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testapp1
========
On startup, transmit callsign, then start transmitting CW codes:
+--------+-----------+
| sign | timeslot |
+--------+-----------+
| E | 1 |
| I | 2 |
| S | 3 |
| H | 4 |
| err | permanent |
+--------+-----------+
CW is output on PB0, noninverted logic.
When SYNCn input on PB2 goes to zero, transmission stops, and the internal time is set to 0.
Modes
-----
Sync mode:
When internal time < 10 minutes, transmit only sign without "MO", in short timeslots, then stay silent 30s.
Normal mode:
If internal time >= 10 minutes, transmit "MO<sign>" for a full minute timeslot.
Permanent mode:
At startup and before sync, all foxes start in permanent mode.
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