UM0097 datasheet(48/229 Pages) STMICROELECTRONICS

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Peripheral firmware overview

UM0097

48/229

The APB bridges are declared in the same file:

...

#define APB1_BASE

0xC0000000

#define APB2_BASE

0xE0000000

....

#ifndef DEBUG

...

#ifdef _APB1

#define APB1

((APB_TypeDef *)(APB1_BASE+0x10))

#endif /*APB1*/

#ifdef _APB2

#define APB2

((APB_TypeDef *)(APB2_BASE+0x10))

#endif /*APB2*/

...

#else

/* DEBUG */

...

#ifdef _APB1

EXT APB_TypeDef

*APB1;

#endif /*APB1*/

#ifdef _APB2

EXT APB_TypeDef

*APB2;

#endif /*APB2*/

...

#endif

When debug mode is used, APB pointer is initialized in 71x_lib.c file:

#ifdef _APB1

APB1 = (APB_TypeDef *)

(APB1_BASE + 0x10);

#endif

#endif /* _APB1 */

#ifdef _APB2

APB2 = (APB_TypeDef *)

(APB2_BASE + 0x10);

#endif /* _APB2 */

In debug mode the following macros are defined in 71x_conf.h file:

●

_APB is defined to include the APB library

●

_APB1 and _APB2 are defined to access the corresponding peripheral registers.

#define _APB

#define _APB1

#define _APB2

UM0097 Datasheet(PDF) 48 Page - STMicroelectronics

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