Hi List, Here are some bare-minimum code contributions for iso7816-3 slave side protocol. https://github.com/zwizwa/at91work/tree/apdu_phone git@github.com:zwizwa/at91work.git branch apdu_phone Relevant files are in: iso7816-slave-cdc-project/ src/ I spent a bit more time on this than expected on low-level platform stuff, leaving me with no time to smooth the rough edges at the PC interface side. It's a start, though. Features: - non-blocking iso7816-3 state machine for slave-side protocol (reusable in COS?) - low-level AT91 USART is abstracted as iso7816_port.h - line-oriented ASCII HEX protocol over CDC USB serial, easy to use in (python) scripts - transport is separate from state machine, easy to replace with other discussed mechanisms - works for me on Nexus One and BLU SAMBA JR plus Non-features: - hardcoded ATR - hardcoded power cycle skipping to select correct operating voltage - not using SIMtrace SIM slot (see mim.py for using a PC card reader to complete MITM) - did not test with DFU but should work (I used Atmel SAM-ICE) - standalone firmware, not integrated with CCID / sniffer - git history is messy. i'd just flatten it for further work