/challenges-projects/design-challenges/smarter-life/b/blog/posts/a-very-compact-christmas-display---part-010SPI - DERs! players.brightcove.net/.../index.html Here is the result of driving two MCP23S17 16-bit GPIO drivers using a PSoC 4.The PSoC4 SPI Master component has a hardware driven SS (Slave Select) signal and it not always appropriate to use it.For then-USTelligent Community 12https://community.element14.com/challenges-projects/design-challenges/smarter-life/b/blog/posts/a-very-compact-christmas-display---part-010Mon, 11 Nov 2013 20:31:42 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:a2dcf3ec-967e-48a0-bc3d-de8ab89e76dbDAB1<p>Hi Monte,</p><p>&nbsp;</p><p>Have you measured the delay introduced by the MCP23S17 devices from the PSOC to the SPI device?</p><p>I wonder if the delay might add some timing issues with your display idea.</p><p>&nbsp;</p><p>DAB</p><p><br /> </p><img src="https://community.element14.com/aggbug?PostID=16300&AppID=105&AppType=Weblog&ContentType=0" width="1" height="1">