Hi Sebastien, On 7/7/10, Sébastien Lorquet <[email protected]> wrote: >> Looks very good. > >> > If I were you, I would use a GPIO to detect card insertion. This event >> can >> > be used to trigger card activation, reset sequence, ATR reading and >> optional >> > PPS exchange. Do you plan to connect your reader to a PC via a serial >> port? >> > TxD and RxD are still free on PD0 and PD1. >> > >> >> Thanks, am, there is another hardware usart bellow it, and yes, my >> intention is to connect the reader to the computer. >> >> However, given your and drasko's clarifying comments, I'm feeling a >> bit like this is not the chip I want to use anymore? I mean, I'm gonna >> study the whole thing at hardware level, and study whether this chip >> will leave me room for getting anywhere I ever wanted to in terms of >> the iso implementation/smartcard development. >> >> If it doesn't, I have some ST7XX samples arround (arm7 chips from >> st-microelectronics), an (iirc) believe one of them has builtin >> smartcard support, including clock frecuency switching at runtime. >> >> My main concern is really to have a processor powerfull enough so as >> let me do it by software. It's more fun to me achieve a software >> implementation that I made, than reading the ds and setting a few >> registers with a given recommended hardware-setup beneath, though >> having that on-chip is an advantage also, I could use it when I wanted >> to. >> >> 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. > > an ARM SoC looks a bit overkill for this task, a 8 bit micro is enough for > this task. it will be funnier, easier to understand and easier to reproduce. > > 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. > >
Yes, it definetely looks like this is going to be hable to handle it, at least t=0. > >> Well, thanks, I'l keep you informed guys! >> >> Hope so! This project is interesting! > Thanks, I will. > Regards > seb > _______________________________________________ Muscle mailing list [email protected] http://lists.drizzle.com/mailman/listinfo/muscle
