Re: [avr-chat] (no subject)

[Royce Pereira]

Hi,
----- Original Message ----- 
From: "Dharmesh Joshi" <address@hidden>
To: <address@hidden>
Sent: Thursday, 29 November, 2007 3:21 AM
Subject: [avr-chat] (no subject)



Dear Sir/Madam

> I am very new at the micro controller AVR, I have placed an order for my 
> starter kit. I have got few questions that I would like to ask.

1) In C when i make a array, as temporary memory, will the microchip 
automatically see that as the RAM or do I need to type some special code. 
And if so, the if I want to save whets in my array, do I just write to my 
EEPROM or Flash.

If  you dont specify storage, the default is SRAM. For eeprom/ flash , it 
depends on your compiler. AVR-GCC uses macros to access eeprom/flash. 
Commercial compilers(codevision etc) allow you to specify storage as 
eeprom/flash, & generate the code automatically. Consult your compiler's 
documentation/help.

> 2) C program has functions that can determine how much memory is the RAM. 
> Can these functions be used in the microchip, so if there is less memory my 
> chip can save other data to the EEPROM to free up space in the limited RAM.

eeprom is used for data you want to presereve during power-off. Using it as 
scratchpad during run-time, will affect performance of the code, as eeprom 
access is slow.
The amount of memory is determined by the chip you passto the compiler, 
rather than the C program.

If you are short of sram, better use another AVR device :)

regards,

--Royce.



--------------------------------------------------------------------------------


> _______________________________________________
> AVR-chat mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/avr-chat