classb_crc.h File Reference

Settings and defines used in connection with CRC memory tests.

Application note:

AVR1610: Guide to IEC60730 Class B compliance with XMEGA

Copyright (c) 2011-2018 Microchip Technology Inc. and its subsidiaries.

#include <asf.h>
#include "error_handler.h"
#include "classb_crc_hw.h"
#include "classb_crc_sw.h"

Macros
#define	CLASSB_CRC_16_BIT
	Compile 16-bit CRC functions. More...
#define	CLASSB_CRC_32_BIT
	Compile 32-bit CRC functions. More...
#define	CLASSB_CRC_USE_HW
	Compile hardware implementation. More...
#define	CLASSB_CRC_USE_SW
	Compile software implementation. More...
#define	CRC16_INITIAL_REMAINDER   (uint16_t)0x0000
	Initial remainder for the 16-bit CRC. More...
#define	CRC32_INITIAL_REMAINDER   (uint32_t)0xFFFFFFFF
	Initial remainder for the 32-bit CRC. More...
EEPROM Mapping defines
#define	CLASSB_EEMAP_BEGIN()
	Enable memory mapping of EEPROM, if it is not already enabled. More...
#define	CLASSB_EEMAP_END()
	Disable memory mapping of EEPROM, unless it was previously enabled. More...

Typedefs
typedef uint32_t	crcbytenum_t
	Data type to use for byte counts in CRC computations. More...
Pointer types for CRC functions
These are needed for IAR and GCC compatibility.
typedef const void *	eepromptr_t
	Generic pointer to EEPROM. More...
typedef const uint8_t *	eeprom_uint8ptr_t
	Pointer to a byte in EEPROM. More...
typedef const uint16_t *	eeprom_uint16ptr_t
	Pointer to two bytes in EEPROM. More...
typedef const uint32_t *	eeprom_uint32ptr_t
	Pointer to four bytes in EEPROM. More...
typedef flash_addr_t	flashptr_t
	Generic pointer to Flash. More...
typedef flash_addr_t	flash_uint8ptr_t
	Pointer to a byte in Flash. More...

#define CLASSB_EEMAP_BEGIN

(

)

Value:

bool eemap_is_enabled;                                                 \
    /* Check if memory mapping of EEPROM is already enabled. */            \
    eemap_is_enabled = (NVM.CTRLB & NVM_EEMAPEN_bm) ? true : false;        \
	                                                                       \
	if (!eemap_is_enabled) {                                               \
        /* Ensure that NVM is ready before enabling memory mapping. */ \
        do {                                                           \
        } while (NVM.STATUS & NVM_NVMBUSY_bm);                         \
        NVM.CTRLB |= NVM_EEMAPEN_bm;                                   \
    }

Enable memory mapping of EEPROM, if it is not already enabled.

Note

Use this in conjunction with CLASSB_EEMAP_END() to ensure that the prior configuration of memory-mapping is preserved.

Referenced by CLASSB_CRC16_EEPROM_HW(), CLASSB_CRC16_EEPROM_SW(), CLASSB_CRC16_Flash_HW(), CLASSB_CRC16_Flash_SW(), CLASSB_CRC32_EEPROM_HW(), CLASSB_CRC32_EEPROM_SW(), CLASSB_CRC32_Flash_HW(), and CLASSB_CRC32_Flash_SW().

#define CLASSB_EEMAP_END

(

)

Value:

if (!eemap_is_enabled) {                                               \
        NVM.CTRLB &= ~NVM_EEMAPEN_bm;                                  \
    }

Disable memory mapping of EEPROM, unless it was previously enabled.

Note

Use this in conjunction with CLASSB_EEMAP_BEGIN().

Referenced by CLASSB_CRC16_EEPROM_HW(), CLASSB_CRC16_EEPROM_SW(), CLASSB_CRC16_Flash_HW(), CLASSB_CRC16_Flash_SW(), CLASSB_CRC32_EEPROM_HW(), CLASSB_CRC32_EEPROM_SW(), CLASSB_CRC32_Flash_HW(), and CLASSB_CRC32_Flash_SW().