UM0097 datasheet(64/229 Pages) STMICROELECTRONICS

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Peripheral firmware overview

UM0097

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EIC_CurrentFIQChannelValue

Note:

When you use both Timer 0 and Watchdog Timer FIQ interrupts in your application, this

function is required in the FIQ interrupts service routine for software prioritization and to

define which FIQ pending bit you have to clear.

Example:

This example shows how to use the EIC_FIQChannelValue function in the FIQ interrupts

service routine to define the source of FIQ interrupts.

void FIQ_Handler(void)

{

switch (EIC_CurrentFIQChannelValue())

{

case T0TIMI_FIQChannel:

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

/* Clear the corresponding FIQ pending bit */

EIC_FIQPendingBitClear(T0TIMI_FIQChannel);

/*............User code............*/

break;

case WDG_FIQChannel:

WDG->SR = 0x0000; /* Clear the WDG interrupt flag */

/* Clear the corresponding FIQ pending bit */

EIC_FIQPendingBitClear(WDG_FIQChannel);

/*............User code............*/

break;

case WDGT0TIMI_FIQChannels:

WDG->SR = 0x000;

/* Clear the WDG interrupt flag */

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

/* Clear the FIQ pending bits */

EIC_FIQPendingBitClear(WDGT0TIMI_FIQChannels);

/*............User code............*/

break;

}

Function Name

EIC_FIQChannelValue

Function Prototype

FIQChannel_TypeDef EIC_CurrentFIQChannelValue(void);

Behavior Description

This function gets and return the current served FIQ channel number

Input Parameter

None

Output Parameter

None

Return Value

The current served FIQ channel number.

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

values of FIQChannel parameter.

Required Preconditions

None

Called Functions

None

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