Infineon SMU IR Alarm 1 User manual

AURIX™ TC2xx Microcontroller Training
V1.0.0
SMU_Reset_Alarm_1
Reset 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 resets the device as preconfigured
reaction.
The Safety Management Unit (SMU) is configured to trigger a reset if an
internal software alarm occurs.
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Introduction
›The Safety Memory 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 a reset.
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Hardware setup
This code example has been
developed for the board
KIT_AURIX_TC297_TFT_BC-Step.
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Implementation
Configure the SMU module
›To trigger a reset 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 modification, the SMU registers
have to be locked again using the function IfxSmu_lock().
–To modify SMU configuration registers, it is required to clear and set
the Safety ENDINIT protection. This is done with the functions
IfxScuWdt_clearSafetyEndinit() and IfxScuWdt_setSafetyEndinit().
–To enable the SMU reset, the SMU field of the Reset Configuration
Register (RSTCON) has to be set to 0x1 for a system reset or 0x2 for
an application reset (SCU_RSTCON.B.SMU = 0x1).
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Implementation
Configure the SMU module (cont.)
–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 SCU reset (IfxSmu_AlarmConfig_scuReset) are selected. The
iLLD function itself selects the group based on the above mentioned
parameters.
–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.
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Implementation
Triggering of the alarm
›The Software Alarm 0 can be triggered with the function
IfxSmu_triggerAlarm() provided by the iLLD header IfxSmu.h.
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Run and Test
After code compilation and flashing the device, check if LED D106 (1) is
turned on.
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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
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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.
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Document reference
SMU_Reset_Alarm_1
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