The red and green LEDs are now used as follows:
- red on = power (firmware is running)
- red blink = error detected (e.g. during ISO-7816 parsing)
- green on = running (sniffer mode is running)
- green blink = activity (e.g. USB message sent)
Change-Id: Ib1b6ff87fb92d6ed3ecae4bc89386206aaab508e
when the host software does not retrieve the USB messages the memory
is filled and no new USB messages can be allocated, preventing the
following code to print the message
Change-Id: Ie8946894a84cb853b45555f7abb1ca6f32111425
the waiting time (WT) is used to detect timeouts (e.g. for
unresponsive card or just to signal an error/NAK). it is essential
to detect to timeout to end current data transfer (e.g. change state).
by default (after a reset) to timeout is 9600 ETU, but this can change
at two places:
- after the ATR using the value of TC2 (if present)
- after a PPS (only F is used, and not D)
because the timeout value can be larger than the 16-bit of the USART
TO register, an external variable needs to be used for the count down.
Change-Id: I9735660ffce161cec8d4e63fa60a66fc8ef57525
Handling the USB message queue is done in an ISR and take quite some time.
This can cause a USART/SIM sniffing buffer overrun, resulting in data loss.
By setting the USB IRQ lower than the USART IRQ, the USB ISR can be
interrupted (for short) and no data gets lost.
Change-Id: I870a0aa8e251bbb53249c54bfcaa45de5b5a9486
Use USART 0 connected to the SIM card side to sniff the communication.
The card side can also measure ETU times.
Do proper pin initialization.
This code can already capture the ATR communication between phone and card.
Change-Id: I0597ec723cb2225540c89c3821b91d8a45adfcd6
