/* The function is used to Unlock protected registers.  */
xtBoolean SysCtlKeyAddrUnlock(void)
/* The function is used to Unlock protected registers.  */
xtBoolean SysCtlKeyAddrUnlock(void)
{
    while(xHWREG(GCR_REGLOCK) != 0x01){
        xHWREG(GCR_REGLOCK) = 0x59;
        xHWREG(GCR_REGLOCK) = 0x16;
        xHWREG(GCR_REGLOCK) = 0x88;
    }
    return 1;
}