Infineon FCE CRC 1 Manuale utente

AURIX™ TC2xx Microcontroller Training

V1.0.0

FCE_CRC_1

FCE CRC calculation

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

Scope of work

The FCE module is used to calculate the CRC of the same message

with different algorithms.

This training shows how to configure the FCE to calculate CRC of a known

message with all supported algorithms (CRC32, CRC16 and CRC8).

The FCE interrupt is enabled to report execution errors.

Any CRC kernel calculation error is indicated by switching ON the related

LED.

Introduction

›The Flexible CRC Engine (FCE) provides a parallel implementation of

Cyclic Redundancy Code (CRC) algorithms.

›FCE module supported algorithms:

–IEEE 802.3 Ethernet CRC32 polynomial

–CCITT CRC16 polynomial

–SAE J1850 CRC8 polynomial

›CRC algorithms are used to calculate message signatures that can be

used to check message integrity during transport over communication.

Hardware setup

This code example has been

developed for the board

KIT_AURIX_TC297_TFT_BC-Step.

Implementation

Demo Initialization

The initialization of the module is done via Fce_Crc_Init(), which contains:

›the FCE module initialization, using the function IfxFce_Crc_initModule()

›the CRC algorithms initialization, using the function IfxFce_Crc_initCrc()

Demo execution

The execution is started with the function Fce_Crc_Demo_Run(), which

calculates:

›CRC32 algorithm, using IfxFce_Crc_calculateCrc32()

›CRC16 algorithm, using IfxFce_Crc_calculateCrc16()

›CRC8 algorithm, using IfxFce_Crc_calculateCrc8()

All functions, needed for using the FCE CRC calculation, are provided by the

iLLD header IfxFce_Crc.h.

FCE Error Interrupt Service Routine

The ISR will be executed in case of a CRC calculation error. It will scan all

kernels status registers and check if error flags are set.

Implementation

Configure and control the LEDs

Four LEDs are configured to be switched on/off by the controlling port pins to

which they are connected using methods from the iLLD header IfxPort.h.

In the setup phase, the port pins of the LEDs have to be configured as push-

pull output using the function IfxPort_setPinMode().

If CRC calculation errors occur, the related LEDs are switched on using the

function IfxPort_setPinLow().

Run and Test

After code compilation and flashing the device, observe the LEDs’ behavior.

All LEDs (1) should be switched Off if all CRC algorithms calculation are

correct (Result = Expected)

Run and Test

›LEDs behavior in case of Error:

–CRC32 Kernel 0 calculation error: D107 switches On

–Could be tested by setting the macro

CRC32_KERNEL0_WRONG_CHECK_VAL to 1

–CRC32 Kernel 1 calculation error: D108 switches On

–Could be tested by setting the macro

CRC32_KERNEL1_WRONG_CHECK_VAL to 1

–CRC16 calculation error: D109 switches On

–Could be tested by setting the macro CRC16_WRONG_CHECK_VAL to 1

–CRC8 calculation error: D110 switches On

–Could be tested by setting the macro CRC8_WRONG_CHECK_VAL to 1

›All macros mentioned above are provided only for test purpose. They allow to

pass a wrong expected value to the FCE CRC kernel which leads to a mismatch

with the calculated one, therefore the error flag will be set and the error interrupt

will be triggered.

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

FCE_CRC_1

Trademarks

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

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