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SRAM space left

 
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jeremywilson

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Joined: 11 Jul 2011
Posts: 61
Location: United States

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PostPosted: Thu Feb 18, 2021 8:55 pm    Post subject: SRAM space left Reply with quote

I noticed something strange (or I don't understand) about the SRAM "space left" in the report:

I'm using ATMega2560 with 8K of internal SRAM.

from report:
Stack start : 21FF hex
Stack size : 80 hex (128)
S-Stacksize : 80 hex (128)
S-Stackstart : 2180 hex
Framesize : CE4 hex (3300)
Framestart : 141C hex
Space left : 563 dec

last variable is at 11E4 hex (4580)

Shouldn't space left be: 8192 - Stack size - S_stacksize - Framesize - last_var = 8192 - 128 - 128 -3300 - 4580 = 56 ?

Am I missing something in my equation?

Thanks !!

(BASCOM-AVR version : 2.0.8.3 , Latest : 2.0.8.3 )
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laborratte

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Joined: 27 Jul 2005
Posts: 276
Location: Berlin

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PostPosted: Thu Feb 18, 2021 10:21 pm    Post subject: Reply with quote

First var is at 200 hex.
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jeremywilson

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Joined: 11 Jul 2011
Posts: 61
Location: United States

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PostPosted: Thu Feb 18, 2021 11:10 pm    Post subject: Reply with quote

I figured it had to do with the 200 offset, but I see many variables with lower addresses. I guess those are all register variables.

Thanks for the response!
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MWS

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Joined: 22 Aug 2009
Posts: 1905

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PostPosted: Fri Feb 19, 2021 8:27 am    Post subject: Reply with quote

jeremywilson wrote:
I guess those are all register variables.

Which is called I/O.
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