Infineon STM Interrupt 1 Manual de usuario

AURIX™ TC2xx Microcontroller Training

V1.0.0

STM_Interrupt_1

Interrupt generation via STM trigger

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

Scope of work

The STM is configured to trigger an interrupt every 500 ms. The

interrupt toggles an LED.

The System Timer (STM) module counts up to a configured compare value,

when it reaches the specific value, it triggers an interrupt and resets its

counter value. The value is set to trigger the interrupt every 500 ms; at each

interrupt an LED is toggled.

Introduction

›The System Timer (STM) is a free running 64-bit counter that can be used

for timing applications requiring both high precision and long period.

›Among other features, the STM has the capability to generate interrupts

when its count reaches a predefined compare value.

›The comparison is flexible in terms of bit sets.

Any of the 64 bits of the STM can be selected for comparison.

Hardware setup

This code example has been

developed for the board

KIT_AURIX_TC297_TFT_BC-Step.

Implementation

Configure and control the LED

The LED is toggled by controlling the port pin to which it is connected using functions

from the iLLD header IfxPort.h.

Inside the function initPeripherals(), the port pin is configured to push-pull output

mode using the function IfxPort_setPinMode().

During program execution, inside the interrupt service routine isrSTM(), the LED is

switched on and off using the function IfxPort_setPinState().

Implementation

Configure the STM

Configuration of the STM is done inside the function initSTM() by initializing an

instance of the IfxStm_CompareConfig structure with default values through the

function IfxStm_initCompareConfig().

Then, the following parameters are modified:

›ticks –the total amount of ticks to count before the interrupt generation.

›triggerPriority –priority of the interrupt generated by the STM on compare match.

It can be a value from 0 to 255, with 0 meaning interrupt is disabled and 255 is the

highest priority.

›typeOfService –to define which service provider is responsible for handling the

interrupt. This can be any of the available CPUs or the DMA.

The above functions can be found in the iLLD header IfxStm.h.

Implementation

Configure the Interrupt Service Routine

The function implementing the ISR (isrSTM()) needs to be assigned a priority and a

core responsible for its execution.

This is done with the macro IFX_INTERRUPT(isr, vectabNum, priority).

When triggered, the ISR:

›Instructs the STM to raise the next interrupt after a certain amount of time by

updating its compare register with the function IfxStm_increaseCompare().

›Toggles the LED by changing the state of the port pin using the function

IfxPort_setPinState().

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

STM_Interrupt_1

Trademarks

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

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