Setting port as output, turn on led

Hello everyone. I have an evaluation kit EKK-LM3S9B96. I try to write simply program, just turn on led. I think i do it good and i don't know where i do mistake.

#include <LM3Sxxxx.H>
int main()
{
        GPIODirModeSet(GPIO_PORTD_BASE,GPIO_PIN_7,GPIO_DIR_MODE_OUT);
        GPIOPinWrite(GPIO_PORTD_BASE,GPIO_PIN_7,0xff);
}

I set pin 7 as out and next put there 1. I would be greatfull for some help.