Infineon SMU IR Alarm 1 Bedienungsanleitung

AURIX™ TC2xx Microcontroller Training

V1.0.0

SMU_IR_Alarm_1

Interrupt triggered by an SMU alarm

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

Scope of work

The SMU triggers an alarm, which has, as preconfigured reaction, an

interrupt. The interrupt turns on an LED.

The Safety Management Unit (SMU) is configured to trigger an interrupt if an

internal software alarm occurs. In case of an alarm, an LED will be turned on

inside the Interrupt Service Routine.

Introduction

›The Safety Management Unit (SMU) is a central and modular component

of the safety architecture, providing a generic interface to manage the

behavior of the microcontroller under the presence of faults.

›The SMU centralizes all the alarm signals related to the different

hardware- and software-based safety mechanisms.

›Each alarm can be individually configured to trigger internal or external

actions.

›The SMU, in combination with the embedded safety mechanisms, is able

to detect and report more than 99% of the critical failure modes.

›In this example, Software Alarm 0 is used to trigger an interrupt.

Hardware setup

This code example has been

developed for the board

KIT_AURIX_TC297_TFT_BC-Step.

Implementation

Configure the SMU module

›To trigger an interrupt with an SMU alarm, a few steps are required:

–To modify the SMU registers, the SMU module has to be unlocked with the function

IfxSmu_unlock(). After the modification is finished, the SMU registers should be locked again

using the function IfxSmu_lock().

–Additionally, it is required to clear and set the Safety ENDINIT protection before and after the

modification of the SMU configuration registers. This is done with the functions

IfxScuWdt_clearSafetyEndinit() and IfxScuWdt_setSafetyEndinit().

–The Alarm Global Configuration register (SMU_AGC) provides the software interface to control

how the SMU triggers interrupt requests to the interrupt router. By setting the IGCS0 bitfield to

1, SMU Interrupt Request 0 is triggered.

–The function IfxSmu_setAlarmConfig() configures the alarm’s behavior by writing a 3-bit code

to the three Alarm Configuration Registers associated to the specific alarm and its group. In this

example, the software alarm 0 (IfxSmu_Alarm_SoftwareAlarm0) and the Interrupt Generation

Configuration Set 0 (IfxSmu_AlarmConfig_interruptSet0) are selected. The iLLD function

itself selects the group based on the above mentioned parameters.

–Configure and enable the SMU Service Request 0 with the functions IfxSrc_init() and

IfxSrc_enable().

–Start the SMU state machine (SSM) with the function IfxSmu_cmd() and the parameter

IfxSmu_Cmd_start.

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

Implementation

LED configuration

›The port pin with the connected LED is configured to push-pull output mode by calling the function

IfxPort_setPinMode() with the parameter IfxPort_Mode_outputPushPullGeneral (enumerated

type value).

›With the function IfxPort_setPinState(), using the enumerated type value IfxPort_State_high,

the LED is turned off as default state.

All functions above are provided by the iLLD header IfxPort.h.

Triggering of the alarm

›The Software Alarm 0 can be triggered with the function IfxSmu_triggerAlarm() provided by the

iLLD header IfxSmu.h.

Implementation

The Interrupt Service Routine (ISR)

›The alarm status flag reset is implemented inside the ISR triggered by the SMU

(IfxSmu_clearAlarm()). In order to enable the clearing of the alarm, the command

IfxSmu_cmd(IfxSmu_Cmd_enableClearAlarmStatus) is required. Both functions are provided

by the iLLD header IfxSmu.h.

›The LED is turned on inside the ISR to indicate the successful configuration of the SMU and the

triggering of the interrupt. This is done by setting the port pin of the connected LED by using the

function IfxPort_setPinState() from the iLLD header IfxPort.h.

›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).

Run and Test

After code compilation and flashing the device, check if LED D107 (1) is

turned on.

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

SMU_IR_Alarm_1

Trademarks

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