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Knowledge base » Software reference » SBI – Sandbox input from FPGA

SBI – Sandbox input from FPGA

By  Benoît Steinmann Updated on SD022

Table of Contents

The Sandbox Input from FPGA (SBI) block reads the value of the SBI registers in the FPGA.

It is used to transfer data from user-made code from within the FPGA to the CPU.

Information on FPGA edition is available on:

Usage examples of the SBI block are available on:

Simulink block

Signal specification

The output returns a vector of the 16-bit unsigned integers representing the SBI register values. Up to 8 registers can be read from a single SBI block. Multiple SBI blocks can be used to read more registers.

Parameters

  • Device ID selects which B-Box/B-Board to address when used in a multi-device configuration.
  • Starting register number and Number of registers defines the range of registers to read.

PLECS block

Signal specification

The output returns a vector of the 16-bit unsigned integers representing the SBI register values. Up to 8 registers can be read from a single SBI block. Multiple SBI blocks can be used to read more registers.

Parameters

  • Device ID selects which B-Box/B-Board to address when used in a multi-device configuration.
  • Starting register number and Number of registers defines the range of registers to read.

C++ functions

uint16_t Sbi_ReadDirectly(unsigned int address, unsigned int device=0);Code language: C++ (cpp)

Returns the SBI register value.

It can only be called in UserInit().

Parameters

  • address : address of the targeted register (0 to 63)
  • device : the id of the addressed device (optional, used in multi-device configuration only)
uint16_t Sbi_Read(unsigned int address, unsigned int device=0);Code language: C++ (cpp)

Returns the SBI register value, has to be called in the interrupt.

For this function to work the addressed register must be set as real-time using Sbi_ConfigureAsRealTime(), otherwise it returns 0.

Parameters

  • address : address of the targeted register (0 to 63)
  • device : the id of the addressed device (optional, used in multi-device configuration only)
void Sbi_ConfigureAsRealTime(unsigned int address, unsigned int device=0);Code language: C++ (cpp)

Tags an SBI register as real-time, meaning that its value is transferred before each interrupts and can then be retrieved using Sbi_Read().

It has to be called in UserInit().

Parameters

  • address : address of the targeted register (0 to 63)
  • device : the id of the addressed device (optional, used in multi-device configuration only)

Benoit is an embedded systems expert and the leader of software and firmware developments at imperix. On the knowledge base, he is the author of numerous software reference documents.

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