CW TX firmware for eval-clock
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Sends CW and FELDHELL https://www.qsl.net/zl1bpu/HELL/Feld.htm

Taken from ../picardy and then adapted. Includes two FELDHELL fonts from fldigi, therefore the project is also
GPL-licensed, and my own code is MIT licensed.

pios are different than on picardy: both Si5351 and display are on same i2c

PB3 is PTTOUTn
PB15 is CWOUTn


Programming
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Put target in reset

    make openocd

    cargo run

Deassert RESET

    gdb% load
    gdb% cont