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Re: [avr-gcc-list] Re: an idea: adding serial sram to avr to extend heap

From: Raymond Moore
Subject: Re: [avr-gcc-list] Re: an idea: adding serial sram to avr to extend heap storage
Date: Sun, 13 Mar 2011 20:08:57 -0500


We have worked with that option for many projects already.  Again, to
get the program space needed for some of the projects we need to go
with a surface mount chip such as the atmega128.  Currently our chip
of choice is the atmega1284p which gives us plenty of both flash and
sram in a 40pin dip package.  As for specific requirements, there are
none yet.  This whole idea is just that, an idea, that started
percolating around in my head as I was reading through the python on a
chip project today and I thought this would be a good place to get
some hints on how feasible it might be and/or where to start digging
to work on it myself.


On Sun, Mar 13, 2011 at 7:57 PM,  <address@hidden> wrote:
> Is there a specific requirement for it to be a *serial* SRAM? You can easily 
> tie a 32k parallel SRAM to the external memory bus of many atmega devices 
> with just a bus latch ('373 or '573) and a single inverter. This xram is 
> trivially mappable to the heap and/or bss space using linker directives (or 
> linker scripts).
> Cheers,
> --
> Matt van de Werken
> Electronics Engineer
> Mining Geoscience, CSIRO Earth Science and Resource Engineering
> 1 Technology Ct   Pullenvale   QLD   4069
> P: 07 3327 4142  F: 07 3327 4455  M: 0400 538 608
> E: address@hidden
> "Those that do not understand UNIX are condemned to reinvent it, poorly"
>  - Henry Spencer

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