Serial smartcard reader sends data which should be processed.
In the USART1 IRQ a status variable is set to show that data has
arrived, which should be checked for in the main function.
The second argument for PIO_Configure is the list size,
which can be determined using the macro PIO_LISTSIZE.
You should pass the list (which is an array of pins) to it.
Refrain from passing the ADDRESS of the list to it, otherwise
the pin configuration is never applied and you find yourself
debugging for 3 days.
In other words:
It's working, don't touch it or it will break again!
When the SIM card adapter, which is usually plugged into a phone,
is plugged into a CCID reader instead, the CCID reader triggers
the reset line of the RST line and therefore a PIO interrupt.
The reader then waits for an ATR from the smartcard,
which should be send next.
Currently the smartcard insertion interrupt is always triggered,
but when checking in PIO_ISR which pin triggered the interrupt
often times DTXD is returned (the debug transmit line which is printing
debug messages at the moment..)
