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Description
This example code demonstrates how to implement an SPI slave in FPGA that can accept variable length commands. In this particular example it accepts 3 commands: Slave ID, Memory Address to start reading, and number of addresses to read. This code was implemented on the 7833R, however the IP should work on most FPGA targets (some modification will be required). This code was tested using the NI-8451 as the SPI master and the 7833R as the SPI slave device.
Windows Block Diagram:
FPGA Block Diagram:
Application Notes:
LabVIEW 2010
LabVIEW FPGA 2010
NI RIO 3.5
Note 1: This example doesn't use the CS Line to determine communication between master and the selected slave device. CS functionality is implemented in the commands. This example also doesn't utilize CPOL and CPHA.
Note 2: FPGA needs to be compiled for your specific target.
Useful Links:
Implementing SPI Communication Protocol in LabVIEW FPGA
Understanding the SPI Bus with NI LabVIEW
Frequently Asked Questions: NI USB-8451 & SPI
Developing Digital Communication Interfaces with LabVIEW FPGA
Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.
