h.galeh
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most of the times we need to work with specified bits of registers . most of the times I see in examples the use of masking
its an unreadable way . now see the form below:
masking for setting GPIO2.1 as output
equivalent of the form above with structures
you see its really more readable and convenient. now add its library
its an unreadable way . now see the form below:
masking for setting GPIO2.1 as output
Code:
LPC_GPIO2->FIODIR |= 0x2;
Code:
#include "myGPIO.h"
GPIO2->DIR1 = 1; // more readable
Code:
typedef struct
{
union {
__IO uint32_t FIODIR;
struct {
__IO uint16_t FIODIRL;
__IO uint16_t FIODIRH;
};
struct {
__IO uint8_t FIODIR0;
__IO uint8_t FIODIR1;
__IO uint8_t FIODIR2;
__IO uint8_t FIODIR3;
};
struct{
unsigned DIR0:1;
unsigned DIR1:1;
unsigned DIR2:1;
unsigned DIR3:1;
unsigned DIR4:1;
unsigned DIR5:1;
unsigned DIR6:1;
unsigned DIR7:1;
unsigned DIR8:1;
unsigned DIR9:1;
unsigned DIR10:1;
unsigned DIR11:1;
unsigned DIR12:1;
unsigned DIR13:1;
unsigned DIR14:1;
unsigned DIR15:1;
unsigned DIR16:1;
unsigned DIR17:1;
unsigned DIR18:1;
unsigned DIR19:1;
unsigned DIR20:1;
unsigned DIR21:1;
unsigned DIR22:1;
unsigned DIR23:1;
unsigned DIR24:1;
unsigned DIR25:1;
unsigned DIR26:1;
unsigned DIR27:1;
unsigned DIR28:1;
unsigned DIR29:1;
unsigned DIR30:1;
unsigned DIR31:1;
};
};
uint32_t RESERVED0[3];
union {
__IO uint32_t FIOMASK;
struct {
__IO uint16_t FIOMASKL;
__IO uint16_t FIOMASKH;
};
struct {
__IO uint8_t FIOMASK0;
__IO uint8_t FIOMASK1;
__IO uint8_t FIOMASK2;
__IO uint8_t FIOMASK3;
};
struct{
unsigned MASK0:1;
unsigned MASK1:1;
unsigned MASK2:1;
unsigned MASK3:1;
unsigned MASK4:1;
unsigned MASK5:1;
unsigned MASK6:1;
unsigned MASK7:1;
unsigned MASK8:1;
unsigned MASK9:1;
unsigned MASK10:1;
unsigned MASK11:1;
unsigned MASK12:1;
unsigned MASK13:1;
unsigned MASK14:1;
unsigned MASK15:1;
unsigned MASK16:1;
unsigned MASK17:1;
unsigned MASK18:1;
unsigned MASK19:1;
unsigned MASK20:1;
unsigned MASK21:1;
unsigned MASK22:1;
unsigned MASK23:1;
unsigned MASK24:1;
unsigned MASK25:1;
unsigned MASK26:1;
unsigned MASK27:1;
unsigned MASK28:1;
unsigned MASK29:1;
unsigned MASK30:1;
unsigned MASK31:1;
};
};
union {
__IO uint32_t FIOPIN;
struct {
__IO uint16_t FIOPINL;
__IO uint16_t FIOPINH;
};
struct {
__IO uint8_t FIOPIN0;
__IO uint8_t FIOPIN1;
__IO uint8_t FIOPIN2;
__IO uint8_t FIOPIN3;
};
struct{
unsigned PIN0:1;
unsigned PIN1:1;
unsigned PIN2:1;
unsigned PIN3:1;
unsigned PIN4:1;
unsigned PIN5:1;
unsigned PIN6:1;
unsigned PIN7:1;
unsigned PIN8:1;
unsigned PIN9:1;
unsigned PIN10:1;
unsigned PIN11:1;
unsigned PIN12:1;
unsigned PIN13:1;
unsigned PIN14:1;
unsigned PIN15:1;
unsigned PIN16:1;
unsigned PIN17:1;
unsigned PIN18:1;
unsigned PIN19:1;
unsigned PIN20:1;
unsigned PIN21:1;
unsigned PIN22:1;
unsigned PIN23:1;
unsigned PIN24:1;
unsigned PIN25:1;
unsigned PIN26:1;
unsigned PIN27:1;
unsigned PIN28:1;
unsigned PIN29:1;
unsigned PIN30:1;
unsigned PIN31:1;
};
};
union {
__IO uint32_t FIOSET;
struct {
__IO uint16_t FIOSETL;
__IO uint16_t FIOSETH;
};
struct {
__IO uint8_t FIOSET0;
__IO uint8_t FIOSET1;
__IO uint8_t FIOSET2;
__IO uint8_t FIOSET3;
};
struct{
unsigned SET0:1;
unsigned SET1:1;
unsigned SET2:1;
unsigned SET3:1;
unsigned SET4:1;
unsigned SET5:1;
unsigned SET6:1;
unsigned SET7:1;
unsigned SET8:1;
unsigned SET9:1;
unsigned SET10:1;
unsigned SET11:1;
unsigned SET12:1;
unsigned SET13:1;
unsigned SET14:1;
unsigned SET15:1;
unsigned SET16:1;
unsigned SET17:1;
unsigned SET18:1;
unsigned SET19:1;
unsigned SET20:1;
unsigned SET21:1;
unsigned SET22:1;
unsigned SET23:1;
unsigned SET24:1;
unsigned SET25:1;
unsigned SET26:1;
unsigned SET27:1;
unsigned SET28:1;
unsigned SET29:1;
unsigned SET30:1;
unsigned SET31:1;
};
};
union {
__O uint32_t FIOCLR;
struct {
__O uint16_t FIOCLRL;
__O uint16_t FIOCLRH;
};
struct {
__O uint8_t FIOCLR0;
__O uint8_t FIOCLR1;
__O uint8_t FIOCLR2;
__O uint8_t FIOCLR3;
};
struct{
unsigned CLR0:1;
unsigned CLR1:1;
unsigned CLR2:1;
unsigned CLR3:1;
unsigned CLR4:1;
unsigned CLR5:1;
unsigned CLR6:1;
unsigned CLR7:1;
unsigned CLR8:1;
unsigned CLR9:1;
unsigned CLR10:1;
unsigned CLR11:1;
unsigned CLR12:1;
unsigned CLR13:1;
unsigned CLR14:1;
unsigned CLR15:1;
unsigned CLR16:1;
unsigned CLR17:1;
unsigned CLR18:1;
unsigned CLR19:1;
unsigned CLR20:1;
unsigned CLR21:1;
unsigned CLR22:1;
unsigned CLR23:1;
unsigned CLR24:1;
unsigned CLR25:1;
unsigned CLR26:1;
unsigned CLR27:1;
unsigned CLR28:1;
unsigned CLR29:1;
unsigned CLR30:1;
unsigned CLR31:1;
};
};
} defLPC_GPIO;
#define GPIO2 ((defLPC_GPIO *) LPC_GPIO2_BASE )