Infineon SCU Reset Detection 1 Manuel utilisateur

AURIX™ TC2xx Microcontroller Training

V1.0.0

SCU_Reset_Detection_1

Detection of reset type

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

Scope of work

This example shows how to detect the source of the last reset (power-

on reset, watchdog reset, etc.)

The AURIX™ TC2xx devices can be reset by various reset sources. The

application software is able to determine the source of the last reset based

on a routine that evaluates the related reset special function register.

Introduction

›Resets can be configured and determined in the Reset Control Unit

(RCU), belonging to the System Control Unit (SCU).

›There are various reset triggers such as SupplyMonitor, EVRs, PORST,

ESRx, JTAG.

›Consequently, different reset types can be derived, such as Cold-/Warm-

Power-On Reset, System Reset, Application Reset, Debug Reset, Module

Reset.

Hardware setup

This code example has been

developed for the board

KIT_AURIX_TC297_TFT_BC-Step.

Implementation

startScuResetDetection()

›This function executes the evaluateReset() function, which provides information

about the last occurred reset. The returned value is a data structure comprising

elements such as resetType and resetTrigger.

›The resetType specifies the type of the last reset (e.g. a Cold Power-On Reset,

System Reset, Application Reset or Warm Power-On Reset).

›The resetTrigger specifies the source of the last reset. For instance, the source

can be a Power-On Reset (pressing PORST-Button), a SW triggered reset or a

reset triggered by debugger or any voltage supervision monitor.

›Furthermore, the function evaluateReset() clears the Cold Power-On sticky bits

using the function clearColdPowerOnResetBits(). Those bits are not cleared

automatically and must be explicitly cleared by the application.

›The local variable swReset can be used to specify the type of SW-Reset initiated

by the function triggerSWReset().

Implementation

evaluateReset()

›The function evaluateReset() evaluates both the SCU.RCU.RSTSTAT and

SCU.RCU.RSTCON registers.

›The SCU.RCU.RSTSTAT register is evaluated with regard to which reset bits are

set, respectively, cleared. Firstly, the warm reset status bits comprising ESRx,

SMU,SW, STMx and CBx are evaluated. Secondly, the cold reset status bits

comprising EVR13, EVR33,SWD and STBYR are evaluated if none of the warm

reset status bits are set. Finally, the PORST bit is evaluated.

›The SCU.RCU.RSTCON is evaluated to determine the type of reset, specified for

the warm reset status bits, except debugger related reset sources.

triggerSWReset()

›This function was developed only for testing purposes. Based on the local variable

swReset, it triggers either a SW Application Reset or a SW System Reset.

Run and Test

After code compilation and flashing the device, perform the following steps:

1. Run the code

2. Suspend the code execution

3. Watch the local structure variable lastReset (the elements lastReset.resetType and

lastReset.resetTrigger)

4. Check whether the lastReset.resetType is set to 'application' reset and whether the

lastReset.resetTrigger is set to 'cb3'.

5. Press button 'PORST'

6. Perform steps 1. through 3.

7. Check whether the lastReset.resetType is set to 'warmpoweron' reset and whether

the lastReset.resetTrigger is set to 'porst'.

Run and Test

8. Set the local variable swReset to '1'

9. Perform steps 1. through 3.

10. Check whether the lastReset.resetType is set to 'application' reset and whether the

lastReset.resetTrigger is set to 'sw'.

11. Set the local variable swReset to '2'

12. Perform steps 1. through 3.

13. Check whether the lastReset.resetType is set to 'system' reset and whether the

lastReset.resetTrigger is set to 'sw'.

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

SCU_Reset_Detection_1

Trademarks

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

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