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EK-TM4C1294XL: GPIOs Not Working

Part Number: EK-TM4C1294XL

I am using the EK-TM4C1294XL board and am trying to toggle pins PL0-PL3 of GPIOL but have only been able to toggle PL0.

To configure the port I am using the following function calls:

MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOL);

MAP_GPIOPinTypeGPIOOutput(GPIO_PORTL_BASE, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 );

To write a 0 I use:

MAP_GPIOPinWrite(GPIO_PORTL_BASE, GPIO_PIN_0 , 0 );

To write a 1 I use:

MAP_GPIOPinWrite(GPIO_PORTL_BASE, GPIO_PIN_0 ,1 );

Is there a reason why none of the following statements would work?:

MAP_GPIOPinWrite(GPIO_PORTL_BASE, GPIO_PIN_1 ,1 );

MAP_GPIOPinWrite(GPIO_PORTL_BASE, GPIO_PIN_2 ,1 );

MAP_GPIOPinWrite(GPIO_PORTL_BASE, GPIO_PIN_3 ,1 );

Thanks for all your help.

Jorge