UM0097 datasheet(75/229 Pages) STMICROELECTRONICS

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UM0097

Peripheral firmware overview

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GPIO_WordWrite

Example:

This example sets all the GPIO0 port pins.

{

/*Set all the GPIO0 port pins */

GPIO_WordWrite(GPIO0, 0xFFFF);

}

3.6

External Interrupts (XTI)

The XTI driver may be used for several purposes, such as firmware IRQ generation,

enabling and disabling interrupt lines, selecting the edge sensitivity, interrupt or Wake-up

mode.

The first section describes the data structure used in the XTI firmware library. The second

section presents the XTI firmware library functions.

3.6.1

Data structures

XTI register structure

The XTI peripheral register structure XTI_TypeDef is defined in the file 71x_map.h as

follows:

typedef volatile struct

{

vu8

SR;

EMPTY1[7];

vu8

CTRL;

EMPTY2[3];

vu8

MRH;

Function Name

GPIO_WordWrite

Function Prototype

void GPIO_WordWrite (GPIO_TypeDef *GPIOx,

u16 Port_Val);

Behavior Description

Writes a value in to the selected data port register.

Input Parameter 1

GPIOx: selects the port. x can be 0, 1 or 2.

Refer to GPIOx values on page 68 for details on the allowed values of

this parameter.

Input Parameter 2

Port_Val: holds the word value to be written to the selected data port.

Output Parameter

None

Return Value

None

Required preconditions

The port pin must be configured as GPIO_OUT_OD or as

GPIO_OUT_PP.

Called Functions

None

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