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stm32l053 usart2 levels

Question asked by crocker.lee on May 27, 2015
Latest reply on May 28, 2015 by crocker.lee
As you can see here:

(Scope trace)

I'm trying to send data out USART2; it seems to be set up correctly and outputting to pin A14, but the voltage levels don't make sense. It's marking high at 3.3v like it should, but low (space) is over 2v, nowhere near 0. Am I doing something wrong?

Must be some setting of the chip, because when I do a hard power-down reset, the problem goes away. Maybe some piece of code on the discovery board is setting something.