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TMS320F280039C: Using GPIO18-X2 as a GPIO

Part Number: TMS320F280039C

Hello, 

I have an external oscillator connected to X1. X2 is unconnected. I need to use X2 as GPIO18. 

I configured the GPIO as below but it still seems not to work:

    GPIO_setPinConfig(GPIO_18_GPIO18);
    GPIO_setDirectionMode(GPIO18_WDOGPET, GPIO_DIR_MODE_OUT);
    GPIO_setPadConfig(GPIO18_WDOGPET, GPIO_PIN_TYPE_STD);
    GPIO_setQualificationMode(GPIO18_WDOGPET, GPIO_QUAL_ASYNC);
    GPIO_writePin(GPIO18_WDOGPET, 1); // Init to 1, active low pet

Looking at TRM is seems I need to change XTALCR bit. What is the code to do this?