EKS-LM4F232 PWM example

I am trying to create an example of PWM working on an EKS-LM4F232.  I have an LED that is driven off of PG3.  When used as a GPIO, I can turn the LED on and off, so I conclude that my circuit is working.  I then stop using PG3 as an output pin and set it up to use as a PWM pin.  With a scope on PG3, I see nothing happening.  There are no examples of PWM for the M4 chip, but I have used examples for M3 chips and from Stellaris DRL pdf as a guide. 

I should expect to see PG3 work at a 50% duty cycle for the following code, correct?

I put in a forever loop in order to change the duty cycle via breakpoint and variable modification.

void PWM_Init(void) {

SysCtlPWMClockSet(SYSCTL_PWMDIV_1);

SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM1);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);

GPIOPinConfigure(GPIO_PG3_M1PWM1);

GPIOPinTypePWM(GPIO_PORTG_BASE, GPIO_PIN_3);

ulPeriod = 4000;

PWMGenConfigure(PWM1_BASE, PWM_GEN_0, PWM_GEN_MODE_UP_DOWN | PWM_GEN_MODE_NO_SYNC);

PWMGenPeriodSet(PWM1_BASE, PWM_GEN_0, ulPeriod);

PWMPulseWidthSet(PWM1_BASE, PWM_OUT_1, ulPeriod/2);

PWMOutputState(PWM1_BASE, PWM_OUT_1_BIT, true);

PWMGenEnable(PWM1_BASE, PWM_GEN_0);

while (1) {

int i = ulPeriod;

PWMPulseWidthSet(PWM1_BASE, PWM_OUT_1, i);

}

}

void main(void)

{

// Enable lazy stacking for interrupt handlers.

FPULazyStackingEnable();

// Set the clocking to run directly from the crystal.

SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |

SYSCTL_XTAL_16MHZ);

PWM_Init();