Geoff Elgey wrote:
G'day,
I've written a IFD handler for a memory card, but I am now wondering
if I am handling the IFDHPowerICC() function correctly.
The function documentation defines the 'action' parameter as follows:
* IFD_POWER_UP
Power and reset the card if not done so
* IFD_POWER_DOWN
Power down the card then power up if not done already
So what is the difference between "power up and reset" (the
IFD_POWER_UP action) and "power down and power up" (the
IFD_POWER_DOWN action)?
The IFD_POWER_DOWN case does not mention card reset after power up.
What does it mean (in terms of card state) to have a card that is
powered up but not reset?
For compliance with ISO/IEC 7816, the card reader must follow the
correct sequence when powering up the card, i.e. must ensure that the
card is held in the Reset state until power (and, for a microprocessor
card, clock) is established as specified in the standard. If, however,
your card is not 7816 compliant (e.g. if it is an I2C card), you are
outside the coverage of 7816.
Peter
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