5100 ethernet and Due

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i trying compile working-on-a-mega project new due using ide 1.5.6r2 - , have got stuck on problem w5100.h :

   w5100.h:339: error: 'ddrb' not declared in scope

(and _bv,  , portb)

this seems fundamental problem, sure has simple answer. people report managing make 5100-based ethernet shields work due, can't find details of adaptations needed. have found mention of ethernet52due.h - sounds if has been written newer w5200 chip.

ideas, please.

all definitions (ddrb, portb etc) avr-specific, not work on due. more can't because i've not used libs.

btw, why 2 posts?

______
rob


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