some small changes to make it work nicely with easy pdk programmer#3

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freepdk wants to merge 1 commit intofree-pdk:masterfrom freepdk:master

+11-10

Commits on Mar 7, 2019

change to 115200 baud, output on PA.7, add leading stop bit generation, add sending initial 0x55 autobaud char
freepdk
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