Multiple slave select lines on one SPI bus
willAlbertini707 opened this issue · 2 comments
I was reading through the rppal documentation and am wondering if a single Spi struct allows for multiple slave select pins. From what I can see there is only a single slave select line defined in new(). I cannot find a way to switch or change this value. Should I create a new Spi struct for each slave device? Any help would be appreciated, thanks!
Hey @willAlbertini707, apologies for the late reply. For SPI, RPPAL is just a wrapper for the underlying linux driver accessed through the available spidev character devices. Since each bus/slave select combo is accessed through a different spidev interface, you would have to create a new Spi struct for each slave device. I haven't actually experimented with this myself, but in theory that should work.
An alternative option would be to create an Spi struct for the SPI bus you want to use, and instead of using the pre-configured SS pins, use any other available GPIO pins for Slave Select and manually change those to high or low as needed.
I created a new Spi struct for each and it seemed to work, thanks!