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AVR-DOS minimum SDRAM usage

 
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user123

Bascom Member



Joined: 06 Mar 2006
Posts: 3

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PostPosted: Mon Mar 06, 2006 7:44 pm    Post subject: AVR-DOS minimum SDRAM usage Reply with quote
I am also concerned by the out of SRAM Problem using AVR-DOS on a ATMEGA 128 Shocked

I read here that there is a minimum SRAM usage of 1200 bytes.

How can I assure that AVR DOS only uses the minimum SRAM possible?
Only 1 file open at a time? No subdirs? Short file names? FAT16/Fat32? Rolling Eyes

Project is a ATMEGA128 with a GLCD T6963C + 2 Hardware RX/TX + 5 digital I/O + 1 buzzer out + SD-Card (Kingston 256MB)

Thanks in advanve again for your help!
Confused
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oe9vfj

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Joined: 17 Jun 2004
Posts: 269
Location: Austria, Hard
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PostPosted: Tue Mar 07, 2006 8:30 pm    Post subject: Reply with quote
Hi User123,

You can configure AVR-DOS in the file CONFIG_AVR-DOS.BAS. Please check the comments in this file.

For minimal SRAM usage set following constants:

Code:
Const cFileHandles = 1                              
Const cSepFATHandle = 0      


You can use all features of AVR-DOS. The restriction of this configuration is, that you can open only one file at same time.
_________________
regards Josef

DOS - File System for BASCOM-AVR on http://members.aon.at/voegel
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user123

Bascom Member



Joined: 06 Mar 2006
Posts: 3

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PostPosted: Tue Mar 07, 2006 8:35 pm    Post subject: I HAVE SOOOOOOO much SRAM now Reply with quote
Dear Josef,

thank you so much for your help.
I have sooo much free SRAM now, I am happy happy happy.
Used to economize every 3 bytes with string lengths and now have around 1000 bytes free space, what a stone falling from my shoulders Smile Laughing
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