SPI Register Read

Read from register of SPI device connected to NVIDIA Jetson board

Since R2026a

• 

Libraries:
NVIDIA Jetson and NVIDIA DRIVE / Communication

Description

Add-On Required: This feature requires the MATLAB Coder Support Package for NVIDIA Jetson and NVIDIA DRIVE Platforms add-on.

The SPI Register Read block reads data from the register of a Serial Peripheral Interface (SPI) device connected to an NVIDIA^® Jetson™ board.

Ports

Output

Port_1 — Data read from register

scalar | vector

Data read from the register of the SPI device, returned as a scalar or a column vector. The Output data type parameter determines the output data type. The output is an N-by-1 vector, where N is the integer specified by the Output data length parameter.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32

Parameters

To edit block parameters interactively, use the Property Inspector. From the Simulink^® Toolstrip, on the Simulation tab, in the Prepare gallery, select Property Inspector.

Board — Hardware board to deploy to

NVIDIA Jetson TX2 Developer Kit (default) | NVIDIA Jetson AGX Xavier Developer Kit | NVIDIA Jetson AGX Orin Developer Kit | NVIDIA Jetson Xavier NX Developer Kit | NVIDIA Jetson Orin Nano Developer Kit | NVIDIA Jetson Nano Developer Kit

Hardware board to deploy the model to.

Programmatic Use

To set the block parameter value programmatically, use the set_param (Simulink) function.

To get the block parameter value programmatically, use the get_param (Simulink) function.

Parameter:	Board
Values:	"NVIDIA Jetson TX2 Developer Kit" | "NVIDIA Jetson AGX Xavier Developer Kit" | "NVIDIA Jetson AGX Orin Developer Kit" | "NVIDIA Jetson Xavier NX Developer Kit" | "NVIDIA Jetson Orin Nano Developer Kit" | "NVIDIA Jetson Nano Developer Kit"

Example: set_param(gcb,"Board","NVIDIA Jetson Orin Nano Developer Kit")

Chip Select pin — Pin connected to SPI peripheral device

SPI0_CS0 | SPI0_CS1 | SPI1_CS0 | SPI1_CS1 | SPI2_CS0 | SPI2_CS1 | SPI3_CS0 | SPI3_CS1

Pin connected to the SPI peripheral device. For TX2 boards, the default value is SPI3_CS0. For other boards, the default value is SPI0_CS0.

Dependencies

The available options depend on the Board parameter. This table shows the available interfaces for each board.

Board	SPI Interfaces
NVIDIA Jetson AGX Xavier Developer Kit	SPI0
NVIDIA Jetson TX2 Developer Kit	SPI3
NVIDIA Jetson Orin Nano Developer Kit	SPI0 and SPI1
NVIDIA Jetson Nano Developer Kit	SPI0 and SPI1
NVIDIA Jetson AGX Orin Developer Kit	SPI0 and SPI2
NVIDIA Jetson Xavier NX Developer Kit	SPI0 and SPI2

Mode (Clock polarity and phase) — Mode of SPI Communication

0 (default) | 1 | 2 | 3

Mode to use for SPI communication. This table shows the clock polarity and clock phase for each setting.

Mode	Clock Polarity	Clock Phase
0	0	0
1	0	1
2	1	0
3	1	1

Programmatic Use

To set the block parameter value programmatically, use the set_param (Simulink) function.

To get the block parameter value programmatically, use the get_param (Simulink) function.

Parameter:	ClockMode
Values:	"0" (default) | "1" | "2" | "3"

Example: set_param(gcb,"ClockMode","2")

Register address — SPI peripheral address to read from

0 (default) | scalar | vector

SPI peripheral address to read from. Each value of the register address must be a nonnegative integer less than or equal to 255.

Programmatic Use

To set the block parameter value programmatically, use the set_param (Simulink) function.

To get the block parameter value programmatically, use the get_param (Simulink) function.

Parameter:	RegisterAddress
Values:	"0" (default) | integer between 0 and 255 in quotes

Example: set_param(gcb,"RegisterAddress","[1 2]")

Output data type — Data type to output

int8 (default) | uint8 | int16 | uint16 | int32 | uint32 | single | double

Data type to output.

Programmatic Use

To set the block parameter value programmatically, use the set_param (Simulink) function.

To get the block parameter value programmatically, use the get_param (Simulink) function.

Parameter:	OutputDataType
Values:	"int8" (default) | "uint8" | "int16" | "uint16" | "int32" | "uint32" | "single" | "double"

Example: set_param(gcb,"OutputDataType","int16")

Output data length — Length of data to read

1 (default) | positive integer

Length of data to read.

Programmatic Use

To set the block parameter value programmatically, use the set_param (Simulink) function.

To get the block parameter value programmatically, use the get_param (Simulink) function.

Parameter:	OutputDataLength
Values:	"1" (default) | positive integer in quotes

Example: set_param(gcb,"OutputDataLength","2")

Sample Time — Sample time

-1 (default) | positive scalar

Sample time. The SPI Register Read block reads from the register at the rate specified by the Sample Time parameter. If Sample Time is -1, Simulink automatically chooses a sample time for the block.

Programmatic Use

To set the block parameter value programmatically, use the set_param (Simulink) function.

To get the block parameter value programmatically, use the get_param (Simulink) function.

Parameter:	SampleTime
Values:	"-1" (default) | scalar value in quotes

Example: set_param(gcb,"SampleTime","0.2")

Extended Capabilities

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

GPU Code Generation
Generate CUDA® code for NVIDIA® GPUs using GPU Coder™.

Version History

Introduced in R2026a