UM0097 datasheet(65/229 Pages) STMICROELECTRONICS

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UM0097

Peripheral firmware overview

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EIC_FIQPendingBitClear

Example:

This example shows how to use of the EIC_FIQPendingBitClear function in the FIQ

interrupts service routine to define the source of FIQ interrupts.

void FIQ_Handler(void)

{

TIM0->SR &= ~0x2000; /* Clear the Timer 0 interrupt flag */

/* Clear the corresponding FIQ pending bit */

EIC_FIQPendingBitClear(T0TIMI_FIQChannel);

}

3.5

General purpose input output (GPIO)

The GPIO driver may be used for several purposes, including pin configuration, reading a

port pin and writing data into the port pin.

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

section presents the GPIO firmware library functions.

3.5.1

Data structures

GPIO register structure

The GPIO peripheral register structure GPIO_TypeDef is defined in the file 71x_map.h as

follows:

typedef struct

{

vu16 PC0;

vu16 EMPTY1;

vu16 PC1;

vu16 EMPTY2;

vu16 PC2;

vu16 EMPTY3;

Function Name

EIC_FIQPendingBitClear

Function Prototype

void EIC_FIQPendingBitClear(FIQChannel_TypeDef

FIQChannel);

Behavior Description

Clears the selected FIQ Pending bit located in FIR register by writing 1

to the corresponding bit.

Input Parameter

FIQChannel: specifies the FIQ channel to be configured.

Refer to FIQ channel enumeration on page 55 for details on allowed

values of FIQChannel parameter.

Output Parameter

None

Return Value

None

Required Preconditions

None

Called Functions

None

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