GPIO over SPI over GPIO - IO from Scratch - Part 5

I wanted to interface a different SPI device, this let’s us test connecting multiple devices at once but I also wanted to try out a different spi mode. In the future I want to interface to a complex mode 0 device so I went looking for a basic mode 0 device to experiment on. I found the MCP23S08 which is an 8 line IO expander. Since the GPIO lines are not being used for SPI this gives us some general purpose IO back!

0:00 Introduction 0:54 Checking the Datasheet 3:23 Current Circuit 4:12 Adding the new device 7:37 Coding Write 18:08 Coding Read 24:40 Outro ... https://www.youtube.com/watch?v=mGlDn7mb8_4