Infineon SPI CPU 1 Manuale utente

AURIX™ TC2xx Microcontroller Training

V1.0.0

SPI_CPU_1

SPI communication via QSPI

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

Scope of work

A QSPI module configured as SPI master sends five bytes to another

QSPI module which is configured as SPI slave.

QSPI2 is configured in master mode and used to send five bytes to QSPI3

configured in slave mode. The received data is read by the CPU and

compared against the transmitted data. Port pin 13.3, to which LED D110 is

connected, indicates the successful transfer.

Introduction

›The Queued Synchronous Peripheral Interface (QSPI) enables

synchronous serial communication with external devices based on the

standardized SPI-bus signals: clock, data-in, data-out and slave select.

›The QSPI works in full duplex mode either as Master or Slave with up to

50 MBit/s.

Hardware setup

This code example has been

developed for the board

KIT_AURIX_TC297_TFT_BC-Step.

Hardware Setup

KIT_AURIX_TC297_TFT_BC-

Step

X103 : QSPI3 (Slave)

WIRE

X102 : QSPI2 (Master)

P02.7 : 20

: SCLKI 

P15.3 : 32 : SCLKO

P02.4 : 17 : SLSI_A



P15.2 : 31 : SLSO_0

P02.5 : 18 : MRST



P15.4

: 33 : MRST_A

P02.6 : 19 : MTSR_A



P15.5 : 34 : MTSR

KIT_AURIX_TC297_TFT_BC-Step

›Use the stencils as

illustrated. ›Connect following pins

as described and

illustrated using wires.

Implementation

Configuring the SPI communication

The configuration of the SPI communication is done once in the setup phase through the

function initQSPI() in two different steps:

›QSPI Slave initialization

›QSPI Master initialization

QSPI Slave initialization

›The initialization of the QSPI slave module is done by defining an instance of the

IfxQspi_SpiSlave_Config structure.

›The structure is filled with default values by the function

IfxQspi_SpiSlave_initModuleConfig().

›Afterwards, the pins and the protocol.dataWidth are modified, due to the fact that the

default data width in slave-mode is 8-bit and it needs to be explicitly specified to 32-bit.

›The function IfxQspi_SpiSlave_initModule() is used to initialize the QSPI slave

module.

›Additionally, the buffers used by the QSPI slave are initialized.

The above functions can be found in the iLLD header IfxQspi_SpiSlave.h.

Implementation

QSPI Master initialization

›The initialization of the QSPI master module is done by defining an instance of the

IfxQspi_SpiMaster_Config structure.

›The structure is filled with default values by the function

IfxQspi_SpiMaster_initModuleConfig().

›Afterwards, the pins are modified.

›The function IfxQspi_SpiMaster_initModule() is used to initialize the QSPI master

module.

›A QSPI module controls 16 communication channels, which are individually

programmable. In this example, the function initQSPI2MasterChannel() initializes the

channel zero using an instance of the structure IfxQspi_SpiMaster_ChannelConfig.

Afterwards, the slave select channel number is set through the parameter sls.output

and the baud rate is modified via the parameter base.baudrate.

›The function IfxQspi_SpiMaster_initChannel() is used to initialize the QSPI master

channel.

›Additionally, the buffers used by the QSPI master are initialized.

The above functions can be found in the iLLD header IfxQspi_SpiMaster.h.

Implementation

QSPI Master Slave communication

›The function transferData() triggers the data transfer between the SPI-Master and

SPI-Slave.

›Additionally, LED D110 connected to port pin 13.3 is used to signal if the transmission

was successful.

Run and Test

After code compilation and programming

the device, perform the following steps:

›Set a breakpoint to transferData() in the

Cpu0_main.c and check the

spiMasterTxBuffer and

spiSlaveRxBuffer inside spiBuffers

structure.

›Run the demo project and check if the

LED D110 (1) is on (Data transmitted

without errors).

›The spiMasterTxBuffer and

spiSlaveRxBuffer now should show the

same transmitted and received data.

›Remove a cable (e.g. SCLKx), perform a

Reset and re-run the application to see

that the data transmission is interrupted

and the LED D110 (1) is off (Data

transmission blocked) .

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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