UART receive ISR receives 1st 2 bytes twice

"galapogos" <goister@gmail.com> wrote in message
news:1162398447.330815.40370@m73g2000cwd.googlegroups.com...
> Well, actually I'm using a ghetto smart card reader. Basically I took a
> usb smart card reader, ripped out the pcb, desoldered the wires, and
> soldered on my own connnection to my own dev board.
>
> I don't recall any "card-loaded" contact on the iso7816-3 specs.

That's because the ISO7816-10 (not -3) specifies the signals on the card.
How you physically connect to the card is beyond the spec. The "card-loaded"
or whatever name is used, is a signal from a switch or opto thingy on a card
reader assembly and is surely part of your ghetto reader as well.

Meindert

"galapogos" <goister@gmail.com> wrote in message
news:1162398707.853745.162010@i42g2000cwa.googlegroups.com...
> Oh and I forgot to mention, I'm using a smart card module in sim form
> factor and taping it onto the contact points on the pcb's sim holder,
> so there's no "card bounce" per se. The bounce is probably happening on
> the connector side, which is some generic connector/pin that I soldered
> onto both the smart card side and my dev board side.

Ah, sim card holders generally do not have a "card-loader" signal. I was
talking about the things where you slide in a creditcard-size smartcard.
Generally, sim card holders are not meant for regular insertion/extraction
and surely not when powered.

Meindert

Meindert Sprang wrote:
> "galapogos" <goister@gmail.com> wrote in message
> news:1162398447.330815.40370@m73g2000cwd.googlegroups.com...
> > Well, actually I'm using a ghetto smart card reader. Basically I took a
> > usb smart card reader, ripped out the pcb, desoldered the wires, and
> > soldered on my own connnection to my own dev board.
> >
> > I don't recall any "card-loaded" contact on the iso7816-3 specs.
>
> That's because the ISO7816-10 (not -3) specifies the signals on the card.
> How you physically connect to the card is beyond the spec. The "card-loaded"
> or whatever name is used, is a signal from a switch or opto thingy on a card
> reader assembly and is surely part of your ghetto reader as well.
>
> Meindert
Hmm, I only have the iso7816-1 to iso7816-4 documents. I googled
iso7816-10 and the title for that is "ISO7816-10 Identification Cards-
Integrated circuits card with contacts. Part 10 : Electrical Interface
for synchronous cards".

Does this only apply to synchronous cards? I'm using the asynchronous
T=0 protocol so I'm not sure if it applies to me.