Infineon GTM TOM Interrupt 1 Manual de usuario

AURIX™ TC2xx Microcontroller Training

V1.0.0

GTM_TOM_Interrupt_1

GTM TOM interrupt

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

Scope of work

The GTM TOM is configured to trigger an interrupt every 500 ms. The

interrupt toggles an LED.

The Generic Timer Module triggers an interrupt every 500 ms.

The state of the port pin, where the LED is connected, is toggled inside the

Interrupt Service Routine (ISR).

Introduction

›The Generic Timer Module (GTM) is a modular timer unit designed to

accommodate many timer applications.

›It has an in-built Timer Output Module (TOM) that can offers 16

independent channels to generate output signals.

›The Clock Management Unit (CMU) is responsible for clock generation of

the GTM. The Fixed Clock Generation (FXU) is one of its subunits and it

provides five predefined non-configurable clocks for GTM modules,

including the TOM.

Hardware setup

This code example has been

developed for the board

KIT_AURIX_TC297_TFT_BC-Step.

LED D107 (1) is used for this

example.

Implementation

Configuring the TOM

The configuration of the TOM is done once in the setup phase by calling the

initialization function initGtmTom() with the following steps:

›Enable the GTM by calling the function IfxGtm_enable().

›The function IfxGtm_Tom_Timer_initConfig() initializes an instance of the

structure IfxGtm_Tom_Timer_Config with its default values.

›The IfxGtm_Tom_Timer_Config structure allows to set the following parameters

to initialize the module:

–tom –Set TOM 1

–timerChannel –Set channel 0 of TOM 1

–clock –Select CMU clock 0

–base.frequency –Set timer frequency to 2 Hz (Interrupt every 500 ms)

–base.isrPriority –Interrupt Service Routine priority

–base.isrProvider –Interrupt Service Routine provider

Implementation

Configuring the TOM

›Select the FXU clock 3 to divide the clock source by 4096 (timerConfig.clock =

IfxGtm_Tom_Ch_ClkSrc_cmuFxclk3).

›Enable the FXU clocks by calling the function IfxGtm_Cmu_enableClocks().

›The function IfxGtm_Tom_Timer_init() initializes and activates the TOM with the

given configuration.

All the functions used for the configuration of the TOM are provided by the iLLD

header IfxGtm_Tom_Timer.h.

Implementation

Configuring the LED

The LED configuration is done once in the function initGtmTom() by setting the port

pin mode to output and push-pull by calling the function

IfxPort_setPinModeOutput(), provided by iLLD header IfxPort.h.

Interrupt Service Routine (ISR)

The ISR implemented in this example contains the following steps:

›Clear the timer event with the function

IfxGtm_Tom_Timer_acknowledgeTimerIrq() (iLLD header

IfxGtm_Tom_Timer.h).

›Change the LED state by calling the function IfxPort_togglePin() (iLLD header

IfxPort.h).

Run and Test

After code compilation and flashing the device, observe the LED D107 (1),

which should be blinking.

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

GTM_TOM_Interrupt_1

Trademarks

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

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