Non-Volatile Memory

Read data from and write data to non-volatile memory. More...

Collaboration diagram for Non-Volatile Memory:

Modules
	AVR EEPROM
	AVR on-chip EEPROM support.
Functions
int	NutNvMemLoad (unsigned int addr, void *buff, size_t siz)
	Read data from non-volatile memory.
int	NutNvMemSave (unsigned int addr, const void *buff, size_t len)
	Save data in non-volatile memory.

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Detailed Description

Read data from and write data to non-volatile memory.

Non-volatile data memory is typically used to store configuration settings. Nut/OS currently supports three types of non-volatile storage:

• Intersil X12xx EEPROM, if NUT_CONFIG_X12RTC is defined.
• AT49BV flash sector, if NUT_CONFIG_AT49BV is defined.
• AVR on-chip EEPROM, if Nut/OS has been build for this platform if none of the macros listed above is defined.

Nut/OS uses non-volatile memory to store the _CONFOS structure at location CONFNET_EE_OFFSET and the _CONFNET structure at location CONFNET_EE_OFFSET.

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Function Documentation

int NutNvMemLoad	(	unsigned int	addr,
		void *	buff,
		size_t	siz
	)

Read data from non-volatile memory.

Load data from AVR EEPROM.

This routine provides platform independent access to non-volatile configuration data.

Parameters:

addr	Location to read from.
buff	Pointer to a buffer that receives the data.
siz	Number of bytes to read.

Returns:

0 on success, -1 otherwise.

References At45dbParamRead(), At49bvParamRead(), At91EfcParamRead(), EEInit(), EEReadData(), Lpc177x_8x_EepromRead(), Lpc17xxIapParamRead(), OnChipNvMemLoad(), SpiAt45dConfigRead(), and X12EepromRead().

Referenced by findenv(), NutLoadConfig(), and NutNetLoadConfig().

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int NutNvMemSave	(	unsigned int	addr,
		const void *	buff,
		size_t	len
	)

Save data in non-volatile memory.

Save data in AVR EEPROM.

This routine provides platform independent access to non-volatile configuration data.

Parameters:

addr	Location to write to.
buff	Pointer to a buffer that contains the data.
len	Number of bytes to write.

Returns:

0 on success, -1 otherwise.

References At45dbParamWrite(), At49bvParamWrite(), At91EfcParamWrite(), EEWriteData(), Lpc177x_8x_EepromWrite(), Lpc17xxIapParamWrite(), OnChipNvMemSave(), SpiAt45dConfigWrite(), and X12EepromWrite().

Referenced by NutNetSaveConfig(), and NutSaveConfig().

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