avr_compiler.h File Reference

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Detailed Description

Header file for compiler compatibility.

This file contains some general definitions and macros to ensure code compatibility with both IAR and GCC.

Application note:

AVR1610: Guide to IEC60730 Class B compliance with XMEGA

Documentation

For comprehensive code documentation, supported compilers, compiler settings and supported devices see readme.html

Author:

Atmel Corporation: http://www.atmel.com
Support email: avr@a.nosp@m.tmel.nosp@m..com

Copyright (C) 2012 Atmel Corporation. All rights reserved.

Definition in file avr_compiler.h.

#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>

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Macros
#define	CLASSB_EEMAP_BEGIN()
	Enable memory mapping of EEPROM, if it is not already enabled.
#define	CLASSB_EEMAP_END()
	Disable memory mapping of EEPROM, unless it was previously enabled.
#define	ENTER_CRITICAL_REGION()
#define	LEAVE_CRITICAL_REGION()   SREG = saved_sreg;

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Macro Definition Documentation

#define CLASSB_EEMAP_BEGIN

(

)

Value:

bool eemapEnabled; \
    /* Check if memory mapping of EEPROM is already enabled. */ \
    eemapEnabled = (NVM.CTRLB & NVM_EEMAPEN_bm) ? true : false; \
\
    if (!eemapEnabled) { \
        /* 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.

Definition at line 81 of file avr_compiler.h.

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

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

Note:

Use this in conjunction with CLASSB_EEMAP_BEGIN().

Definition at line 96 of file avr_compiler.h.

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 ENTER_CRITICAL_REGION

(

)

Value:

uint8_t volatile saved_sreg = SREG; \
                                cli();

This macro will protect the following code from interrupts.

Definition at line 103 of file avr_compiler.h.

#define LEAVE_CRITICAL_REGION

(

)

SREG = saved_sreg;

This macro must always be used in conjunction with ENTER_CRITICAL_REGION so that interrupts are enabled again.

Definition at line 110 of file avr_compiler.h.