Hello, Guthrie<br>
<br>
About 1yrs ago, I tried to integrate UART fingerprint scanner to GnuK firmware. <br>
<br>
I forked chopstx to add UART driver and added fingerprint scanner as pin input device to GnuK.<br>
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You can get code for my hacks(quite dirty..) from this repos.<br>
<br>
<a href="https://github.com/perillamint/gnuk-fpr">https://github.com/perillamint/gnuk-fpr</a><br>
<br>
<a href="https://github.com/perillamint/chopstx">https://github.com/perillamint/chopstx</a><br>
<br>
I hope this could help you.