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Forum: ARM programming with GCC/GNU tools AT91SAM7S256 data in EEPROM


Author: Marcin Domaszewicz (marcind)
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Hi,

It is possible to save date, which user insert by USART, in EEPROM in 
order to it will be save even if microcontroller is off. If yes I will 
be graceful for a sample code in C which show how to do it.

Thanks in Advance.

Author: Martin Thomas (mthomas) (Moderator)
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Marcin Domaszewicz wrote:
> Hi,
>
> It is possible to save date, which user insert by USART, in EEPROM in
> order to it will be save even if microcontroller is off.

Yes,

> If yes I will
> be graceful for a sample code in C which show how to do it.

Since a AT91SAM7S does not offer an internal Eeproms there is no general 
"sample code in C" for this. Most external EEproms either offer an SPI 
or TWI interface. Look into the Atmel AT91 software-package for examples 
on using SPI and I2C/TWI. The EEprom's datasheet includes the commands 
and timing-diagrams.

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