typedef union _ldopctl_t_ { INT32U Word; struct { INT32U vadj : 6; INT32U reserved : 26; }Bits; }LDO_Ctrl_struct, *pLDO_Ctrl_struct; #define LDO_250V 0x00 #define reg(x, y) (*((volatile x)(y))) #define SYSCTL_LDOPCTL 0x400fe034 /* LDO power control register */ #define RegSysCtl_LDOPCTL (reg(pLDO_Ctrl_struct, SYSCTL_LDOPCTL )) RegSysCtl_LDOPCTL.Bits.vadj = LDO_250V;