UM0097 datasheet(8/229 Pages) STMICROELECTRONICS

8 / 229 page

Document and library rules

UM0097

8/229

typedef volatile signed long

vs32;

typedef volatile signed short vs16;

typedef volatile signed char

vs8;

●

bool type is defined in the file 71x_type.h as:

typedef enum

{

FALSE = 0,

TRUE

= !FALSE

} bool;

●

FlagStatus type is defined in the file 71x_type.h. Two values can be assigned to this

variable: SET or RESET.

typedef enum

{

RESET = 0,

SET

= !RESET

} FlagStatus;

●

FunctionalState type is defined in the file 71x_type.h. Two values can be assigned to

this variable: ENABLE or DISABLE.

typedef enum

{

DISABLE = 0,

ENABLE

= !DISABLE

} FunctionalState;

●

Pointers to peripherals are used to access the peripheral control registers. Peripheral

pointers point to data structures that represent the mapping of the peripheral control

registers. A structure should be defined for each peripheral in 71x_map.h file. The

example below illustrates the GPIO register structure declaration:

typedef volatile struct

{

vu16 PC0;

vu16 EMPTY1;

vu16 PC1;

vu16 EMPTY2;

vu16 PC2;

vu16 EMPTY3;

vu16 PD;

} GPIO_TypeDef;

EMPTYi (i is an integer that indexes the reserved field) replaces a reserved field and is

never used.

Sometimes an enumeration is needed for a peripheral. This enumeration is called

PPP_Registers and is declared in the file 71x_ppp.h, e.g.:

typedef enum

{

GPIO_PC0 = 0x00,

GPIO_PC1 = 0x04,

GPIO_PC2 = 0x08,

GPIO_PD

= 0x0C,

} GPIO_Registers;

UM0097 Datasheet(PDF) 8 Page - STMicroelectronics

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