Hi

I got Teensy 3.1 with Teensyduino 1.19, Atmel Studio 6.1.2730 SP2, VisualMicro 1.1407.08 and Arduino 1.0.5-r2 installed.
In Define Project I've got: F_CPU=96000000;USB_SERIAL;LAYOUT_US_ENGLISH 

I've got this test sketch:
<<<
void setup()
{
     Serial2.begin(57600);
}

void loop()
{
        delay(1000);
     Serial2.println("AB");
}
>>>

When I measure the Baud Rate with the Oscilloscope I get 86956 instead of 57600. The same Sketch compiled and uploaded from the Arduino IDE works correctly. It seems that the CPU clock ist not taken into account with Atmel Studio, I also noticed that the CPU clock defined in Define Project is not taken into account (does not matter what number I put there). Again this works with Arduino IDE.


Am I missing something? 
Thanks for your help.
Roger

I've just tested it and it appears to work correctly.

Did you use a faster speed for a previous compile?

If so then it would be a good idea to click "Build>Clean Solution". This will remove the temp compiler files and force the core to recompile.

If you do change the defines often then there are two project properties in the "Micro Optimization" category called "Project Defines Affect Core" and "Project Defines Affect Libraries". Setting these to true would automatically perform a build clean prior to compile if the project defines have changed.

I hope this makes sense and proves to be the issue. I will add this to the Teensy documentation page.

Thanks

With the Option "Project Defines Affect Core" = True the changes in CPU clock Speed in the Project Defines are taken into account -> all works fine. 

Is there a possibility to have "Project Defines Affect Core" = True as Default for new Projects?