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dexter zero-kelvin at gmx.deHi folks. I have now getting interrupts and i am sending the first little APDUs to the card. I think i will have something that basicly works soon. But up to now i think it will be impossible to save processing time during the transmission - wait phases without having semaphores (or something semilar that can be used to wait for an event without wasting processing time in a while loop.) However - this only makes sense with a multitasking os which we actually do not have ;-) The driver will get a function like sim_card_transceive(*message, *response) or so on because a transaction with the card will never be receive or send only. You always send something to the card and you always get something back. The response and answer apdu structures will be the same as in XCOS and i think i can reuse a lot of the good old XCOS header files that contain basic constants, returncodes ect... Thanks a lot to roh who showed me how i can register an interrupt. regards. Philipp