dma_crc_config::type.

Referenced by generate_crc().

static void dma_crc_io_calculation	(	void *	buffer,
		uint32_t	total_beat_size
	)

inlinestatic

Calculate CRC with I/O.

This function calculate the CRC of the input data buffer.

Parameters

[in]	buffer	CRC Pointer to calculation buffer
[in]	total_beat_size	Total beat size to be calculated

Returns: Calculated CRC checksum value.

References buffer, counter, CRC_BEAT_SIZE_BYTE, CRC_BEAT_SIZE_HWORD, CRC_BEAT_SIZE_WORD, and nop.

Referenced by generate_crc().

static enum status_code dma_crc_io_enable ( struct dma_crc_config * config )

inlinestatic

Enable DMA CRC module with I/O.

This function enables a CRC calculation with I/O mode.

Parameters

[in] config CRC calculation configurations.

Returns: Status of the DMC CRC.

Return values

STATUS_OK	Get the DMA CRC module
STATUS_BUSY	DMA CRC module is already taken and not ready yet

References CRC_TYPE_32, dma_crc_config::size, STATUS_BUSY, STATUS_OK, and dma_crc_config::type.

Referenced by generate_crc().

Microchip® Advanced Software Framework

Data Structures

Macros

Enumerations

Functions