This post seems to hint that there is an example file of how to use the cyusbserial.dll with .NET. However, unlike the i2c example I found I could not find a download link to the SPI one.C# .NET SPI Master examples (CYUSBS236).
Could someone please link this example?
Please find the attached project.
password for zip: cypress
If you face any issues with dll, please add the cyusbserial.dll to the project from the USB-Serial SDK.