Enable S.BUS TX pin
Build test code for S.BUS output, send test characters once S.BUS1 or S.BUS2 is enabled
test loop
Fix quotation marks
Turn off JTAG completely in a vain attempt to get PB4 free for SBUS enable.
Be more enthusiastic with the sbus enable pin. Still no love.
Don't leave all JTAG off... it will make you very sad
Remove the s.bus test loop... makes it very hard to update the firmware.
Make SBUS output exclusive
Ensure only either S.BUS1 or S.BUS2 can be active at a time
Merge pull request #878 from PX4/sbus_out

S.BUS output