UM0097 datasheet(9/229 Pages) STMICROELECTRONICS

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UM0097

Document and library rules

9/229

Peripherals are declared in 71x_map.h file. This example shows the declaration of the

GPIO peripheral:

#ifndef EXT

#define EXT extern

#endif

...

/* APB2 Base Address definition */

#define APB2_BASE 0xE0000000

#define GPIO0_BASE

(APB2_BASE + 0x3000)

#define GPIO1_BASE

(APB2_BASE + 0x4000)

/* GPIO0 and GPIO1 peripherals declaration */

#ifndef DEBUG

...

#ifdef _GPIO0

#define GPIO0

((GPIO_TypeDef *)GPIO0_BASE)

#endif /*GPIO0*/

#ifdef _GPIO1

#define GPIO1

((GPIO_TypeDef *)GPIO1_BASE)

#endif /*GPIO1*/

...

#else /* DEBUG */

#ifdef _GPIO0

EXT GPIO_TypeDef

*GPIO0;

#endif /*GPIO0*/

#ifdef _GPIO1

EXT GPIO_TypeDef

*GPIO1;

#endif /*GPIO1*/

...

#endif

/* DEBUG */

To enter debug mode you have to define the label DEBUG in 71X_conf.h file. Debug mode

allows you to watch the peripheral registers in a debugger window, but it uses up some

additional memory space and makes the code less efficient. In both cases GPIO0 is a

pointer to the first address of GPIO0 port.

EXT variable is defined in the file 71x_lib.c as follows:

#define EXT

DEBUG mode is initialized as follows in the 71x_lib.c file:

#define DEBUG

#ifdef DEBUG

void debug(void)

{

#ifdef _GPIO0

GPIO0 = (GPIO_TypeDef *)GPIO0_BASE;

#endif

UM0097 Datasheet(PDF) 9 Page - STMicroelectronics

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