USART - Problem -> write DR Register

aattenberger9 · ‎2009-10-01

Posted on October 01, 2009 at 10:35

aattenberger9 · ‎2011-05-17

Posted on May 17, 2011 at 13:25

Hello together,

I have a problem to use the USART - Port of my STM3210C-EVAL Board.

To start the USART the first time I use the ''USART_Polling'' example from the stm32f10x stdperiph library. But nothing happend the DR - Register was written..

domen2 · ‎2011-05-17

Posted on May 17, 2011 at 13:25

Clock, baudrate, status register, pin remapping, see anything on oscilloscope?

These are the things we can't do for you, and probably can't help without the info.

aattenberger9 · ‎2011-05-17

Posted on May 17, 2011 at 13:25

... now it works!

The problem was the Compiler. I use GCC verion 3.4.1, I set the optmizing level from 0 to level 2 and it works...

st3 · ‎2011-05-17

Posted on May 17, 2011 at 13:25

Quote:

The problem was the Compiler.

That's rather a serious accusation - Are you sure?

In most cases where changing the optimisation level apparently ''fixes'' a bug, it is the source code that is flawed - and the most common flaw is probably failure to use the volatile keyword correctly...