Re: [avr-gcc-list] Extended SRAM help

[Kang Tin LAI]

Hi,

Change line in avr85xx.x:
  data   (rw!x) : ORIGIN = 0x800060, LENGTH = 512
to:
  data   (rw!x) : ORIGIN = 0x800060, LENGTH = 8K

My linker flags:
LDFLAGS = -Map address@hidden -Tavr85xx.x \
                --defsym __init_mcucr__=0xc0 \
                --defsym __init_wdtcr__=0x00 --defsym __stack=0x7fff

I put modified avr85xx.x in my project directory, set linker option -T
to tell the
linker uses this script. __init_mcucr__ I set to 0xc0 which enables sram
and 1
wait state. __init_wdtcr__ this setting disables the watchdog. I put the
stack
to top of the sram.

Hope help.

Kang

Louis Jewett wrote:
> 
> I'm new to programming on the AVR and need a hand. I have a 8515 and am
> programming it via avrgcc on the stk200.  After reading through the archives
> and several web sites I have the compiler setup and am able to flash
> programs to the chip.  Now I have a need to use the 32k SRAM I have added to
> the stk200, but am having trouble. In a previous post I found that I needed
> to update the avr85xx.x file to reflect the new ammount of memory, and link
> it with my program.  It also metioned setting the SRE bit in the MCU to
> enable the extra ram?  This I have no clue on how to do.  I'm useing the
> avrgcc7 example from avr for dummies ( Uart access to a computer terminal )
> so if anyone has some example code that will print to terminal the response
> of a value stored in memory higher than 512 PLEASE tell me how!!  Thanks
> very much..
> 
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