Timer triggering ADC

using Tiva launchpad, TM4C123GH6PM

Still learning. Hoping somebody can spot what's wrong. I'm trying to setup a timer to trigger ADC. 

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    // ***** ADC STUFF *****

    // Debug Blip PA6
    GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_6);

    // The ADC0 peripheral must be enabled for use.
    SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);

    // Enable the GPIO port that hosts the ADC
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);

    // Select the analog ADC function for PE3.
    GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_3);

    ADCSequenceConfigure(ADC0_BASE, 2, ADC_TRIGGER_TIMER, 0);

    // Since sample sequence 2 is now configured, it must be enabled.
    ADCSequenceEnable(ADC0_BASE, 2);

    // Clear the interrupt status flag.
    ADCIntClear(ADC0_BASE, 2);



    // Enable the Timer peripheral
    SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);

    // Timer should run periodically
    TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);

    // Set the value that is loaded into the timer everytime it finishes
    //   it's the number of clock cycles it takes till the timer triggers the ADC
    #define F_SAMPLE 	1000
    TimerLoadSet(TIMER0_BASE, TIMER_A, SysCtlClockGet()/F_SAMPLE);

    // Enable triggering
    TimerControlTrigger(TIMER0_BASE, TIMER_A, true);


    // Enable processor interrupts.
   	IntMasterEnable();

   	ADCIntEnable(ADC0_BASE, 2);

	// Enable the timer
	TimerEnable(TIMER0_BASE, TIMER_A);



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void ADC0IntHandler(void) {

	// Clear the interrupt status flag.
	ADCIntClear(ADC0_BASE, 2);

	// Ignore the data for now

	// Debug Blip Hi
	GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6, GPIO_PIN_6);

	// Debug Blip Lo
	GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6, 0);


}