SPI Controller Transfer

Write data to and read data from SPI peripheral device

Since R2023a

Add-On Required: This feature requires the Embedded Coder Support Package for STMicroelectronics STM32 Processors add-on.

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Libraries:
Embedded Coder Support Package for STMicroelectronics STM32 Processors / STM32F4xx Based Boards
Embedded Coder Support Package for STMicroelectronics STM32 Processors / STM32F746G-Discovery
Embedded Coder Support Package for STMicroelectronics STM32 Processors / STM32F769I-Discovery
Embedded Coder Support Package for STMicroelectronics STM32 Processors / STM32F7xx Based Boards
Embedded Coder Support Package for STMicroelectronics STM32 Processors / STM32G4xx Based Boards
Embedded Coder Support Package for STMicroelectronics STM32 Processors / STM32H7xx Based Boards (Single-core)
Embedded Coder Support Package for STMicroelectronics STM32 Processors / STM32U5xx Based Boards
Embedded Coder Support Package for STMicroelectronics STM32 Processors / STM32L475VG-Discovery (B-L475E-IOT01A)
Simulink Coder Support Package for STMicroelectronics Nucleo Boards / Common

Description

The SPI Controller Transfer block accepts a 1-D array and outputs an array of the same size of the uint8, uint16 or uint32 data types

The SPI Controller Transfer block writes data to and reads data from a peripheral device over the Serial Peripheral Interface (SPI). The block runs in controller mode. The block outputs an array of the same size and data type as the input values. You can use this block with the Byte Pack and Byte Unpack blocks for heterogeneous data type transfers.

Using this block, you can access an SPI device to measure quantities such as temperature and pressure.

The SPI receive interrupt is configured for a specific hardware board by navigating to Configuration Parameters > Hardware Implementation > Target hardware resources.

SPI Module is configured in STM32CubeMX project.

• Launch the STM32CubeMX project. For more information, see Configure STM32 Processor-Based Boards using STM32CubeMX with Simulink.

• Navigate to Pinout & Configuration > Connectivity > SPI#

Verify that these settings meet the requirements of your application.

Note

The following are the limitations for SPI block:

• Number of bytes of data to be sent to the transmit block should be less than the FIFO length.

• On running SPI Controller Transfer block in Monitor & Tune, you might observe the junk data. To resolve, reconnect and start Monitor & Tune.

• If SPI Controller Transfer block is used in a model don’t use the SPI Transmit and SPI Receive blocks for the same module.

• Avoid using same modules of SPI in multiple tasks, which can lead to issues.

• SPI blocks do not support Master Receive Only, Slave Receive Only, Master Transmit Only, and Slave Transmit only for SPI mode configuration in STM32CubeMX file.

Examples

Using SPI to Read and Write Data to SPI EEPROM on STM32 Processor

Configure and use SPI blocks to read and write data using Embedded Coder® Support Package for STMicroelectronics® STM32 Processors.

Open Script

Ports

Input

Tx — Data written to registers of SPI peripheral device serial data out (SDO)

vector

The data written by the block to the registers of a peripheral device over the SPI interface.

Data Types: uint8 | uint16 | uint32

Output

Rx — Data read from registers of SPI peripheral device serial data in (SDI)

vector

The data read by the block from the registers of a peripheral device over the SPI interface.

Data Types: uint8 | uint16 | uint32

Parameters

Main

SPI module — SPI module to write and read data

SPI1 (default) | SPI2 | SPI3 | SPI4 | SPI5 | SPI6

The SPI peripheral module to which the SPI peripheral device is connected. Each processor has a different number of modules.

Clock polarity — SPI clock polarity

Low (default) | High

The clock polarity (CPOL) for SPI communication mode.

Clock phase — SPI clock phase

1 Edge (default) | 2 Edge

The clock phase (CPHA) for SPI communication mode.

Enable register address — Enables SPI register address

on (default) | off

Enables the Register address parameter.

Register address — SPI register address

0 (default) | positive integer scalar | positive integer vector

The peripheral register address from which the block reads data.

Note

The positive integer vector is specified as, [2 0 32] for Write Data to Memory and [3 0 32] for Read Data from Memory. For more information, refer to the example Using SPI to Read and Write Data to SPI EEPROM (C2000 Microcontroller Blockset).

Dependencies

This parameter appears only when you select Enable register address.

Advanced

Data bits — Number of bits in SPI transfer

4 (default) | integer in the range [1 32]

Length in bits of each transmitted or received character, specified as an integer in [1 32]. For example, if you select 8, the maximum value that can be transmitted using SPI is 2⁸ – 1. If you send data values greater than this value, the buffer overflows.

Chip select calling method — Method to select SPI peripheral device

Provided by the SPI peripheral (default) | Explicit GPIO calls

The SPI controller uses these methods to select SPI peripheral devices.

• Provided by the SPI peripheral — The SPI controller uses the pin provided by the SPI peripheral. Peripheral select and deselect are handled by the SPI peripheral.

• Explicit GPIO calls — The SPI controller uses the general purpose input/output pins explicitly to select/deselect SPI peripheral devices. The SPI controller Transfer block selects the peripheral before data is transmitted and deselects the peripheral after data is received using GPIO pins.

Chip select pin polarity — SPI peripheral select pin polarity

Active low (default) | Active high

The logic levels supported by the chip select pin to select the SPI peripheral device.

• Active low — The device is enabled on logic low. The SPI peripheral device is enabled when its chip select pin is set to low.

• Active high — The device is enabled on logic high. The SPI peripheral device is enabled when its chip select pin is set to high.

Dependencies

This parameter appears only when Chip select calling method is set to Explicit GPIO calls.

Chip select port name — SPI chip select port name

GPIOA (default) | GPIOB | GPIOC

Select the general purpose port name that serves as the chip select for SPI.

Dependencies

This option appears only when Chip select calling method is set to Explicit GPIO calls.

Chip select pin — SPI peripheral select pin

1 (default) | positive integer scalar

The general purpose input/output pin that serves as chip select for SPI.

Dependencies

This parameter appears only when Chip select calling method is set to Explicit GPIO calls.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2023a