Infineon ERU Interrupt 1 Manuel utilisateur

AURIX™ TC2xx Microcontroller Training

V1.0.0

ERU_Interrupt_1

External interrupt generation

Please read the Important Notice and Warnings at the end of this document

Scope of work

The ERU is used to generate an interrupt on each rising and falling

edge at an input pin.

The code example uses the External Request Unit (ERU) to generate an

interrupt for each falling and rising edge at the input pin P02.0. The falling

and rising edges are generated with pin P02.1. If an Interrupt occurs, an LED

will be toggled.

Introduction

›The External Request Unit (ERU) is a versatile event and pattern

detection unit.

›Its main task is the generation of interrupts based on selectable

trigger events at different inputs, e.g. to generate external interrupt

requests if an edge occurs at an input pin.

›The detected events can also be used by other modules to trigger or to

gate module specific actions.

Hardware setup

This code example has been developed

for the board

KIT_AURIX_TC297_TFT_BC-Step.

The two pins P02.0 and P02.1 have to be

connected to each other.

Input Output

Implementation

›To generate an interrupt via a falling and rising edges on an input pin a few

configuration steps are required:

–Initialize external request pin (IfxScuEru_initReqPin())

–Select which edge should trigger the interrupt

(IfxScuEru_enableRisingEdgeDetection() and/or

IfxScuEru_enableFallingEdgeDetection())

–Enable generation of trigger events with the function

IfxScuEru_enableTriggerPulse()

–Choose the output channel by selecting the Output Gating Unit (OGUz) and the

trigger pulse output (TRxz)

–An event from the Event Trigger Logic (ETL0) triggers the OGU0 (signal

TRx0). The function IfxScuEru_connectTrigger() determines the output

channel for the trigger event

–Select the condition to generate an interrupt with the function

IfxScuEru_setInterruptGatingPattern()

–Configure and enable the service request with the functions IfxSrc_init() and

IfxSrc_enable()

›The functions above are provided by the iLLD headers IfxScuEru.h and IfxSrc.h.

Implementation

›The below figures from the AURIX™

TC29x B-Step User’s Manual illustrate

the configuration steps that were

followed in this example.

Implementation

The Interrupt Service Routine (ISR)

Blinking an LED is implemented inside an ISR triggered by the ERU which generates

interrupt requests according to its configuration.

The method implementing the ISR needs to be assigned a priority and a CPU core

responsible for its execution. This is done with the macro IFX_INTERRUPT(isr,

vectabNum, priority).

When triggered, the ISR blinks the LED by toggling the state of the connected pin

using the function IfxPort_setPinState().

Run and Test

After code compilation and flashing the

device, perform the following steps:

1. Connect the two pins P02.0 and

P02.1 to each other.

P02.1 is used to generate the

falling and rising edges by

toggling the state from high to

low. P02.0 is the input of the

ERU which generates the

interrupts on falling and rising

edges.

2. Toggle the P02.1 pin state via

the value of the variable

LEDstate of the structure

g_ERUconfig with the

debugger.

3. Check LED D107 (1) is

changing state when the

variable is modified.

References

›More code examples can be found on the GIT repository:

›https://github.com/Infineon/AURIX_code_examples

›For additional trainings, visit our webpage:

›https://www.infineon.com/aurix-expert-training

›AURIX™ Development Studio is available online:

›https://www.infineon.com/aurixdevelopmentstudio

›Use the „Import...“ function to get access to more code examples.

›For questions and support, use the AURIX™ Forum:

›https://www.infineonforums.com/forums/13-Aurix-Forum

IMPORTANT NOTICE

The information given in this document shall in no

event be regarded as a guarantee of conditions or

characteristics (“Beschaffenheitsgarantie”).

With respect to any examples, hints or any typical

values stated herein and/or any information

regarding the application of the product, Infineon

Technologies hereby disclaims any and all

warranties and liabilities of any kind, including

without limitation warranties of non-infringement

of intellectual property rights of any third party.

In addition, any information given in this

document is subject to customer’s compliance

with its obligations stated in this document and

any applicable legal requirements, norms and

standards concerning customer’s products and

any use of the product of Infineon Technologies in

customer’s applications.

The data contained in this document is exclusively

intended for technically trained staff. It is the

responsibility of customer’s technical

departments to evaluate the suitability of the

product for the intended application and the

completeness of the product information given in

this document with respect to such application.

For further information on the product,

technology, delivery terms and conditions and

prices please contact your nearest Infineon

Technologies office (www.infineon.com).

WARNINGS

Due to technical requirements products may

contain dangerous substances. For information

on the types in question please contact your

nearest Infineon Technologies office.

Except as otherwise explicitly approved by

Infineon Technologies in a written document

signed by authorized representatives of Infineon

Technologies, Infineon Technologies’ products

may not be used in any applications where a

failure of the product or any consequences of the

use thereof can reasonably be expected to result

in personal injury.

Edition 2019-10

Published by

Infineon Technologies AG

81726 Munich, Germany

Do you have a question about this

document?

Email: erratum@infineon.com

Document reference

ERU_Interrupt_1

Trademarks

All referenced product or service names and trademarks are the property of their respective owners.

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