Infineon ASCLIN LIN Master 1 Manual de usuario

AURIX™ TC2xx Microcontroller Training

V1.0.0

ASCLIN_LIN_Master_1

LIN master communication via ASCLIN module

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

Scope of work

An ASCLIN module is configured as LIN master to send “Hello World!”

The string “Hello World!” is sent via an ASCLIN module configured as LIN

master. The signal can be visualized using an oscilloscope.

Introduction

›The Asynchronous/Synchronous Interface (ASCLIN) module provides

asynchronous serial communication with external devices, using data-in and

data-out signals only.

›A LIN bus consists of one master and typically up to 15 slaves which are

communicating together.

›The LIN protocol configured as a master supports three transactions:

–TxH –Transmission of Header

–TxR –Transmission of Message

–RxR –Reception of Message

›ALIN frame consists of two parts:

–The header, which is always sent by the LIN Master

–The response, which is sent either by the LIN Master or the addressed LIN

Slave

Hardware setup

This code example has been developed for the board

KIT_AURIX_TC297_TFT_BC-Step.

The port pin P15.5 (LIN-TX/RX) should be connected to an oscilloscope

probe.

Ground

TX/RX

Implementation

Configuration of the ASCLIN module:

The function init_ASCLIN_LIN_master() is used to configure the ASCLIN

module in master mode and is called once by CPU0. It contains the following

steps:

1. The module configuration is created with the structure IfxAsclin_Lin_Config

and filled in with default values using the function

IfxAsclin_Lin_initModuleConfig().

2. The LIN module is configured to operate as master by setting the linMode

parameter.

3. The desired baud rate is selected with the parameter brg.baudrate.

4. The pin configuration is set using the predefined structure

IfxAsclin_Lin_Pins.

5. The ASCLIN module is initialized with IfxAsclin_Lin_initModule().

All functions required for the configuration of the ASCLIN module are provided

by the iLLD header IfxAsclin_Lin.h.

Implementation

Transmission of header and response by the master:

Sending the string “Hello World!” is implemented inside the function

send_ASCLIN_message() which is called once after initialization of the

ASCLIN module:

1. The ID byte is set to send a response after the header.

2. The frame “Hello World!” is defined.

3. The correct header is sent with the function IfxAsclin_Lin_sendHeader().

4. The transmission of header is checked by using the parameter

txHeaderEnd of the structure acknowledgmentFlags.

5. The frame is sent with the function IfxAsclin_Lin_sendResponse().

The functions above are provided by the iLLD header IfxAsclin_Lin.h.

Run and Test

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

›Connect the oscilloscope probe to the TX/RX pin (P15.5)

›Reset and run the program by pressing the PORST push button

›Check the oscilloscope for the LIN signal:

Run and Test

›In the signal both the header and the frame „Hello World!“ can be

observed:

›Header ›Frame „Hello World!“

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

ASCLIN_LIN_Master_1

Trademarks

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

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