On Thu, Jul 8, 2010 at 12:02 AM, Sébastien Lorquet <[email protected]> wrote: > Totally agree. Looks like your atmel is OK provided you just add a 3.57 > crystal clock. You can still make a bitbanged uart if you wish, and use an > irq as a timer.
I agree also on this. Moreover, Atmel is already used in similar project : http://www.adafruit.com/index.php?main_page=product_info&products_id=101 http://www.ladyada.net/make/simreader/index.html So, maybe this project pages will give Luisa some hints... Btw, can not the internal Atmel uC clock be divided somehow and let out via some GPIO or other pin ? Why need for external crystal ? I do not know much, just asking... > As a side note, to sample the IO line, ISO7816 requires to read the line at > the middle of the bit. You're not required to average more than one read. > Just have your irq run a twice the bitrate so that you can read the bit in > the middle, and toggle the IO line at the right moment for sending. I agree also on this - sampling one value on I/O line in the middle of the ETU should be quite sufficient. Luisa, good luck and keep us informed on your interesting project. BR, Drasko _______________________________________________ Muscle mailing list [email protected] http://lists.drizzle.com/mailman/listinfo/muscle
