C28x SPI Master Transfer

Write data to and read data from SPI slave device

• Library:

• Embedded Coder Support Package for Texas Instruments C2000 Processors / C2802x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / C2803x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / C2805x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / C2806x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / C280x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / C281x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / C2833x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / C2834x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / F2807x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / F2837xD

  Embedded Coder Support Package for Texas Instruments C2000 Processors / F2837xS

  Embedded Coder Support Package for Texas Instruments C2000 Processors / F2838x/ C28x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / F28004x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / F28002x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / F28003x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / F28M35x / C28x

  Embedded Coder Support Package for Texas Instruments C2000 Processors / F28M36x / C28x

• 

Description

The C28x SPI Master Transfer block writes data to and reads data from a slave device over the Serial Peripheral Interface (SPI). The block runs in master 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.

Configure the SPI modules for the specific hardware board by navigating to Hardware Implementation > Target hardware resources. Verify that these settings meet the requirements of your application.

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

Ports

Input

Tx — Data written to registers of SPI slave device (MOSI)

vector

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

Data Types: uint16

Output

Rx — Data read from registers of SPI slave device (MISO)

vector

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

Data Types: uint16

Parameters

Main

SPI module — SPI module to write and read data

SPI_A (default) | SPI_B | SPI_C | SPI_D

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

Clock polarity — SPI clock polarity

Rising_edge (default) | Falling_edge

The clock polarity (CPOL) for SPI communication mode.

Clock phase — SPI clock phase

No_delay (default) | Delay_half_cycle

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 slave 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.

Dependencies

This parameter appears only when you select Enable register address.

Advanced

Data bits — Number of bits in SPI transfer

8 (default) | integer in the range [1 16]

Length in bits of each transmitted or received character, specified as an integer in [1 16]. 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.

Slave select calling method — Method to select SPI slave device

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

The SPI master uses these methods to select SPI slave devices.

• Provided by the SPI peripheral — The SPI master uses the STE pin assignment parameter in Hardware Implementation > Target Hardware Resources > SPI to select the slave device. Slave select and deselect are handled by the SPI peripheral.

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

Slave select pin polarity — SPI slave select pin polarity

Active low (default) | Active high

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

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

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

Dependencies

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

Slave select pin — SPI slave select pin

1 (default) | positive integer scalar

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

Dependencies

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

Model Examples

Using SPI to Read and Write Data to SPI EEPROM

Configure and use SPI blocks to read and write data.

Open Example

Version History

Introduced in R2017b