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CC2538: enough memory for connecting CC2538 to CC3100?

Part Number: CC2538
Other Parts Discussed in Thread: CC3100, Z-STACK

Greetings,

I am trying to connect CC2538 as a coordinator to CC3100 (WiFi module) through SPI. I read that this may not be accomplished since the CC3100 doesn't have a processor so it will use the CC2538's which will result in taking some of the RAM in CC2538.

So I wanted to know how much memory I need to save for the Z-stack part for CC2538 as it will be my coordinator connecting to not more than 20 nodes?

Is there a specific method for calculating how much memory needed for initialization and each extra node added?

If it doesn't fit to hold all of this, could I add some memory (ARM) to the CC2538, or it will be a hard way?

Regards
James