Pass ISO7816_GetChar return val to higher layers

The return value of ISO7816_GetChar is 0 in case of a timeout
when trying to retrieve values, and status of US_CSR otherwise.

Proper handling of this return value is not yet implemented though.
With the naive approach of just not sending the ATR if it could not
be read the simtrace firmware did not work together with pcsc_scan
AT ALL.
3 files changed
tree: d0969ad8aaec30eb5c299d616e12dcbb2cb0f850
  1. minimal/
  2. sam3s_example/
  3. clk_calc.py