MSP430G2553: MSP430G2553 for controlling a FET gate

Hello

I am using one of the MSP430 pins for controlling a FET. I am using the code below, however it seems that I does not work (I am checking my circuit with ans oscilloscope)

Would please take a look at this piece of code and advice if there is something wrong.

ps: from the FET data sheet, the threshold voltage for the gate is 0.5 - 1 volt

Thank you

void CirciutOn()
{
	// Configure external power supply control pin
	P1IE &= ~EXTERNAL_POWER_PIN;	// Disable interrupt
	P1REN &= ~EXTERNAL_POWER_PIN;	// Disable pullup/pulldown resistor

	P1SEL &= ~EXTERNAL_POWER_PIN;	
	P1SEL2 &= ~EXTERNAL_POWER_PIN; 

	P1OUT &= ~EXTERNAL_POWER_PIN;//P1.1, output as low, external power supply is enabled
	P1DIR |= EXTERNAL_POWER_PIN;	// P1.1, set the direction as output
}

void CirciutOff()
{
	P1IE &= ~EXTERNAL_POWER_PIN; // Disable interrupt
	P1REN &= ~EXTERNAL_POWER_PIN; // Disable resistors, get 3V out
	P1SEL &= ~EXTERNAL_POWER_PIN; // Normal, output
	P1SEL2 &= ~EXTERNAL_POWER_PIN; // Normal, output

	P1OUT |= EXTERNAL_POWER_PIN; // HIGH OUTPUT, turn off Amp
	P1DIR |= EXTERNAL_POWER_PIN;	// P1.1, set the direction as output
}