Infineon ASCLIN SPI Master 1 Manual de usuario

AURIX™ TC2xx Microcontroller Training

V1.0.0

ASCLIN_SPI_Master_1

SPI master communication via ASCLIN module

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

Scope of work

An ASCLIN module configured as SPI master sends a two bytes

message.

The two bytes message is sent through MTSR (MOSI) port pin P15.4 in

loopback mode. This signal can be visualized on the oscilloscope screen.

Introduction

›The Asynchronous/Synchronous Interface (ASCLIN) module provides

synchronous serial communication like SPI with external devices, using

data-in and data-out signals only.

›The ASCLIN module in SPI configuration can support master mode only

with four-wire or three-wire (without slave select output signal) and up to

16-bit data width.

This code example has been developed for the

board KIT_AURIX_TC297_TFT_BC-Step.

The port pin P15.4 (SPI-MTSR) should be

connected to the port pin P15.5 (SPI-MRST) in

order to form an internal loopback.

Those pins can also be connected to an

oscilloscope probe for observing the SPI

signal.

Hardware setup

Ground

MRST MTSR

Implementation

Configuration of the ASCLIN module:

Configuration of the ASCLIN module for SPI communication is done in the setup phase by

initializing an instance of the IfxAsclin_Spi_Config structure with the following

parameters:

›baudrate –structure to set the actual communication speed in bit/s

›interrupt –structure to set:

–transmit and receive interrupt priorities (txPriority, rxPriority)

–typeOfService –defines which service provider is responsible for handling the

interrupt, which can be any of the available CPUs, or the DMA

›pins –structure to set which GPIO port pins are used for the communication

›rxBuffer, rxBufferSize,txBuffer, txBufferSize –to configure the buffers that will hold

the incoming/outgoing data

The function IfxAsclin_Spi_initModuleConfig() fills the configuration structure with

default values and IfxAsclin_Spi_initModule() initializes the module with the user

configuration.

All the above functions can be found in the iLLD header IfxAsclin_Spi.h.

Implementation

The SPI message exchange function:

›The data-out (MTSR/MOSI) is connected via internal loopback to the data-in

(MRST/MISO).

›The two bytes message is sent via the function exchange_ASCLIN_SPI_message()

which is called once after initialization of the ASCLIN module.

›The two bytes message is sent from the g_spiTxBuffer to the g_spiRxBuffer using

the function IfxAsclin_Spi_exchange() from the IfxAsclin_Spi.h header file.

Run and Test

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

›Connect the oscilloscope probe to the MTSR pin (P15.4)

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

›Check the oscilloscope for the SPI signal:

Start

Stop

Start

Stop

Byte 1 Byte 2

Run and Test

An additional test without using an oscilloscope can be performed with the

debugger.

›Before transmission, the buffer g_spiTxBuffer is filled with a two bytes

message and the buffer g_spiRxBuffer is empty.

›After transmission, both buffers should hold the same message:

–By using the debugger, you can watch the content of both buffers

before and after transmission by setting a breakpoint to

exchange_ASCLIN_SPI_message().

–When reaching this breakpoint, check the content of both buffers (it

should be different).

–After stepping over this function, the content of the buffers must be

equal.

Note: The code should run for a few seconds in order to grant enough time

for the transmission to be done.

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_SPI_Master_1

Trademarks

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

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