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When any of the following events occur:
* VCC_PHONE off
* nRST
* RST
we tranmsit the current req_ctx, if there is data pending.
This ensures that for any successive data, the ATR flag in the next
req_ctx containing the data, not in the previous req_ctx. It also
ensures that the ATR is aligned at 0 offset in the new req_ctx, which is
an assumption the host software makes but the previous code didn't
ensure.
Furthermore, we introduce a periodic flushing of any pending but
incomplete req_ctx.
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the statistics count various events like overruns, parity errors,
missing rctx and can dump those stats via USB as well as on the serial
console.
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there is now a high-level command by which we can swithc the VCC
supply of the SIM cards.
For some reason, the _PASS variant (passing through the voltage from the
phone) doesn't seem to work reliably. It might be that we are draining
reverse current throught the LDO once we supply SIM power that way.
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The FPF2005 has no reverse voltage blocker, this is why the 3.3V from
the LDO flows back into VCC_PHONE. It even damages the chip (so says the
datasheet) I corrected the double power source problem by disabling the
LDO (see patch), but still 1.8V does not work and 3.0-3.3V is used. I
have to look for other reasons.
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This is just a temp rework in the 1st generation prototype, as the bus
switch has too high resistance for passing throuhg Vcc from the phone
to the SIM.
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