Infineon SMU IR Alarm 1 User manual

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.
2
2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.

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.
3
2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.

Hardware setup
This code example has been
developed for the board
KIT_AURIX_TC297_TFT_BC-Step.
4
2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.

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.
5
2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.

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.
6
2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.

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).
7
2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.

Run and Test
After code compilation and flashing the device, check if LED D107 (1) is
turned on.
1
8
2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.

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
9
2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.

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
© 2019 Infineon Technologies AG.
All Rights Reserved.
Do you have a question about this
document?
Email: [e-mail]
Document reference
SMU_IR_Alarm_1
Trademarks
All referenced product or service names and trademarks are the property of their respective owners.