Infineon PWM Buzzer 1 Bedienungsanleitung

AURIX™ TC2xx Microcontroller Training

V1.0.0

PWM_Buzzer_1

PWM controlled melody on Buzzer

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

Scope of work

The GTM unit is used to play a PWM-controlled song with a piezo

buzzer.

The generated PWM (Pulse-Width Modulation) signal is controlled by timer

TOM1 of the GTM block. The signal drives the piezo buzzer via the pin 0 of

the port 33.

Introduction

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

accommodate many timer applications.

›The Timer Output Module (TOM), which is part of the GTM, offers sixteen

independent channels to generate output signals.

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

the GTM. The Fixed Clock Generation (FXU), subunit of the CMU,

provides five predefined non-configurable clocks for the TOM

submodules.

Hardware setup

This code example has been

developed for the board

KIT_AURIX_TC297_TFT_BC-Step.

The piezo buzzer (1) is used for this

example. 1

Implementation

Initialization of PWM Buzzer

The initialization of the PWM Buzzer is done once in the setup phase by calling the function

initPWMBuzzer(), which contains the following steps:

›Initialize the time constants by calling the service function initTime() from iLLD header file

Bsp.h

›Enable the GTM by calling the function IfxGtm_enable()

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

›Initialize the timer configuration with default values by calling the function

IfxGtm_Tom_Timer_initConfig()

›Set the timer configuration variable timerCfg with the user defined values

›Initialize the timer through the iLLD function IfxGtm_Tom_Timer_init()

›Enable the GTM TOM channel 4 by calling the iLLD function

IfxGtm_Tom_Tgc_enableChannelsUpdate()

All the functions used for the configuration of the PWM Buzzer are provided by the iLLD header

IfxGtm_Tom_Pwm.h.

Implementation

Configuration of the variable timerCfg

Setting of the timerCfg variable is done once in the setup phase in the function

initPWMBuzzer() with the following steps:

›Set TOM1 as the timer for generating the PWM signal

timerCfg.tom = IfxGtm_Tom_1

›Set the channel 4 of TOM1 as the channel used for the timer

timerCfg.timerChannel = IfxGtm_Tom_Ch_4

›Select the clock source

timerCfg.clock = IfxGtm_Tom_Ch_ClkSrc_cmuFxclk2

›Set port and pin for PWM output

timerCfg.triggerOut = &IfxGtm_TOM1_4_TOUT22_P33_0_OUT

›Enable TOM channel

timerCfg.base.trigger.enabled = TRUE

›Enable TOM channel output

timerCfg.base.trigger.outputEnabled = TRUE

›Starting PWM with rising edge

timerCfg.base.trigger.risingEdgeAtPeriod = TRUE

Implementation

Playing song

The song is played by repeatedly calling the function playTone() for each note, which contains

the following steps:

1. Set the PWM frequency (in Hz) through the iLLD function

IfxGtm_Tom_Timer_setFrequency()

2. Set the volume level by calling the function setVolume(). This is done by setting the PWM

duty cycle with the function IfxGtm_Tom_Timer_setTrigger()

3. Start the timer with the iLLD function IfxGtm_Tom_Timer_run()

4. Wait until the end of the note through the service function waitTime()

5. Stop the timer with the iLLD function IfxGtm_Tom_Timer_stop()

PWM signal

Period of PWM

Duty cycle of the PWM

Sound duration

Run and Test

After code compilation and flashing the device, listen to the Buzzer (1) which

should play the sound from the game Super Mario.

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

PWM_Buzzer_1

Trademarks

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

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